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1. Open data from the first and second observing runs of Advanced LIGO and Advanced Virgo

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Rich Abbott, Thomas D. Abbott, Sheelu Abraham, Fausto Acernese, Kendall Ackley, Carl Adams, Rana X. Adhikari, Vaishali B. Adya, Christoph Affeldt, Michalis Agathos, Kazuhiro Agatsuma, Nancy Aggarwal, Odylio D. Aguiar, Amit Aich, Lorenzo Aiello, Anirban Ain, Ajith Parameswaran, Gabrielle Allen, Annalisa Allocca, Paul A. Altin, Alex Amato, Shreya Anand, Alena Ananyeva, Stuart B. Anderson, Warren G. Anderson, Svetoslava V. Angelova, Stefano Ansoldi, Sarah Antier, Stephen Appert, Koji Arai, Melody C. Araya, Joseph S. Areeda, Marc Arène, Nicolas Arnaud, Scott M. Aronson, Kg G. Arun, Stefano Ascenzi, Gregory Ashton, Stuart M. Aston, Pia Astone, Florian Aubin, Peter Aufmuth, Kellie AultONeal, Corey Austin, Valerie Avendano, Stanislav Babak, Philippe Bacon, Francesca Badaracco, Maria K.M. Bader, Sangwook Bae, Anne M. Baer, Jonathon Baird, Francesca Baldaccini, Giulio Ballardin, Stefan W. Ballmer, Anna-marie Bals, Alexander Balsamo, Gregory Baltus, Sharan Banagiri, Deepak Bankar, Rameshwar S. Bankar, Juan C. Barayoga, Claudio Barbieri, Barry C. Barish, David Barker, Kevin Barkett, Pablo Barneo, Fabrizio Barone, Bryan Barr, Lisa Barsotti, Matteo Barsuglia, Daniel Barta, Jeffrey Bartlett, Imre Bartos, Riccardo Bassiri, Andrea Basti, Mateusz Bawaj, Joseph C. Bayley, Marco Bazzan, Bence Bécsy, Michal Bejger, Imene Belahcene, Angus S. Bell, Deeksha Beniwal, Michael G. Benjamin, Joe D. Bentley, Fabio Bergamin, Beverly K. Berger, Gerald Bergmann, Sebastiano Bernuzzi, Christopher P.L. Berry, Diego Bersanetti, Alessandro Bertolini, Joseph Betzwieser, Rohan Bhandare, Ankit V. Bhandari, Jeffrey Bidler, Edward Biggs, Igor A. Bilenko, Garilynn Billingsley, Ross Birney, Ofek Birnholtz, Sebastien Biscans, Matteo Bischi, Sylvia Biscoveanu, Aparna Bisht, Guldauren Bissenbayeva, Massimiliano Bitossi, Marieanne A. Bizouard, Kent K. Blackburn, Jonathan Blackman, Carl D. Blair, David G. Blair, Ryan M. Blair, Fabrizio Bobba, Nina Bode, Michel Boer, Yannick Boetzel, Gilles Bogaert, Francois Bondu, Edgard Bonilla, Romain Bonnand, Phillip Booker, Boris A. Boom, Rolf Bork, Valerio Boschi, Sukanta Bose, Vladimir Bossilkov, Joel Bosveld, Yann Bouffanais, Antonella Bozzi, Carlo Bradaschia, Patrick R. Brady, Alyssa Bramley, Marica Branchesi, Jim E. Brau, Matteo Breschi, Tristan Briant, Joseph H. Briggs, Francesco Brighenti, Alain Brillet, Marc Brinkmann, Patrick Brockill, Aidan F. Brooks, Jonathan Brooks, Daniel D. Brown, Sharon Brunett, Giacomo Bruno, Robert Bruntz, Aaron Buikema, Tomasz Bulik, Henk J. Bulten, Alessandra Buonanno, Damir Buskulic, Robert L. Byer, Miriam Cabero, Laura Cadonati, Giampietro Cagnoli, Craig Cahillane, Juan Calderón Bustillo, Jack D. Callaghan, Thomas A. Callister, Enrico Calloni, Jordan B. Camp, Maurizio Canepa, Kipp C. Cannon, Huy-tuong Cao, Junwei Cao, Giovanni Carapella, Franco Carbognani, Santiago Caride, Matthew F. Carney, Gregorio Carullo, Julia Casanueva Diaz, Claudio Casentini, Javier Castañeda, Sarah Caudill, Marco Cavaglià, Fabien Cavalier, Roberto Cavalieri, Giancarlo Cella, Pablo Cerdá-Durán, Elisabetta Cesarini, Oualid Chaibi, Kabir Chakravarti, Chiwai Chan, Manleong Chan, Shiuh Chao, Philip Charlton, Eve A. Chase, Eric Chassande-Mottin, Deep Chatterjee, Mayank Chaturvedi, Hsin-yu Y. Chen, Xu Chen, Yanbei Chen, Hai-ping Cheng, Chi-kit K. Cheong, Hanyu Y. Chia, Francesco Chiadini, Roberto Chierici, Andrea Chincarini, Antonino Chiummo, Gihyuk Cho, Heesuk S. Cho, Min-a Cho, Nelson Christensen, Qi Chu, Sheon Chua, Ka-wai W. Chung, Shinkee Chung, Giacomo Ciani, Pawel Ciecielag, Marek Cieślar, Alexei A. Ciobanu, Riccardo Ciolfi, Francesco Cipriano, Alessio Cirone, Filiberto Clara, James A. Clark, Patrick Clearwater, Sebastien Clesse, Frederic Cleva, Eugenio Coccia, Pierre-francois Cohadon, David Cohen, Marta Colleoni, Christophe G. Collette, Christopher Collins, Monica Colpi, Marcio Constancio Jr., Livia Conti, Sam J. Cooper, Paul Corban, Thomas R. Corbitt, Isabel Cordero-Carrión, Silvia Corezzi, Kenneth R. Corley, Neil Cornish, David Corre, Alessandra Corsi, Stefano Cortese, Cesar A. Costa, Roberto Cotesta, Michael W. Coughlin, Scott B. Coughlin, Jeanpierre Coulon, Stefan T. Countryman, Peter Couvares, Pep B. Covas, David M. Coward, Matthew J. Cowart, Dennis C. Coyne, Robert Coyne, Jolien D. E. Creighton, Teviet D. Creighton, Jonathan Cripe, Michael Croquette, Sgwynne G. Crowder, Jean-rene Cudell, Torrey J. Cullen, Alan Cumming, Rebecca Cummings, Liam Cunningham, Elena Cuoco, Malgorzata Curylo, Tito Dal Canton, Gergely Dálya, Aykutlu Dana, Lara M. Daneshgaran-Bajastani, Beatrice D’Angelo, Stefan L. Danilishin, Sabrina D’Antonio, Karsten Danzmann, Christian Darsow-Fromm, Arnab Dasgupta, Laurence E. H. Datrier, Vincenzo Dattilo, Ishant Dave, Michel Davier, Gareth S. Davies, Derek Davis, Edward J. Daw, Dan DeBra, Malathi Deenadayalan, Jerome Degallaix, Martina De Laurentis, Samuel Deléglise, Matthew Delfavero, Nicola De Lillo, Walter Del Pozzo, Lindsay M. DeMarchi, Virginia D’Emilio, Nicholas Demos, Thomas Dent, Roberto De Pietri, Rosario De Rosa, Camilla De Rossi, Riccardo DeSalvo, Omar de Varona, Sanjeev Dhurandhar, Mario C. Díaz, Mauricio Diaz-Ortiz Jr., Tim Dietrich, Luciano Di Fiore, Chiara Di Fronzo, Cinzia Di Giorgio, Fabrizio Di Giovanni, Matteo Di Giovanni, Tristano Di Girolamo, Alberto Di Lieto, Binlei Ding, Sibilla Di Pace, Irene Di Palma, Francesco Di Renzo, Atul K. Divakarla, Artemiy Dmitriev, Zoheyr Doctor, Fred Donovan, Katherine L. Dooley, Suresh Doravari, Iain Dorrington, Thomas P. Downes, Marco Drago, Jenne C. Driggers, Zhihui Du, Jean-gregoire Ducoin, Peter Dupej, Ofelia Durante, Domenico D’Urso, Sheila E. Dwyer, Paul J. Easter, Graeme Eddolls, Bruce Edelman, Tega B. Edo, Oliver Edy, Anamaria Effler, Phil Ehrens, Johannes Eichholz, Stephen S. Eikenberry, Marc Eisenmann, Robert A. Eisenstein, Aldo Ejlli, Lucianolucianikerrico Errico, Reed C. Essick, Hector Estelles, Dimitri Estevez, Zachariah B. Etienne, Todd Etzel, Matthew Evans, Tom M. Evans, Rebecca E. Ewing, Viviana Fafone, Stephen Fairhurst, Xilong Fan, Stefania Farinon, Benjamin Farr, Will M. Farr, Edward J. Fauchon-Jones, Marc Favata, Maxime Fays, Mariana Fazio, Jon Feicht, Martin M. Fejer, Fangchen Feng, Edit Fenyvesi, Deborah L. Ferguson, Alvaro Fernandez-Galiana, Isidoro Ferrante, Elvis C. Ferreira, Tabata A. Ferreira, Francesco Fidecaro, Irene Fiori, Donatella Fiorucci, Maya Fishbach, Ryan P. Fisher, Rosalba Fittipaldi, Margot Fitz-Axen, Vincenzo Fiumara, Raffaele Flaminio, Erik Floden, Eric Flynn, Heather Fong, Antonio A. Font, Perry Forsyth, Jean-daniel Fournier, Sergio Frasca, Franco Frasconi, Zsolt Frei, Andreas Freise, Raymond Frey, Valentin Frey, Peter Fritschel, Valery V. Frolov, Gabriele Fronzè, Paul Fulda, Michael Fyffe, Hunter A. Gabbard, Bhooshan U. Gadre, Sebastian M. Gaebel, Jonathan R. Gair, Shanika Galaudage, Dhruva Ganapathy, Sharad G. Gaonkar, Cecilio García-Quirós, Fabio Garufi, Bubba Gateley, Sergio Gaudio, Gayathri Gayathri, Gianluca Gemme, Eric Genin, Alberto Gennai, Daniel George, Jogy George, Laszlo Gergely, Sudarshan Ghonge, Abhirup Ghosh, Archisman Ghosh, Shaon Ghosh, Bruno Giacomazzo, Joe A. Giaime, Dwayne D. Giardina, Des R. Gibson, Chalisa Gier, Kiranjyot Gill, Jane Glanzer, Jan Gniesmer, Patrick Godwin, Evan Goetz, Ryan Goetz, Niklas Gohlke, Boris Goncharov, Gabriela González, Gopakumar Gopakumar, Sarah E. Gossan, Matthieu Gosselin, Romain Gouaty, Benjamin Grace, Aniello Grado, Massimo Granata, Alastair Grant, Slawomir Gras, Philippe Grassia, Corey Gray, Rachel Gray, Giuseppe Greco, Anna C. Green, Rhys Green, Elizabeth M. Gretarsson, Hannah L. Griggs, G. Grignani, Andrea Grimaldi, Stefan J. Grimm, Hartmut Grote, Steffen Grunewald, Pierre Gruning, Gianluca M. Guidi, Andre R. Guimaraes, Gerard Guixé, Hitesh K. Gulati, Yuefan Guo, Anuradha Gupta, Anchal Gupta, Pawan Gupta, Eric K. Gustafson, Dick Gustafson, Leila Haegel, Odysse Halim, Evan D. Hall, Eleanor Z. Hamilton, Giles Hammond, Maria Haney, Manuela M. Hanke, Jonathan Hanks, Chad Hanna, Mark D. Hannam, Otto A. Hannuksela, Travis J. Hansen, Joe Hanson, Thomas Harder, Terra Hardwick, Haris Haris, Jan Harms, Gregg M. Harry, Ian W. Harry, Raine K. Hasskew, Carl-johan Haster, Karen Haughian, Fergus J. Hayes, James Healy, Antoine Heidmann, Matthew C. Heintze, Joscha Heinze, Henrich Heitmann, Frances Hellman, Patrice Hello, Gary Hemming, Martin Hendry, Siong S. Heng, Eric Hennes, Jan-simon Hennig, Michele Heurs, Stefan Hild, Tanja Hinderer, Sarah Y. Hoback, Sven Hochheim, Elyssa Hofgard, David Hofman, Aaron M. Holgado, Nathan A. Holland, Kathy Holt, Daniel E. Holz, Paul Hopkins, Christian Horst, James Hough, Eric J. Howell, Charlie G. Hoy, Yiwen Huang, Moritz T. Hübner, Eliu A. Huerta, Dominique Huet, Brennan Hughey, Victor Hui, Sascha Husa, Sabina H. Huttner, Rachael Huxford, Tien Huynh-Dinh, Bartosz Idzkowski, Alberto Iess, Henri Inchauspe, Craig Ingram, Giuseppe Intini, Jean M. Isac, Max Isi, Bala R. Iyer, Thibaut Jacqmin, Sameer J. Jadhav, Shreejit P. Jadhav, Alasdair L. James, Karan Jani, Nagaraj N. Janthalur, Piotr Jaranowski, Deep Jariwala, Rafel Jaume, Alex C. Jenkins, Jun Jiang, Grace R. Johns, Aaron W. Jones, Ian I. Jones, Jeff D. Jones, Philip Jones, Russell Jones, Reinier J. G. Jonker, Ju Ju, Jonas Junker, Chinmay V. Kalaghatgi, Vassiliki Kalogera, Brittany Kamai, Shivaraj Kandhasamy, Gungwon Kang, Jonah B. Kanner, Shasvath J. Kapadia, Sudarshan Karki, Rahul Kashyap, Marie Kasprzack, Wolfgang Kastaun, Stavros Katsanevas, Erik Katsavounidis, William Katzman, Steffen Kaufer, Keita Kawabe, Fabien Kéfélian, David Keitel, Azadeh Keivani, Ross Kennedy, Joey S. Key, Sudiksha Khadka, Farit Y. Khalili, Imran Khan, Sebastian Khan, Zaki A. Khan, Efim A. Khazanov, Nandita Khetan, Mohammad Khursheed, Nutsinee Kijbunchoo, Chunglee Kim, Grace J. Kim, Jeongcho C. Kim, Kyungmin Kim, Won Kim, Whansun S. Kim, Young-min Kim, Charles Kimball, Peter J. King, Maya Kinley-Hanlon, Robin Kirchhoff, Jeffrey S. Kissel, Lisa Kleybolte, Sergei Klimenko, Tyler D. Knowles, Philip Koch, Sina M. Koehlenbeck, Gideon Koekoek, Soumen Koley, Veronica Kondrashov, Antonios Kontos, Nico Koper, Mikhail Korobko, William Z. Korth, Manoj Kovalam, Dan B. Kozak, Volker Kringel, Nv V. Krishnendu, Andrzej Królak, Natalie Krupinski, Gerrit Kuehn, Anil Kumar, Prayush Kumar, Rahul Kumar, Rakesh Kumar, Sumit Kumar, Ling-chi Kuo, Adam Kutynia, Benjamin D. Lackey, Danny Laghi, Emile Lalande, Lam L. Lam, Astrid Lamberts, Michael Landry, Benjamin B. Lane, Ryan N. Lang, Jacob Lange, Brian Lantz, Robert K. Lanza, Iuri La Rosa, Angelique Lartaux-Vollard, Paul D. Lasky, Michael Laxen, Albert Lazzarini, Claudia Lazzaro, Paola Leaci, Sean Leavey, Yannick K. Lecoeuche, Chang-hwan H. Lee, Hyung-mok M. Lee, Hyungwon W. Lee, Joongoo Lee, Kyung-ha Lee, Johannes Lehmann, Nicolas Leroy, Nicolas Letendre, Yuri Levin, Alvin K. Y. Li, Jin Li, Kaye li, Tjonnie G. F. Li, Xiang Li, Frank Linde, Seth D. Linker, Jethro N. Linley, Tyson B. Littenberg, Liu Liu, Xiaoshu Liu, Miquel Llorens-Monteagudo, Ka-lok Lo, Alexandra Lockwood, Lionel T. London, Alessandro Longo, Matteo Lorenzini, Vincent Loriette, Marc Lormand, Giovanni Losurdo, James D. Lough, Carlos O. Lousto, Geoffrey Lovelace, Harald Lück, Diana Lumaca, Andrew P. Lundgren, Ma Yiqiu, Ronaldas Macas, Sean Macfoy, Myron MacInnis, Duncan M. Macleod, Ian O. MacMillan, Adrian Macquet, Ignacio Magaña Hernandez, Fabian Magaña-Sandoval, Ryan M. Magee, Ettore Majorana, Ivan Maksimovic, Asmita Malik, Catherine Man, Vuk Mandic, Valentina Mangano, Georgia L. Mansell, Michael Manske, Maddalena Mantovani, Michela Mapelli, Fabio Marchesoni, Frederique Marion, Szabolcs Márka, Zsuzsanna Márka, Charalampos Markakis, Ashot S. Markosyan, Aaron Markowitz, Ed Maros, Antonio Marquina, Sylvain Marsat, Filippo Martelli, Ian W. Martin, Rodica M. Martin, Valerie Martinez, Denis V. Martynov, Hossein Masalehdan, Ken Mason, Elena Massera, Alain Masserot, Thomas J. Massinger, Mariela Masso-Reid, Simone Mastrogiovanni, Andrew Matas, Fabrice Matichard, Nergis Mavalvala, Emily Maynard, Joshua J. McCann, Richard McCarthy, David E. McClelland, Scott McCormick, Lee McCuller, Stephen C. McGuire, Connor McIsaac, Jessica McIver, David J. McManus, Terry McRae, Sean T. McWilliams, Duncan Meacher, Grant D. Meadors, Moritz Mehmet, Ajit K. Mehta, Elena Mejuto Villa, Andrew Melatos, Gregory Mendell, Adam A. Mercer, Lorenzo Mereni, Kara Merfeld, Edmond L. Merilh, Jonathan D. Merritt, Mourad Merzougui, Syd Meshkov, Chris Messenger, Cody Messick, Remi Metzdorff, Patrick M. Meyers, Fabian Meylahn, Ashish Mhaske, Andrea Miani, Haixing Miao, Ioannis Michaloliakos, Christophe Michel, Hannah Middleton, Leopoldo Milano, Andrewlawrence L. Miller, Meg Millhouse, Joseph C. Mills, Edoardo Milotti, Michael C. Milovich-Goff, Olivier Minazzoli, Yuri Minenkov, Alec Mishkin, Chandra Mishra, Timesh Mistry, Sanjit Mitra, Valery P. Mitrofanov, Guenakh Mitselmakher, Richard Mittleman, Geoffrey Mo, Kentaro Mogushi, Satyanarayan R. P. Mohapatra, Siddharth R. Mohite, Manel Molina-Ruiz, Marina Mondin, Matteo Montani, Christopher J. Moore, Dan Moraru, Filip Morawski, Gerardo Moreno, Soichiro Morisaki, Benoit Mours, Conor M. Mow-Lowry, Simone Mozzon, Federico Muciaccia, Arunava Mukherjee, Debnandini Mukherjee, Soma Mukherjee, Subroto Mukherjee, Nikhil Mukund, Adam Mullavey, Jesper Munch, Erik A. Muñiz, Peter G. Murray, Alessandro Nagar, Ilaria Nardecchia, Luca Naticchioni, Rajesh K. Nayak, Benjamin F. Neil, Joshua Neilson, Gijs Nelemans, Timothy J. N. Nelson, Marina Nery, Ansel Neunzert, Kwan-yeung Y. Ng, Sebastian Ng, Catherine Nguyen, Philippe Nguyen, David Nichols, Shania A. Nichols, Samaya Nissanke, Flavio Nocera, Minkyun Noh, Chris North, Devon Nothard, Laura K. Nuttall, Jason Oberling, Brendan D. O’Brien, Gor Oganesyan, Greg H. Ogin, John J. Oh, Sanghoon H. Oh, Frank Ohme, Hiroaki Ohta, Marcos A. Okada, Miquel Oliver, Christian Olivetto, Patrick Oppermann, Richard Oram, Brian O’Reilly, Rich G. Ormiston, Luis F. Ortega, Richard O’Shaughnessy, Serguei Ossokine, Charles Osthelder, David J. Ottaway, Harry Overmier, Ben J. Owen, Alexander E. Pace, Giulia Pagano, Michael A. Page, Giulia Pagliaroli, Archana Pai, Siddhesh A. Pai, Jordan R. Palamos, Oleg Palashov, Cristiano Palomba, Howard Pan, Pratap K. Panda, Tsun-ho Pang, Chris Pankow, Francesco Pannarale, Brijesh C. Pant, Federico Paoletti, Andrea Paoli, Abhishek Parida, William Parker, Daniela Pascucci, Antonio Pasqualetti, Roberto Passaquieti, Diego Passuello, Barbara Patricelli, Ethan Payne, Brynley L. Pearlstone, Thida C. Pechsiri, Ari J. Pedersen, Mike Pedraza, Arnaud Pele, Steven Penn, Albino Perego, Carlos J. Perez, Perigois Périgois, Antonio Perreca, Stephane Perriès, Jan Petermann, Harald P. Pfeiffer, Margot Phelps, Khun S. Phukon, Ornella J. Piccinni, Mikhael Pichot, Marco Piendibene, Francesco Piergiovanni, Vincenzo Pierro, Gabriel Pillant, Laurent Pinard, Innocenzo M. Pinto, Krzysztof Piotrzkowski, Marc Pirello, Matthew Pitkin, Wolfango Plastino, Rosa Poggiani, Yat-tung T. Pong, Sarah Ponrathnam, Pasquale Popolizio, Ed K. Porter, Jade Powell, Atul K. Prajapati, Kiran Prasai, Raghurama Prasanna, Geraint Pratten, Tanner Prestegard, Maria Principe, Giovanni A. Prodi, Leonid Prokhorov, Michele Punturo, Paola Puppo, Michael Pürrer, Hong Qi, Volker Quetschke, Pedro J. Quinonez, Fred J. Raab, Geert Raaijmakers, Hugh Radkins, Nicholas Radulesco, Peter Raffai, Hanna Rafferty, Sendhil Raja, Rajan Rajan, Binod Rajbhandari, Malik Rakhmanov, Karla E. Ramirez, Antoni Ramos-Buades, Javed Rana, Kaushik Rao, Piero Rapagnani, Vivien Raymond, Massimiliano Razzano, Jocelyn Read, Tania Regimbau, Luca Rei, Stuart Reid, David H. Reitze, Piero Rettegno, Fulvio Ricci, Colter J. Richardson, Jonathan W. Richardson, Paul M. Ricker, Gunnar Riemenschneider, Keith Riles, Monica Rizzo, Norna A. Robertson, Florent Robinet, Alessio Rocchi, Ramon D. Rodriguez-Soto, Loic Rolland, Jameson G. Rollins, Vincent J. Roma, Marco Romanelli, Rocco Romano, Chandra L. Romel, Isobel M. Romero-Shaw, Janeen H. Romie, Caitlin A. Rose, Dakota Rose, Kyle Rose, Dorota Rosińska, Shawn G. Rosofsky, Michael P. Ross, Sheila Rowan, Samuel J. Rowlinson, Palash K. Roy, Santosh Roy, Soumen Roy, Paolo Ruggi, Guntis Rutins, Kyle Ryan, Surabhi Sachdev, Travis Sadecki, Mairi Sakellariadou, Om S. Salafia, Livio Salconi, Muhammed Saleem, Anuradha Samajdar, Eduardo J. Sanchez, Luis E. Sanchez, Nicolas Sanchis-Gual, Jaclyn R. Sanders, Kevin A. Santiago, Edison Santos, Nikhil Sarin, Benoit Sassolas, B S. Sathyaprakash, Orion Sauter, Richard L. Savage, Vaibhav Savant, Disha Sawant, Sihem Sayah, Dean Schaetzl, Paul Schale, Mark Scheel, Jacob Scheuer, Patricia Schmidt, Roman Schnabel, Robert M. S. Schofield, Axel Schönbeck, Emil Schreiber, Bernd W. Schulte, Bernard F. Schutz, Otto Schwarm, Eyal Schwartz, Jamie Scott, Susan M. Scott, Ed Seidel, Danny Sellers, Anand S. Sengupta, Noah Sennett, Daniel Sentenac, Valeria Sequino, Alexander Sergeev, Yoshinta Setyawati, Daniel A. Shaddock, Thomas Shaffer, Selim S. Shahriar, A. Sharma, Priyanka Sharma, Peter Shawhan, Hongyu Shen, Minori Shikauchi, Rosalie Shink, David H. Shoemaker, Deirdre M. Shoemaker, Keerti Shukla, Shyamsundar ShyamSundar, Karelle Siellez, Magdalena Sieniawska, Daniel Sigg, Leo P. Singer, Divya Singh, Neha Singh, Ayatri Singha, Akshat Singhal, Alicia M. Sintes, Valeria Sipala, Vasileios Skliris, Bram J. J. Slagmolen, Teresa J. Slaven-Blair, Jiri Smetana, Joshua R. Smith, Rory J. E. Smith, Surendranadh Somala, Edwin J. Son, Siddharth Soni, Borja Sorazu, Viola Sordini, Fiodor Sorrentino, Tarun Souradeep, Eric Sowell, Andrew P. Spencer, Mario Spera, Amit K. Srivastava, Varun Srivastava, Kai Staats, Cosmin Stachie, Mark Standke, Daniele A. Steer, Michael Steinke, Jessica Steinlechner, Sebastian Steinlechner, Daniel Steinmeyer, Dane Stocks, David J. Stops, Madeline Stover, Ken A. Strain, Giulia Stratta, Amber Strunk, Riccardo Sturani, Amber L. Stuver, Sudhagar Sudhagar, Vivishek Sudhir, Tiffany Z. Summerscales, Ling Sun, Sunil Sunil, Ankan Sur, Jishnu Suresh, Patrick J. Sutton, Bas L. Swinkels, Marek J. Szczepańczyk, Matteo Tacca, Simon C. Tait, Colm Talbot, Andres J. Tanasijczuk, David B. Tanner, Duo Tao, Marton Tápai, Amauri Tapia, Enzo N. Tapia San Martin, Jay D. Tasson, Robert Taylor, Rodrigo Tenorio, Lukas Terkowski, Manasadevi P. Thirugnanasambandam, Michael Thomas, Patrick Thomas, Jonathan E. Thompson, Sivananda R. Thondapu, Keith A. Thorne, Eric Thrane, Calley L. Tinsman, Saravanan R. Saravanan, Shubhanshu Tiwari, Srishti Tiwari, Vaibhav Tiwari, Karl Toland, Mauro Tonelli, Zeno Tornasi, Alejandro Torres-Forné, Calum I. Torrie, Iara Tosta e Melo, Daniel Töyrä, Emily A. Trail, Flavio Travasso, Gary Traylor, Maria C. Tringali, Aashish Tripathee, Agata Trovato, Randy J. Trudeau, Ka-wa W. Tsang, Maggie Tse, Rhondale Tso, Leo Tsukada, Daichi Tsuna, Takuya Tsutsui, Margherita Turconi, Amit S. Ubhi, Koh Ueno, Dennis Ugolini, Cs S. Unnikrishnan, Alexander L. Urban, Samantha A. Usman, Andrei C. Utina, Henning Vahlbruch, Gabriele Vajente, Guillermo Valdes, Michele Valentini, M. Vallisneri, Niels van Bakel, Martin van Beuzekom, Jo F. J. van den Brand, Chris Van Den Broeck, Daniel C. Vander-Hyde, Laura van der Schaaf, Joris V. Van Heijningen, Marielle A. van Veggel, Marco Vardaro, Vijay Varma, Steve Vass, Matyas Vasúth, Alberto Vecchio, Gabriele Vedovato, John Veitch, Peter J. Veitch, Krishna Venkateswara, Gautam Venugopalan, Didier Verkindt, Doga Veske, Flavio Vetrano, Andrea Viceré, Aaron D. Viets, Serena Vinciguerra, David J. Vine, Jeanyves Vinet, Salvatore Vitale, Francisco Hernandez Vivanco, Thomas Vo, Helios Vocca, Cheryl Vorvick, Sergey P. Vyatchanin, Andrew R. Wade, Leslie E. Wade, Madeline Wade, Rob Walet, Marissa Walker, Gavin S. Wallace, Larry Wallace, Sinead Walsh, Jonathan Z. Wang, Sibo Wang, Wenhui H. Wang, Yifan F. Wang, Robert L. Ward, Zane A. Warden, Jim Warner, Michal Was, Jennifer Watchi, Betsy Weaver, Li-wei Wei, Michael Weinert, Alan J. Weinstein, Rainer Weiss, Felix Wellmann, Linqing Wen, Peter Weßels, Jonathan W. Westhouse, Karl Wette, John T. Whelan, Bernard F. Whiting, Chris Whittle, Dennis M. Wilken, Daniel Williams, Roy D. Williams, Andrew R. Williamson, Joshua L. Willis, Benno Willke, Walter Winkler, Christopher C. Wipf, Holger Wittel, Graham Woan, Janis Woehler, Jared K. Wofford, Chun-fung Wong, Jennifer L. Wright, David S. Wu, Daniel M. Wysocki, Liting Xiao, Hiro Yamamoto, Le Yang, Yang Yang, Ziyan Yang, Min-jet J. Yap, Maher Yazback, David W. Yeeles, Hang Yu, Haocun Yu, Shingheirobin Yuen, Adam K. Zadrożny, Adam Zadrożny, Michele Zanolin, Tatiana Zelenova, Jean-pierre Zendri, Michael Zevin, Jue Zhang, Liyuan Zhang, Teng Zhang, Chunnong Zhao, Guoying Zhao, Minchuan Zhou, Zifan Zhou, Xingjiang J. Zhu, Aaron B. Zimmerman, Michael E. Zucker, and John Zweizig

Subjects
GWOSC, Scientific databases, Data representation and management, Gravitational Waves, Computer software, QA76.75-76.765
Abstract

Advanced LIGO and Advanced Virgo are monitoring the sky and collecting gravitational-wave strain data with sufficient sensitivity to detect signals routinely. In this paper we describe the data recorded by these instruments during their first and second observing runs. The main data products are gravitational-wave strain time series sampled at 16384 Hz. The datasets that include this strain measurement can be freely accessed through the Gravitational Wave Open Science Center at http://gw-openscience.org, together with data-quality information essential for the analysis of LIGO and Virgo data, documentation, tutorials, and supporting software.

Published
2021
Full Text
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2. Analysis of the accuracy of actuation electronics in the laser interferometer space antenna pathfinder

Author

N. Korsakova, Heather Audley, Gerhard Heinzel, Lluis Gesa, R. Maarschalkerweerd, Daniele Vetrugno, N. Cardines, S. Vitale, J. ten Pierick, Michele Armano, F. Martin-Porqueras, S. Paczkowski, B. Kaune, E. Castelli, José F. F. Mendes, M. Freschi, M. Hueller, N. Meshksar, J. Reiche, Luigi Ferraioli, P. Pivato, Rita Dolesi, Tamara Sumner, Nikolaos Karnesis, Peter Wass, A. M. Cruise, Ph. Jetzer, M. de Deus Silva, Antonella Cavalleri, J. Baird, E. D. Fitzsimons, Antoine Petiteau, Henri Inchauspe, J. P. López-Zaragoza, M.-S. Hartig, Paul McNamara, Ferran Gibert, Michael Perreur-Lloyd, I. Mateos, Oliver Jennrich, J. Martino, Carlos F. Sopuerta, Martin Hewitson, Karsten Danzmann, Daniel Hollington, W. J. Weber, Catia Grimani, L. Wissel, J. Grzymisch, H. Ward, Daniele Bortoluzzi, L. Mendes, F. Rivas, Miquel Nofrarías, Gudrun Wanner, Juan Ramos-Castro, Eric Plagnol, V. Martín, Domenico Giardini, A. Wittchen, R. Giusteri, M. Born, James Ira Thorpe, Christian J. Killow, D. I. Robertson, A. Cesarini, G. Russano, G. Dixon, Peter Zweifel, Davor Mance, D. Texier, Jacob Slutsky, Valerio Ferroni, D. Hoyland, L. Martin-Polo, I. Harrison, Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, European Space Agency, Centre National de la Recherche Scientifique (France), Université Paris Diderot, Sorbonne Université, Agenzia Spaziale Italiana, Istituto Nazionale di Fisica Nucleare, Ministerio de Economía y Competitividad (España), Ministerio de Ciencia, Innovación y Universidades (España), Generalitat de Catalunya, Agencia Estatal de Investigación (España), Fundación General CSIC, Swiss National Science Foundation, Swiss Space Office, UK Space Agency, National Aeronautics and Space Administration (US), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Observatoire de la Côte d'Azur (OCA), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
Signal processing, Acoustics, Electrical properties and parameters, Analog-to-digital converter, Residual, 01 natural sciences, 010305 fluids & plasmas, law.invention, Electromagnetic radiation detectors, Computer Science::Robotics, Acceleration, law, Electrostatics, 0103 physical sciences, Waveform, Control equipment, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation, 010302 applied physics, Physics, Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Antenes i agrupacions d'antenes [Àrees temàtiques de la UPC], Spacecraft, business.industry, Field programmable gate array, Spacecrafts, Tractament del senyal, Enginyeria de la telecomunicació::Processament del senyal [Àrees temàtiques de la UPC], Control system, Gravitational force, Antennas (Electronics), Antenes (Electrònica), business, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Voltage
Abstract

M. Armano et al., The Laser Interferometer Space Antenna Pathfinder (LPF) main observable, labeled Δg, is the differential force per unit mass acting on the two test masses under free fall conditions after the contribution of all non-gravitational forces has been compensated. At low frequencies, the differential force is compensated by an applied electrostatic actuation force, which then must be subtracted from the measured acceleration to obtain Δg. Any inaccuracy in the actuation force contaminates the residual acceleration. This study investigates the accuracy of the electrostatic actuation system and its impact on the LPF main observable. It is shown that the inaccuracy is mainly caused by the rounding errors in the waveform processing and also by the random error caused by the analog to digital converter random noise in the control loop. Both errors are one order of magnitude smaller than the resolution of the commanded voltages. We developed a simulator based on the LPF design to compute the close-to-reality actuation voltages and, consequently, the resulting actuation forces. The simulator is applied during post-processing the LPF data., This work was supported by ETH Research Grant No. ETH-05 16-2, and it has been made possible by the LISA Pathfinder mission, which is part of the space-science program of the European Space Agency. The French contribution has been supported by the CNES (Accord Specific de Projet Grant No. CNES 1316634/CNRS 103747), the CNRS, the Observatoire de Paris, and University Paris-Diderot. E. Plagnol and H. Inchauspé would also like to acknowledge the financial support of the UnivEarthS Labex program at Sorbonne Paris Cité (Grant Nos. ANR-10-LABX-0023 and ANR-11-IDEX-0005-02). The Albert-Einstein-Institut acknowledges the support of the German Space Agency, DLR. The work is supported by the Federal Ministry for Economic Affairs and Energy based on a resolution of the German Bundestag (Grant Nos. FKZ 50OQ0501 and FKZ 50OQ1601). The Italian contribution has been supported by the Agenzia Spaziale Italiana and the Istituto Nazionale di Fisica Nucleare. The Spanish contribution has been supported by Contract Nos. AYA2010-15709 (MICINN), ESP2013-47637-P, ESP2015-67234-P, and ESP2017-90084-P (MINECO). Support from AGAUR (Generalitat de Catalunya) contract 2017-SGR-1469 is also acknowledged. M. Nofrarias acknowledges support from Fundacion General CSIC (Programa ComFuturo). F. Rivas acknowledges an FPI contract from MINECO. The Swiss contribution acknowledges the support of the Swiss Space Office (SSO) via the PRODEX Programme of the ESA. L. Ferraioli is supported by the Swiss National Science Foundation. The UK groups wish to acknowledge support from the United Kingdom Space Agency (UKSA), the University of Glasgow, the University of Birmingham, Imperial College, and the Scottish Universities Physics Alliance (SUPA). J. I. Thorpe and J. Slutsky acknowledge the support of the U.S. National Aeronautics and Space Administration (NASA). N. Korsakova would like to thank the support from the CNES Fellowship. The LISA Pathfinder collaboration would like to acknowledge Professor Pierre Binetruy (deceased 30 March 2017) and Professor José Alberto Lobo (deceased 30 September 2012) for their contribution to the LISA Pathfinder science.

Published
2020

3. LISA Pathfinder platform stability and drag-free performance

Author

N. Korsakova, Gerhard Heinzel, Michele Armano, Ian Harrison, M. Freschi, Henri Inchauspe, R. Giusteri, Ph. Jetzer, M. de Deus Silva, Domenico Giardini, J. P. López-Zaragoza, Rita Dolesi, J. Baird, J. Grzymisch, H. Ward, W. J. Weber, Ferran Gibert, F. Martin-Porqueras, Daniele Vetrugno, E. D. Fitzsimons, F. Rivas, Peter Wass, S. Paczkowski, Jacob Slutsky, L. Martin-Polo, Valerio Ferroni, Luigi Ferraioli, D. Hoyland, L. Wissel, P. Zweifel, James Ira Thorpe, Oliver Jennrich, Antonella Cavalleri, Gudrun Wanner, M. Hueller, N. Meshksar, L. Mendes, P. Pivato, Juan Ramos-Castro, Karsten Danzmann, Davor Mance, J. Martino, A. M. Cruise, D. Bortoluzzi, Nikolaos Karnesis, Michael Perreur-Lloyd, Miquel Nofrarías, José F. F. Mendes, Antoine Petiteau, D. Texier, Paul McNamara, M. Born, M. Hewitson, Carlos F. Sopuerta, Lluis Gesa, B. Kaune, Ingo Diepholz, R. Maarschalkerweerd, A. Wittchen, Eric Plagnol, Víctor S. Martín, Catia Grimani, Ivan Lloro, J. Reiche, A. Cesarini, G. Russano, D. I. Robertson, Daniel Hollington, S. Vitale, T. J. Sumner, L. Liu, E. Castelli, J. A. Lobo, Christian J. Killow, G. Dixon, Pierre Binétruy, Heather Audley, Ignacio Mateos, LISA Pathfinder Collaboration, Science and Technology Facilities Council (STFC), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), LISA Pathfinder, Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
Astrofísica, noise, Gravitational-wave observatory, Geodesic, FOS: Physical sciences, Astronomy & Astrophysics, Astrophysics, 01 natural sciences, Noise (electronics), Star tracker, Gravitational waves, Physics, Particles & Fields, Attitude control, cosmic rays, 0103 physical sciences, Experiments in gravity, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Aerospace engineering, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Physics, LISA, Science & Technology, Spacecraft, 010308 nuclear & particles physics, Gravitational wave, business.industry, stability, Pathfinder, Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], Physical Sciences, business, Astrophysics - Instrumentation and Methods for Astrophysics, cosmology, geodesic, performance
Abstract

The science operations of the LISA Pathfinder mission has demonstrated the feasibility of sub-femto-g free-fall of macroscopic test masses necessary to build a LISA-like gravitational wave observatory in space. While the main focus of interest, i.e. the optical axis or the $x$-axis, has been extensively studied, it is also of interest to evaluate the stability of the spacecraft with respect to all the other degrees of freedom. The current paper is dedicated to such a study, with a focus set on an exhaustive and quantitative evaluation of the imperfections and dynamical effects that impact the stability with respect to its local geodesic. A model of the complete closed-loop system provides a comprehensive understanding of each part of the in-loop coordinates spectra. As will be presented, this model gives very good agreements with LISA Pathfinder flight data. It allows one to identify the physical noise source at the origin and the physical phenomena underlying the couplings. From this, the performances of the stability of the spacecraft, with respect to its geodesic, are extracted as a function of frequency. Close to $1 mHz$, the stability of the spacecraft on the $X_{SC}$, $Y_{SC}$ and $Z_{SC}$ degrees of freedom is shown to be of the order of $5.0\ 10^{-15} m\ s^{-2}/\sqrt{Hz}$ for X and $4.0 \ 10^{-14} m\ s^{-2}/\sqrt{Hz}$ for Y and Z. For the angular degrees of freedom, the values are of the order $3\ 10^{-12} rad\ s^{-2}/\sqrt{Hz}$ for $\Theta_{SC}$ and $3\ 10^{-13} rad\ s^{-2}/\sqrt{Hz}$ for $H_{SC}$ and $\Phi_{SC}$., Comment: 16 pages, 10 figures

Published
2019

4. Forbush decreases and <2 day GCR flux non-recurrent variations studied with LISA pathfinder

Author

N. Korsakova, Jacob Slutsky, Valerio Ferroni, D. Hoyland, Ian Harrison, Henri Inchauspe, Monica Laurenza, J. Grzymisch, Davor Mance, Ph. Jetzer, H. Ward, E. D. Fitzsimons, D. Texier, R. Giusteri, W. J. Weber, Gerhard Heinzel, Antoine Petiteau, Paul McNamara, Ignacio Mateos, Lluis Gesa, Ivan Lloro, Carlos F. Sopuerta, Rita Dolesi, D. I. Robertson, Martin Hewitson, Domenico Giardini, Daniel Hollington, J. Martino, J. P. López-Zaragoza, B. Kaune, M. Hueller, Daniele Vetrugno, J. A. Lobo, Michael Perreur-Lloyd, Ferran Gibert, R. Maarschalkerweerd, M. Born, Víctor S. Martín, L. Martin-Polo, James Ira Thorpe, P. Pivato, Luigi Ferraioli, A. Wittchen, Stefano Vitale, F. Rivas, M. Fabi, Gudrun Wanner, Juan Ramos-Castro, José F. F. Mendes, A. Cesarini, G. Russano, Heather Audley, Peter Wass, Eric Plagnol, Ingo Diepholz, N. Finetti, Karsten Danzmann, Pierre Binétruy, L. Wissel, Antonella Cavalleri, Peter Zweifel, Daniele Bortoluzzi, L. Mendes, J. Reiche, Miquel Nofrarías, J. Baird, Michele Armano, M. Freschi, S. Paczkowski, A. M. Cruise, N. Karnesis, Simone Benella, Mattia Villani, F. Martin-Porqueras, N. Meshksar, Daniele Telloni, Oliver Jennrich, Karel Kudela, T. J. Sumner, L. Liu, E. Castelli, M. de Deus Silva, Catia Grimani, Christian J. Killow, G. Dixon, Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
Ciències de la visió::Òptica física [Àrees temàtiques de la UPC], PARTICLE-ACCELERATION, solar–terrestrial relations, 010504 meteorology & atmospheric sciences, Energies::Energia solar fotovoltaica [Àrees temàtiques de la UPC], Flux, Astrophysics, Photovoltaic power generation, 01 natural sciences, 0305 Organic Chemistry, Heliosphere, Physics - Space Physics, Interferòmetres, instrumentation: interferometers, 010303 astronomy & astrophysics, Solar–terrestrial relations, Energia solar fotovoltaica, Physics, 0306 Physical Chemistry (incl. Structural), COROTATING INTERACTION REGIONS, heliosphere [Sun], Sun, solar-terrestrial relations, interferometers, interplanetary medium, Sun: heliosphere [cosmic rays, instrumentation], COSMIC-RAY PROTON, Astrophysics - Solar and Stellar Astrophysics, SOLAR-WIND, Physical Sciences, Lagrangian point, Astronomy & Astrophysics, Interferometers [Instrumentation], cosmic rays, 0103 physical sciences, 0201 Astronomical and Space Sciences, MODULATION, FIELD, Sun: heliosphere, Cosmic rays, 0105 earth and related environmental sciences, Geomagnetic storm, SPECTRUM, Science & Technology, Interferometers, Astronomy and Astrophysics, Plasma, Pathfinder, 13. Climate action, Space and Planetary Science, Heliospheric current sheet, Interplanetary spaceflight, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Intensity (heat transfer), Interplanetary medium, Astrophysics - Earth and Planetary Astrophysics
Abstract

International audience; Non-recurrent short-term variations of the galactic cosmic-ray (GCR) flux above 70 MeV n−1 were observed between 2016 February 18 and 2017 July 3 on board the European Space Agency LISA Pathfinder (LPF) mission orbiting around the Lagrange point L1 at 1.5 × 106 km from Earth. The energy dependence of three Forbush decreases is studied and reported here. A comparison of these observations with others carried out in space down to the energy of a few tens of MeV n−1 shows that the same GCR flux parameterization applies to events of different intensity during the main phase. FD observations in L1 with LPF and geomagnetic storm occurrence are also presented. Finally, the characteristics of GCR flux non-recurrent variations (peaks and depressions) of duration

Published
2019

5. Novel methods to measure the gravitational constant in space

Author

J. P. López-Zaragoza, Ferran Gibert, S. Paczkowski, Antoine Petiteau, Paul McNamara, J. A. Lobo, Luigi Ferraioli, L. Wissel, Domenico Giardini, F. Rivas, Gerhard Heinzel, W. J. Weber, Daniele Bortoluzzi, L. Mendes, Carlos F. Sopuerta, B. Kaune, Gudrun Wanner, M. S. Hartig, N. Meshksar, Miquel Nofrarías, Juan Ramos-Castro, Víctor S. Martín, F. Martin-Porqueras, Daniele Vetrugno, M. de Deus Silva, Daniel Hollington, Davor Mance, Pierre Binétruy, T. J. Sumner, L. Liu, A. M. Cruise, Ph. Jetzer, Lluis Gesa, D. Texier, E. Castelli, Christian J. Killow, Jacob Slutsky, Valerio Ferroni, James Ira Thorpe, R. Maarschalkerweerd, J. Baird, A. Wittchen, Antonella Cavalleri, P. Pivato, José F. F. Mendes, J. Reiche, D. Hoyland, E. D. Fitzsimons, A. Cesarini, G. Russano, Nikolaos Karnesis, M. Born, N. Korsakova, Michael Perreur-Lloyd, R. Giusteri, Eric Plagnol, Karsten Danzmann, Catia Grimani, G. Dixon, S. Vitale, M. Hewitson, Ingo Diepholz, Peter Zweifel, Peter Wass, Rita Dolesi, L. Martin-Polo, J. Grzymisch, H. Ward, D. I. Robertson, Michele Armano, M. Freschi, J. Martino, C. Trenkel, Ian Harrison, Henri Inchauspe, M. Hueller, Heather Audley, Oliver Jennrich, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), LISA Pathfinder, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Astrofísica, Physics, 010308 nuclear & particles physics, General physics, Mechanics, Astrophysics, Space (mathematics), 01 natural sciences, Measure (mathematics), Cosmology, Laboratory studies of gravity, Gravitation, Gravitational constant, Acceleration, Pathfinder, cosmic rays, Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], 0103 physical sciences, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Experiments in gravity, 010306 general physics, Suspension (vehicle), cosmology, Cosmology and astrophysics
Abstract

International audience; We present two novel methods, tested by LISA Pathfinder, to measure the gravitational constant G for the first time in space. Experiment 1 uses electrostatic suspension forces to measure a change in acceleration of a test mass due to a displaced source mass. Experiment 2 measures a change in relative acceleration between two test masses due to a slowly varying fuel tank mass. Experiment 1 gave a value of G=6.71±0.42(×10-11) m3 s-2 kg-1 and experiment 2 gave 6.15±0.35(×10-11) m3 s-2 kg-1, both consistent with each other to 1σ and with the CODATA 2014 recommended value of 6.67408±0.00031(×10-11) m3 s-2 kg-1 to 2σ. We outline several ideas to improve the results for a future experiment, and we suggest that a measurement in space would isolate many terrestrial issues that could be responsible for the inconsistencies between recent measurements.

Published
2019

6. Micrometeoroid Events in LISA Pathfinder

Author

Ignacio Mateos, St Drs Operations Team, J. Grzymisch, H. Ward, D. Wealthy, H. Rozemeijer, J. A. Lobo, Gerhard Heinzel, Nicole Pagane, A. Zambotti, S. Paczkowski, Ivan Lloro, Ph. Jetzer, Antoine Petiteau, Paul McNamara, P. Prat, José F. F. Mendes, Daniele Bortoluzzi, N. Brandt, Nikolaos Karnesis, James Ira Thorpe, R. De Rosa, Michael Tröbs, Carlos F. Sopuerta, Michele Armano, L. Mendes, C. Zanoni, Davor Mance, J. O’Donnell, Daniele Vetrugno, B. Johlander, Lluis Gesa, G. Auger, Curt Cutler, John Ziemer, M. Freschi, Henri Inchauspe, A. Schleicher, F. Martin-Porqueras, M. Girard, M. Hewitson, D. Shaul, R. Maarschalkerweerd, Karsten Danzmann, T. J. Sumner, D. Texier, E. D. Fitzsimons, F. Rivas, Daniel Hollington, L. Liu, Oliver Jennrich, Miquel Nofrarías, P. Pivato, A. M. Cruise, W. J. Weber, R. Giusteri, Michael Perreur-Lloyd, John G. Baker, P. Sarra, Tobias Ziegler, N. Korsakova, Aniello Grado, Heather Audley, Peter Wass, Tyson Littenberg, Gudrun Wanner, Sophie Hourihane, Pierre Binétruy, Antonella Cavalleri, L. Di Fiore, R. Gerndt, Jacob Slutsky, Valerio Ferroni, S. Vitale, Christian J. Killow, B. Kaune, C. Trenkel, S. Madden, Diego Janches, Juan Ramos-Castro, D. Hoyland, C. Marrese-Reading, J. Reiche, Rita Dolesi, N. Dunbar, Catia Grimani, P. Barela, C. Dunn, C. García Marirrodriga, A. Wittchen, R. Flatscher, P. Maghami, U. Ragnit, I. Li, Ruggero Stanga, Mauro Hueller, Nate Demmons, S. Javidnia, Petr Pokorny, G. Dixon, J. P. López-Zaragoza, M. Born, A. Cesarini, G. Russano, Ferran Gibert, J. Martino, J. Baird, Massimo Bassan, O. Hsu, Andrew Romero-Wolf, L. Wissel, Ingo Diepholz, M. de Deus Silva, Luigi Ferraioli, Eric Plagnol, V. Martín, Domenico Giardini, M. Caleno, D. I. Robertson, Peter Zweifel, J. Mehta, L. Martin-Polo, I. Harrison, Thorpe, J. I., Slutsky, J., Baker, J. G., Littenberg, T. B., Hourihane, S., Pagane, N., Pokorny, P., Janches, D., Armano, M., Audley, H., Auger, G., Baird, J., Bassan, M., Binetruy, P., Born, M., Bortoluzzi, D., Brandt, N., Caleno, M., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., De Deus Silva, M., DE ROSA, Rosario, Di Fiore, L., Diepholz, I., Dixon, G., Dolesi, R., Dunbar, N., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Flatscher, R., Freschi, M., Garcia Marirrodriga, C., Gerndt, R., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grado, A., Grimani, C., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspe, H., Jennrich, O., Jetzer, P., Johlander, B., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Lobo, J. A., Lloro, I., Liu, L., Lopez-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Martin, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Madden, S., Mateos, I., Mcnamara, P. W., Mendes, J., Mendes, L., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Prat, P., Ragnit, U., Ramos-Castro, J., Reiche, J., Robertson, D. I., Rozemeijer, H., Rivas, F., Russano, G., Sarra, P., Schleicher, A., Shaul, D., Sopuerta, C. F., Stanga, R., Sumner, T., Texier, D., Trenkel, C., Trobs, M., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P., Wealthy, D., Weber, W. J., Wissel, L., Wittchen, A., Zambotti, A., Zanoni, C., Ziegler, T., Zweifel, P., Barela, P., Cutler, C., Demmons, N., Dunn, C., Girard, M., Hsu, O., Javidnia, S., Li, I., Maghami, P., Marrese-Reading, C., Mehta, J., Romero-Wolf, A., Ziemer, J., AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, and Science and Technology Facilities Council (STFC)

Subjects
Astrofísica, Solar System, 010504 meteorology & atmospheric sciences, Meteors, Astrophysics, 01 natural sciences, Planet, meteoroids, 010303 astronomy & astrophysics, Earth and Planetary Astrophysics (astro-ph.EP), 0306 Physical Chemistry (incl. Structural), Settore FIS/01, Physics, Sistema solar, education.field_of_study, Micrometeoroid, Astrophysics::Instrumentation and Methods for Astrophysics, Meteoroids, instrumentation: miscellaneous, meteorites, meteors, meteoroids, Asteroid, Physical Sciences, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physics::Space Physics, Astrophysics::Earth and Planetary Astrophysics, miscellaneous [Instrumentation], Solar system, Population, FOS: Physical sciences, Astronomy & Astrophysics, meteorites, 0201 Astronomical and Space Sciences, 0103 physical sciences, meteors, education, 0105 earth and related environmental sciences, Science & Technology, Zodiacal light, Meteoroid, instrumentation: miscellaneou, Astronomy, Astronomy and Astrophysics, miscellaneous, meteorites, meteors, meteoroids [instrumentation], Pathfinder, 13. Climate action, Space and Planetary Science, [SDU]Sciences of the Universe [physics], Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], Enginyeria electrònica::Instrumentació i mesura [Àrees temàtiques de la UPC], ORBITS, Astrophysics - Earth and Planetary Astrophysics, Meteorites
Abstract

The zodiacal dust complex, a population of dust and small particles that pervades the Solar System, provides important insight into the formation and dynamics of planets, comets, asteroids, and other bodies. Here we present a new set of data obtained using a novel technique: direct measurements of momentum transfer to a spacecraft from individual particle impacts. This technique is made possible by the extreme precision of the instruments flown on the LISA Pathfinder spacecraft, a technology demonstrator for a future space-based gravitational wave observatory that operated near the first Sun-Earth Lagrange point from early 2016 through Summer of 2017. Using a simple model of the impacts and knowledge of the control system, we show that it is possible to detect impacts and measure properties such as the transferred momentum (related to the particle's mass and velocity), direction of travel, and location of impact on the spacecraft. In this paper, we present the results of a systematic search for impacts during 4348 hours of Pathfinder data. We report a total of 54 candidates with momenta ranging from 0.2$\,\mu\textrm{Ns}$ to 230$\,\mu\textrm{Ns}$. We furthermore make a comparison of these candidates with models of micrometeoroid populations in the inner solar system including those resulting from Jupiter-family comets, Oort-cloud comets, Hailey-type comets, and Asteroids. We find that our measured population is consistent with a population dominated by Jupiter-family comets with some evidence for a smaller contribution from Hailey-type comets. This is in agreement with consensus models of the zodiacal dust complex in the momentum range sampled by LISA Pathfinder., Comment: 22 pages, 14 figures, accepted in ApJ

Published
2019

7. LISA Pathfinder micronewton cold gas thrusters: In-flight characterization

Author

Nikolaos Karnesis, N. Korsakova, Jacob Slutsky, Valerio Ferroni, Daniele Vetrugno, Davor Mance, S. Paczkowski, D. Texier, Henri Inchauspe, G. Dixon, Ivan Lloro, D. Hoyland, Luigi Ferraioli, M. de Deus Silva, P. Pivato, L. Wissel, Ignacio Mateos, J. Grzymisch, Ph. Jetzer, P. Zweifel, Antonella Cavalleri, T. J. Sumner, L. Liu, N. Meshksar, Daniele Bortoluzzi, L. Mendes, Peter Wass, E. Castelli, F. Rivas, E. D. Fitzsimons, Pierre Binétruy, Lluis Gesa, S. Vitale, Heather Audley, F. Martin-Porqueras, R. Giusteri, J. Martino, A. M. Cruise, Michele Armano, R. Maarschalkerweerd, D. I. Robertson, A. Wittchen, Antoine Petiteau, Paul McNamara, Daniel Hollington, Gudrun Wanner, Miquel Nofrarías, Juan Ramos-Castro, M. Freschi, Catia Grimani, Carlos F. Sopuerta, Christian J. Killow, J. Baird, M. Hueller, Oliver Jennrich, Rita Dolesi, M. Born, Eric Plagnol, Domenico Giardini, J. A. Lobo, James Ira Thorpe, Ingo Diepholz, José F. F. Mendes, J. Reiche, A. Cesarini, G. Russano, M. Hewitson, W. J. Weber, L. Martin-Polo, H. Ward, I. Harrison, Michael Perreur-Lloyd, J. P. López-Zaragoza, Karsten Danzmann, Ferran Gibert, B. Kaune, Víctor S. Martín, Gerhard Heinzel, AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), LISA Pathfinder, Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Inertial frame of reference, Gravitational-wave observatory, noise: low, satellite, Propulsion, 01 natural sciences, 7. Clean energy, Gravitational waves, cosmic rays, Ones gravitacionals, gas, 0103 physical sciences, Experiments in gravity, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Aerospace engineering, Física::Relativitat::Gravitació [Àrees temàtiques de la UPC], 010306 general physics, accelerator: design, Physics, LISA, Spacecraft, 010308 nuclear & particles physics, business.industry, electronics, Astrophysics::Instrumentation and Methods for Astrophysics, stability, Metrology, Pathfinder, Harmonics, Physics::Space Physics, control system, business, cosmology, performance, Space environment, ejection
Abstract

International audience; The LISA Pathfinder (LPF) mission has demonstrated the ability to limit and measure the fluctuations in acceleration between two free falling test masses down to sub-femto-g levels. One of the key elements to achieve such a level of residual acceleration is the drag free control. In this scheme the spacecraft is used as a shield against any external disturbances by adjusting its relative position to a reference test mass. The actuators used to move the spacecraft are cold gas micropropulsion thrusters. In this paper, we report in-flight characterization of these thrusters in term of noise and artefacts during science operations using all the metrology capabilities of LISA Pathfinder. Using the LISA Pathfinder test masses as an inertial reference frame, an average thruster noise of ∼0.17 μN/Hz is observed and decomposed into a common (coherent) and an uncorrelated component. The very low noise and stability of the onboard metrology system associated with the quietness of the space environment allowed the measurement of the thruster noise down to ∼20 μHz, more than an order of magnitude below any ground measurement. Spectral lines were observed around ∼1.5 mHz and its harmonics and around 55 and 70 mHz. They are associated with the cold gas system itself and possibly to a clock synchronization issue. The thruster noise-floor exhibits an excess of ∼70% compared to characterization that have been made on ground on a single unit and without the feeding system. However this small excess has no impact on the LPF mission performance and is compatible with the noise budget for the upcoming LISA gravitational wave observatory. Over the whole mission, nominal, and extension, the thrusters showed remarkable stability for both the science operations and the different maneuvers necessary to maintain LPF on its orbit around L1. It is therefore concluded that a similar cold gas system would be a viable propulsion system for the future LISA mission.

Published
2019

8. Characterisation of Au surface properties relevant for UV photoemission-based charge control for space inertial sensors

Author

Henri Inchauspe, Guido Mueller, John Conklin, Stephen Apple, Peter Wass, Samantha Parry, Benjamin Letson, and Taiwo Olatunde

Subjects
Physics, Physics and Astronomy (miscellaneous), business.industry, Semiconductor device, Electromagnetic radiation, law.invention, Wavelength, Inertial measurement unit, law, Secondary emission, Charge control, Optoelectronics, Electric potential, business, Light-emitting diode
Abstract

Precision space inertial sensors used for satellite geodesy missions, tests of fundamental physics, and gravitational wave observation utilise UV photoemission to control the electric potential of free-falling test masses with respect to their surrounding electrode housings. Successful generation of photoelectrons requires UV light energies greater than the work function of the illuminated surface. To ensure bi-polar test mass charge control (positive and negative charge rates), the quantum yields of the test mass and electrode housing surfaces must be well-balanced. LISA Pathfinder used mercury vapour lamps at 254 nm to discharge the gold coated test mass by likely relying on contaminants to lower the work function of gold from its nominal value of 5.2 eV. The LISA gravitational wave mission plans to use UV light emitting diodes (LEDs) instead of mercury vapour lamps. These UV LEDs have a lower mass, higher power efficiency, and produce light at wavelengths below 240 nm. In this paper, we measure the quantum yields of several Au-coated surfaces over a range of UV wavelengths and environmental conditions, varying temperature, vacuum pressure, and measuring over long periods of time. We use these data to draw conclusions and make recommendations for the development and handling of precision space inertial sensors for LISA and for other missions in the future.

Published
2020

9. Precision charge control for isolated free-falling test masses: LISA pathfinder results

Author

J. Martino, Domenico Giardini, Antoine Petiteau, Paul McNamara, Ian Harrison, S. Paczkowski, Carlos F. Sopuerta, Eric Plagnol, B. Kaune, Peter Wass, Henri Inchauspe, N. Korsakova, D. I. Robertson, Víctor S. Martín, J. Baird, Daniele Vetrugno, N. Meshskar, P. Sarra, Oliver Jennrich, T. J. Sumner, L. Liu, Ph. Jetzer, E. Castelli, J. Grzymisch, Gerhard Heinzel, S. Vitale, D. Shaul, H. Ward, P. Pivato, F. Rivas, Jacob Slutsky, Valerio Ferroni, G. Santoruvo, Michele Armano, Catia Grimani, M. Hueller, D. Hoyland, G. Dixon, M. Freschi, Ignacio Mateos, Lluis Gesa, Karsten Danzmann, Michael Perreur-Lloyd, Pierre Binétruy, Daniel Hollington, Nikolaos Karnesis, W. J. Weber, R. Maarschalkerweerd, M. de Deus Silva, F. Martin-Porqueras, P. Zweifel, Antonella Cavalleri, A. Wittchen, Gudrun Wanner, J. A. Lobo, Juan Ramos-Castro, James Ira Thorpe, Luigi Ferraioli, E. D. Fitzsimons, Heather Audley, R. Giusteri, M. Born, L. Wissel, Christian J. Killow, Markus Pfeil, Rita Dolesi, S. Waschke, L. Mendes, Ingo Diepholz, José F. F. Mendes, A. M. Cruise, M. Hewitson, D. Bortoluzzi, Miquel Nofrarías, J. P. López-Zaragoza, Ferran Gibert, L. Martin-Polo, J. Reiche, A. Cesarini, G. Russano, Davor Mance, D. Texier, Ivan Lloro, F. Mailland, C. Trenkel, AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), LISA, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), LISA Pathfinder Collaboration, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica

Subjects
Physics - Instrumentation and Detectors, Physics and Astronomy (miscellaneous), 7. Clean energy, 01 natural sciences, Physics, Particles & Fields, Gravitational wave detectors, Software, MATLAB, physics.ins-det, MISSION, computer.programming_language, Physics, Instrumentation and Detectors (physics.ins-det), 3. Good health, cosmic radiation, Physical Sciences, GEANT, charge: surface, Física::Relativitat [Àrees temàtiques de la UPC], photoelectron, Experimental studies of gravity, FOS: Physical sciences, Astronomy & Astrophysics, Electric charge, Charge, electric field: effect, Gravitational waves, cosmic rays, Ones gravitacionals, photon: irradiation, Electric field, 0103 physical sciences, Charge control, Experiments in gravity, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, GEANT4, Science & Technology, charge: electric, 010308 nuclear & particles physics, Gravitational wave, business.industry, Charge (physics), FIELDS, charge: induced, Computational physics, Pathfinder, business, cosmology, computer
Abstract

International audience; The LISA Pathfinder charge management device was responsible for neutralizing the cosmic-ray-induced electric charge that inevitably accumulated on the free-falling test masses at the heart of the experiment. We present measurements made on ground and in flight that quantify the performance of this contactless discharge system which was based on photoemission under UV illumination. In addition, a two-part simulation is described that was developed alongside the hardware. Modeling of the absorbed UV light within the Pathfinder sensor was carried out with the Geant4 software toolkit and a separate Matlab charge transfer model calculated the net photocurrent between the test masses and surrounding housing in the presence of AC and DC electric fields. We confront the results of these models with observations and draw conclusions for the design of discharge systems for future experiments like LISA that will also employ free-falling test masses.

Published
2018

10. Calibrating the system dynamics of LISA Pathfinder

Author

J. Grzymisch, H. Ward, W. J. Weber, Christian J. Killow, Ignacio Mateos, M. de Deus Silva, S. Paczkowski, Pierre Binétruy, Eric Plagnol, J. Reiche, J. P. López-Zaragoza, N. Korsakova, Gerhard Heinzel, N. Meshksar, J. Martino, A. Cesarini, G. Russano, F. Rivas, Domenico Giardini, G. Dixon, Antonella Cavalleri, Ferran Gibert, Catia Grimani, Ian Harrison, T. J. Sumner, Oliver Jennrich, Henri Inchauspe, Antoine Petiteau, Gudrun Wanner, L. Liu, Paul McNamara, Michael Perreur-Lloyd, Peter Zweifel, Juan Ramos-Castro, L. Martin-Polo, E. Castelli, Carlos F. Sopuerta, Lluis Gesa, J. Baird, Heather Audley, R. Maarschalkerweerd, José F. F. Mendes, Jacob Slutsky, Valerio Ferroni, Daniele Vetrugno, A. Wittchen, M. Hueller, M. Hewitson, D. Hoyland, S. Vitale, A. M. Cruise, Nikolaos Karnesis, B. Kaune, P. Pivato, Davor Mance, D. Texier, D. I. Robertson, Luigi Ferraioli, M. Born, Víctor S. Martín, James Ira Thorpe, F. Martin-Porqueras, Ph. Jetzer, L. Wissel, Daniele Bortoluzzi, L. Mendes, Karsten Danzmann, Miquel Nofrarías, Daniel Hollington, J. A. Lobo, Michele Armano, M. Freschi, Peter Wass, Ivan Lloro, R. Giusteri, Rita Dolesi, E. D. Fitzsimons, Ingo Diepholz, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
noise, detector: performance, detector: satellite, FOS: Physical sciences, Astronomy & Astrophysics, Residual, 01 natural sciences, Physics, Particles & Fields, INTERFEROMETRY, Acceleration, 0103 physical sciences, Calibration, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Aerospace engineering, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), MISSION, Physics, LISA, Science & Technology, Spacecraft, 010308 nuclear & particles physics, Noise (signal processing), business.industry, Gravitational wave, gravitational radiation, Astrophysics::Instrumentation and Methods for Astrophysics, acceleration, stability, calibration, gravitational radiation detector, System dynamics, Pathfinder, Physical Sciences, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], readout, business, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

International audience; LISA Pathfinder (LPF) was a European Space Agency mission with the aim to test key technologies for future space-borne gravitational-wave observatories like LISA. The main scientific goal of LPF was to demonstrate measurements of differential acceleration between free-falling test masses at the sub-femto-g level, and to understand the residual acceleration in terms of a physical model of stray forces, and displacement readout noise. A key step toward reaching the LPF goals was the correct calibration of the dynamics of LPF, which was a three-body system composed by two test-masses enclosed in a single spacecraft, and subject to control laws for system stability. In this work, we report on the calibration procedures adopted to calculate the residual differential stray force per unit mass acting on the two test-masses in their nominal positions. The physical parameters of the adopted dynamical model are presented, together with their role on LPF performance. The analysis and results of these experiments show that the dynamics of the system was accurately modeled and the dynamical parameters were stationary throughout the mission. Finally, the impact and importance of calibrating system dynamics for future space-based gravitational wave observatories is discussed.

Published
2018

11. Beyond the required LISA free-fall performance: new LISA Pathfinder results down to 20 μHz

Author

Daniele Vetrugno, Oliver Jennrich, P. Pivato, Daniele Bortoluzzi, L. Mendes, Ph. Jetzer, Gerhard Heinzel, L. Martin-Polo, Miquel Nofrarías, Christian J. Killow, Pierre Binétruy, Antoine Petiteau, Ivan Lloro, N. Meshksar, Paul McNamara, E. D. Fitzsimons, Daniel Hollington, A. Cesarini, G. Russano, Carlos F. Sopuerta, Karsten Danzmann, R. Giusteri, Salvatore Vitale, Luigi Ferraioli, T. J. Sumner, L. Liu, Lluis Gesa, Michael Perreur-Lloyd, Eric Plagnol, V. Martín, J. A. Lobo, Rita Dolesi, E. Castelli, S. Paczkowski, Jacob Slutsky, Valerio Ferroni, Peter Zweifel, B. Kaune, Mauro Hueller, Heather Audley, R. Maarschalkerweerd, Michele Armano, D. Hoyland, G. Dixon, A. Wittchen, M. Freschi, J. P. López-Zaragoza, Ferran Gibert, Peter Wass, José F. F. Mendes, Nikolaos Karnesis, Davor Mance, D. Texier, I. Harrison, D. I. Robertson, Ignacio Mateos, Antonella Cavalleri, M. Hewitson, Domenico Giardini, J. Martino, L. Wissel, N. Korsakova, J. Reiche, J. Grzymisch, H. Ward, F. Rivas, Gudrun Wanner, Juan Ramos-Castro, M. Born, Ingo Diepholz, James Ira Thorpe, J. Baird, Henri Inchauspe, W. J. Weber, F. Martin-Porqueras, A. M. Cruise, M. de Deus Silva, Catia Grimani, AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Astrofísica, General Physics and Astronomy, Astrophysics, Noise figure, 01 natural sciences, 09 Engineering, LISA Pathfinder, pressure, benchmark, Noise performance, force: electrostatic, Physics, 02 Physical Sciences, Noise measurement, Brownian noise, Benchmarking, statistics, frequency, Physical Sciences, European Space Agency, Space probes, performance, General Physics, noise, perturbation, Physics, Multidisciplinary, Experimental benchmarks, calibration: electrostatic, Low frequency, Gravitational waves, Physics and Astronomy (all), Ones gravitacionals, 0103 physical sciences, ddc:530, noise: acceleration, 010306 general physics, 01 Mathematical Sciences, LISA, Science & Technology, 010308 nuclear & particles physics, Gravitational wave, Noise measurements, Física::Electromagnetisme::Ones electromagnètiques [Àrees temàtiques de la UPC], Low-frequency, Computational physics, Pathfinder, Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], Differential accelerations, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

In the months since the publication of the first results, the noise performance of LISA Pathfinder has improved because of reduced Brownian noise due to the continued decrease in pressure around the test masses, from a better correction of noninertial effects, and from a better calibration of the electrostatic force actuation. In addition, the availability of numerous long noise measurement runs, during which no perturbation is purposely applied to the test masses, has allowed the measurement of noise with good statistics down to 20 μHz. The Letter presents the measured differential acceleration noise figure, which is at (1.74±0.05) fm s−2/√Hz above 2 mHz and (6±1)×10 fm s−2/√Hz at 20 μHz, and discusses the physical sources for the measured noise. This performance provides an experimental benchmark demonstrating the ability to realize the low-frequency science potential of the LISA mission, recently selected by the European Space Agency., Physical Review Letters, 120 (6), ISSN:0031-9007, ISSN:1079-7114

Published
2018

12. Characteristics and Energy Dependence of Recurrent Galactic Cosmic-Ray Flux Depressions and of a Forbush Decrease with LISA Pathfinder

Author

C. Zenoni, Lluis Gesa, J. Martino, A. Zambotti, Gerhard Heinzel, R. Maarschalkerweerd, A. Wittchen, I. Harrison, L. Martin-Polo, N. Korsakova, Stefano Vitale, Luis Mendes, J. A. Lobo, Marco Freschi, Nikolaos Karnesis, Jacob Slutsky, Valerio Ferroni, B. Kaune, D. Hoyland, Antoine Petiteau, L. Wissel, Daniele Bortoluzzi, Paul McNamara, T. J. Sumner, L. Liu, Pierre Binétruy, Carlos F. Sopuerta, Catia Grimani, Antonella Cavalleri, Ignacio Mateos, Heather Audley, Daniele Vetrugno, Miquel Nofrarías, J. Baird, Massimo Bassan, Monica Laurenza, Davor Mance, M. Born, Federico Sabbatini, F. Martin-Porqueras, James Ira Thorpe, Michele Armano, A. M. Cruise, Philippe Jetzer, E. D. Fitzsimons, Christian J. Killow, Karsten Danzmann, J. Grzymisch, H. Ward, J. Reiche, P. Pivato, D. I. Robertson, Henri Inchauspe, Ingo Diepholz, A. Cesarini, G. Russano, M. Fabi, M. de Deus Silva, Mauro Hueller, R. Giusteri, G. Dixon, Peter Wass, S. Paczkowski, N. Finetti, F. Rivas, Peter Zweifel, Rita Dolesi, Oliver Jennrich, Eric Plagnol, Michael Perreur-Lloyd, Gudrun Wanner, Domenico Giardini, Juan Ramos-Castro, Vicente Martín, Daniel Hollington, Simone Benella, Daniele Telloni, Ivan Lloro, J. P. López-Zaragoza, Ferran Gibert, Damien Texier, Luigi Ferraioli, José F. F. Mendes, M. Hewitson, W. J. Weber, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
Astrofísica, solar–terrestrial relations, 010504 meteorology & atmospheric sciences, 0306 Physical Chemistry (Incl. Structural), [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], interferometers [instrumentation], Astrophysics, 01 natural sciences, 0305 Organic Chemistry, 27-DAY VARIATION, Physics - Space Physics, Coronal mass ejection, Astrophysics::Solar and Stellar Astrophysics, cosmic rays, instrumentation: interferometers, interplanetary medium, solar-terrestrial relations, Sun: heliosphere, Sun: rotation, 010303 astronomy & astrophysics, Sun rotation, Solar–terrestrial relations, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physics, High Energy Astrophysical Phenomena (astro-ph.HE), heliosphere [Sun], Settore FIS/01 - Fisica Sperimentale, Astrophysics::Instrumentation and Methods for Astrophysics, Space physics, charged particle, solar, ELECTRONS, CORONAL MASS EJECTIONS, interferometers, Sun: rotation [cosmic rays, instrumentation], Astrophysics - Solar and Stellar Astrophysics, SOLAR-WIND, cosmic radiation: galaxy, Physical Sciences, Physics::Space Physics, Solar rotation, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, cosmic radiation: flux, Astrophysics::High Energy Astrophysical Phenomena, HELIOSPHERIC MODULATION, Interplanetary medium, FOS: Physical sciences, Cosmic ray, rotation [Sun], Astronomy & Astrophysics, 0103 physical sciences, PARTICLES, Forbush decrease, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], instrumentation interferometers, SPACED DATA, Solar and Stellar Astrophysics (astro-ph.SR), 0105 earth and related environmental sciences, Sun heliosphere, solar terrestrial relations, SPECTRUM, LISA, Science & Technology, cosmic radiation: energy spectrum, INTENSITY, POSITRONS, Astronomy and Astrophysics, Space Physics (physics.space-ph), cosmic rays, instrumentation interferometers, interplanetary medium, solar terrestrial relations, Sun heliosphere, Sun rotation, 0201 Astronomical And Space Sciences, monitoring, 13. Climate action, Space and Planetary Science, Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], charged particle: detector, Interplanetary spaceflight, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Heliosphere
Abstract

The final publication is available at IOS Press through http://dx.doi.org/10.3847/1538-4357/aaa774 Galactic cosmic-ray (GCR) energy spectra observed in the inner heliosphere are modulated by the solar activity, the solar polarity and structures of solar and interplanetary origin. A high counting rate particle detector (PD) aboard LISA Pathfinder, meant for subsystems diagnostics, was devoted to the measurement of GCR and solar energetic particle integral fluxes above 70 MeV n-1 up to 6500 counts s-1. PD data were gathered with a sampling time of 15 s. Characteristics and energy dependence of GCR flux recurrent depressions and of a Forbush decrease dated 2016 August 2 are reported here. The capability of interplanetary missions, carrying PDs for instrument performance purposes, in monitoring the passage of interplanetary coronal mass ejections is also discussed.

Published
2018

13. Experimental results from the ST7 mission on LISA Pathfinder

Author

S. Vitale, W. Warner, Lluis Gesa, J. Fernandez, Nikolaos Karnesis, M. Connally, R. Kolasinski, J. Martino, Thomas Randolph, Gerhard Heinzel, R. Maarschalkerweerd, A. Wittchen, J. Gorelik, Eric Ehrbar, S. Rhodes, Ian Harrison, J. Wellman, J. A. Lobo, Thomas Roy, O. Hsu, A. Carmain, Oliver Jennrich, G. Dixon, M. Cherng, Charley Dunn, Henri Inchauspe, Ivan Lloro, D. Miller, F. Rivas, Luigi Ferraioli, L. Chen, D. Kern, L. Markley, Heather Audley, José F. F. Mendes, E. Dorantes, Gudrun Wanner, Peter Wass, S. Paczkowski, T. Le, Juan Ramos-Castro, R. Valencia, Jacob Slutsky, Valerio Ferroni, William E. Connolly, Pierre Binétruy, L. Wissel, H. Umfress, R. Parikh, D. Hoyland, T. J. Sumner, John R. Anderson, L. Liu, M. Hewitson, L. Mendes, E. Castelli, Vlad Hruby, Antonella Cavalleri, N. Korsakova, O. Liepack, Shahram Javidnia, Miquel Nofrarías, John J. Evans, Michele Armano, C. Kuo, M. Freschi, Daniel Hollington, Garth Franklin, Douglas J. Jackson, G. Aveni, K. Blackman, M. Hueller, Christian J. Killow, M. S. Anderson, J. P. López-Zaragoza, M. Born, Ingo Diepholz, S. Malik, N. Meshksar, Ryan Martin, S. Clark, Nate Demmons, Douglas Spence, Ferran Gibert, J. Stocky, W. Tolman, Ignacio Mateos, D. Conroy, Ira Thorpe, G. Plett, Phil Barela, A. Littlefield, Peter Willis, J. D’Agostino, M. Cooper, A. M. Cruise, D. Bortoluzzi, Catia Grimani, M. Duran, M. de Deus Silva, H. Shaw, F. Martin-Porqueras, J. Reiche, A. Cesarini, G. Russano, J. Grzymisch, H. Ward, E. D. Fitzsimons, Peter Zweifel, R. Giusteri, Ph. Jetzer, M. Knopp, T. Ramsey, D. I. Robertson, J. Mehta, Domenico Giardini, W. J. Weber, M. Girard, Rita Dolesi, L. Martin-Polo, Colleen Marrese-Reading, Karsten Danzmann, D. Bame, I. Li, Eric Plagnol, B. Kaune, Víctor S. Martín, C. Valerio, Andrew Romero-Wolf, D. Nguyen, J. Baird, Greg M. Anderson, Michael Perreur-Lloyd, Peiman Maghami, Davor Mance, D. Texier, John Ziemer, J. Tallon, Antoine Petiteau, Paul McNamara, A. Ruiz, Carlos F. Sopuerta, J. O’Donnell, Daniele Vetrugno, Curt Cutler, J. Mennela, P. Pivato, Jurg Zwahlen, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ST7, LISA Pathfinder, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), and ST7 Team

Subjects
detector: technology, Space technology, Gravitational-wave observatory, Physics and Astronomy (miscellaneous), engineering, FOS: Physical sciences, Thrust, Astronomy & Astrophysics, 01 natural sciences, 7. Clean energy, Noise (electronics), Physics, Particles & Fields, cosmic rays, 0103 physical sciences, Experiments in gravity, thrust, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Aerospace engineering, noise: acceleration, 010306 general physics, 010303 astronomy & astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), activity report, Physics, LISA, Science & Technology, Spacecraft, density: spectral, business.industry, Payload, Noise spectral density, Pathfinder, Physical Sciences, control system, business, Astrophysics - Instrumentation and Methods for Astrophysics, cosmology, performance
Abstract

The Space Technology 7 Disturbance Reduction System (ST7-DRS) is a NASA technology demonstration payload that operated from January 2016 through July of 2017 on the European Space Agency's LISA Pathfinder spacecraft. The joint goal of the NASA and ESA missions was to validate key technologies for a future space-based gravitational wave observatory targeting the source-rich milliHertz band. The two primary components of ST7-DRS are a micropropulsion system based on colloidal micro-Newton thrusters (CMNTs) and a control system that simultaneously controls the attitude and position of the spacecraft and the two free-flying test masses (TMs). This paper presents our main experimental results and summarizes the overall the performance of the CMNTs and control laws. We find that the CMNT performance to be consistent with pre-flight predictions, with a measured system thrust noise on the order of $100\,\textrm{nN}/\sqrt{\textrm{Hz}}$ in the $1\,\textrm{mHz}\leq f \leq 30\,\textrm{mHz}$ band. The control system maintained the TM-spacecraft separation with an RMS error of less than 2$\,$nm and a noise spectral density of less than $3\,\textrm{nm}/\sqrt{\textrm{Hz}}$ in the same band. Thruster calibration measurements yield thrust values consistent with the performance model and ground-based thrust-stand measurements, to within a few percent. We also report a differential acceleration noise between the two test masses with a spectral density of roughly $3\,\textrm{fm}/\textrm{s}^2/\sqrt{\textrm{Hz}}$ in the $1\,\textrm{mHz}\leq f \leq 30\,\textrm{mHz}$ band, slightly less than twice as large as the best performance reported with the baseline LISA Pathfinder configuration and below the current requirements for the Laser Interferometer Space Antenna (LISA) mission.

Published
2018

14. Measuring the Galactic Cosmic Ray Flux with the LISA Pathfinder Radiation Monitor

Author

A. Cesarini, G. Russano, Ignacio Mateos, Ivan Lloro, Daniele Bortoluzzi, L. Mendes, Peter Zweifel, Gerhard Heinzel, Miquel Nofrarías, Domenico Giardini, J. P. López-Zaragoza, A. Wittchen, Ferran Gibert, M. de Deus Silva, F. Martin-Porqueras, J. Reiche, Peter Wass, A. M. Cruise, N. Finetti, Davor Mance, Mauro Hueller, B. Kaune, N. Korsakova, D. Texier, Lluis Gesa, T. J. Sumner, L. Liu, G. Dixon, Oliver Jennrich, Catia Grimani, E. Castelli, S. Vitale, Michele Armano, R. Maarschalkerweerd, Ph. Jetzer, Pierre Binétruy, M. Freschi, Antoine Petiteau, Paul McNamara, Luigi Ferraioli, D. I. Robertson, Jacob Slutsky, Valerio Ferroni, E. Plagnol, James Ira Thorpe, Carlos F. Sopuerta, D. Hoyland, Karsten Danzmann, M. Born, L. Martin-Polo, Antonella Cavalleri, J. Grzymisch, Henri Inchauspe, Ingo Diepholz, V. Martín, J. Martino, Daniele Vetrugno, Nikolaos Karnesis, H. Ward, F. Rivas, L. Wissel, P. Pivato, Gudrun Wanner, Juan Ramos-Castro, I. Harrison, Michael Perreur-Lloyd, N. Meshskar, Christian J. Killow, José F. F. Mendes, M. Hewitson, W. J. Weber, R. Giusteri, Rita Dolesi, J. Baird, E. D. Fitzsimons, J. A. Lobo, S. Paczkowski, Daniel Hollington, Heather Audley, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)

Subjects
Astrofísica, Pathfinder, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Cosmic ray, Astrophysics, Radiation, 01 natural sciences, 0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics, Charging, GCR, GEANT4, LISA, Radiation Monitor, Astronomy and Astrophysics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010303 astronomy & astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Physics, Spacecraft, 010308 nuclear & particles physics, Gravitational wave, business.industry, Astronomy, Nuclear & Particles Physics, 0201 Astronomical And Space Sciences, Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], Physics::Space Physics, Heliospheric current sheet, business, Astrophysics - Instrumentation and Methods for Astrophysics, Noise (radio), astro-ph.IM
Abstract

© . This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ Test mass charging caused by cosmic rays will be a significant source of acceleration noise for space-based gravitational wave detectors like LISA. Operating between December 2015 and July 2017, the technology demonstration mission LISA Pathfinder included a bespoke monitor to help characterise the relationship between test mass charging and the local radiation environment. The radiation monitor made in situ measurements of the cosmic ray flux while also providing information about its energy spectrum. We describe the monitor and present measurements which show a gradual 40% increase in count rate coinciding with the declining phase of the solar cycle. Modulations of up to 10% were also observed with periods of 13 and 26 days that are associated with co-rotating interaction regions and heliospheric current sheet crossings. These variations in the flux above the monitor detection threshold (¿˜¿70¿MeV) are shown to be coherent with measurements made by the IREM monitor on-board the Earth orbiting INTEGRAL spacecraft. Finally we use the measured deposited energy spectra, in combination with a GEANT4 model, to estimate the galactic cosmic ray differential energy spectrum over the course of the mission.

Published
2017

15. MICROSCOPE Mission: First Results of a Space Test of the Equivalence Principle

Author

Alexandre Rebray, Henri Inchauspe, Pascal Prieur, Claus Lämmerzahl, Pascale Danto, Serge Reynaud, Pierre Leseur, Stefanie Bremer, Pierre Fayet, Patrice Carle, Benjamin Pouilloux, Valerio Cipolla, Ratana Chhun, Yves André, Damien Boulanger, Quentin Baghi, Benny Rievers, Meike List, Claude Gageant, Isabelle Panet, Pierre Touboul, Hansjoerg Dittus, Gilles Métris, T. J. Sumner, Laura Serron, Alain Robert, Emilie Hardy, Bruno Christophe, Joel Bergé, Pieter Visser, Phuong-Anh Huynh, Manuel Rodrigues, Daniel Hagedorn, Nicolas Tanguy, Vincent Lebat, Frank Löffler, Françoise Liorzou, Pierre-Yves Guidotti, Stéphanie Lala, Patrick Kayser, Bernard Foulon, Hanns Selig, Thibault Damour, ONERA - The French Aerospace Lab [Palaiseau], ONERA-Université Paris Saclay (COmUE), Géoazur (GEOAZUR 7329), Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Centre National d'Études Spatiales [Toulouse] (CNES), Center of Applied Space Technology and Microgravity (ZARM), Universität Bremen, Institut des Hautes Etudes Scientifiques (IHES), IHES, Deutsches Zentrum für Luft- und Raumfahrt [Köln] (DLR), Laboratoire de Physique Théorique de l'ENS (LPTENS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Physikalisch-Technische Bundesanstalt [Braunschweig] (PTB), ONERA - The French Aerospace Lab [Châtillon], Institut géographique national [IGN] (IGN), Laboratoire Kastler Brossel (LKB (Jussieu)), Blackett Laboratory, Imperial College London, Faculty of Aerospace Engineering [Delft], Delft University of Technology (TU Delft), ONERA, Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), ZARM, University of Bremen, Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), ONERA - The French Aerospace Lab ( Chatillon ), Géoazur ( GEOAZUR ), Université Nice Sophia Antipolis ( UNS ), Université Côte d'Azur ( UCA ) -Université Côte d'Azur ( UCA ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire de la Côte d'Azur, Université Côte d'Azur ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), Centre National d'Etudes Spatiales ( CNES ), Institut des Hautes Etudes Scientifiques ( IHES ), Laboratoire de Physique Théorique de l'ENS ( LPTENS ), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris ( FRDPENS ), Centre National de la Recherche Scientifique ( CNRS ) -École normale supérieure - Paris ( ENS Paris ) -Centre National de la Recherche Scientifique ( CNRS ) -École normale supérieure - Paris ( ENS Paris ) -Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Kastler Brossel ( LKB (Lhomond) ), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud]), Institut des Hautes Études Scientifiques (IHES), Laboratoire de Physique Théorique de l'ENS [École Normale Supérieure] (LPTENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), LAboratoire de REcherche en Géodésie [Paris] (LAREG), Laboratoire des Sciences et Technologies de l'Information Géographique (LaSTIG), École nationale des sciences géographiques (ENSG), Institut National de l'Information Géographique et Forestière [IGN] (IGN)-Institut National de l'Information Géographique et Forestière [IGN] (IGN)-École nationale des sciences géographiques (ENSG), and Institut National de l'Information Géographique et Forestière [IGN] (IGN)-Institut National de l'Information Géographique et Forestière [IGN] (IGN)

Subjects
Microscope, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], General Physics and Astronomy, Space (mathematics), 01 natural sciences, 09 Engineering, General Relativity and Quantum Cosmology, law.invention, Gravitation, Gravitational field, law, platinum, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], orbit, Physics, 02 Physical Sciences, PRINCIPE EQUIVALENCE, Mathematical analysis, [PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph], force: long-range, Physical Sciences, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, General Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics, Multidisciplinary, satellite, MICROSATELLITE, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Weak equivalence, [ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Acceleration, alloy, 0103 physical sciences, titanium, equivalence principle: violation, 010306 general physics, MICROSCOPE, Instrumentation and Methods for Astrophysics (astro-ph.IM), 01 Mathematical Sciences, Science & Technology, 010308 nuclear & particles physics, acceleration, ACCELEROMETRE ELECTROSTATIQUE ULTRASENSIBLE, gravitation, Orbit (dynamics), Satellite, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], statistical
Abstract

According to the Weak Equivalence Principle, all bodies should fall at the same rate in a gravitational field. The MICROSCOPE satellite, launched in April 2016, aims to test its validity at the $10^{-15}$ precision level, by measuring the force required to maintain two test masses (of titanium and platinum alloys) exactly in the same orbit. A non-vanishing result would correspond to a violation of the Equivalence Principle, or to the discovery of a new long-range force. Analysis of the first data gives $\delta\rm{(Ti,Pt)}= [-1 \pm 9 (\mathrm{stat}) \pm 9 (\mathrm{syst})] \times 10^{-15}$ (1$\sigma$ statistical uncertainty) for the titanium-platinum E\"otv\"os parameter characterizing the relative difference in their free-fall accelerations., Comment: Typos corrected

Published
2017

16. LISA Pathfinder closed-loop analysis: a model breakdown of the in-loop observables

Author

Ph. Jetzer, W. J. Weber, Lluis Gesa, Karsten Danzmann, Alexander Schleicher, F. Rivas, R. Maarschalkerweerd, A. Wittchen, J. Grzymisch, Antoine Petiteau, Paul McNamara, D. Wealthy, Gudrun Wanner, Juan Ramos-Castro, H. Rozemeijer, D. Shaul, H. Ward, Eric Plagnol, Catia Grimani, Ian Harrison, Henri Inchauspe, Ignacio Mateos, Carlos F. Sopuerta, Domenico Giardini, A. Zambotti, Michael Troebs, C. Zanoni, P. Prat, R. De Rosa, Michele Armano, B. Kaune, A. Lobo, S. Madden, Antonella Cavalleri, M. Freschi, C. Garcia Marrirodriga, N. Dunbar, M. de Deus Silva, R. Gerndt, J. Baird, M. Bassan, J. Martino, L. Mendel, Daniele Vetrugno, L. Wissel, Pierre Binétruy, L. Di Fiore, J. P. López-Zaragoza, J. Reiche, Martin Hewitson, E. D. Fitzsimons, Oliver Jennrich, Daniel Hollington, Víctor S. Martín, Daniele Bortoluzzi, A. Cesarini, Michael Perreur-Lloyd, G. Russano, Ferran Gibert, Tobias Ziegler, P. Pivato, Gerard Auger, R. Giusteri, M. Caleno, N. Korsakova, Ingo Diepholz, Miquel Nofrarías, Ivan Lloro, M. Cruise, D. I. Robertson, Peter Zweifel, M. Hueller, Luigi Ferraioli, Ruggero Stanga, Tamara Sumner, R. Flatscher, Aniello Grado, Heather Audley, U. Ragnit, N. Karnesis, Rita Dolesi, José F. F. Mendes, Davor Mance, B. Johlander, D. Texier, Jacob Slutsky, Valerio Ferroni, M. Born, D. Hoyland, Peter Wass, James Ira Thorpe, L. Martin-Polo, F. Martin-Porqueras, C. Trenke, S. Paczkowski, P. Sarra, S. Vitale, N. Brandt, L. Liu, Christian J. Killow, Gerhard Heinzel, and LISA Pathfinder Collaboration

Subjects
Physics, History, Science & Technology, 02 Physical Sciences, Observable, Astronomy & Astrophysics, 01 natural sciences, 09 Engineering, Computer Science Applications, Education, Loop (topology), Pathfinder, Control theory, 0103 physical sciences, Physical Sciences, 010306 general physics, Closed loop analysis
Abstract

This paper describes a methodology to analyze, in the frequency domain, the steady-state control performances of the LISA Pathfinder mission. In particular, it provides a technical framework to give a comprehensive understanding of the spectra of all the degrees of freedom by breaking them down into their various physical origins, hence bringing out the major contributions of the control residuals. A reconstruction of the measured in-loop output, extracted from a model of the closed-loop system, is shown as an instance to illustrate the potential of such a model breakdown of the data.

Published
2017

17. LISA Pathfinder: First steps to observing gravitational waves from space

Author

N. Karnesis, C. Garca Marrirodriga, Michele Armano, Ian Harrison, Jacob Slutsky, Valerio Ferroni, D. Hoyland, M. Freschi, Henri Inchauspe, M. Cruise, Daniele Vetrugno, Michael Perreur-Lloyd, Gerhard Heinzel, F. Rivas, Lluis Gesa, Ignacio Mateos, P. Pivato, Ph. Jetzer, Gudrun Wanner, Juan Ramos-Castro, R. Maarschalkerweerd, A. Wittchen, R. Gerndt, Peter Wass, Karsten Danzmann, Antoine Petiteau, Paul McNamara, S. Paczkowski, L. Liu, Carlos F. Sopuerta, R. Giusteri, P. Prat, N. Dunbar, Antonella Cavalleri, S. Vitale, L. Martin-Polo, J. Baird, U. Ragnit, Christian J. Killow, Domenico Giardini, M. de Deus Silva, Rita Dolesi, P. Sarra, H. Rozemeijer, Tobias Ziegler, R. De Rosa, J. Reiche, A. Zambotti, W. J. Weber, D. Shaul, A. Cesarini, G. Russano, M. Bassan, M. Hueller, J. Martino, E. D. Fitzsimons, Alexander Schleicher, R. Flatscher, Catia Grimani, F. Martin-Porqueras, Michael Troebs, Peter Zweifel, J. Grzymisch, M. Born, N. Korsakova, Aniello Grado, Heather Audley, H. Ward, Pierre Binétruy, James Ira Thorpe, L. Wissel, Daniele Bortoluzzi, L. Mendes, B. Johlander, Miquel Nofrarías, C. Zanoni, Eric Plagnol, Ruggero Stanga, Ingo Diepholz, A. Lobo, Martin Hewitson, Daniel Hollington, L. Di Fiore, Oliver Jennrich, M. Caleno, D. Wealthy, D. I. Robertson, C. Trenkel, Luigi Ferraioli, Tamara Sumner, Davor Mance, D. Texier, B. Kaune, S. Madden, Ivan Lloro, José F. F. Mendes, Víctor S. Martín, N. Brandt, J. P. López-Zaragoza, Ferran Gibert, Gerard Auger, and LISA Pathfinder Collaboration

Subjects
Physics, History, Science & Technology, 02 Physical Sciences, Gravitational wave, Settore FIS/01 - Fisica Sperimentale, Astronomy, Astronomy & Astrophysics, Space (mathematics), 09 Engineering, Computer Science Applications, Education, Pathfinder, Physical Sciences
Abstract

LISA Pathfinder, the European Space Agency's technology demonstrator mission for future spaceborne gravitational wave observatories, was launched on 3 December 2015, from the European space port of Kourou, French Guiana. After a short duration transfer to the final science orbit, the mission has been gathering science data since. This data has allowed the science community to validate the critical technologies and measurement principle for low frequency gravitational wave detection and thereby confirming the readiness to start the next generation gravitational wave observatories, such as LISA. This paper will briefly describe the mission, followed by a description of the science operations highlighting the performance achieved. Details of the various experiments performed during the nominal science operations phase can be found in accompanying papers in this volume.

Published
2017

18. Charge-induced force noise on free-falling test masses: results from LISA Pathfinder

Author

B. Johlander, Heather Audley, Gerhard Heinzel, M. Cruise, Ph. Jetzer, José F. F. Mendes, R. Giusteri, M. Hewitson, Lluis Gesa, G. Auger, Antoine Petiteau, Jacob Slutsky, Valerio Ferroni, Paul McNamara, R. Gerndt, Rita Dolesi, N. Korsakova, R. Maarschalkerweerd, A. Wittchen, Karsten Danzmann, Michele Armano, J. Baird, Carlos F. Sopuerta, S. Paczkowski, M. Freschi, Oliver Jennrich, P. Prat, E. D. Fitzsimons, Henri Inchauspe, Daniele Vetrugno, W. J. Weber, Christian J. Killow, B. Kaune, P. Sarra, S. Madden, Daniele Bortoluzzi, Peter Wass, L. Mendes, A. Bursi, C. García Marirrodriga, P. Pivato, Miquel Nofrarías, J. Huesler, F. Martin-Porqueras, Mauro Hueller, H. Rozemeijer, Antonella Cavalleri, R. Flatscher, Pierre Binétruy, N. Brandt, Nikolaos Karnesis, C. Trenkel, C. Zanoni, J. Martino, S. Vitale, Ignacio Mateos, A. Schleicher, J. Gallegos, Daniel Hollington, T. J. Sumner, L. Liu, J. P. López-Zaragoza, Ferran Gibert, M. de Deus Silva, Luigi Ferraioli, N. Dunbar, Catia Grimani, Domenico Giardini, J. A. Romera Perez, Eric Plagnol, V. Martín, M. Caleno, D. I. Robertson, Tobias Ziegler, James Ira Thorpe, A. Moroni, D. Wealthy, U. Ragnit, Ivan Lloro, Davor Mance, D. Texier, J. Reiche, A. Cesarini, G. Russano, Peter Zweifel, I. Harrison, L. Martin-Polo, Michael Perreur-Lloyd, J. Grzymisch, H. Ward, M. Born, Ingo Diepholz, F. Rivas, Gudrun Wanner, Juan Ramos-Castro, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), LISA Pathfinder, LISA Pathfinder Collaboration, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), AstroParticule et Cosmologie ( APC - UMR 7164 ), and Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA )

Subjects
Gravitational-wave observatory, Capacitive sensing, General Physics and Astronomy, Interplanetary flight, Astrophysics, 01 natural sciences, 09 Engineering, Laser interferometers, Gravitational wave detectors, Cosmic ray measurement, Dedicated measurements, force: electrostatic, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], MISSION, Physics, 02 Physical Sciences, Stochastic systems, Astrophysics::Instrumentation and Methods for Astrophysics, Interferometria làser, Electrostatics, Cosmology, electric field, observatory, cosmic radiation, frequency, Physical Sciences, Electrostàtica, Astrophysics - Instrumentation and Methods for Astrophysics, European Space Agency, electrostatic, Noise (radio), Gravitation, Laser interferometer space antenna, General Physics, Electric fields, Physics, Multidisciplinary, Capacitive sensors, FOS: Physical sciences, Gravity waves, LISA Pathfinder Collaboration, Electrostatic measurements, Gravitational waves, Physics and Astronomy (all), Acceleration, Ones gravitacionals, Gravitational reference sensors, Electric field, 0103 physical sciences, Frequency bands, stochastic, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], noise: acceleration, coupling, 010306 general physics, Electrostatic modeling, Instrumentation and Methods for Astrophysics (astro-ph.IM), 01 Mathematical Sciences, LISA, Science & Technology, Interferometers, 010308 nuclear & particles physics, Gravitational wave, Electrostatic force, FIELDS, gravitational radiation detector, Computational physics, Pathfinder, gravitation, Física::Astronomia i astrofísica [Àrees temàtiques de la UPC], mass, Laser interferometry, Differential accelerations, SYSTEM, astro-ph.IM
Abstract

We report on electrostatic measurements made on board the European Space Agency mission LISA Pathfinder. Detailed measurements of the charge-induced electrostatic forces exerted on free-falling test masses (TMs) inside the capacitive gravitational reference sensor are the first made in a relevant environment for a space-based gravitational wave detector. Employing a combination of charge control and electric-field compensation, we show that the level of charge-induced acceleration noise on a single TM can be maintained at a level close to 1.0 fm/s^2/sqrt(Hz) across the 0.1-100 mHz frequency band that is crucial to an observatory such as LISA. Using dedicated measurements that detect these effects in the differential acceleration between the two test masses, we resolve the stochastic nature of the TM charge build up due to interplanetary cosmic rays and the TM charge-to-force coupling through stray electric fields in the sensor. All our measurements are in good agreement with predictions based on a relatively simple electrostatic model of the LISA Pathfinder instrument., Comment: 9 Pages, 3 figures

Published
2017

19. Optimal design of calibration signals in space-borne gravitational wave detectors

Author

Miquel Nofrarias, Nikolaos Karnesis, Ferran Gibert, Michele Armano, Heather Audley, Karsten Danzmann, Ingo Diepholz, Rita Dolesi, Luigi Ferraioli, Valerio Ferroni, Martin Hewitson, Mauro Hueller, Henri Inchauspe, Oliver Jennrich, Natalia Korsakova, Paul W. McNamara, Eric Plagnol, James I. Thorpe, Daniele Vetrugno, Stefano Vitale, Peter Wass, William J. Weber, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie ( APC - UMR 7164 ), and Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA )

Subjects
Optimal design, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), 01 natural sciences, General Relativity and Quantum Cosmology, [ PHYS.GRQC ] Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Theoretical physics, 0103 physical sciences, Electronic engineering, Calibration, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Sensitivity (control systems), 010306 general physics, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation and Methods for Astrophysics (astro-ph.IM), Physics, LISA, gravitational radiation detector: sensitivity, 010308 nuclear & particles physics, Estimation theory, Gravitational wave, Design of experiments, Detector, gravitational radiation, Astrophysics::Instrumentation and Methods for Astrophysics, gravitational radiation detector, Pathfinder, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Astrophysics - Instrumentation and Methods for Astrophysics, gravitational radiation detector: calibration
Abstract

Future space borne gravitational wave detectors will require a precise definition of calibration signals to ensure the achievement of their design sensitivity. The careful design of the test signals plays a key role in the correct understanding and characterisation of these instruments. In that sense, methods achieving optimal experiment designs must be considered as complementary to the parameter estimation methods being used to determine the parameters describing the system. The relevance of experiment design is particularly significant for the LISA Pathfinder mission, which will spend most of its operation time performing experiments to characterise key technologies for future space borne gravitational wave observatories. Here we propose a framework to derive the optimal signals ---in terms of minimum parameter uncertainty--- to be injected to these instruments during its calibration phase. We compare our results with an alternative numerical algorithm which achieves an optimal input signal by iteratively improving an initial guess. We show agreement of both approaches when applied to the LISA Pathfinder case., 12 pages, 6 figures

Published
2016

20. Sub-Femto- g Free Fall for Space-Based Gravitational Wave Observatories: LISA Pathfinder Results

Author

R. Gerndt, F. Rivas, Daniele Bortoluzzi, L. Carbone, L. Mendes, Ph. Jetzer, Walter Fichter, Jacob Slutsky, Valerio Ferroni, D. Hoyland, Ulrich Johann, Gudrun Wanner, Miquel Nofrarías, Peter Wass, Juan Ramos-Castro, Pierre Binétruy, Ivan Lloro, Lluis Gesa, G. Auger, C. Trenkel, Stefano Vitale, James Ira Thorpe, Antoine Petiteau, A. Grynagier, Paul McNamara, A. F. García Marín, G. Congedo, Luigi Ferraioli, M. Born, R. Maarschalkerweerd, Karsten Danzmann, V Wand, C. Zanoni, A. Monsky, Ruggero Stanga, Ingo Diepholz, Carlos F. Sopuerta, F. Steier, A. Cesarini, José F. F. Mendes, Tobias Ziegler, N. Korsakova, G. Russano, F. Guzmán, H. Rozemeijer, M. Hewitson, A. Schleicher, B. Johlander, J. P. López-Zaragoza, Michael Perreur-Lloyd, Michele Armano, Daniel Hollington, Daniele Vetrugno, D. Wealthy, B. Kaune, S. Madden, P. Sarra, A. Zambotti, M. Diaz-Aguilo, Christian J. Killow, Peter Zweifel, Davor Mance, D. Shaul, T. J. Sumner, L. Liu, J. Grzymisch, H. Ward, M. Freschi, L. Di Fiore, Oliver Jennrich, Michael Tröbs, H. B. Tu, R. Flatscher, M. Caleno, D. I. Robertson, J. A. Lobo, S. Paczkowski, Ferran Gibert, L. Martin-Polo, P. Prat, I. Harrison, P. Pivato, Ignacio Mateos, C. García Marirrodriga, Mauro Hueller, D. Texier, A. Wittchen, U. Ragnit, Aniello Grado, Heather Audley, J Sanjuán, C. Warren, J. Reiche, B. Rais, Henri Inchauspe, G. Dixon, Eric Plagnol, V. Martín, Domenico Giardini, Daniele Nicolodi, N. Brandt, Nikolaos Karnesis, Giacomo Ciani, Antonella Cavalleri, J. Martino, R. Giusteri, L. Wissel, Rita Dolesi, J. Baird, Massimo Bassan, R. De Rosa, E. D. Fitzsimons, Gerhard Heinzel, W. J. Weber, A. M. Cruise, F. Martin-Porqueras, M. de Deus Silva, N. Dunbar, Catia Grimani, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica, UK Space Agency, Science and Technology Facilities Council (STFC), Armano, M., Audley, H., Auger, G., Baird, J. T., Bassan, M., Binetruy, P., Born, M., Bortoluzzi, D., Brandt, N., Caleno, M., Carbone, L., Cavalleri, A., Cesarini, A., Ciani, G., Congedo, G., Cruise, A. M., Danzmann, K., De Deus Silva, M., DE ROSA, Rosario, Diaz Aguiló, M., Di Fiore, L., Diepholz, I., Dixon, G., Dolesi, R., Dunbar, N., Ferraioli, L., Ferroni, V., Fichter, W., Fitzsimons, E. D., Flatscher, R., Freschi, M., García Marín, A. F., García Marirrodriga, C., Gerndt, R., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Guzmán, F., Grado, A., Grimani, C., Grynagier, A., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Johann, U., Johlander, B., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Lobo, J. A., Lloro, I., Liu, L., López Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Martín, V., Martin Polo, L., Martino, J., Martin Porqueras, F., Madden, S., Mateos, I., Mcnamara, P. W., Mendes, J., Mendes, L., Monsky, A., Nicolodi, D., Nofrarias, M., Paczkowski, S., Perreur Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Prat, P., Ragnit, U., Raïs, B., Ramos Castro, J., Reiche, J., Robertson, D. I., Rozemeijer, H., Rivas, F., Russano, G., Sanjuán, J., Sarra, P., Schleicher, A., Shaul, D., Slutsky, J., Sopuerta, C. F., Stanga, R., Steier, F., Sumner, T., Texier, D., Thorpe, J. I., Trenkel, C., Tröbs, M., Tu, H. B., Vetrugno, D., Vitale, S., Wand, V., Wanner, G., Ward, H., Warren, C., Wass, P. J., Wealthy, D., Weber, W. J., Wissel, L., Wittchen, A., Zambotti, A., Zanoni, C., Ziegler, T., Zweifel, P., Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
General Physics, Gravitational-wave observatory, detector: performance, Physics, Multidisciplinary, General Physics and Astronomy, Astrophysics, 01 natural sciences, 7. Clean energy, Noise (electronics), 09 Engineering, LISA Pathfinder, Gravitational waves, Acceleration, Physics and Astronomy (all), Square root, Ones gravitacionals, gas, 0103 physical sciences, Orders of magnitude (speed), interferometer: satellite, noise: acceleration, 010303 astronomy & astrophysics, 01 Mathematical Sciences, MISSION, Physics, LISA, Science & Technology, 02 Physical Sciences, density: spectral, 010308 nuclear & particles physics, Gravitational wave, Settore FIS/01 - Fisica Sperimentale, Astrophysics::Instrumentation and Methods for Astrophysics, gravitational radiation, Spectral density, gravitational radiation detector: satellite, detector: sensitivity, gravitation, Physical Sciences, viscosity, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Brownian noise, readout, INTERFEROMETER
Abstract

We report the first results of the LISA Pathfinder in-flight experiment. The results demonstrate that two free-falling reference test masses, such as those needed for a space-based gravitational wave observatory like LISA, can be put in free fall with a relative acceleration noise with a square root of the power spectral density of 5.2 +/- 0.1 fm s(exp -2)/square root of Hz, or (0.54 +/- 0.01) x 10(exp -15) g/square root of Hz, with g the standard gravity, for frequencies between 0.7 and 20 mHz. This value is lower than the LISA Pathfinder requirement by more than a factor 5 and within a factor 1.25 of the requirement for the LISA mission, and is compatible with Brownian noise from viscous damping due to the residual gas surrounding the test masses. Above 60 mHz the acceleration noise is dominated by interferometer displacement readout noise at a level of (34.8 +/- 0.3) fm square root of Hz, about 2 orders of magnitude better than requirements. At f less than or equal to 0.5 mHz we observe a low-frequency tail that stays below 12 fm s(exp -2)/square root of Hz down to 0.1 mHz. This performance would allow for a space-based gravitational wave observatory with a sensitivity close to what was originally foreseen for LISA.

Published
2016

21. In-flight thermal experiments for LISA Pathfinder: Simulating temperature noise at the Inertial Sensors

Author

Ivan Lloro, Antoine Petiteau, Paul McNamara, J. Huesler, C. Zanoni, M. Cruise, Stefano Vitale, Martin Hewitson, Carlos F. Sopuerta, Gerhard Heinzel, Daniel Hollington, S. Paczkowski, N. Brandt, Nikolaos Karnesis, Daniele Bortoluzzi, Daniele Vetrugno, L. Mendes, Ignacio Mateos, H. B. Tu, H. Ward, G. Auger, Miquel Nofrarías, P. Pivato, S. Wen, Tobias Ziegler, P. Sarra, A. Schleicher, A. Bursi, Antonella Cavalleri, S. Waschke, Michele Armano, F. Martin-Porqueras, Oliver Jennrich, Christian J. Killow, R. Maarschalkerweerd, D. Wealthy, A. Wittchen, M. Freschi, J. A. Perez Romera, P. Prat, C. García Marirrodriga, Heather Audley, H. Rozemeijer, Michael Perreur-Lloyd, Ewan Fitzsimons, Ingo Diepholz, Mauro Hueller, Peter Wass, Pierre Binétruy, M. Born, C. Trenkel, M. Caleno, B. Johlander, James Ira Thorpe, A. Moroni, D. I. Robertson, Gudrun Wanner, Juan Ramos-Castro, José F. F. Mendes, Eric Plagnol, V. Martín, Domenico Giardini, N. Dunbar, Catia Grimani, P. Maghami, R. Giusteri, R. Gerndt, Rita Dolesi, Ph. Jetzer, Karsten Danzmann, B. Kaune, S. Madden, Henri Inchauspe, I. Harrison, Davor Mance, D. Texier, J. Gallegos, Ferran Gibert, Luigi Ferraioli, Tamara Sumner, L. l. Gesa, J. Reiche, A. Cesarini, G. Russano, Jacob Slutsky, Valerio Ferroni, Peter Zweifel, U. Ragnit, W. J. Weber, J. Baird, and N. Korsakova

Subjects
History, Astronomy & Astrophysics, Noise (electronics), Education, Physics, Applied, Inertial measurement unit, ddc:530, Aerospace engineering, Konferenzschrift, Dewey Decimal Classification::500 | Naturwissenschaften, Physics, Spacecraft, Gravitational wave, business.industry, Detector, Electrical engineering, Computer Science Applications, Pathfinder, Physics::Space Physics, Measuring instrument, Brownian noise, ddc:500, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, business
Abstract

Thermal Diagnostics experiments to be carried out on board LISA Pathfinder (LPF) will yield a detailed characterisation of how temperature fluctuations affect the LTP (LISA Technology Package) instrument performance, a crucial information for future space based gravitational wave detectors as the proposed eLISA. Amongst them, the study of temperature gradient fluctuations around the test masses of the Inertial Sensors will provide as well information regarding the contribution of the Brownian noise, which is expected to limit the LTP sensitivity at frequencies close to 1mHz during some LTP experiments. In this paper we report on how these kind of Thermal Diagnostics experiments were simulated in the last LPF Simulation Campaign (November, 2013) involving all the LPF Data Analysis team and using an end-to-end simulator of the whole spacecraft. Such simulation campaign was conducted under the framework of the preparation for LPF operations. Spanish Ministry of Science and Innovation (MICINN)/AYA2010-15709

Published
2015
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22. Data series subtraction with unknown and unmodeled background noise

Author

Valerio Ferroni, Oliver Jennrich, Michele Armano, James Ira Thorpe, Nikolaos Karnesis, N. Korsakova, Henri Inchauspe, Paul McNamara, Ingo Diepholz, Ferran Gibert, Stefano Vitale, G. Congedo, Luigi Ferraioli, Eric Plagnol, Heather Audley, W. J. Weber, Daniele Vetrugno, Mauro Hueller, Miquel Nofrarías, Peter Wass, Martin Hewitson, Rita Dolesi, Karsten Danzmann, Department of Physics and INFN, University of Trento [Trento], AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Max-Planck-Gesellschaft, Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux (ARTEMIS), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Centre de Recerca en Sanitat Animal (CReSA), Agence Spatiale Européenne = European Space Agency (ESA), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Agence Spatiale Européenne (ESA), and European Space Agency (ESA)

Subjects
Physics, [PHYS]Physics [physics], Nuclear and High Energy Physics, FOS: Physical sciences, Spectral density, Probability density function, General Relativity and Quantum Cosmology (gr-qc), Residual, General Relativity and Quantum Cosmology, Fast inverse square root, Background noise, Acceleration, Classical mechanics, Astrophysics - Instrumentation and Methods for Astrophysics, Likelihood function, Linear combination, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Instrumentation and Methods for Astrophysics (astro-ph.IM), Algorithm, ComputingMilieux_MISCELLANEOUS
Abstract

LISA Pathfinder (LPF), ESA's precursor mission to a gravitational wave observatory, will measure the degree to which two test-masses can be put into free-fall, aiming to demonstrate a residual relative acceleration with a power spectral density (PSD) below 30 fm/s$^2$/Hz$^{1/2}$ around 1 mHz. In LPF data analysis, the measured relative acceleration data series must be fit to other various measured time series data. This fitting is required in different experiments, from system identification of the test mass and satellite dynamics to the subtraction of noise contributions from measured known disturbances. In all cases, the background noise, described by the PSD of the fit residuals, is expected to be coloured, requiring that we perform such fits in the frequency domain. This PSD is unknown {\it a priori}, and a high accuracy estimate of this residual acceleration noise is an essential output of our analysis. In this paper we present a fitting method based on Bayesian parameter estimation with an unknown frequency-dependent background noise. The method uses noise marginalisation in connection with averaged Welch's periodograms to achieve unbiased parameter estimation, together with a consistent, non-parametric estimate of the residual PSD. Additionally, we find that the method is equivalent to some implementations of iteratively re-weighted least-squares fitting. We have tested the method both on simulated data of known PSD, and to analyze differential acceleration from several experiments with the LISA Pathfinder end-to-end mission simulator., To appear Phys. Rev. D90 August 2014

Published
2014

23. A noise simulator for eLISA: Migrating LISA Pathfinder knowledge to the eLISA mission

Author

Ferran Gibert, Daniele Vetrugno, H. Ward, Peter Wass, P. Pivato, S. Wen, Tobias Ziegler, J. Reiche, J. Gallegos, N. Korsakova, A. Cesarini, G. Russano, Gerhard Heinzel, Michele Armano, Michael Perreur-Lloyd, B. Kaune, Antoine Petiteau, S. Madden, M. Freschi, N. Brandt, Paul McNamara, Luigi Ferraioli, S. Paczkowski, Henri Inchauspe, Peter Zweifel, Nikolaos Karnesis, S. Waschke, A. Moroni, Tamara Sumner, Carlos F. Sopuerta, R. Giusteri, Ph. Jetzer, Christian J. Killow, José F. F. Mendes, U. Ragnit, J. Huesler, Daniele Bortoluzzi, L. Mendes, Ivan Lloro, Ignacio Mateos, Heather Audley, C. García Marirrodriga, P. Sarra, A. Schleicher, I. Harrison, H. B. Tu, Miquel Nofrarías, Pierre Binétruy, Rita Dolesi, Mauro Hueller, B. Johlander, Karsten Danzmann, Davor Mance, W. J. Weber, C. Trenkel, Jacob Slutsky, Valerio Ferroni, N. Dunbar, Catia Grimani, D. Texier, C. Zanoni, D. Wealthy, R. Gerndt, Martin Hewitson, Daniel Hollington, Oliver Jennrich, Ewan Fitzsimons, J. Baird, S. Vitale, Antonella Cavalleri, M. Cruise, P. Prat, A. Bursi, F. Martin-Porqueras, Lluis Gesa, G. Auger, R. Maarschalkerweerd, A. Wittchen, H. Rozemeijer, James Ira Thorpe, Domenico Giardini, J. A. Romera Perez, Eric Plagnol, V. Martín, M. Caleno, D. I. Robertson, Gudrun Wanner, Juan Ramos-Castro, M. Born, Ingo Diepholz, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
History, noise, Astronomy, Residual, Astrophysics, programming, LISA Pathfinder, Education, Physics, Applied, System imperfections, Acceleration, Simulators, numerical methods, State space, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], MATLAB, Instrumental noise, numerical calculations, Simulation, Dewey Decimal Classification::500 | Naturwissenschaften, Konferenzschrift, computer.programming_language, Constellation, Physics, LISA, Spacecraft, business.industry, Noise (signal processing), Computer Science Applications, Pathfinder, Free fall, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], On state, ddc:500, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, Residual acceleration, business, computer, Space probes, performance
Abstract

We present a new technical simulator for the eLISA mission, based on state space modeling techniques and developed in MATLAB. This simulator computes the coordinate and velocity over time of each body involved in the constellation, i.e. the spacecraft and its test masses, taking into account the different disturbances and actuations. This allows studying the contribution of instrumental noises and system imperfections on the residual acceleration applied on the TMs, the latter reflecting the performance of the achieved free-fall along the sensitive axis. A preliminary version of the results is presented. Sorbonne Paris Cite/UnivEarthS Labex French Space Agency (CNES)

Published
2014

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