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1. Tilt-to-length coupling in LISA Pathfinder: A data analysis

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, M. Freschi, L. Gesa, D. Giardini, F. Gibert, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, M-S. Hartig, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, U. Johann, B. Johlander, N. Karnesis, B. Kaune, C. J. Killow, N. Korsakova, J. A. Lobo, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, V. Martín, L. Martin-Polo, F. Martin-Porqueras, J. Martino, P. W. McNamara, J. Mendes, L. Mendes, N. Meshksar, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, E. Plagnol, J. Ramos-Castro, J. Reiche, F. Rivas, D. I. Robertson, G. Russano, J. Sanjuan, J. Slutsky, C. F. Sopuerta, T. Sumner, L. Tevlin, D. Texier, J. I. Thorpe, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2023
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2. Charging of free-falling test masses in orbit due to cosmic rays: Results from LISA Pathfinder

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, M. Freschi, L. Gesa, D. Giardini, F. Gibert, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, M.-S. Hartig, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, N. Karnesis, B. Kaune, C. J. Killow, N. Korsakova, J. A. Lobo, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, V. Martín, J. Martino, L. Martin-Polo, F. Martin-Porqueras, P. W. McNamara, J. Mendes, L. Mendes, N. Meshksar, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, E. Plagnol, J. Ramos-Castro, J. Reiche, F. Rivas, D. I. Robertson, G. Russano, J. Slutsky, C. F. Sopuerta, T. J. Sumner, D. Texier, J. I. Thorpe, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2023
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3. Sensor noise in LISA Pathfinder : An extensive in-flight review of the angular and longitudinal interferometric measurement system

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, N. Brandt, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, R. Flatscher, M. Freschi, A. García, R. Gerndt, L. Gesa, D. Giardini, F. Gibert, R. Giusteri, C. Grimani, J. Grzymisch, F. Guzman, I. Harrison, M-S Hartig, G. Hechenblaikner, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, U. Johann, B. Johlander, N. Karnesis, B. Kaune, C. J. Killow, N. Korsakova, J. A. Lobo, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, V. Martín, L. Martin-Polo, F. Martin-Porqueras, J. Martino, P. W. McNamara, J. Mendes, L. Mendes, N. Meshksar, A. Monsky, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, E. Plagnol, J. Ramos-Castro, J. Reiche, F. Rivas, D. I. Robertson, G. Russano, J. Sanjuan, J. Slutsky, C. F. Sopuerta, F. Steier, T. Sumner, D. Texier, J. I. Thorpe, D. Vetrugno, S. Vitale, V. Wand, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2022
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4. Temperature stability in the sub-milliHertz band with LISA Pathfinder

Author

M Armano, H Audley, J Baird, P Binetruy, M Born, D Bortoluzzi, E Castelli, A Cavalleri, A Cesarini, A M Cruise, K Danzmann, M de Deus Silva, I Diepholz, G Dixon, R Dolesi, L Ferraioli, V Ferroni, E D Fitzsimons, M Freschi, L Gesa, F Gibert, D Giardini, R Giusteri, C Grimani, J Grzymisch, I Harrison, G Heinzel, M Hewitson, D Hollington, D Hoyland, M Hueller, H Inchauspé, O Jennrich, P Jetzer, N Karnesis, B Kaune, N Korsakova, C J Killow, J A Lobo, I Lloro, L Liu, J P López-Zaragoza, R Maarschalkerweerd, D Mance, C Mansanet, V Martín, L Martin-Polo, J Martino, F Martin-Porqueras, I Mateos, P W McNamara, J Mendes, L Mendes, N Meshksar, M Nofrarias, S Paczkowski, M Perreur-Lloyd, A Petiteau, P Pivato, E Plagnol, J Ramos-Castro, J Reiche, D I Robertson, F Rivas, G Russano, J Sanjuán, J Slutsky, C F Sopuerta, T Sumner, D Texier, J I Thorpe, C Trenkel, D Vetrugno, S Vitale, G Wanner, H Ward, P J Wass, D Wealthy, W J Weber, L Wissel, A Wittchen, and P Zweifel

Published
2019
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5. Sensor Noise in LISA Pathfinder : In-Flight Performance of the Optical Test Mass Readout

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, N. Brandt, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, R. Flatscher, M. Freschi, A. García, R. Gerndt, L. Gesa, D. Giardini, F. Gibert, R. Giusteri, C. Grimani, J. Grzymisch, F. Guzman, I. Harrison, M.-S. Hartig, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, U. Johann, B. Johlander, N. Karnesis, B. Kaune, C. J. Killow, N. Korsakova, J. A. Lobo, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, V. Martín, L. Martin-Polo, F. Martin-Porqueras, J. Martino, P. W. McNamara, J. Mendes, L. Mendes, N. Meshksar, A. Monsky, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, J. Ramos-Castro, J. Reiche, F. Rivas, D. I. Robertson, G. Russano, J. Sanjuan, J. Slutsky, C. F. Sopuerta, F. Steier, T. Sumner, D. Texier, J. I. Thorpe, D. Vetrugno, S. Vitale, V. Wand, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2021
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6. Analysis of the Accuracy of Actuation Electronics in the Laser Interferometer Space Antenna Pathfinder

Author

M. Armano, H. Audley, J. Baird, M. Born, D. Bortoluzzi, N. Cardines, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, M. Freschi, L. Gesa, D. Giardini, F. Gibert, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, M.-S. Hartig, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspe, O. Jennrich, P. Jetzer, N. Karnesis, B. Kaune, C. J. Killow, N. Korsakova, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, V. Martin, L. Martin Polo, J. Martino, F. Martin Porqueras, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, N. Meshksar, M. Nofrarias, S. Paczkowski, M. Perreur Lloyd, A. Petiteau, P. Pivato, E. Plagnol, J. Ramos Castro, J. Reiche, F. Rivas, D. I. Robertson, G. Russano, J. Slutsky, C. F. Sopuerta, T. Sumner, D. Texier, J. ten Pierick, J. I. Thorpe, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Subjects
Instrumentation And Photography
Abstract

The Laser Interferometer Space Antenna Pathfinder (LPF) main observable, labelled∆g, is the differential force per unit mass acting on the two test masses in free fall condition, after the contribution of all non-gravitational forces have 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∆g. 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 (ADC) 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 in post-processing the LPF data.

Published
2020
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7. Novel methods to measure the gravitational constant in space

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, M. Freschi, L. Gesa, F. Gibert, D. Giardini, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, M-S Hartig, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, N. Karnesis, B. Kaune, N. Korsakova, C. J. Killow, J. A. Lobo, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, N. Meshksar, V. Martín, L. Martin-Polo, J. Martino, F. Martin-Porqueras, P. W. McNamara, J. Mendes, L. Mendes, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, J. Ramos-Castro, J. Reiche, D. I. Robertson, F. Rivas, G. Russano, J. Slutsky, C. F. Sopuerta, T. Sumner, D. Texier, J. I. Thorpe, C. Trenkel, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2019
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8. LISA Pathfinder Performance Confirmed in an Open-Loop Configuration: Results from the Free-Fall Actuation Mode

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, M. Freschi, L. Gesa, F. Gibert, D. Giardini, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, M-S. Hartig, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, N. Karnesis, B. Kaune, N. Korsakova, C. J. Killow, J. A. Lobo, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, N. Meshksar, V. Martín, L. Martin-Polo, J. Martino, F. Martin-Porqueras, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, J. Ramos-Castro, J. Reiche, D. I. Robertson, F. Rivas, G. Russano, J. Slutsky, C. F. Sopuerta, T. Sumner, D. Texier, J. I. Thorpe, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2019
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9. LISA Pathfinder micronewton cold gas thrusters: In-flight characterization

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, M. Freschi, L. Gesa, F. Gibert, D. Giardini, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, N. Karnesis, B. Kaune, N. Korsakova, C. J. Killow, J. A. Lobo, I. Lloro, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, N. Meshksar, V. Martín, L. Martin-Polo, J. Martino, F. Martin-Porqueras, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, J. Ramos-Castro, J. Reiche, D. I. Robertson, F. Rivas, G. Russano, J. Slutsky, C. F. Sopuerta, T. Sumner, D. Texier, J. I. Thorpe, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2019
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10. LISA Pathfinder platform stability and drag-free performance

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, M. Freschi, L. Gesa, F. Gibert, D. Giardini, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, N. Karnesis, B. Kaune, N. Korsakova, C. J. Killow, J. A. Lobo, I. Lloro, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, N. Meshksar, V. Martín, L. Martin-Polo, J. Martino, F. Martin-Porqueras, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, J. Ramos-Castro, J. Reiche, D. I. Robertson, F. Rivas, G. Russano, J. Slutsky, C. F. Sopuerta, T. Sumner, D. Texier, J. I. Thorpe, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2019
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11. Forbush Decreases and

Author

M Armano, H Audley, J Baird, S Benella, P Binetruy, M Born, D Bortoluzzi, E Castelli, A Cavalleri, A Cesarini, A M Cruise, K Danzmann, M de Deus Silva, I Diepholz, G Dixon, R Dolesi, M Fabi, L Ferraioli, V Ferroni, N Finetti, E D Fitzsimons, M Freschi, L Gesa, F Gibert, D Giardini, R Giusteri, C Grimani, J Grzymisch, I Harrison, G Heinzel, M Hewitson, D Hollington, D Hoyland, M Hueller, H Inchauspé, O Jennrich, P Jetzer, N Karnesis, B Kaune, N Korsakova, C J Killow, K Kudela, M Laurenza, J A Lobo, I Lloro, L Liu, J P López-Zaragoza, R Maarschalkerweerd, D Mance, N Meshksar, V Martín, L Martin-Polo, J Martino, F Martin-Porqueras, I Mateos, P W McNamara, J Mendes, L Mendes, M Nofrarias, S Paczkowski, M Perreur-Lloyd, A Petiteau, P Pivato, E Plagnol, J Ramos-Castro, J Reiche, D I Robertson, F Rivas, G Russano, J Slutsky, C F Sopuerta, T Sumner, D Telloni, D Texier, J I Thorpe, D Vetrugno, M Villani, S Vitale, G Wanner, H Ward, P Wass, W J Weber, L Wissel, A Wittchen, and P Zweifel

Subjects
Astronomy
Abstract

Non-recurrent short-term variations of the galactic cosmic-ray (GCR) flux above 70 MeV n(exp −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 × 10 (exp 6) 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(exp −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 <2 days and their association with interplanetary structures are investigated. It is found that, most likely, plasma compression regions between subsequent corotating high-speed streams cause peaks, while heliospheric current sheet crossing causes the majority of the depressions.

Published
2019
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12. Experimental results from the ST7 mission on LISA Pathfinder

Author

G. Anderson, J. Anderson, M. Anderson, G. Aveni, D. Bame, P. Barela, K. Blackman, A. Carmain, L. Chen, M. Cherng, S. Clark, M. Connally, W. Connolly, D. Conroy, M. Cooper, C. Cutler, J. D’Agostino, N. Demmons, E. Dorantes, C. Dunn, M. Duran, E. Ehrbar, J. Evans, J. Fernandez, G. Franklin, M. Girard, J. Gorelik, V. Hruby, O. Hsu, D. Jackson, S. Javidnia, D. Kern, M. Knopp, R. Kolasinski, C. Kuo, T. Le, I. Li, O. Liepack, A. Littlefield, P. Maghami, S. Malik, L. Markley, R. Martin, C. Marrese-Reading, J. Mehta, J. Mennela, D. Miller, D. Nguyen, J. O’Donnell, R. Parikh, G. Plett, T. Ramsey, T. Randolph, S. Rhodes, A. Romero-Wolf, T. Roy, A. Ruiz, H. Shaw, J. Slutsky, D. Spence, J. Stocky, J. Tallon, I. Thorpe, W. Tolman, H. Umfress, R. Valencia, C. Valerio, W. Warner, J. Wellman, P. Willis, J. Ziemer, J. Zwahlen, M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, M. Freschi, L. Gesa, F. Gibert, D. Giardini, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, N. Karnesis, B. Kaune, N. Korsakova, C. J. Killow, J. A. Lobo, I. Lloro, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, N. Meshksar, V. Martín, L. Martin-Polo, J. Martino, F. Martin-Porqueras, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, J. Ramos-Castro, J. Reiche, D. I. Robertson, F. Rivas, G. Russano, C. F. Sopuerta, T. Sumner, D. Texier, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2018
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13. Precision charge control for isolated free-falling test masses: LISA pathfinder results

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, M. Freschi, L. Gesa, D. Giardini, F. Gibert, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, N. Karnesis, B. Kaune, N. Korsakova, C. J. Killow, L. Liu, I. Lloro, J. A. Lobo, J. P. López-Zaragoza, R. Maarschalkerweerd, F. Mailland, D. Mance, V. Martín, L. Martin-Polo, F. Martin-Porqueras, J. Martino, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, N. Meshskar, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, M. Pfeil, P. Pivato, E. Plagnol, J. Ramos-Castro, J. Reiche, D. I. Robertson, F. Rivas, G. Russano, G. Santoruvo, P. Sarra, D. Shaul, J. Slutsky, C. F. Sopuerta, T. Sumner, D. Texier, J. I. Thorpe, C. Trenkel, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, S. Waschke, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2018
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14. Calibrating the system dynamics of LISA Pathfinder

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, M. Freschi, L. Gesa, F. Gibert, D. Giardini, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, N. Karnesis, B. Kaune, N. Korsakova, C. J. Killow, J. A. Lobo, I. Lloro, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, N. Meshksar, V. Martín, L. Martin-Polo, J. Martino, F. Martin-Porqueras, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, J. Ramos-Castro, J. Reiche, D. I. Robertson, F. Rivas, G. Russano, J. Slutsky, C. F. Sopuerta, T. Sumner, D. Texier, J. I. Thorpe, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2018
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15. Beyond the Required LISA Free-Fall Performance: New LISA Pathfinder Results down to 20 μHz

Author

M. Armano, H. Audley, J. Baird, P. Binetruy, M. Born, D. Bortoluzzi, E. Castelli, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, G. Dixon, R. Dolesi, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, M. Freschi, L. Gesa, F. Gibert, D. Giardini, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, N. Karnesis, B. Kaune, N. Korsakova, C. J. Killow, J. A. Lobo, I. Lloro, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, N. Meshksar, V. Martín, L. Martin-Polo, J. Martino, F. Martin-Porqueras, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, J. Ramos-Castro, J. Reiche, D. I. Robertson, F. Rivas, G. Russano, J. Slutsky, C. F. Sopuerta, T. Sumner, D. Texier, J. I. Thorpe, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, W. J. Weber, L. Wissel, A. Wittchen, and P. Zweifel

Published
2018
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16. Capacitive sensing of test mass motion with nanometer precision over millimeter-wide sensing gaps for space-borne gravitational reference sensors

Author

M. Armano, H. Audley, G. Auger, J. Baird, M. Bassan, P. Binetruy, M. Born, D. Bortoluzzi, N. Brandt, M. Caleno, A. Cavalleri, A. Cesarini, A. M. Cruise, K. Danzmann, M. de Deus Silva, R. De Rosa, L. Di Fiore, I. Diepholz, G. Dixon, R. Dolesi, N. Dunbar, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, R. Flatscher, M. Freschi, C. García Marirrodriga, R. Gerndt, L. Gesa, F. Gibert, D. Giardini, R. Giusteri, A. Grado, C. Grimani, J. Grzymisch, I. Harrison, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, B. Johlander, N. Karnesis, B. Kaune, N. Korsakova, C. J. Killow, J. A. Lobo, I. Lloro, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, V. Martín, L. Martin-Polo, J. Martino, F. Martin-Porqueras, S. Madden, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, N. Meshksar, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, P. Prat, U. Ragnit, J. Ramos-Castro, J. Reiche, D. I. Robertson, H. Rozemeijer, F. Rivas, G. Russano, P. Sarra, A. Schleicher, J. Slutsky, C. F. Sopuerta, R. Stanga, T. J. Sumner, D. Texier, J. I. Thorpe, C. Trenkel, M. Tröbs, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, D. Wealthy, W. J. Weber, L. Wissel, A. Wittchen, A. Zambotti, C. Zanoni, T. Ziegler, and P. Zweifel

Published
2017
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17. Charge-Induced Force Noise on Free-Falling Test Masses: Results from LISA Pathfinder

Author

M. Armano, H. Audley, G. Auger, J. T. Baird, P. Binetruy, M. Born, D. Bortoluzzi, N. Brandt, A. Bursi, M. Caleno, A. Cavalleri, A. Cesarini, M. Cruise, K. Danzmann, M. de Deus Silva, I. Diepholz, R. Dolesi, N. Dunbar, L. Ferraioli, V. Ferroni, E. D. Fitzsimons, R. Flatscher, M. Freschi, J. Gallegos, C. García Marirrodriga, R. Gerndt, L. Gesa, F. Gibert, D. Giardini, R. Giusteri, C. Grimani, J. Grzymisch, I. Harrison, G. Heinzel, M. Hewitson, D. Hollington, M. Hueller, J. Huesler, H. Inchauspé, O. Jennrich, P. Jetzer, B. Johlander, N. Karnesis, B. Kaune, C. J. Killow, N. Korsakova, I. Lloro, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, S. Madden, D. Mance, V. Martín, L. Martin-Polo, J. Martino, F. Martin-Porqueras, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, A. Moroni, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, P. Prat, U. Ragnit, J. Ramos-Castro, J. Reiche, J. A. Romera Perez, D. I. Robertson, H. Rozemeijer, F. Rivas, G. Russano, P. Sarra, A. Schleicher, J. Slutsky, C. Sopuerta, T. J. Sumner, D. Texier, J. I. Thorpe, C. Trenkel, D. Vetrugno, S. Vitale, G. Wanner, H. Ward, P. J. Wass, D. Wealthy, W. J. Weber, A. Wittchen, C. Zanoni, T. Ziegler, and P. Zweifel

Published
2017
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18. Sub-Femto-gFree Fall for Space-Based Gravitational Wave Observatories: LISA Pathfinder Results

Author

M. Armano, H. Audley, G. Auger, J. T. Baird, M. Bassan, P. Binetruy, M. Born, D. Bortoluzzi, N. Brandt, M. Caleno, L. Carbone, A. Cavalleri, A. Cesarini, G. Ciani, G. Congedo, A. M. Cruise, K. Danzmann, M. de Deus Silva, R. De Rosa, M. Diaz-Aguiló, L. Di Fiore, I. Diepholz, G. Dixon, R. Dolesi, N. Dunbar, L. Ferraioli, V. Ferroni, W. Fichter, E. D. Fitzsimons, R. Flatscher, M. Freschi, A. F. García Marín, C. García Marirrodriga, R. Gerndt, L. Gesa, F. Gibert, D. Giardini, R. Giusteri, F. Guzmán, A. Grado, C. Grimani, A. Grynagier, J. Grzymisch, I. Harrison, G. Heinzel, M. Hewitson, D. Hollington, D. Hoyland, M. Hueller, H. Inchauspé, O. Jennrich, P. Jetzer, U. Johann, B. Johlander, N. Karnesis, B. Kaune, N. Korsakova, C. J. Killow, J. A. Lobo, I. Lloro, L. Liu, J. P. López-Zaragoza, R. Maarschalkerweerd, D. Mance, V. Martín, L. Martin-Polo, J. Martino, F. Martin-Porqueras, S. Madden, I. Mateos, P. W. McNamara, J. Mendes, L. Mendes, A. Monsky, D. Nicolodi, M. Nofrarias, S. Paczkowski, M. Perreur-Lloyd, A. Petiteau, P. Pivato, E. Plagnol, P. Prat, U. Ragnit, B. Raïs, J. Ramos-Castro, J. Reiche, D. I. Robertson, H. Rozemeijer, F. Rivas, G. Russano, J. Sanjuán, P. Sarra, A. Schleicher, D. Shaul, J. Slutsky, C. F. Sopuerta, R. Stanga, F. Steier, T. Sumner, D. Texier, J. I. Thorpe, C. Trenkel, M. Tröbs, H. B. Tu, D. Vetrugno, S. Vitale, V. Wand, G. Wanner, H. Ward, C. Warren, P. J. Wass, D. Wealthy, W. J. Weber, L. Wissel, A. Wittchen, A. Zambotti, C. Zanoni, T. Ziegler, and P. Zweifel

Published
2016
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19. 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

21. 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

22. 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

23. 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

24. 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

25. 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

26. 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

27. 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

28. 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

29. 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

31. Measuring fN force variations in the presence of constant nN forces: a torsion pendulum ground test of the LISA Pathfinder free-fall mode

Author

H. B. Tu, Daniele Vetrugno, S. Vitale, P. Pivato, R. Giusteri, M. Hueller, Rita Dolesi, Antonella Cavalleri, Valerio Ferroni, Ferran Gibert, W. J. Weber, A. Cesarini, G. Russano, and L. Liu

Subjects
Physics, Pathfinder, 010504 meteorology & atmospheric sciences, Physics and Astronomy (miscellaneous), Torsion pendulum clock, 0103 physical sciences, Mode (statistics), Mechanics, 010306 general physics, Constant (mathematics), 01 natural sciences, 0105 earth and related environmental sciences
Published
2018

32. Disentangling the magnetic force noise contribution in LISA Pathfinder

Author

M Armano, H Audley, G Auger, J Baird, P Binetruy, M Born, D Bortoluzzi, N Brandt, A Bursi, M Caleno, A Cavalleri, A Cesarini, M Cruise, K Danzmann, I Diepholz, R Dolesi, N Dunbar, L Ferraioli, V Ferroni, E Fitzsimons, M Freschi, J Gallegos, C García Marirrodriga, R Gerndt, LI Gesa, F Gibert, D Giardini, R Giusteri, C Grimani, I Harrison, G Heinzel, M Hewitson, D Hollington, M Hueller, J Huesler, H Inchauspé, O Jennrich, P Jetzer, B Johlander, N Karnesis, B Kaune, N Korsakova, C Killow, I Lloro, R Maarschalkerweerd, S Madden, D Mance, V Martín, F Martin-Porqueras, I Mateos, P McNamara, J Mendes, L Mendes, A Moroni, M Nofrarias, S Paczkowski, M Perreur-Lloyd, A Petiteau, P Pivato, E Plagnol, P Prat, U Ragnit, J Ramos-Castro, J Reiche, J A Romera Perez, D Robertson, H Rozemeijer, G Russano, P Sarra, A Schleicher, J Slutsky, C F Sopuerta, T Sumner, D Texier, J Thorpe, C Trenkel, H B Tu, D Vetrugno, S Vitale, G Wanner, H Ward, S Waschke, P Wass, D Wealthy, S Wen, W Weber, A Wittchen, C Zanoni, T Ziegler, and P Zweifel

Subjects
History, Magnetometer, Astronomy, Astrophysics, 01 natural sciences, LISA Pathfinder, Displacement (vector), Physics, Applied, Education, law.invention, Magnetization, law, 0103 physical sciences, ddc:530, 010303 astronomy & astrophysics, Konferenzschrift, Dewey Decimal Classification::500 | Naturwissenschaften, Physics, 010308 nuclear & particles physics, business.industry, Electrical engineering, Computer Science Applications, Computational physics, Magnetic field, Coupling (physics), Pathfinder, ddc:500, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, business, Excitation, Noise (radio)
Abstract

Magnetically-induced forces on the inertial masses on-board LISA Pathfinder are expected to be one of the dominant contributions to the mission noise budget, accounting for up to 40%. The origin of this disturbance is the coupling of the residual magnetization and susceptibility of the test masses with the environmental magnetic field. In order to fully understand this important part of the noise model, a set of coils and magnetometers are integrated as a part of the diagnostics subsystem. During operations a sequence of magnetic excitations will be applied to precisely determine the coupling of the magnetic environment to the test mass displacement using the on-board magnetometers. Since no direct measurement of the magnetic field in the test mass position will be available, an extrapolation of the magnetic measurements to the test mass position will be carried out as a part of the data analysis activities. In this paper we show the first results on the magnetic experiments during an end-to-end LISA Pathfinder simulation, and we describe the methods under development to map the magnetic field on-board. A post-publication change was made to this article on 26 Jun 2020 to add an author.

Published
2015

33. Measuring the LISA test mass magnetic properties with a torsion pendulum

Author

Rita Dolesi, C. D. Hoyle, M. Hueller, Antonella Cavalleri, Michele Armano, L. Carbone, Stefano Vitale, and W. J. Weber

Subjects
Physics, Physics and Astronomy (miscellaneous), FORCE NOISE, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Low frequency, Magnetic susceptibility, General Relativity and Quantum Cosmology, Magnetic field, Dipole, Interferometry, Quantum electrodynamics, Torsion pendulum clock, Physics::Space Physics, Moment (physics), Sensitivity (control systems)
Abstract

Achieving the low frequency LISA sensitivity requires that the test masses acting as the interferometer end mirrors are free-falling with an unprecedented small degree of deviation. Magnetic disturbances, originating in the interaction of the test mass with the environmental magnetic field, can significantly deteriorate the LISA performance and can be parameterized through the test mass remnant dipole moment $\vec{m}_r$ and the magnetic susceptibility $\chi$. While the LISA test flight precursor LTP will investigate these effects during the preliminary phases of the mission, the very stringent requirements on the test mass magnetic cleanliness make ground-based characterization of its magnetic proprieties paramount. We propose a torsion pendulum technique to accurately measure on ground the magnetic proprieties of the LISA/LTP test masses., Comment: 6 pages, 3 figures

Published
2005

34. Bayesian statistics for the calibration of the LISA Pathfinder experiment

Author

M Armano, H Audley, G Auger, P Binetruy, M Born, D Bortoluzzi, N Brandt, A Bursi, M Caleno, A Cavalleri, A Cesarini, M Cruise, K Danzmann, I Diepholz, R Dolesi, N Dunbar, L Ferraioli, V Ferroni, E Fitzsimons, M Freschi, C García Marirrodriga, R Gerndt, L Gesa, F Gibert, D Giardini, R Giusteri, C Grimani, I Harrison, G Heinzel, M Hewitson, D Hollington, M Hueller, J Huesler, H Inchauspé, O Jennrich, P Jetzer, B Johlander, N Karnesis, B Kaune, N Korsakova, C Killow, I Lloro, R Maarschalkerweerd, S Madden, D Mance, V Martin, F Martin-Porqueras, I Mateos, P McNamara, J Mendes, E Mitchell, A Moroni, M Nofrarias, S Paczkowski, M Perreur-Lloyd, P Pivato, E Plagnol, P Prat, U Ragnit, J Ramos-Castro, J Reiche, J A Romera Perez, D Robertson, H Rozemeijer, G Russano, P Sarra, A Schleicher, J Slutsky, C F Sopuerta, T Sumner, D Texier, J Thorpe, C Trenkel, H B Tu, D Vetrugno, S Vitale, G Wanner, H Ward, S Waschke, P Wass, D Wealthy, S Wen, W Weber, A Wittchen, C Zanoni, T Ziegler, P Zweifel, 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), 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), 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
History, MATLAB, detector: satellite, Calibration (statistics), Astronomy, Bayesian probability, Lisa technology packages, Gravity waves, computer.software_genre, Astrophysics, Bayesian statistics, 01 natural sciences, Degrees of freedom (mechanics), LISA Pathfinder, Education, Physics, Applied, Gravitational wave detectors, Theoretical physics, Matlab toolboxes, Operational simulations, 0103 physical sciences, numerical methods, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], noise: acceleration, 010306 general physics, Dewey Decimal Classification::500 | Naturwissenschaften, Konferenzschrift, Mathematics, Data processing, 010308 nuclear & particles physics, Design of experiments, System identification, statistical analysis: Bayesian, Analysis strategies, gravitational radiation detector, Computer Science Applications, Pathfinder, LISA: calibration, gravitational radiation: emission, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Bayesian Analysis, Noise (video), Data mining, ddc:500, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, computer, Space probes
Abstract

The main goal of LISA Pathfinder (LPF) mission is to estimate the acceleration noise models of the overall LISA Technology Package (LTP) experiment on-board. This will be of crucial importance for the future space-based Gravitational-Wave (GW) detectors, like eLISA. Here, we present the Bayesian analysis framework to process the planned system identification experiments designed for that purpose. In particular, we focus on the analysis strategies to predict the accuracy of the parameters that describe the system in all degrees of freedom. The data sets were generated during the latest operational simulations organised by the data analysis team and this work is part of the LTPDA Matlab toolbox. A post-publication change was made to this article on 26 Jun 2020 to add an author.

Published
2014

36. The LISA Pathfinder Mission

Author

Ivan Lloro, G. Russano, Gerhard Heinzel, C. García Marirrodriga, J. Reiche, Matteo Benedetti, S. Madden, J. Bogenstahl, Víctor S. Martín, M. Caleno, H. B. Tu, P. Prat, Peter Zweifel, M. Hueller, Ph. Jetzer, E. Mitchell, N. Dumbar, Heather Audley, D. Wealthy, José F. F. Mendes, X. Llamas, H. Ward, J. A. Romera Perez, M. Cruise, C. Trenkel, Stefano Vitale, A. Grynagier, Ignacio Mateos, Karsten Danzmann, Eric Plagnol, M. Diaz-Aguilo, Oliver Jennrich, Daniele Bortoluzzi, W. J. Weber, Paul McNamara, T. J. Sumner, Christian J. Killow, Domenico Giardini, Martin Hewitson, A. Lobo, Walter Fichter, Daniel Hollington, Valerio Ferroni, G. Dixton, Carlos F. Sopuerta, Miquel Nofrarías, Antonella Cavalleri, Felipe Guzman, D. Hoyland, Davor Mance, David Robertson, G. Congedo, Luigi Ferraioli, N. Korsakova, Michael Perreur-Lloyd, Ewan Fitzsimons, Ingo Diepholz, Alexander Schleicher, D. Texier, N. Brandt, A.M. Taylor, F. De Marchi, Rita Dolesi, Daniele Nicolodi, Gudrun Wanner, Juan Ramos-Castro, Ferran Gibert, R. Gerndt, Tobias Ziegler, Michele Armano, F. Antonucci, M. Freschi, Catia Grimani, S. Wen, J. Huesler, B. Johlander, Ian Harrison, S. Waschke, Peter Wass, N. Karnesis, Pierre Binétruy, Lluis Gesa, G. Auger, R. Maarschalkerweerd, H. Rozemeijer, D. Shaul, and J. Fauste

Subjects
Physics, Gravitational wave, business.industry, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Propulsion, Space exploration, Metrology, Gravitation, Pathfinder, Optics, Space and Planetary Science, Inertial measurement unit, Physics::Space Physics, Astrophysics::Earth and Planetary Astrophysics, Aerospace engineering, business, Mathematical Physics
Abstract

LISA Pathfinder (formerly known as SMART-2) is an European Space Agency mission designed to pave the way for the joint ESA/NASA Laser Interferometer Space Antenna (LISA) mission by testing in flight the critical technologies required for space-borne gravitational wave detection; it will put two test masses in a near-perfect gravitational free-fall and control and measure their motion with unprecedented accuracy. This is achieved through technology comprising inertial sensors, high precision laser metrology, drag-free control, and an ultra precise micro-Newton propulsion system. LISA Pathfinder (LPF) essentially mimics one arm of spaceborne gravitational wave detectors by shrinking the million kilometre scale armlengths down to a few tens of centimetres, giving up the sensitivity to gravitational waves, but keeping the measurement technology. The scientific objective of the LISA Pathfinder mission consists then of the first in-flight test of low frequency gravitational wave detection metrology. In this paper I will give a brief overview of the mission, focusing on scientific and technical goals.

Published
2013

37. Quantitative analysis of LISA pathfinder test-mass noise

Author

M. Hueller, Martin Hewitson, G. Congedo, Luigi Ferraioli, Michele Armano, Miquel Nofrarías, and Stefano Vitale

Subjects
Physics, Nuclear and High Energy Physics, Noise measurement, Estimation theory, Gaussian, Estimator, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), General Relativity and Quantum Cosmology, Synthetic data, symbols.namesake, Theoretical physics, Goodness of fit, Gaussian noise, Physics - Data Analysis, Statistics and Probability, Test statistic, symbols, Algorithm, Data Analysis, Statistics and Probability (physics.data-an)
Abstract

In this paper we discuss two main problems associated with the analysis of the data from LISA Pathfinder (LPF): i) Excess noise detection and ii) Noise parameter identification. The mission is focused on the low frequency region ([0.1; 10] mHz) of the available signal spectrum. In such a region the signal is dominated by the force noise acting on test masses. Noise analysis is expected to deal with a limited amount of non-Gaussian data, since the spectrum statistics will be far from Gaussian and the lowest available frequency is limited by the data length. In this paper we analyze the details of the expected statistics for spectral data and develop two suitable excess noise estimators. One is based on the statistical properties of the integrated spectrum, the other is based on Kolmogorov-Smirnov test. The sensitivity of the estimators is discussed theoretically for independent data, then the algorithms are tested on LPF synthetic data. The test on realistic LPF data allows the effect of spectral data correlations on the efficiency of the different noise excess estimators to be highlighted. It also reveals the versatility of the Kolmogorov-Smirnov approach, which can be adapted to provide reasonable results on correlated data from a modified version of the standard equations for the inversion of the test statistic. Closely related to excess noise detection, the problem of noise parameter identification in non-Gaussian data is approached in two ways. One procedure is based on maximum likelihood estimator and another is based on the Kolmogorov-Smirnov goodness of fit estimator. Both approaches provide unbiased and accurate results for noise parameter estimation and demonstrate superior performance with respect to standard weighted least-squares and Huber's norm., Comment: Accepted for publication in Phys Rev D

Published
2011

38. From laboratory experiments to LISA Pathfinder: achieving LISA geodesic motion

Author

F Antonucci, M Armano, H Audley, G Auger, M Benedetti, P Binetruy, C Boatella, J Bogenstahl, D Bortoluzzi, P Bosetti, N Brandt, M Caleno, A Cavalleri, M Cesa, M Chmeissani, G Ciani, A Conchillo, G Congedo, I Cristofolini, M Cruise, K Danzmann, F De Marchi, M Diaz-Aguilo, I Diepholz, G Dixon, R Dolesi, N Dunbar, J Fauste, L Ferraioli, D Fertin, W Fichter, E Fitzsimons, M Freschi, A García Marin, C García Marirrodriga, R Gerndt, L Gesa, D Giardini, F Gibert, C Grimani, A Grynagier, B Guillaume, F Guzmán, I Harrison, G Heinzel, M Hewitson, D Hollington, J Hough, D Hoyland, M Hueller, J Huesler, O Jeannin, O Jennrich, P Jetzer, B Johlander, C Killow, X Llamas, I Lloro, A Lobo, R Maarschalkerweerd, S Madden, D Mance, I Mateos, P W McNamara, J Mendes, E Mitchell, A Monsky, D Nicolini, D Nicolodi, M Nofrarias, F Pedersen, M Perreur-Lloyd, A Perreca, E Plagnol, P Prat, G D Racca, B Rais, J Ramos-Castro, J Reiche, J A Romera Perez, D Robertson, H Rozemeijer, J Sanjuan, A Schleicher, M Schulte, D Shaul, L Stagnaro, S Strandmoe, F Steier, T J Sumner, A Taylor, D Texier, C Trenkel, D Tombolato, S Vitale, G Wanner, H Ward, S Waschke, P Wass, W J Weber, P Zweifel, Science and Technology Facilities Council (STFC), Gruppo Collegato di Trento, Istituto Nazionale di Fisica Nucleare (INFN), European Space Astronomy Centre (ESAC), European Space Agency (ESA), Max-Planck-Institut für Gravitationsphysik ( Albert-Einstein-Institut ) (AEI), Max-Planck-Gesellschaft, 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), DCT / AQ / EC, Centre National d'Études Spatiales [Toulouse] (CNES), Astrium GmbH, European Space Technology Centre, Institut de Física d’Altes Energies [Barcelone] (IFAE), Universitat Autònoma de Barcelona (UAB), Department of Physics [Gainesville] (UF|Physics), University of Florida [Gainesville] (UF), Facultat de Ciències, Institut d'Estudis Espacials de Catalunya (IEEC-CSIC), School of Physics and Astronomy [Birmingham], University of Birmingham [Birmingham], EPSC, Astrium Ltd, Institut für Flugmechanik und Flugregelung, SUPA School of Physics and Astronomy [Glasgow], University of Glasgow, Institut für Geophysik [Zürich], Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Istituto di Fisica, NASA, European Space Operations Centre, Blackett Laboratory, Imperial College London, Dipartimento di Fisica, INFN, Gruppo Collegato di Trento, Institut für Theoretische Physik, Universität Zürich [Zürich] = University of Zurich (UZH), NTE-SENER, Departament d'Enginyeria Electrònica [Barcelona], APC - Cosmologie, 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)-Observatoire de Paris, APC - THEORIE, 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)-Institut für theoretische Physik, Universität Hamburg (UHH)-Universität Hamburg (UHH), LISA, 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)-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)-Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Centre National de la Recherche Scientifique (CNRS), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut für theoretische Physik, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), National Institute for Nuclear Physics (INFN), Universitat Autònoma de Barcelona [Barcelona] (UAB), Department of Physics [Gainesville], University of Florida [Gainesville], Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology in Zürich [Zürich] (ETH Zürich), Universität Zürich [Zürich] (UZH), Agence Spatiale Européenne = European Space Agency (ESA), 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 European Space Research and Technology Centre (ESTEC)

Subjects
Ground testing, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Geodesic, Physics and Astronomy (miscellaneous), [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), 01 natural sciences, Motion (physics), General Relativity and Quantum Cosmology, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Acceleration, 0103 physical sciences, Quantitative assessment, Aerospace engineering, ASTRONOMY & ASTROPHYSICS, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), 01 Mathematical Sciences, MISSION, Physics, Science & Technology, PHYSICS, MULTIDISCIPLINARY, 02 Physical Sciences, 010308 nuclear & particles physics, business.industry, PHYSICS, PARTICLES & FIELDS, Nuclear & Particles Physics, Noise, Pathfinder, Physical Sciences, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], business, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

This paper presents a quantitative assessment of the performance of the upcoming LISA Pathfinder geodesic explorer mission. The findings are based on the results of extensive ground testing and simulation campaigns using flight hardware and flight control and operations algorithms. The results show that, for the central experiment of measuring the stray differential acceleration between the LISA test masses, LISA Pathfinder will be able to verify the overall acceleration noise to within a factor two of the LISA requirement at 1 mHz and within a factor 6 at 0.1 mHz. We also discuss the key elements of the physical model of disturbances, coming from LISA Pathfinder and ground measurement, that will guarantee the LISA performance., Proceedings of the 8th LISA Symposium. To appear Class. Quantum Grav. 28 (2011)

Published
2011

39. The first mock data challenge for LISA Pathfinder

Author

A. Monsky, M. Hewitson, L. Ferraioli, G. Wanner, M. Nofrarias, M. Hueller, I. Diepholz, A. Grynagier, M. Armano, M. Benedetti, J. Bogenstahl, D. Bortoluzzi, P. Bosetti, N. Brandt, A. Cavalleri, G. Ciani, I. Cristofolini, M. Cruise, K. Danzmann, and R. Dolesi

Abstract

The data analysis of the LISA Technology Package (LTP) will comprise a series of discrete experiments, each focusing on a particular noise measurement or characterization of the instrument in various operating modes. Each of these experiments must be analysed and planned in advance of the mission because the results of a given experiment will have an impact on those that follow. As such, a series of mock data challenges (MDCs) will be developed and carried out with the aim of preparing the analysis tools and optimizing the various planned analyses. The first of these MDCs (MDC1) is a simplified treatment of the dynamics along the axis joining the two test masses onboard LISA Pathfinder. The validation of the dynamical model by predicting the spectra of the interferometer output data is shown, a prediction for the data analysis is calculated and, finally, several simulated interferometer data sets are analysed and calibrated to equivalent out-of-loop test mass acceleration

Published
2009

42. Ground based 2 DoF test for LISA and LISA pathfinder: A status report

Author

Catia Grimani, A. Viceré, Ludovico Carbone, Francesco Santoli, W. J. Weber, L. Marconi, Giuseppe Pucacco, Ruggero Stanga, Sergio Nozzoli, Valerio Iafolla, M. Hueller, F. Vetrano, Rita Dolesi, Antonella Cavalleri, and S. Vitale

Subjects
Gravitation, Physics, Classical mechanics, Pathfinder, Spacecraft, Position (vector), business.industry, Torsion pendulum clock, Degrees of freedom, Aerospace engineering, Status report, business, Test (assessment)
Abstract

On‐ground tests are required to study the couplings between LISA test masses and the spacecraft that host them. In order to study couplings that might act between two ore more degrees of freedom in measuring the position and acting on the position of each test mass, a many degrees of freedom facility is needed. Here we present the status of our new 2 DoF double torsion pendulum, that will be used to test LISA Gravitational Reference Sensor (GRS) on the ground.

Published
2006

43. SPACE DETECTION OF GRAVITATIONAL WAVES (LISA)

Author

M. Hueller, A. Cavalleri, J. Turneaure, Karsten Danzmann, R. Doles, Giorgio Fontana, W. Webe, C. Ungarell, S. Sigurdsso, Saps Buchman, S. Vital, A. Vecchi, J. C. Neves de Araujo, and J. Hanso

Subjects
Physics, Atom interferometer, Gravitational-wave observatory, Gravitational wave, Astronomy, Astrophysics, Space (mathematics), Gravitational redshift
Published
2002

44. Testing of the UV discharge system for LISA pathfinder

Author

Peter Wass, Tamara Sumner, Giacomo Ciani, W. J. Weber, S. Vitale, D. Tombolato, G. K. Rochester, Antonella Cavalleri, M. Hueller, Rita Dolesi, C. Trenkel, M. Schulte, and L. Carbone

Subjects
Physics, Pathfinder, Optics, Optical testing, business.industry, Torsion pendulum clock, Photoelectric effect, business, Charged particle, Noise (radio)
Abstract

We present the results of tests that demonstrate the functionality and performance of the test‐mass discharge system for LISA and LISA Pathfinder. In space, the LISA and LISA Pathfinder test‐masses will accumulate charge from energetic charged particles. Using the photoelectric effect, a system of ultra‐violet (UV) illumination will discharge the test masses. Testing of this UV discharge system, integrated with the LISA Pathfinder engineering model sensor in the torsion pendulum facility at the University of Trento has shown that: isolated test‐masses can be charged positively or negatively using UV light; the rate of charging can be measured and is proportional to the UV power; the test‐mass charge can be continuously held near zero with a combination of light illuminating the test mass and the surrounding sensor housing, without introducing excess force noise above the pendulum detection limit.

46. Measuring fN force variations in the presence of constant nN forces: a torsion pendulum ground test of the LISA Pathfinder free-fall mode.

Author

G Russano, A Cavalleri, A Cesarini, R Dolesi, V Ferroni, F Gibert, R Giusteri, M Hueller, L Liu, P Pivato, H B Tu, D Vetrugno, S Vitale, and W J Weber

Subjects
GRAVITATIONAL waves, ACCELEROMETERS, NOISE generators (Electronics)
Abstract

LISA Pathfinder is a differential accelerometer with the main goal being to demonstrate the near perfect free-fall of reference test masses, as is needed for an orbiting gravitational wave observatory, with a target sensitivity of 30 fm s−2 at 1 mHz. Any lasting background differential acceleration between the two test masses must be actively compensated, and noise associated with the applied actuation force can be a dominant source of noise. To remove this actuation, and the associated force noise, a ‘free-fall’ actuation control scheme has been designed; actuation is limited to brief impulses, with both test masses in free-fall in the time between the impulses, allowing measurement of the remaining acceleration noise sources. In this work, we present an on-ground torsion pendulum testing campaign of this technique and associated data analysis algorithms at a level nearing the sub-femto-g/ performance required for LISA Pathfinder. [ABSTRACT FROM AUTHOR]

Published
2018
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48. Direct force measurements for testing the LISA Pathfinder gravitational reference sensor.

Author

A Cavalleri, G Ciani, R Dolesi, M Hueller, D Nicolodi, D Tombolato, P J Wass, W J Weber, S Vitale, and L Carbone

Subjects
FORCE & energy, PHYSICAL measurements, AEROSPACE engineering, LASER interferometry, ANTENNAS (Electronics), SPACE exploration, OUTER space
Abstract

We present results of testing of the LISA Pathfinder gravitational reference sensor (GRS) using a 4-test-mass torsion pendulum facility aimed at measuring low-frequency force-noise sources in the LISA and LISA Pathfinder frequency band. This pendulum, for the first time, allows us to make measurements which are sensitive to all forces acting along the sensitive axis of the test mass, not only those that create a torque. We will report on a campaign of testing using the LISA Pathfinder 'engineering model' prototype GRS which has set upper limits on the overall force noise acting on the test mass contributed by surface effects within the sensor at a level of 100 fN Hz[?]1/2 at 2 mHz and measured specific sources of unwanted disturbances. These sources include forces arising from the electrostatic coupling between the sensor and test-mass motion, electrostatic fields due to surface-potential variations and thermal-gradient effects within the sensor. Finally, we describe the extension of this campaign to the LISA Pathfinder flight-model replica GRS which will be crucial in verifying the design and performance of the flight instrument. [ABSTRACT FROM AUTHOR]

Published
2009
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49. A new torsion pendulum for testing the limits of free-fall for LISA test masses.

Author

A Cavalleri, G Ciani, R Dolesi, A Heptonstall, M Hueller, D Nicolodi, S Rowan, D Tombolato, S Vitale, P J Wass, and W J Weber

Subjects
TORSION pendulums, AEROSPACE engineering, ANTENNAS (Electronics), SENSITIVITY analysis, TUNGSTEN, SPACE exploration, OUTER space
Abstract

On-ground verification of the precision with which a test mass can be in perfect free-fall, without any stray forces, is among the most challenging aspects of preparing for LISA and LISA Pathfinder. This study aims at improving the sensitivity in torsion pendulum measurements of the stray forces arising in the interaction between a test mass and the capacitive position sensor that surrounds it. Measurements are performed with pendulum suspensions based on both tungsten and higher quality factor uncoated fused silica torsion fibers. The results achieved with the fused silica pendulum establish more stringent upper limits on the excess force noise attributable to the sensor--at a level that roughly coincides with the LISA Pathfinder flight goal around 1 mHz. Additionally, these measurements demonstrate a force sensitivity improvement over what can be achieved with thermal noise-limited tungsten over a wide range of frequencies, with significant further improvements still possible. [ABSTRACT FROM AUTHOR]

Published
2009
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50. The first mock data challenge for LISA Pathfinder.

Author

A Monsky, M Hewitson, L Ferraioli, G Wanner, M Nofrarias, M Hueller, I Diepholz, A Grynagier, M Armano, M Benedetti, J Bogenstahl, D Bortoluzzi, P Bosetti, N Brandt, A Cavalleri, G Ciani, I Cristofolini, M Cruise, K Danzmann, and R Dolesi

Subjects
DATA libraries, LASER interferometry, EXPERIMENTS, AEROSPACE engineering, SIMULATION methods & models, SPACE exploration, OUTER space
Abstract

The data analysis of the LISA Technology Package (LTP) will comprise a series of discrete experiments, each focusing on a particular noise measurement or characterization of the instrument in various operating modes. Each of these experiments must be analysed and planned in advance of the mission because the results of a given experiment will have an impact on those that follow. As such, a series of mock data challenges (MDCs) will be developed and carried out with the aim of preparing the analysis tools and optimizing the various planned analyses. The first of these MDCs (MDC1) is a simplified treatment of the dynamics along the axis joining the two test masses onboard LISA Pathfinder. The validation of the dynamical model by predicting the spectra of the interferometer output data is shown, a prediction for the data analysis is calculated and, finally, several simulated interferometer data sets are analysed and calibrated to equivalent out-of-loop test mass acceleration. [ABSTRACT FROM AUTHOR]

Published
2009
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