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1. X-ray detectors for the BabyIAXO solar axion search

Author

K. Altenmüller, B. Biasuzzi, J.F. Castel, S. Cebrián, T. Dafni, K. Desch, D. Díez-Ibañez, E. Ferrer-Ribas, J. Galan, J. Galindo, J.A. García, I.G. Irastorza, J. Kaminski, G. Luzón, C. Margalejo, H. Mirallas, X.F. Navick, L. Obis, A. Ortiz de Solórzano, J. von Oy, T. Papaevangelou, O. Pérez, J. Ruz, T. Schiffer, S. Schmidt, L. Segui, J.K. Vogel, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear and High Energy Physics, Dark matter detectors, detector, background, energy resolution, X-ray detectors, Micropattern gaseous detectors, IAXO, low, dark matter, solar, X-ray, observatory, efficiency, ionization chamber, axion, technology, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation, Micromegas
Abstract

International audience; BabyIAXO is a helioscope under construction to search for an emission of the axion particle from the Sun. At the same time it serves as an intermediate stage towards the International Axion Observatory (IAXO). An integral component of this experiment is a low background X-ray detector with a high efficiency in the 1–10 keV energy range. Micromegas detectors are considered as baseline technology for BabyIAXO thanks to the relatively high efficiency and very low background level. Other detector technologies developed to reach better energy resolution while maintaining high efficiency and low background level are also under study. In this paper, we review the BabyIAXO design and present the analysis of data taken with the prototype of an IAXO Micromegas detector. A background level of 8.8×10−7counts keV−1cm−2s−1 was reached.

Published
2022
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2. Conceptual design of BabyIAXO, the intermediate stage towards the International Axion Observatory

Author

S. Arguedas Cuendis, C. Oriol, J. Castel, D. Voronin, A. Abeln, Olivier Limousin, A. Marin-Franch, Sergey Troitsky, S. Cebrián, D. Gascon, D. D. M. Ferreira, C. J. Hailey, L. Gastaldo, Stefano Basso, R. Iglesias-Marzoa, T. Dafni, K. Altenmüller, L. Segui, Ulrich Werthenbach, D. Hengstler, J. Golm, J. M. Carmona, F.J. Iguaz, Maurizio Giannotti, F. Rueda-Teruel, Leonid Kravchuk, V. S. Pantuev, S. Aune, S. Rueda-Teruel, K. Ludwig, D. Calvet, Joan Mauricio, Igor Tkachev, Klaus Kurt Desch, BayarJon Paul Lubsandorzhiev, E. Ferrer-Ribas, Fabrizio Tavecchio, A. Dudarev, J. P. Mols, Andreas Ringwald, A. A. Nozik, U. Schneekloth, X. F. Navick, Javier Redondo, M. M. Civitani, N. Bykovskiy, E. O. Saemann, Nikita Ushakov, B. Döbrich, O. Pérez, Thomas Papaevangelou, A. Lindner, S. N. Gninenko, B. Kanoute, Eric Armengaud, E. Unzhakov, C. Cogollos, C. Iñiguez, Matthias Mentink, P. Borges de Sousa, Susanne Mertens, Søren Schmidt, Federico Mescia, J. Ruz, Pierre Brun, L. Dumoulin, C. Malbrunot, J. Hahn, V. Chernov, A. Ortiz de Solórzano, K. Perez, Thierry Lasserre, I. Drachnev, S. Karstensen, L. Bergé, Y. Giomataris, L. Obis, E. Picatoste, F. Marutzky, S. Oster, I. Lomskaya, Jordi Salvado, B. Biasuzzi, I. G. Irastorza, Lars Hagge, H. P. Pais Da Silva, Y. Menesguen, J. Kaminski, Walter Wuensch, G. López-Alegre, Alessio Notari, S. Marnieros, Michael J. Pivovaroff, Ivor Fleck, A. V. Derbin, P. Laurent, Finn Erland Christensen, T. Schiffer, N. Golubev, David Attié, P. L. Henriksen, C. Nones, D. Unger, M. Dinter, D.V. Poda, A. Giuliani, C. Margalejo, E. Ruiz-Choliz, Julia Vogel, G. Luzón, Amanda Weltman, T. Houdy, Krešimir Jakovčić, G. Pareschi, D. Díez, A. Yanes-Díaz, Matias Rodrigues, F. Orsini, Matthias Schott, J. Galán, V. N. Muratova, Martin Loidl, Biljana Lakić, H. Mirallas, H. H. J. ten Kate, Jordi Miralda-Escudé, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), IAXO, Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), ANR-19-CE31-0024,DALPS,Déteteurs pour la recherche des particules 'axion-like'(2019), Irastorza, I. G., and IAXO Collaboration

Subjects
Physics - Instrumentation and Detectors, QC770-798, Other experiments, 01 natural sciences, High Energy Physics - Experiment, design [detector], High Energy Physics - Experiment (hep-ex), Observatory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Other experiment, Detectors and Experimental Techniques, physics.ins-det, Physics, solar [axion], Detector, Instrumentation and Detectors (physics.ins-det), CP violation, Beyond Standard Model, Dark matter, axion-like particles, Astrophysics - Instrumentation and Methods for Astrophysics, Particle Physics - Experiment, Nuclear and High Energy Physics, Particle physics, Astrophysics and Astronomy, FOS: Physical sciences, dark matter, Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Sensitivity (control systems), 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Axion, detector: design, Helioscope, axion: dark matter, 010308 nuclear & particles physics, hep-ex, DESY, IAXO, sensitivity, optics, Beyond standard model, axion: solar, dark matter [axion], astro-ph.IM
Abstract

This article describes BabyIAXO, an intermediate experimental stage of the International Axion Observatory (IAXO), proposed to be sited at DESY. IAXO is a large-scale axion helioscope that will look for axions and axion-like particles (ALPs), produced in the Sun, with unprecedented sensitivity. BabyIAXO is conceived to test all IAXO subsystems (magnet, optics and detectors) at a relevant scale for the final system and thus serve as prototype for IAXO, but at the same time as a fully-fledged helioscope with relevant physics reach itself, and with potential for discovery. The BabyIAXO magnet will feature two 10 m long, 70 cm diameter bores, and will host two detection lines (optics and detector) of dimensions similar to the final ones foreseen for IAXO. BabyIAXO will detect or reject solar axions or ALPs with axion-photon couplings down to $g_{a\gamma} \sim 1.5 \times 10^{-11}$ GeV$^{-1}$, and masses up to $m_a\sim 0.25$ eV. BabyIAXO will offer additional opportunities for axion research in view of IAXO, like the development of precision x-ray detectors to identify particular spectral features in the solar axion spectrum, and the implementation of radiofrequency-cavity-based axion dark matter setups., Comment: 77 pages, 49 figures. Prepared for submission to JHEP. Third version after referees comments

Published
2021
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3. Axion search with BabyIAXO in view of IAXO

Author

Pierre Brun, A. Marin-Franch, S. Aune, C. Iñiguez, G. Luzón, D. Díez, Y. Giomataris, L. Obis, Nikolai Golubev, Igor Tkachev, G. Pareschi, S. Rueda-Teruel, B. Biasuzzi, D. Unger, Marta Civitani, O. Limousin, L. Kravchuk, A. Abeln, K. Altenmüller, Walter Wuensch, Ulrich Werthenbach, Sergey Troitsky, N. Bykovskiy, J.P. Mols, Sergei Gninenko, J. Golm, L. Dumoulin, Amanda Weltman, Matthias Mentink, C. Nones, Krešimir Jakovčić, I. Lomskaya, Javier Redondo, J. Vogel, J. Ruz, I. Drachnev, M. J. Pivovaroff, D.V. Poda, Jordi Miralda-Escudé, Javier Galan, Loredana Gastaldo, T. Lasserre, C. Malbrunot, I. G. Irastorza, Lars Hagge, Nikita Ushakov, P. L. Henriksen, Joan Mauricio, D. Calvet, E. Ruiz-Choliz, V. Chernov, A. Ortiz de Solórzano, T. Papaevangelou, K. Perez, BayarJon Paul Lubsandorzhiev, S. Marnieros, R. Iglesias-Marzoa, J. F. Castel, H. P. Pais Da Silva, S. Schmidt, H. Ten Kate, S. Cebrián, Fabrizio Tavecchio, A. A. Nozik, F. J. Iguaz-Gutierrez, Finn Erland Christensen, Y. Menesguen, David Gascon, T. Schiffer, P. Laurent, V. S. Pantuev, M. R.D. Rodrigues, D. Hengstler, David Attié, C. Margalejo, J. M. Carmona, Jordi Salvado, B. Kanoute, F. Marutzky, Stefano Basso, T. Dafni, S. Arguedas Cuendis, Alexey Dudarev, C. Oriol, S. Oster, Luc Bergé, G. López-Alegre, J. Hahn, Biljana Lakić, U. Schneekloth, H. Mirallas, Maurizio Giannotti, E. Ferrer-Ribas, Charles J. Hailey, X-F. Navick, F. Rueda-Teruel, A. V. Derbin, E. O. Saemann, E. Armengaud, E. Picatoste, Federico Mescia, V. Muratova, Martin Loidl, O. Pérez, D. Voronin, P. Borges de Sousa, K. Ludwig, Klaus Kurt Desch, Babette Döbrich, S. Karstensen, D. D. M. Ferreira, L. Segui, Andreas Ringwald, C. Cogollos, A. Yanes-Díaz, Ivor Fleck, F. Orsini, A. Giuliani, Matthias Schott, Jochen Kaminski, Alessio Notari, M. Dinter, E. Unzhakov, A. Lindner, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Heidelberg University, University of Zaragoza - Universidad de Zaragoza [Zaragoza], European Organization for Nuclear Research (CERN), INAF - Osservatorio Astronomico di Brera (OAB), Istituto Nazionale di Astrofisica (INAF), Moscow Institute of Physics and Technology [Moscow] (MIPT), Danmarks Tekniske Universitet = Technical University of Denmark (DTU), Universitat de Barcelona (UB), National Research Center 'Kurchatov Institute' (NRC KI), Rheinische Friedrich-Wilhelms-Universität Bonn, Deutsches Elektronen-Synchrotron [Hamburg] (DESY), National Space Institute [Lyngby] (DTU Space), University of Siegen, Kirchhoff Institute for Physics, University of Heidelberg, Dept Phys Sci - Barry University, Barry University, Institute for Nuclear Research of Russian Academy of Sciences (INR), Russian Academy of Sciences [Moscow] (RAS), Friedrich-Schiller-Universität = Friedrich Schiller University Jena [Jena, Germany], Universität Siegen [Siegen], Kirchhoff Institute for Physics, Universität Heidelberg [Heidelberg] = Heidelberg University, Centro de Estudios de Física del Cosmos de Aragón, Rudjer Boskovic Institute [Zagreb], Laboratoire National Henri Becquerel (LNHB), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département d'instrumentation Numérique (DIN (CEA-LIST)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institució Catalana de Recerca i Estudis Avançats (ICREA), Massachusetts Institute of Technology (MIT), SLAC National Accelerator Laboratory (SLAC), Stanford University, Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), Lawrence Livermore National Laboratory (LLNL), University of Cape Town, IAXO collaboration, Technical University of Denmark [Lyngby] (DTU), Universität Heidelberg [Heidelberg], Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST), and Johannes Gutenberg - Universität Mainz (JGU)

Subjects
Particle physics, Physics - Instrumentation and Detectors, solar axion, [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], experimental methods, Dark matter, FOS: Physical sciences, 7. Clean energy, String (physics), Standard Model, axion helioscope, design [detector], International Axion Observatory (IAXO), Observatory, Peccei-Quinn mechanism, Dark Matter, detector design, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, Axion, sun-tracking systems, physics.ins-det, activity report, detector: design, Physics, instrumentation, Helioscope, Large Hadron Collider, detector, solar [axion], DESY, Instrumentation and Detectors (physics.ins-det), [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], IAXO, magnet, optics, axion: solar
Abstract

Axions are a natural consequence of the Peccei-Quinn mechanism, the most compelling solution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model, notably in string theories. Both axions and ALPs are very well motivated candidates for Dark Matter, and in addition, they would be copiously produced at the sun's core. A relevant effort during the last decade has been the CAST experiment at CERN, the most sensitive axion helioscope to-date. The International Axion Observatory (IAXO) is a large-scale 4th generation helioscope. As its primary physics goal, IAXO will look for solar axions or ALPs with a signal to background ratio of about 5 orders of magnitude higher than CAST. Recently the IAXO collaboration has proposed and intermediate experimental stage, BabyIAXO, conceived to test all IAXO subsystems (magnet, optics, detectors and sun-tracking systems) at a relevant scale for the final system and thus serve as pathfinder for IAXO but at the same time as a fully-fledged helioscope with record and relevant physics reach in itself with potential for discovery. BabyIAXO was endorsed by the Physics Review committee of DESY last May 2019. Here we will review the status and prospects of BabyIAXO and its potential to probe the most physics motivated regions of the axion & ALPs parameter space., 6 pages, ICHEP 2020 Virtual conference

Published
2020
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4. First Results on the Search for Chameleons with the KWISP Detector at CAST

Author

C. Krieger, Sami K. Solanki, K. Barth, B. Döbrich, S. Neff, Michael J. Pivovaroff, J. Castel, A. Belov, I. Tsagris, E. Ruiz Chóliz, Marc Schumann, A. Ozbey, A. V. Dermenev, A. Bayirli, L. Stewart, S. C. Yildiz, J. Ruz, J. G. Garza, L. Miceli, Serkant Ali Cetin, S. Arguedas Cuendis, T. Dafni, Giovanni Cantatore, J. M. Laurent, F.J. Iguaz, T. Vafeiadis, J. M. Carmona, Klaus Kurt Desch, I. G. Irastorza, M. Maroudas, M. D. Hasinoff, S. N. Gninenko, Biljana Lakić, I. Ortega, H. Bräuninger, M. Vretenar, Konstantin Zioutas, Søren Schmidt, Marin Karuza, Sebastian Baum, Julia Vogel, G. Luzón, A. Gardikiotis, Yannis K. Semertzidis, J. Baier, M. Davenport, Krešimir Jakovčić, M. Rosu, H. Fischer, Wolfgang Funk, J. A. García, Dieter Hoffmann, J. Kaminski, Arguedas Cuendis, S., Baier, J., Barth, K., Baum, S., Bayirli, A., Belov, A., Brauninger, H., Cantatore, G., Carmona, J. M., Castel, J. F., Cetin, S. A., Dafni, T., Davenport, M., Dermenev, A., Desch, K., Dobrich, B., Fischer, H., Funk, W., Garcia, J. A., Gardikiotis, A., Garza, J. G., Gninenko, S., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jakovcic, K., Kaminski, J., Karuza, M., Krieger, C., Lakic, B., Laurent, J. M., Luzon, G., Maroudas, M., Miceli, L., Neff, S., Ortega, I., Ozbey, A., Pivovaroff, M. J., Rosu, M., Ruz, J., Choliz, E. R., Schmidt, S., Schumann, M., Semertzidis, Y. K., Solanki, S. K., Stewart, L., Tsagris, I., Vafeiadis, T., Vogel, J. K., Vretenar, M., Yildiz, S. C., Zioutas, K., and İÜC

Subjects
Astrophysics and Astronomy, Physics - Instrumentation and Detectors, Photon, Cosmology and Nongalactic Astrophysics (astro-ph.CO), astro-ph.SR, Physics::Instrumentation and Detectors, Chameleons, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, law.invention, Telescope, High Energy Physics - Experiment (hep-ex), Optics, law, Opto-mechanical sensor, 0103 physical sciences, Chameleon, Dark energy, Detectors and Experimental Techniques, 010306 general physics, chameleons, dark energy, opto-mechanical sensor, interferometry, Axion, physics.ins-det, Solar and Stellar Astrophysics (astro-ph.SR), Physics, Coupling, 010308 nuclear & particles physics, business.industry, hep-ex, Detector, Michelson interferometer, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Interferometry, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, astro-ph.CO, Direct coupling, business, Particle Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We report on a first measurement with a sensitive opto-mechanical force sensor designed for the direct detection of coupling of real chameleons to matter. These dark energy candidates could be produced in the Sun and stream unimpeded to Earth. The KWISP detector installed on the CAST axion search experiment at CERN looks for tiny displacements of a thin membrane caused by the mechanical effect of solar chameleons. The displacements are detected by a Michelson interferometer with a homodyne readout scheme. The sensor benefits from the focusing action of the ABRIXAS X-ray telescope installed at CAST, which increases the chameleon flux on the membrane. A mechanical chopper placed between the telescope output and the detector modulates the incoming chameleon stream. We present the results of the solar chameleon measurements taken at CAST in July 2017, setting an upper bound on the force acting on the membrane of $80$~pN at 95\% confidence level. The detector is sensitive for direct coupling to matter $10^4 \leq\beta_m \leq 10^8$, where the coupling to photons is locally bound to $\beta_\gamma \leq 10^{11}$., Comment: 21 pages, 12 figures

Published
2019

5. An update on the Axion Helioscopes front: current activities at CAST and the IAXO project

Author

Joachim Jacoby, J. I. Collar, H. Ten Kate, Fritz Caspers, Julia Vogel, J. Kaminski, H. Silva, Giovanni Cantatore, Benito Gimeno, S. C. Yildiz, M. Betz, Alexey Dudarev, Georg G. Raffelt, A. Belov, F.J. Iguaz, Rainer Kotthaus, Javier Redondo, F. Haug, K. Barth, G. Luzón, Klaus Kurt Desch, C. Eleftheriadis, S. Caspi, P. Brax, Georgios Fanourakis, W. C. Wester, Hector Gomez, J. M. Laurent, N. Breijnholt, I. Dratchnev, Toyokazu Sekiguchi, S. Neff, L. Stewart, Joerg Jaeckel, Amanda Weltman, Marin Karuza, C. Krieger, Pierre Sikivie, A. Tomás, S. Aune, C. Nones, Heinrich Bräuninger, Serkant Ali Cetin, M. Rosu, I. G. Irastorza, J. M. Carmona, Babette Döbrich, Krešimir Jakovčić, Steffen Hauf, Takashi Hiramatsu, Biljana Lakić, Milica Krčmar, Evangelos Gazis, M. Davenport, Dieter H. H. Hoffmann, T. Papaevangelou, J.A. Villar, A. V. Derbin, Ante Ljubičić, Dieter Horns, S. N. Gninenko, A. Diago, I. Ortega, S. Matsuki, E. Gruber, Sergey Troitsky, T. Dafni, J. G. Garza, I. Savvidis, Andreas Ringwald, A. Lindner, Jordi Isern, M. Arik, Javier Galan, Ken'ichi Saikawa, E. Georgiopoulou, T. Guthörl, Eduardo Guendelman, Adriane De Assis Lawisch Rodriguez, I. Shilon, D. Chelouche, S. Russenschuck, Kenichi Imai, V. N. Muratova, P. Vedrine, F.E. Christensen, T. O. Niinikoski, E. Ferrer-Ribas, F. T. Avignone, Charles J. Hailey, M. D. Hasinoff, Peter Friedrich, M. J. Pivovaroff, Konstantin Zioutas, Sami K. Solanki, Louis Walckiers, H. Riege, Pierre Brun, Konstantinos Kousouris, Markus Kuster, A. Dael, T. Geralis, Gianpaolo Carosi, J. A. Garcia, A. Gardikiotis, Yannis K. Semertzidis, Eric Armengaud, Raimo Hartmann, Theodoros Vafeiadis, J. Ruz, K. Königsmann, Masahiro Kawasaki, D. González-Díaz, I. Giomataris, K. van Bibber, Olivier Limousin, A.C. Jakobsen, A. Liolios, Dafni, T, Arik, M., Armengaud, E., Aune, S., Avignone, F. T., Barth, K., Belov, A., Betz, M., Bräuninger, H., Brax, P., Breijnholt, N., Brun, P., Cantatore, Giovanni, Carmona, J. M., Carosi, G. P., Caspers, F., Caspi, S., Cetin, S. A., Chelouche, D., Christensen, F. E., Collar, J. I., Dael, A., Davenport, M., Derbin, A. V., Desch, K., Diago, A., Döbrich, B., Dratchnev, I., Dudarev, A., Eleftheriadis, C., Fanourakis, G., Ferrer Ribas, E., Friedrich, P., Galán, J., García, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Georgiopoulou, E., Geralis, T., Gimeno, B., Giomataris, I., Gninenko, S., Gómez, H., González Díaz, D., Gruber, E., Guendelman, E., Guthörl, T., Hailey, C. J., Hartmann, R., Hauf, S., Haug, F., Hasinoff, M. D., Hiramatsu, T., Hoffmann, D. H. H., Horns, D., Iguaz, F. J., Irastorza, I. G., Isern, J., Imai, K., Jacoby, J., Jaeckel, J., Jakobsen, A. C., Jakovcić, K., Kaminski, J., Kawasaki, M., Karuza, M., Königsmann, K., Kotthaus, R., Krcmar, M., Kousouris, K., Krieger, C., Kuster, M., Lakić, B., Laurent, J. M., Limousin, O., Lindner, A., Liolios, A., Ljubicić, A., Luzón, G., Matsuki, S., Muratova, V. N., Neff, S., Niinikoski, T., Nones, C., Ortega, I., Papaevangelou, T., Pivovaroff, M. J., Raffelt, G., Redondo, J., Riege, H., Ringwald, A., Rodríguez, A., Rosu, M., Russenschuck, S., Ruz, J., Saikawa, K., Savvidis, I., Sekiguchi, T., Semertzidis, Y. K., Shilon, I., Sikivie, P., Silva, H., Solanki, S. K., Stewart, L., ten Kate, H. H. J., Tomas, A., Troitsky, S., Vafeiadis, T., van Bibber, K., Vedrine, P., Villar, J. A., Vogel, J. K., Walckiers, L., Weltman, A., Wester, W., Yildiz, S. C., Zioutas, K., Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR3959, Çetin, Serkant Ali, Arık, Metin, and Yıldız, Süleyman Cenk

Subjects
X-Ray Focusing Devices, X-ray detector, Particle physics, Nuclear and High Energy Physics, X-ray focusing device, Axions, Dark matter, Magnet Development, Micromegas detector, axions, dark matter, x-ray, detectors, micromegas detectors, x-ray focusing devices, magnet development, CAST, IAXO, 01 natural sciences, Axion, Primary (astronomy), Observatory, 0103 physical sciences, Dark Matter, X-Ray Detectors, 010306 general physics, Physics, Helioscope, Micromegas Detectors, 010308 nuclear & particles physics, Magnet development, Micromegas detectors, X-ray detectors, X-ray focusing devices, Orders of magnitude (time), Experimental methods, CERN Axion Solar Telescope
Abstract

Çetin, Serkant Ali (Dogus Author) -- Arık, Metin (Dogus Author) -- Yıldız, Süleyman Cenk (Dogus Author) Although they have not yet been detected, axions and axion-like particles (ALPs) continue to maintain the interest (even increasingly so) of the rare-event searches community as viable candidates for the Dark Matter of the Universe but also as a solution for several other puzzles of astrophysics. Their property of coupling to photons has inspired different experimental methods for their detection, one of which is the helioscope technique. The CERN Axion Solar Telescope (CAST) is the most sensitive helioscope built up to date and has recently published part of the latest data taken with the magnet bores gradually filled with He-3, probing the mass range up to 1.17 eV. The International AXion Observatory (IAXO) is being proposed as a facility where different axion studies can be performed, with the primary goal to study axions coming from the Sun. Designed to maximize sensitivity, it will improve the levels reached by CAST by almost 5 orders of magnitude in signal detection, that is more than one order of magnitude in terms of gay. Here we will summarize the most important aspects of the helioscopes, and focus mainly on IAXO, based on the recent papers [1, 2].

Published
2016
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6. Next Generation Search for Axion and ALP Dark Matter with the International Axion Observatory

Author

S. Basso, I. Lomskaya, I. G. Irastorza, Javier Redondo, Olivier Limousin, A. Nunez, Ioannis Giomataris, Lluis Garrido, Jochen Kaminski, Milica Krčmar, Alessio Notari, Amanda Weltman, A. A. Nozik, A. Lindner, P. Vedrine, D. Costa, L. Gastaldo, David Gascon, I. Tkackev, J. F. Castel, Ricardo Graciani, V. S. Pantuev, Matthias Schott, Andreas Ringwald, Krešimir Jakovčić, J. M. Carmona, Pierre Brun, Cristiano Germani, Thierry Lasserre, E. Ferrer-Ribas, Jordi Salvado, M. J. Pivovaroff, S. Cebrián, K. Perez, U. Schneekloth, C. Nones, F. Mescia, G. Tagliaferri, E. V. Unzhakov, V. N. Muratova, E. Armengaud, T. Schiffer, Sergey Troitsky, F. Tavecchio, Biljana Lakić, G. Pareschi, N. Golubev, David Attié, Julia Vogel, J. Galan, N. Bykovskiy, X.F. Navick, C. Cogollos, G. Luzón, C. Krieger, H. Mirallas, J. Ruz, S. Schmidt, E. Ruiz-Choliz, H. Ten Kate, P. Laurent, G. Galanti, T. Dafni, Klaus Kurt Desch, Jordi Miralda-Escudé, H. Silva, A. V. Derbin, Marie-Anne Descalle, S. N. Gninenko, I. Dratchnev, A. Ortiz de Solórzano, B. Dobrich, T. Papaevangelou, G. Ghisellini, Maurizio Giannotti, E. Picatoste, M. M. Civitani, Alexey Dudarev, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Particle physics, CERN Lab, Physics::Instrumentation and Detectors, Dark matter, Observatories, axion: detector, 7. Clean energy, 01 natural sciences, Cosmology, High Energy Physics::Theory, Primakoff effect, Sensitivity, WIMP, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Axion, activity report, Physics, Helioscope, Large Hadron Collider, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Toroidal magnetic fields, Detectors, observatory, 13. Climate action, Couplings, axion-like particles, proposed experiment, CERN Axion Solar Telescope, axion: solar, Telescopes
Abstract

International audience; More than 80 years after the postulation of dark matter, its nature remains one of the fundamental questions in cosmology. Axions are currently one of the leading candidates for the hypothetical, non-baryonic dark matter that is expected to account for about 25% of the energy density of the Universe. Especially in the light of the Large Hadron Collider at CERN slowly closing in on Weakly-Interacting Massive Particle (WIMP) searches, axions and axion-like particles (ALPs) provide a viable alternative approach to solving the dark matter problem. The fact that makes them particularly appealing is that they were initially introduced to solve a long-standing problem in quantum chromodynamics and the Standard Model of particle physics.Helioscopes are a type of axion experiment searching for axions produced in the core of the Sun via the Primakoff effect. The International Axion Observatory (IAXO) is a next generation axion helioscope aiming at a sensitivity to the axion-photon coupling of 1 − 1.5 orders of magnitude beyond the current most sensitive axion helioscope, which is the CERN Axion Solar Telescope (CAST). IAXO will be able to challenge the stringent bounds from supernova SN1987A and test the axion interpretation of anomalous white-dwarf cooling. Beyond standard axions, this new experiment will also be able to search for a large variety of axion-like particles and other novel excitations at the low-energy frontier of elementary particle physics. BabyIAXO is proposed as an intermediate-scale experiment increasing the sensitivity to axion-photon couplings down to a few 10$^{−11}$ GeV$^{−1}$ and thus delivering significant physics results while demonstrating the feasibility of the full-scale IAXO experiment. Here we introduce the IAXO and BabyIAXO experiments, report on the current status of both and outline the expected IAXO science reach.

Published
2018
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7. The Next Generation of Axion Helioscopes: The International Axion Observatory (IAXO)

Author

Javier Redondo, Biljana Lakić, Eduardo Guendelman, K. van Bibber, A. Diago, S. Matsuki, Hector Gomez, Marin Karuza, C. Eleftheriadis, Olivier Limousin, H. H. J. ten Kate, Eric Armengaud, T. Dafni, Finn Erland Christensen, I. Ortega, Pierre Sikivie, Anders Clemen Jakobsen, F.J. Iguaz, Charles J. Hailey, Diego González-Díaz, Theodoros Vafeiadis, Milica Krčmar, Takashi Hiramatsu, V. N. Muratova, Dieter H. H. Hoffmann, J.A. Villar, S. C. Yildiz, Klaus Kurt Desch, I. Shilon, B. Döbrich, Javier Galan, J. G. Garza, Pierre Brun, A. Dael, S. Gninenko, F. T. Avignone, A. Tomás, W. C. Wester, C. Krieger, I. G. Irastorza, Masahiro Kawasaki, A. Lindner, A. Dudarev, Andreas Ringwald, Michael J. Pivovaroff, M. Betz, A. V. Derbin, P. Brax, C. Nones, D. Chelouche, Ioannis Giomataris, I. Savvidis, Yannis K. Semertzidis, S. Russenschuck, Kenichi Imai, Konstantin Zioutas, Theodoros Geralis, Serkant Ali Cetin, Giovanni Cantatore, Julia Vogel, Jordi Isern, H. Silva, E. Ferrer-Ribas, Ken'ichi Saikawa, G. Luzón, Dieter Horns, P. Vedrine, G. Fanourakis, Toyokazu Sekiguchi, Fritz Caspers, J. A. Garcia, Joerg Jaeckel, Amanda Weltman, J. Ruz, M. Davenport, J. Kaminski, L. Walckiers, Krešimir Jakovčić, Gianpaolo Carosi, A. Liolios, B. Gimeno, Georg G. Raffelt, T. Papaevangelou, J. M. Carmona, S. Caspi, Konstantinos Kousouris, I. Dratchnev, Sergey Troitsky, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR3959, Çetin, Serkant Ali, Vogel, J. K., Armengaud, E., Avignone, F. T., Betz, M., Brax, P., Brun, P., Cantatore, Giovanni, Carmona, J. M., Carosi, G. P., Caspers, F., Caspi, S., Cetin, S. A., Chelouche, D., Christensen, F. E., Dael, A., Dafni, T., Davenport, M., Derbin, A. V., Desch, K., Diago, A., Döbrich, B., Dratchnev, I., Dudarev, A., Eleftheriadis, C., Fanourakis, G., Ferrer Ribas, E., Galán, J., García, J. A., Garza, J. G., Geralis, T., Gimeno, B., Giomataris, I., Gninenko, S., Gómez, H., González Díaz, D., Guendelman, E., Hailey, C. J., Hiramatsu, T., Hoffmann, D. H. H., Horns, D., Iguaz, F. J., Irastorza, I. G., Isern, J., Imai, K., Jakobsen, A. C., Jaeckel, J., Jakovčić, K., Kaminski, J., Kawasaki, M., Karuza, M., Krčmar, M., Kousouris, K., Krieger, C., Lakić, B., Limousin, O., Lindner, A., Liolios, A., Luzón, G., Matsuki, S., Muratova, V. N., Nones, C., Ortega, I., Papaevangelou, T., Pivovaroff, M. J., Raffelt, G., Redondo, J., Ringwald, A., Russenschuck, S., Ruz, J., Saikawa, K., Savvidis, I., Sekiguchi, T., Semertzidis, Y. K., Shilon, I., Sikivie, P., Silva, H., ten Kate, H., Tomas, A., Troitsky, S., Vafeiadis, T., van Bibber, K., Vedrine, P., Villar, J. A., Walckiers, L., Weltman, A., Wester, W., Yildiz, S. C., and Zioutas, K.

Subjects
QCD axion, Particle physics, Physics::Instrumentation and Detectors, Dark matter, Physics and Astronomy(all), 01 natural sciences, 7. Clean energy, magnetic helioscope, High Energy Physics::Theory, QCD axions, Astroparticle Physics, Axion, Observatory, 0103 physical sciences, dark matter, Dark Matter, ddc:530, Detectors and Experimental Techniques, 010306 general physics, Astroparticle physics, Physics, Helioscope, 010308 nuclear & particles physics, Axion Dark Matter Experiment, High Energy Physics::Phenomenology, Strong CP problem, IAXO, Strong CP Problem, ALP, CERN Axion Solar Telescope, Particle Physics - Experiment, Helioscopes
Abstract

Çetin, Serkant Ali (Dogus Author) -- Conference full title: 13th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2013; Asilomar Conference Grounds Monterey Peninsula; United States; 8 September 2013 through 13 September 2013. The International Axion Observatory (IAXO) is a proposed 4th-generation axion helioscope with the primary physics research goal to search for solar axions via their Primakoff conversion into photons of 1 - 10 keV energies in a strong magnetic field. IAXO will achieve a sensitivity to the axion-photon coupling gaγ down to a few ×10-12 GeV-1 for a wide range of axion masses up to ∼ 0.25 eV. This is an improvement over the currently best (3rd generation) axion helioscope, the CERN Axion Solar Telescope (CAST), of about 5 orders of magnitude in signal strength, corresponding to a factor ∼ 20 in the axion photon coupling. IAXO's sensitivity relies on the construction of a large superconducting 8-coil toroidal magnet of 20 m length optimized for axion research. Each of the eight 60 cm diameter magnet bores is equipped with x-ray optics focusing the signal photons into ∼ 0.2 cm2 spots that are imaged by very low background x-ray detectors. The magnet will be built into a structure with elevation and azimuth drives that will allow solar tracking for 12 hours each day. This contribution is a summary of our papers [1-3] and we refer to these for further details.

Published
2015
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8. Recent Constraints on Axion-photon and Axion-electron Coupling with the CAST Experiment

Author

Julia Vogel, J. Ruz, and M.J. Pivovaroff

Subjects
Physics, Helioscope, helioscopes, Photon, axions, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, sun, Astronomy, Electron, Sunset, magnetic fields, Physics and Astronomy(all), Solar core, Physics::Space Physics, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Detectors and Experimental Techniques, CERN Axion Solar Telescope, Axion, Primakoff effect, Particle Physics - Experiment, white dwarfs
Abstract

The CERN Axion Solar Telescope (CAST) is a helioscope looking for axions arising from the solar core plasma and arriving to Earth. The experiment, located in Geneva (Switzerland) is able to follow the Sun during sunrise and sunset. Four x-ray detectors mounted on both ends of the magnet wait for photons from axion-to-photon conversion due to the Primakoff effect. Up to date, with the completion of Phases I and II, CAST has been looking for axions that could be produced in the Sun by both, hadronic and non-hadronic mechanisms.

Published
2015
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9. New micromegas for axion searches in CAST

Author

Hector Gomez, S. Aune, I. G. Irastorza, G. Luzón, T. Geralis, T. Vafeiadis, J. Ruz, I. Giomataris, Georgios Fanourakis, A. Gardikiotis, A. Tomás, J. Morales, A Rodríguez, Javier Galan, S. C. Yildiz, T. Papaevangelou, T. Dafni, F.J. Iguaz, E. Ferrer-Ribas, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, and Yıldız, Süleyman Cenk

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Axions, Detector, X-ray detector, MicroMegas detector, Gas Micropattern Detectors, Low Background, 01 natural sciences, 0103 physical sciences, Cast, X-ray Detectors, 010306 general physics, Instrumentation, Axion, Micromegas
Abstract

Yıldız, Süleyman Cenk (Dogus Author) Micromegas detectors have been taking data in the CAST experiment since 2002, occupying one opening (out of the two looking for sunrise axions) of the magnet and showing good performance and stability. Currently, three of the four X-ray detectors used in the experiment are micromegas. The new detectors are of the Microbulk technology, which have attracted a lot of attention because of the advantages they present, among them the low-material construction, high radiopurity and good energy resolution. Here, their performance during the last year will be commented. In particular, the low background levels reached in some detectors have triggered a set of studies in order to understand the effect.

Published
2011
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10. A new Micromegas line for the CAST experiment

Author

S. Aune, G. Fanourakis, Theodoros Geralis, Regina Soufli, Berkol Dogan, K. Kousouris, Ioannis Giomataris, A. Giganon, J. Ruz, S. Andriamonje, Javier Galan, Jean Philippe Mols, Heinrich Bräuninger, I. G. Irastorza, M. Riallot, Katherina Zachariadou, Julio Morales, M. J. Pivovaroff, T. Dafni, Esther Ferrer Ribas, Thomas Papaevangelou, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, and Belirlenecek

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Dark matter, Detector, X-ray detector, MicroMegas detector, X - Ray Detector, Nuclear physics, CAST Experiment, Axion, Electromagnetic shielding, Dark Matter, High Energy Physics::Experiment, CERN Axion Solar Telescope, Instrumentation, Micromegas
Abstract

A low background Micromegas detector has been operating on the Cern Axion Solar Telescope (CAST) experiment at CERN for the search of solar axions during the first phase of the experiment. The detector operated efficiently and achieved a very low level of background rejection ( 5 × 10 - 5 counts keV - 1 cm - 2 s - 1 ) thanks to its good spatial and energy resolution as well as the low radioactivity materials used in the construction of the detector. For the second phase of the experiment, the detector is being upgraded by adding a shielding and including focusing optics. These improvements should allow for a background rejection better than two orders of magnitude. The preliminary results of the first tests in the laboratory and in the PANTER X-ray test facility will be shown.

Published
2007
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11. A Micromegas-based low-background x-ray detector coupled to a slumped-glass telescope for axion research

Author

Charles J. Hailey, F. E. Christensen, Ioannis Giomataris, J. Ruz, H. Mirallas, Todd A. Decker, I. G. Irastorza, Theodoros Vafeiadis, F.J. Iguaz, Anders Clemen Jakobsen, Julia Vogel, F. Aznar, G. Luzón, J. A. Garcia, R. M. Hill, E. Ferrer-Ribas, J. G. Gracia, T. Dafni, M. J. Pivovaroff, T. Papaevangelou, and J. F. Castel

Subjects
Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, X-ray detector, FOS: Physical sciences, High Energy Physics - Experiment, law.invention, Telescope, High Energy Physics - Experiment (hep-ex), Optics, Observatory, law, Detectors and Experimental Techniques, physics.ins-det, Instrumentation and Methods for Astrophysics (astro-ph.IM), Axion, Physics, hep-ex, business.industry, Detector, Astronomy and Astrophysics, MicroMegas detector, Instrumentation and Detectors (physics.ins-det), Magnet, Astrophysics - Instrumentation and Methods for Astrophysics, CERN Axion Solar Telescope, business, astro-ph.IM
Abstract

We report on the design, construction and operation of a low background x-ray detection line composed of a shielded Micromegas (micromesh gaseous structure) detector of the microbulk technique. The detector is made from radiopure materials and is placed at the focal point of a $\sim$~5 cm diameter, 1.3 m focal-length, cone-approximation Wolter I x-ray telescope (XRT) comprised of thermally-formed (or "slumped") glass substrates deposited with multilayer coatings. The system has been conceived as a technological pathfinder for the future International Axion Observatory (IAXO), as it combines two of the techniques (optic and detector) proposed in the conceptual design of the project. It is innovative for two reasons: it is the first time an x-ray optic has been designed and fabricated specifically for axion research, and the first time a Micromegas detector has been operated with an x-ray optic. The line has been installed at one end of the CERN Axion Solar Telescope (CAST) magnet and is currently looking for solar axions. The combination of the XRT and Micromegas detector provides the best signal-to-noise ratio obtained so far by any detection system of the CAST experiment with a background rate of 5.4$\times$10$^{-3}\;$counts per hour in the energy region-of-interest and signal spot area., Comment: 21 pages, 16 figures

Published
2015
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12. New solar axion search using the CERN Axion Solar Telescope withHe4filling

Author

T. Papaevangelou, S. C. Yildiz, I. Savvidis, M. D. Hasinoff, Biljana Lakić, J. M. Carmona, I. Giomataris, A. Belov, Evangelos Gazis, T. O. Niinikoski, V. Burwitz, José Villar, L. Stewart, S. Neff, E. Da Riva, Theodoros Vafeiadis, J. Bremer, F.J. Iguaz, Ante Ljubičić, Dieter Hoffmann, Sami K. Solanki, M. Rosu, Markus Kuster, Sergei Gninenko, A. Tomás, T. Geralis, Krešimir Jakovčić, J. G. Garza, Joachim Jacoby, M. Gomez Marzoa, T. Dafni, Georgios Fanourakis, C. Eleftheriadis, M. Kavuk, M. J. Pivovaroff, Konstantin Zioutas, Julia Vogel, Heinrich Bräuninger, J. M. Laurent, Giovanni Cantatore, S. Aune, A. Liolios, Serkant Ali Cetin, K. Barth, G. Luzón, Milica Krčmar, M. Davenport, Marin Karuza, J. A. Garcia, I. Ortega, N. Elias, I. Shilon, Metin Arik, A. V. Dermenev, E. Georgiopoulou, Javier Galan, Georg G. Raffelt, I. G. Irastorza, J. Ruz, J. I. Collar, Adriane De Assis Lawisch Rodriguez, E. Ferrer-Ribas, A. Gardikiotis, and A. Nordt

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Photon, Dark matter, chemistry.chemical_element, Superconducting magnet, 7. Clean energy, chemistry, CERN Axion Solar Telescope, Axion, Helium, Line (formation)
Abstract

The CERN Axion Solar Telescope (CAST) searches for a -> gamma conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward the Sun. Two parallel magnet bores can be filled with helium of adjustable pressure to match the x-ray refractive mass m(gamma) to the axion search mass m(a). After the vacuum phase (2003-2004), which is optimal for m(a) less than or similar to 0.02 eV, we used He-4 in 2005-2007 to cover the mass range of 0.02-0.39 eV and He-3 in 2009-2011 to scan from 0.39 to 1.17 eV. After improving the detectors and shielding, we returned to He-4 in 2012 to investigate a narrow m(a) range around 0.2 eV ("candidate setting" of our earlier search) and 0.39-0.42 eV, the upper axion mass range reachable with He-4, to "cross the axion line" for the KSVZ model. We have improved the limit on the axion-photon coupling to g(a gamma) < 1.47 x 10(-10) GeV-1 (95% C.L.), depending on the pressure settings. Since 2013, we have returned to the vacuum and aim for a significant increase in sensitivity.

Published
2015
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13. Future axion searches with the International Axion Observatory (IAXO)

Author

C. Krieger, A. Lindner, Javier Redondo, Biljana Lakić, L. Walckiers, Pierre Sikivie, Joerg Jaeckel, A. Tomás, Ioannis Giomataris, Iratxe Ortega, K Saikawa, Hector Gomez, Jochen Kaminski, Takashi Hiramatsu, F.J. Iguaz, H. H. J. ten Kate, Milica Krčmar, Anders Clemen Jakobsen, Dieter H. H. Hoffmann, F. T. Avignone, Theodoros Vafeiadis, Krešimir Jakovčić, H. Silva, J.A. Villar, Javier Galan, B. Döbrich, I. Shilon, C. J. Hailey, Jordi Isern, J. G. Garza, A. Diago, Michael J. Pivovaroff, Konstantin Zioutas, S. C. Yildiz, W. C. Wester, Theodoros Geralis, S. Caspi, A. Dael, S. Gninenko, Julia Vogel, K. van Bibber, Toyokazu Sekiguchi, G. Luzón, M. Davenport, Georg G. Raffelt, Finn Erland Christensen, Sergey Troitsky, J. Ruz, Masahiro Kawasaki, Giovanni Cantatore, A. V. Derbin, A. Liolios, C. Eleftheriadis, Dieter Horns, B. Gimeno, T. Papaevangelou, J. M. Carmona, A. Dudarev, Eduardo Guendelman, Andreas Ringwald, Serkant Ali Cetin, I. G. Irastorza, P. Vedrine, G. Fanourakis, I. Savvidis, T. Dafni, S. Russenschuck, E. Ferrer-Ribas, Klaus Kurt Desch, J. A. Garcia, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR3959, Çetin, Serkant Ali, I. G., Irastorza, F. T., Avignone, Cantatore, Giovanni, J. M., Carmona, S., Caspi, S. A., Cetin, F. E., Christensen, A., Dael, T., Dafni, M., Davenport, A. V., Derbin, K., Desch, A., Diago, B., Döbrich, A., Dudarev, C., Eleftheriadi, G., Fanouraki, E., Ferrer Riba, J., Galán, J. A., García, J. G., Garza, T., Gerali, B., Gimeno, I., Giomatari, S., Gninenko, H., Gómez, E., Guendelman, C. J., Hailey, T., Hiramatsu, D. H. H., Hoffmann, D., Horn, F. J., Iguaz, J., Isern, A. C., Jakobsen, J., Jaeckel, K., Jakovčić, J., Kaminski, M., Kawasaki, M., Krčmar, C., Krieger, B., Lakić, A., Lindner, A., Liolio, G., Luzón, I., Ortega, T., Papaevangelou, M. J., Pivovaroff, G., Raffelt, J., Redondo, A., Ringwald, S., Russenschuck, J., Ruz, K., Saikawa, I., Savvidi, T., Sekiguchi, I., Shilon, P., Sikivie, H., Silva, H., ten Kate, A., Toma, S., Troitsky, T., Vafeiadi, K., van Bibber, P., Vedrine, J. A., Villar, J. K., Vogel, L., Walckier, W., Wester, S. C., Yildiz, and K., Zioutas

Subjects
Physics, History, Particle physics, solar axion, Orders of Magnitude, 010308 nuclear & particles physics, Rare event detection, Single photon detectors, Low Background Detectors, 01 natural sciences, dark matter, White Dwarfs, Computer Science Applications, Education, Low energy, Observatory, 0103 physical sciences, solar axions, ddc:530, X-ray Focusing Optics, 010306 general physics, Axion
Abstract

Çetin, Serkant Ali (Dogus Author) -- Conference full title: 6th Symposium on Large TPCs for Low Energy Rare Event Detection; Paris; France; 17 December 2012 through 19 December 2012. The International Axion Observatory (IAXO) is a new generation axion helioscope aiming at a sensitivity to the axion-photon coupling of gaγ ∼ few × 10-12 GeV-1, i.e. 1-1.5 orders of magnitude beyond the one achieved by CAST, currently the most sensitive axion helioscope. The main elements of IAXO are an increased magnetic field volume together with extensive use of x-ray focusing optics and low background detectors, innovations already successfully tested in CAST. Additional physics cases of IAXO could include the detection of electron-coupled axions invoked to explain the white dwarf cooling, relic axions, and a large variety of more generic axion-like particles (ALPs) and other novel excitations at the low-energy frontier of elementary particle physics.

Published
2013
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14. The cern axion solar telescope (CAST): an update

Author

J. M. Carmona, Thomas Papaevangelou, S. Aune, A. Liolios, M.L. Sarsa, A. Ortiz de Solórzano, Y. Semertzidis, J. Engelhauser, José Villar, R. Kotthaus, F. T. Avignone, B. Beltrán, Milica Krčmar, J. P. Robert, Dieter H. H. Hoffmann, R. J. Creswick, J. Morales, Louis Walckiers, M. Delattre, A. Placci, W. Serber, A. Nikolaidis, Markus Kuster, K. Barth, G. Luzón, V. Arsov, D. Kang, A. Delbart, J. Franz, R. Hartmann, Ante Ljubičić, Efrain J. Ferrer, Georg G. Raffelt, Joachim Jacoby, Perikles Rammos, H. Bräuninger, F. H. Heinsius, J. N. Joux, Georgios Fanourakis, T. Geralis, A. Lippitsch, T. Aune, I. Giomataris, H. Fischer, C. Eleftheriadis, J. I. Collar, N. Golubev, E. Chesi, C. Lasseur, B. Vullierme, R. Deoliveira, M. Mutterer, M. D. Hasinoff, T. Dafni, S. Cebrián, H. A. Farach, Joaquin Vieira, A. Belov, G. Cipolla, I. G. Irastorza, M. Davenport, Gerhard Lutz, S. N. Gninenko, S. Dedousis, C. Schill, J. Ruz, Peter Friedrich, F. Formenti, Konstantin Zioutas, S. Andriamonje, K. Königsmann, A. Morales, Biljana Lakić, and L. DiLella

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Magnet, Sunrise, Astrophysics, Sunset, CERN Axion Solar Telescope, Axion, Upper and lower bounds, Atomic and Molecular Physics, and Optics
Abstract

The CERN Axion Solar Telescope (CAST), a 10 meter long LHC, 9 Tesla, test magnet is mounted on a moving platform that tracks the sun about 1.5 hours during sunrise, again during sunset. It moves ±8 0 vertically and ±40 0 horizontally. It has been taking data continuously since July 10, 2003. Data analyzed thus far yield an upper bound on the photon-axion coupling constant, g aγγ ⩽ 3 × 10 −10 GeV −1 for axion masses less than 5 × 10 −2 eV.

Published
2005
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15. Status and perspectives of the CAST experiment

Author

Biljana Lakić, José Villar, C. Ezer, J. I. Collar, T. Dafni, S. Borghi, Giovanni Cantatore, T. Geralis, F.J. Iguaz, S. C. Yildiz, Theodoros Vafeiadis, M. Davenport, S. N. Gninenko, J. Ruz, Sami K. Solanki, Evangelos Gazis, M. Rosu, Georgios Fanourakis, Hector Gomez, Joachim Jacoby, Georg G. Raffelt, G. Lutz, Julia Vogel, Marin Karuza, Markus Kuster, K. Barth, G. Luzón, A. Liolios, A. Gardikiotis, Timur Rashba, A. Belov, S. Aune, T. Papaevangelou, E. Ferrer-Ribas, N. Elias, F. Haug, M. D. Hasinoff, Peter Friedrich, M Tsagri, I. Savvidis, Raimo Hartmann, H. Riege, Rainer Kotthaus, T. O. Niinikoski, J. M. Carmona, I. G. Irastorza, M. J. Pivovaroff, Dieter H. H. Hoffmann, A Rodríguez, Konstantin Zioutas, J. Morales, E. Gruber, J. A. Garcia, Krešimir Jakovčić, V. Lozza, K. Königsmann, L. Stewart, I. Giomataris, C. Eleftheriadis, A. Nordt, J. M. Laurent, A. Tomás, P. S. Silva, M. Arik, Ante Ljubičić, Javier Galan, Heinrich Bräuninger, Milica Krčmar, Serkant Ali Cetin, T. Guthörl, K. van Bibber, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR144760, Arık, Metin, B., Lakić, M., Arik, S., Aune, K., Barth, A., Belov, S., Borghi, H., Bräuninger, Cantatore, Giovanni, J. M., Carmona, S. A., Cetin, J. I., Collar, T., Dafni, M., Davenport, C., Eleftheriadi, N., Elia, C., Ezer, G., Fanouraki, E., Ferrer Riba, P., Friedrich, J., Galán, J. A., García, A., Gardikioti, E. N., Gazi, T., Gerali, I., Giomatari, S., Gninenko, H., Gómez, E., Gruber, T., Guthörl, R., Hartmann, F., Haug, M. D., Hasinoff, D. H. H., Hoffmann, F. J., Iguaz, I. G., Irastorza, J., Jacoby, K., Jakovčić, M., Karuza, K., Königsmann, R., Kotthau, M., Krčmar, M., Kuster, J. M., Laurent, A., Liolio, A., Ljubičić, V., Lozza, G., Lutz, G., Luzón, J., Morale, T., Niinikoski, A., Nordt, T., Papaevangelou, M. J., Pivovaroff, G., Raffelt, T., Rashba, H., Riege, A., Rodríguez, M., Rosu, J., Ruz, I., Savvidi, P. S., Silva, S. K., Solanki, L., Stewart, A., Tomá, M., Tsagri, K., van Bibber, T., Vafeiadi, J., Villar, J. K., Vogel, S. C., Yildiz, and K., Zioutas

Subjects
History, Particle physics, solar axion, Physics::Instrumentation and Detectors, 01 natural sciences, 7. Clean energy, Education, Nuclear physics, High Energy Physics::Theory, Phase I, Solar core, 0103 physical sciences, Buffer Gas, 010306 general physics, CERN Axion Solar Telescopes, Axion, Coupling constant, Physics, Coupling Constants, Helioscope, Various Densities, Large Hadron Collider, 010308 nuclear & particles physics, Axion Dark Matter Experiment, X-Rays, High Energy Physics::Phenomenology, Single photon detectors, Phase II, axions, solar physics, dark matter, Computer Science Applications, solar axions, Magnet, X-Ray, CERN Axion Solar Telescope
Abstract

Arık, Metin (Dogus Author) -- The conference paper was firstly submitted to 12th International Conference on Topics in Astroparticle and Underground Physics. The CERN Axion Solar Telescope (CAST) is currently the most sensitive axion helioscope designed to search for axions produced by the Primakoff process in the solar core. CAST is using a Large Hadron Collider (LHC) test magnet where axions could be converted into X-rays with energies up to 10 keV. During the phase I, the experiment operated with vacuum inside the magnet bores and covered axion masses up to 0.02 eV. In the phase II, the magnet bores were filled with a buffer gas (first 4He and later 3He) at various densities in order to extend the sensitivity to higher axion masses (up to f .18 eV). The phase II data taking was completed in 2011. So far, no evidence of axion signal has been found and CAST set the most restrictive experimental limit on the axion-photon coupling constant over a broad range of axion masses. The latest CAST results with 3He data in the mass range 0.39 eV < m a < 0.64 eV will be presented.

Published
2012
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16. Latest results and prospects of the CERN Axion Solar Telescope

Author

I. Giomataris, C. Eleftheriadis, T. Guthörl, S. C. Yildiz, José Villar, A. Tomás, G Lutz, I. G. Irastorza, F.J. Iguaz, Georgios Fanourakis, Biljana Lakić, L. Stewart, Javier Galan, S. Aune, Hector Gomez, J. M. Carmona, Marin Karuza, Dieter H. H. Hoffmann, V. Lozza, Milica Krčmar, Ante Ljubičić, K. Königsmann, M. Davenport, Theodoros Vafeiadis, E. Gruber, J. M. Laurent, Joachim Jacoby, S. Borghi, F. Haug, Timur Rashba, T. Papaevangelou, M. Tsagri, M. D. Hasinoff, I. Savvidis, Heinrich Bräuninger, P. S. Silva, M. Rosu, Peter Friedrich, M. J. Pivovaroff, Serkant Ali Cetin, T. Geralis, Konstantin Zioutas, T. O. Niinikoski, Giovanni Cantatore, S. N. Gninenko, K. van Bibber, A. Gardikiotis, Raimo Hartmann, J. Ruz, A. Liolios, N. Elias, Sami K. Solanki, Markus Kuster, A Nordt, E. Ferrer-Ribas, Julia Vogel, K. Barth, G. Luzón, H. Riege, C. Ezer, T. Dafni, A Rodríguez, Krešimir Jakovčić, Evangelos Gazis, Georg G. Raffelt, Regina Soufli, A. Belov, J. Morales, Rainer Kotthaus, J. I. Collar, I. G., Irastorza, S., Aune, K., Barth, A., Belov, S., Borghi, H., Bräuninger, Cantatore, Giovanni, J. M., Carmona, S. A., Cetin, J. I., Collar, T., Dafni, M., Davenport, C., Eleftheriadi, N., Elia, C., Ezer, G., Fanouraki, E., Ferrer Riba, P., Friedrich, J., Galán, A., Gardikioti, E. N., Gazi, T., Gerali, I., Giomatari, S., Gninenko, H., Gómez, E., Gruber, T., Guthörl, R., Hartmann, F., Haug, M. D., Hasinoff, D. H. H., Hoffmann, F. J., Iguaz, J., Jacoby, K., Jakovčić, M., Karuza, K., Königsmann, R., Kotthau, M., Krčmar, M., Kuster, B., Lakić, J. M., Laurent, A., Liolio, A., Ljubičić, Lozza, Valentina, G., Lutz, G., Luzón, J., Morale, T., Niinikoski, A., Nordt, T., Papaevangelou, M. J., Pivovaroff, G., Raffelt, T., Rashba, H., Riege, A., Rodríguez, M., Rosu, J., Ruz, I., Savvidi, P. S., Silva, S. K., Solanki, R., Soufli, L., Stewart, A., Tomá, M., Tsagri, Bibber, K. v. a. n., T., Vafeiadi, J., Villar, J. K., Vogel, S. C., Yildiz, K., Zioutas, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR3959, Çetin, Serkant Ali, Ezer, C., and Yıldız, Süleyman Cenk

Subjects
History, Particle physics, axions, Physics::Instrumentation and Detectors, Dark matter, 01 natural sciences, 7. Clean energy, dark matter, Education, Phase I, 0103 physical sciences, 010306 general physics, CERN Axion Solar Telescopes, Axion, Primakoff effect, solar physics, Physics, High Magnetic Fields, Helioscope, Large Hadron Collider, 010308 nuclear & particles physics, Axion Dark Matter Experiment, solar physic, Solar physics, Computer Science Applications, ddc, axion, CERN Axion Solar Telescope
Abstract

Çetin, Serkant Ali (Dogus Author) -- Ezer, C. (Dogus Author) -- Yıldız, Süleyman Cenk (Dogus Author) The CERN Axion Solar Telescope (CAST) experiment searches for axions from the Sun converted into few keV photons via the inverse Primakoff effect in the high magnetic field of a superconducting Large Hadron Collider (LHC) decommissioned test magnet. After results obtained with vacuum in the magnet pipes (phase I of the experiment) as well as with 4He the collaboration is now immersed in the data taking with 3He, to be finished in 2011. The status of the experiment will be presented, including a preliminary exclusion plot of the first 3He data. CAST is currently sensitive to realistic QCD axion models at the sub-eV scale, and with axion-photon couplings down to the ∼ 2 × 10-10 GeV -1, compatible with solar life limits. Future plans include revisiting vaccuum and 4He configurations with improved sensitivity, as well as possible additional search for non-standard signals from chamaleons, paraphotons or other WISPs. For the longer term, we study the feasibility of an altogether improved version of the axion helioscope concept, with a jump in sensitivity of about one order of magnitude in gaγ beyond CAST.

Published
2011

17. Probing the eV-Mass range for solar axions with CAST

Author

S Aune, K Barth, A Belov, S Borghi, H Brauninger, G Cantatore, J M Carmona, S A Cetin, J I Collar, T Dafni, M Davenport, C Eleftheriadis, N Elias, C Ezer, G Fanourakis, E Ferrer-Ribas, H Fischer, J Franz, P Friedrich, J Galan, A Gardikiotis, E N Gazis, T Geralis, I Giomataris, S Gninenko, H Gomez, E Gruber, T Guthorl, R Hartmann, F Haug, M D Hasinoff, D H H Hoffmann, F J Iguaz, I G Irastorza, J Jacoby, K Jakovcic, D Kang, T Karageorgopoulou, M Karuza, K Konigsmann, R Kotthaus, M Krcmar, K Kousouris, M Kuster, B Lakic, P Lang, C Lasseur, J M Laurent, A Liolios, A Ljubicic, V Lozza, G Lutz, G Luzon, D W Miller, A Mirizzi, J Morales, T Niinikoski, A Nordt, T Papaevangelou, M J Pivovaroff, G Raiteri, G Raffelt, T Rashba, H Riege, A Rodriguez, M Rosu, J Ruz, I Savvidis, Y Semertzidis, P Serpico, P S Silva, S K Solanki, R Soufli, L Stewart, A Tomas, M Tsagri, K van Bibber, T Vafeiadis, J Villar, Julia K Vogel, L Walckiers, Y Y Y Wong, S C Yildiz, K Zioutas, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR3959, TR144753, Çetin, Serkant Ali, Yıldız, Süleyman Cenk, S., Aune, K., Barth, A., Belov, S., Borghi, H., Brauninger, Cantatore, Giovanni, J. M., Carmona, S. A., Cetin, J. I., Collar, T. Dafni M., Davenport, C., Eleftheriadi, N., Elia, C., Ezer, G., Fanouraki, E., Ferrer Riba, H., Fischer, J., Franz, P., Friedrich, J., Galan, A., Gardikioti, E. N., Gazi, T., Gerali, I., Giomatari, S., Gninenko, H., Gomez, E., Gruber, T., Guthorl, R., Hartmann, F., Haug, M. D., Hasinoff, D. H. H., Hoffmann, F. J., Iguaz, I. G., Irastorza, J., Jacoby, K., Jakovcic, D., Kang, T., Karageorgopoulou, M., Karuza, K., Konigsmann, R., Kotthau, M., Krcmar, K., Kousouri, M., Kuster, B., Lakic, P., Lang, C., Lasseur, J. M., Laurent, A., Liolio, A., Ljubicic, V., Lozza, G., Lutz, G., Luzon, D. W., Miller, A., Mirizzi, J., Morale, T., Niinikoski, A., Nordt, T., Papaevangelou, M. J., Pivovaroff, G., Raiteri, G., Raffelt, T., Rashba, H., Riege, A., Rodriguez, M., Rosu, J., Ruz, I., Savvidi, Y., Semertzidi, P., Serpico, P. S., Silva, S. K., Solanki, R., Soufli, L., Stewart, A., Toma, M., Tsagri, K., Van Bibber, T., Vafeiadi, J., Villar, J. K., Vogel, L., Walckier, Y. Y. Y., Wong, S. C., Yildiz, and K., Zioutas

Subjects
Particle physics, solar axion, Second Phase, Physics::Instrumentation and Detectors, Dark matter, dark matter, X-ray Detector, Helium Gas, Phase Spaces, Current Status, Dark Matter, CERN Axion Solar Telescopes, Axion, Primakoff effect, Coupling Constants, Physics, Large Hadron Collider, Mass Regions, Axion Dark Matter Experiment, Gas Density Distribution, Solar Axions, Upper Limits, X-ray Photons, Massless particle, Strong CP Problem, solar axions, Photon detection, Strong CP problem, CERN Axion Solar Telescope, High Pressure
Abstract

Çetin, Serkant Ali (Dogus Author) -- Yıldız, Süleyman Cenk (Dogus Author) -- Conference full title: 2010 IEEE Nuclear Science Symposium conference record (NSS/MIC 2010) : [including the 2010 IEEE Nuclear Science Symposium, Medical Imaging Conference, and the 17th International Workshop on Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors (RTSD)]; Knoxville, Tennessee, USA, 30 October - 6 November 2010 The CERN Axion Solar Telescope (CAST) is searching for solar axions which could be produced in the core of the Sun via the so-called Primakoff effect. Not only would these hypothetical particles solve the strong CP problem, but they are also one of the favored candidates for dark matter. In order to look for axions originating from the Sun, CAST uses a decommissioned LHC prototype magnet. In its 10 m long magnetic field region of 9 Tesla, axions could be reconverted into X-ray photons. Different X-ray detectors are installed on both ends of the magnet, which is mounted on a structure built to follow the Sun during sunrise and sunset for a total of about 3 hours per day. The analysis of the data acquired during the first phase of the experiment with vacuum in the magnetic field region yielded the most restrictive experimental upper limit on the axion-to-photon coupling constant for axion masses up to about 0.02 eV. In order to extend the sensitivity of the experiment to a wider mass range, the CAST experiment continues its search for axions with helium in the magnet bores. In this way it is possible to restore coherence of conversion for larger masses. Changing the pressure of the helium gas enables the experiment to scan different axion masses in the range of up to about 1.2 eV. Especially at high pressures, a precise knowledge of the gas density distribution is crucial to obtain accurate results. In the first part of this second phase of CAST, 4He was used and the axion mass region was extended up to 0.39 eV, a part of phase space favored by axion models. In CAST's ongoing 3He phase the studied mass range is now being extended further. In this contribution the final results of CAST's 4He phase will be presented and the current status of the 3He run will be given. This includes latest results as well as prospects of future axion experiments. Nucl. Plasma Sci. Soc. Inst. Electr. Electron. Eng. (NPSS)

Published
2010
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18. Search for chameleons with CAST

Author

J. I. Collar, M. Arik, F.J. Iguaz, Milica Krčmar, Javier Galan, Philippe Brax, José Villar, S. C. Yildiz, Marin Karuza, Julia Vogel, K. Barth, G. Luzón, Biljana Lakić, M. Davenport, M. Kavuk, I. Ortega, Joachim Jacoby, Heinrich Bräuninger, Serkant Ali Cetin, T. Geralis, Georg G. Raffelt, E. Ferrer-Ribas, M. Rosu, H. Riege, T. Papaevangelou, J. G. Garza, Theodoros Vafeiadis, A. Belov, I. G. Irastorza, S. Aune, A. Gardikiotis, Krešimir Jakovčić, F. Haug, I. Savvidis, J. M. Laurent, Dieter H. H. Hoffmann, Peter Friedrich, S. Neff, Charles J. Hailey, M. J. Pivovaroff, Konstantin Zioutas, T. Dafni, Vassilis Anastassopoulos, J. Ruz, I. Giomataris, Klaus Kurt Desch, I. Lavrentyev, Finn Erland Christensen, C. Eleftheriadis, Ante Ljubičić, A. V. Dermenev, A. Upadhye, C. Krieger, Sami K. Solanki, J. M. Carmona, M. D. Hasinoff, Georgios Fanourakis, G. Cantatore, Evangelos Gazis, Jochen Kaminski, Anders Clemen Jakobsen, A. Krüger, A. Liolios, J. A. Garcia, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR3959, Çetin, Serkant Ali, Anastassopoulos, V, Arik, M., Aune, S., Barth, K., Belov, A., Bräuninger, H., Cantatore, Giovanni, Carmona, J. M., Cetin, S. A., Christensen, F., Collar, J. I., Dafni, T., Davenport, M., Desch, K., Dermenev, A., Eleftheriadis, C., Fanourakis, G., Ferrer Ribas, E., Friedrich, P., Galán, J., García, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Geralis, T., Giomataris, I., Hailey, C., Haug, F., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jacoby, J., Jakobsen, A., Jakovčić, K., Kaminski, J., Karuza, M., Kavuk, M., Krčmar, M., Krieger, C., Krüger, A., Lakić, B., Laurent, J. M., Liolios, A., Ljubičić, A., Luzón, G., Neff, S., Ortega, I., Papaevangelou, T., Pivovaroff, M. J., Raffelt, G., Riege, H., Rosu, M., Ruz, J., Savvidis, I., Solanki, S. K., Vafeiadis, T., Villar, J. A., Vogel, J. K., Yildiz, S. C., Zioutas, K., Brax, P., Lavrentyev, I., and Upadhye, A.

Subjects
Nuclear and High Energy Physics, Astrophysics and Astronomy, Photon, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, Tachocline, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, SDD, X-ray, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Chameleon, Dark energy, 010306 general physics, Axion, Solar and Stellar Astrophysics (astro-ph.SR), Primakoff effect, Coupling constant, Coupling, Physics, CAST, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), lcsh:QC1-999, High Energy Physics - Phenomenology, Astrophysics - Solar and Stellar Astrophysics, CERN Axion Solar Telescope, lcsh:Physics
Abstract

In this work we present a search for (solar) chameleons with the CERN Axion Solar Telescope (CAST). This novel experimental technique, in the field of dark energy research, exploits both the chameleon coupling to matter ($\beta_{\rm m}$) and to photons ($\beta_{\gamma}$) via the Primakoff effect. By reducing the X-ray detection energy threshold used for axions from 1$\,$keV to 400$\,$eV CAST became sensitive to the converted solar chameleon spectrum which peaks around 600$\,$eV. Even though we have not observed any excess above background, we can provide a 95% C.L. limit for the coupling strength of chameleons to photons of $\beta_{\gamma}\!\lesssim\!10^{11}$ for $1, Comment: 8 pages, 12 figures

Published
2015
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19. Low Background Micromegas in CAST

Author

Javier Galan, S. Aune, F.J. Iguaz, A. Tomás, Julia Vogel, I. G. Irastorza, D. Calvet, D. Jourde, J. G. Garza, M. Davenport, F. Aznar, E. Ferrer-Ribas, R. M. Hill, T. Decker, M. J. Pivovaroff, T. Dafni, H. Mirallas, Ioannis Giomataris, Anders Clemen Jakobsen, J. F. Castel, Theodoros Vafeiadis, J. Ruz, Finn Erland Christensen, T. Papaevangelou, I. Ortega, and J. A. Garcia

Subjects
Physics, History, Helioscope, Particle physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, Canfranc Underground Laboratory, Detector, FOS: Physical sciences, MicroMegas detector, Instrumentation and Detectors (physics.ins-det), First generation, Computer Science Applications, Education, Observatory, Detectors and Experimental Techniques, Nuclear Experiment (nucl-ex), CERN Axion Solar Telescope, Axion, Nuclear Experiment
Abstract

Solar axions could be converted into x-rays inside the strong magnetic field of an axion helioscope, triggering the detection of this elusive particle. Low background x-ray detectors are an essential component for the sensitivity of these searches. We report on the latest developments of the Micromegas detectors for the CERN Axion Solar Telescope (CAST), including technological pathfinder activities for the future International Axion Observatory (IAXO). The use of low background techniques and the application of discrimination algorithms based on the high granularity of the readout have led to background levels below 10$^{-6}$ counts/keV/cm$^2$/s, more than a factor 100 lower than the first generation of Micromegas detectors. The best levels achieved at the Canfranc Underground Laboratory (LSC) are as low as 10$^{-7}$ counts/keV/cm$^2$/s, showing good prospects for the application of this technology in IAXO. The current background model, based on underground and surface measurements, is presented, as well as the strategies to further reduce the background level. Finally, we will describe the R&D paths to achieve sub-keV energy thresholds, which could broaden the physics case of axion helioscopes., 6 pages, 3 figures, Large TPC Conference 2014, Paris

Published
2015
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20. The IAXO Helioscope

Author

I. Savvidis, I. G. Irastorza, I. Ortega, Toyokazu Sekiguchi, K Saikawa, M. Davenport, Serkant Ali Cetin, C. Eleftheriadis, C. Krieger, D. Chelouche, O. Limousin, Charles J. Hailey, P. Vedrine, G. Fanourakis, S. Caspi, Gianpaolo Carosi, Javier Redondo, A. Tomás, Ioannis Giomataris, Javier Galan, Hector Gomez, Pierre Sikivie, A.C. Jakobsen, S. Russenschuck, J. G. Garza, F.J. Iguaz, Kenichi Imai, K. van Bibber, Pierre Brun, Marin Karuza, A. Dael, Takashi Hiramatsu, S. Gninenko, A. Lindner, M. Betz, Dieter H. H. Hoffmann, A. Liolios, Jochen Kaminski, E. Ferrer Ribas, Theodoros Geralis, V. N. Muratova, Julia Vogel, Yannis K. Semertzidis, Theodoros Vafeiadis, Babette Döbrich, Sergey Troitsky, G. Luzón, A. V. Derbin, D. González-Díaz, Michael J. Pivovaroff, F. T. Avignone, J. A. Garcia, Joerg Jaeckel, Amanda Weltman, W. C. Wester, Georg G. Raffelt, Masahiro Kawasaki, A. Dudarev, Andreas Ringwald, Krešimir Jakovčić, T. Dafni, Milica Krčmar, J.A. Villar, A. Diago, Eduardo Guendelman, Konstantin Zioutas, Dieter Horns, Klaus Kurt Desch, J. Ruz, J. M. Carmona, Giovanni Cantatore, Benito Gimeno, F.E. Christensen, P. Brax, T. Papaevangelou, L. Walckiers, Jordi Isern, Konstantinos Kousouris, I. Dratchnev, I. Shilon, Fritz Caspers, C. Nones, S. Matsuki, S. C. Yildiz, Biljana Lakić, H. H. J. ten Kate, E. Armengaud, H. Silva, Ribas, E. Ferrer, Armengaud, E., Avignone, F. T., Betz, M., Brax, P., Brun, P., Cantatore, Giovanni, Carmona, J. M., Carosi, G. P., Caspers, F., Caspi, S., Cetin, S. A., Chelouche, D., Christensen, F. E., Dael, A., Dafni, T., Davenport, M., Derbin, A. V., Desch, K., Diago, A., Döbrich, B., Dratchnev, I., Dudarev, A., Eleftheriadis, C., Fanourakis, G., Galán, J., García, J. A., Garza, J. G., Geralis, T., Gimeno, B., Giomataris, I., Gninenko, S., Gómez, H., González Diaz, D., Guendelman, E., Hailey, C. J., Hiramatsu, T., Hoffmann, D. H. H., Horns, D., Iguaz, F. J., Irastorza, I. G., Isern, J., Imai, K., Jaeckel, J., Jakobsen, A. C., Jakovčić, K., Kaminski, J., Kawasaki, M., Karuza, M., Krčmar, M., Kousouris, K., Krieger, C., Lakić, B., Limousin, O., Lindner, A., Liolios, A., Luzón, G., Matsuki, S., Muratova, V. N., Nones, C., Ortega, I., Papaevangelou, T., Pivovaroff, M. J., Raffelt, G., Redondo, J., Ringwald, A., Russenschuck, S., Ruz, J., Saikawa, K., Savvidis, I., Sekiguchi, T., Semertzidis, Y. K., Shilon, I., Sikivie, P., Silva, H., Ten Kate, H. H. J., Tomas, A., Troitsky, S., Vafeiadis, T., Van Bibber, K., Vedrine, P., Villar, J. A., Vogel, J. K., Walckiers, L., Weltman, A., Wester, W., Yildiz, S. C., Zioutas, K., Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR3959, and Çetin, Serkant Ali

Subjects
History, Particle physics, QCD axion, Dark matter, X-ray optics, Detectable Signal, 7. Clean energy, magnetic helioscope, dark matter, Education, Solar tracker, Optics, QCD axions, ddc:530, Detectors and Experimental Techniques, Axion, Physics, Helioscope, Fourth Generation, business.industry, Technical Design, Detector, MicroMegas detector, Toroidal Magnets, Low Background Detectors, Computer Science Applications, Magnet, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, Feasibility Studies, X-ray Focusing Optics, business
Abstract

Çetin, Serkant Ali (Dogus Author) -- Conference full title: 7th International Symposium on Large TPCs for Low-Energy Rare Event Detection; Institute of Astroparticle Physics (APC) Campus - Paris Diderot UniversityParis; France; 15 December 2014 through 17 December 2014 The IAXO (International Axion Experiment) is a fourth generation helioscope with a sensitivity, in terms of detectable signal counts, at least 104 better than CAST phase-I, resulting in sensitivity on gaγ one order of magnitude better. To achieve this performance IAXO will count on a 8-coil toroidal magnet with 60 cm diameter bores and equipped with X-ray focusing optics into 0.20 cm2 spots coupled to ultra-low background Micromegas X-ray detectors. The magnet will be on a platform that will allow solar tracking for 12 hours per day. The next short term objectives are to prepare a Technical Design Report and to construct the first prototypes of the hardware main ingredients: demonstration coil, X-ray optics and low background detector while refining the physics case and studying the feasibility studies for Dark Matter axions.

Published
2015
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21. Search for Solar Axions by the CERN Axion Solar Telescope withHe3Buffer Gas: Closing the Hot Dark Matter Gap

Author

M. Tsagri, T. Guthörl, M. Gomez Marzoa, S. C. Yildiz, J. G. Garza, T. Dafni, M. Davenport, S. Borghi, J. M. Laurent, M. D. Hasinoff, Steffen Hauf, N. Elias, P. S. Silva, Sami K. Solanki, S. Aune, Joachim Jacoby, Markus Kuster, Evangelos Gazis, T. Vafeiadis, F.J. Iguaz, P. M. Lang, E. Da Riva, Peter Friedrich, A. Liolios, Dieter H. H. Hoffmann, Georg G. Raffelt, T. O. Niinikoski, Georgios Fanourakis, M. J. Pivovaroff, Konstantin Zioutas, A. Nordt, C. Eleftheriadis, Ioannis Giomataris, Heinrich Bräuninger, J. Ruz, T. Geralis, Serkant Ali Cetin, Milica Krčmar, K. Königsmann, G. Cantatore, Ante Ljubičić, J. I. Collar, Biljana Lakić, T. Papaevangelou, J. M. Carmona, I. Savvidis, K. van Bibber, S. Neff, A. Tomás, E. Georgiopoulou, S. N. Gninenko, M. Arik, E. Gruber, A. Belov, Javier Galan, Rainer Kotthaus, F. Haug, A Rodríguez, L. Stewart, J. A. Garcia, Hector Gomez, Marin Karuza, E. Ferrer-Ribas, I. G. Irastorza, H. Riege, A. Gardikiotis, Raimo Hartmann, Julia Vogel, K. Barth, G. Luzón, Krešimir Jakovčić, M. Rosu, I. Shilon, and José Villar

Subjects
Physics, Helioscope, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Axion Dark Matter Experiment, Hot dark matter, Buffer gas, Dark matter, General Physics and Astronomy, Astrophysics, 7. Clean energy, 01 natural sciences, Observatory, 0103 physical sciences, Astrophysics::Earth and Planetary Astrophysics, 010306 general physics, CERN Axion Solar Telescope, Axion
Abstract

The CERN Axion Solar Telescope has finished its search for solar axions with He-3 buffer gas, covering the search range 0.64 eV less than or similar to ma less than or similar to 1.17 eV. This closes the gap to the cosmological hot dark matter limit and actually overlaps with it. From the absence of excess x rays when the magnet was pointing to the Sun we set a typical upper limit on the axion-photon coupling of g(a gamma) less than or similar to 3.3 x 10(-10) GeV-1 at 95% C.L., with the exact value depending on the pressure setting. Future direct solar axion searches will focus on increasing the sensitivity to smaller values of g(a gamma), for example by the currently discussed next generation helioscope International AXion Observatory.

Published
2014
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22. The TPC shielding of the CAST experiment

Author

G. Luzón, I. G. Irastorza, José Villar, J. M. Carmona, A. Ortiz de Solórzano, Hector Gomez, J. Ruz, J. Morales, S. Cebrián, B. Beltrán, and A Rodríguez

Subjects
Physics, History, Physics::Instrumentation and Detectors, Detector, Signal, Computer Science Applications, Education, Magnetic field, Nuclear physics, Magnet, Electromagnetic shielding, Nuclear Experiment, CERN Axion Solar Telescope, Axion
Abstract

Sunset solar axions traversing the intense magnetic field of the CERN Axion Solar Telescope (CAST) experiment may be detected in a TPC detector, placed at one side of the magnet, as point-like X-rays signals. This signal could be masked, however, by the inhomogeneous radioactive background of materials and experimental site. Here we present the shielding built to reduce and homogenize the radioactive background levels of the TPC detector.

Published
2006
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23. First results from the CAST experiment

Author

A. Liolios, D. Autiero, H. Riege, Louis Walckiers, B. Beltrán, Markus Kuster, D. Kang, N. Goloubev, Joachim Jacoby, K. Barth, G. Luzón, M.L. Sarsa, T. Dafni, J. Morales, A. Placci, I. Savvidis, Heinrich Bräuninger, Milica Krčmar, S. Aune, H. Fischer, W. Serber, I. G. Irastorza, Dieter H. H. Hoffmann, Yannis K. Semertzidis, L. Di Lella, Ante Ljubičić, E. Chesi, Peter Friedrich, V. Arsov, S. N. Gninenko, Konstantin Zioutas, T. Geralis, Pasquale D. Serpico, M. Davenport, Jakob Englhauser, J. Franz, Joaquin Vieira, David Miller, S. Cebrián, I. Giomataris, C. Eleftheriadis, G. Lutz, Biljana Lakić, Thomas Papaevangelou, S. Andriamonje, José Villar, A. Morales, K. Königsmann, J. I. Collar, C. Lasseur, A. Belov, Rainer Kotthaus, J. Ruz, Konstantinos Kousouris, L. Stewart, Georg G. Raffelt, M. D. Hasinoff, F. H. Heinsius, Georgios Fanourakis, J. M. Carmona, A. Ortiz, and Efrain J. Ferrer

Subjects
Coupling, Physics, History, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Transverse field, High Energy Physics::Phenomenology, Buffer gas, Phase (waves), Computer Science Applications, Education, Nuclear physics, Magnet, CERN Axion Solar Telescope, Axion
Abstract

The CAST Experiment commenced its first phase of solar axion-searching in 2003, and ran successfully for two years. In the transverse field of a decommissioned Large Hadron Collider (LHC) test magnet (9.26m, 9T), the CERN Axion Solar Telescope intends to transform axions -that would be produced in the sun- into X-rays with energies of a few keV. The first results from the analysis of the data taken in 2003 show no signature of axions, implying an upper limit to the axion-photon coupling gaγ ≤ 1.16 × 10−10 GeV−1 at 95% C.L. for ma < 0.02 eV, already a factor 100 better than previous searches. In Phase I the twin bores of the magnet were kept in vacuum. In Phase II (due to start in November 2005) the bores of the magnet will be filled with a buffer gas, which will allow CAST to explore the region of higher axion masses.

Published
2006
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24. Conceptual design of the International Axion Observatory (IAXO)

Author

A. Liolios, P. Vedrine, G. Fanourakis, Doron Chelouche, Klaus Kurt Desch, Serkant Ali Cetin, I. G. Irastorza, Konstantin Zioutas, Gianpaolo Carosi, Javier Redondo, I. Dratchnev, Ken'ichi Saikawa, Ioannis Giomataris, B. Gimeno, Pierre Brun, Eduardo Guendelman, A. Dael, B. Döbrich, S. Gninenko, E. Ferrer-Ribas, C. Krieger, L. Walckiers, J. Ruz, J. A. García, S. Matsuki, Milica Krčmar, I. Shilon, S. Russenschuck, Kenichi Imai, J.A. Villar, I. Ortega, A. Diago, J. Galán, Sergey Troitsky, V. N. Muratova, Joerg Jaeckel, I. Savvidis, Ph. Brax, Amanda Weltman, H. Silva, C. Nones, Charles J. Hailey, Haley Louise Gomez, Dieter Horns, K. van Bibber, Krešimir Jakovčić, S. C. Yildiz, Olivier Limousin, Jordi Isern, Finn Erland Christensen, T. Vafeiadis, William Wester, C. Eleftheriadis, Michael J. Pivovaroff, Theodoros Geralis, Biljana Lakić, Julia Vogel, A. Dudarev, Andreas Ringwald, Fritz Caspers, A. V. Derbin, K. Kousouris, G. Luzón, T. Papaevangelou, J. M. Carmona, J. Kaminski, Anders Clemen Jakobsen, H. H. J. ten Kate, T. Dafni, A. Lindner, M. Betz, Georg G. Raffelt, Marin Karuza, S. Caspi, Masahiro Kawasaki, Giovanni Cantatore, Eric Armengaud, J. G. Garza, F.J. Iguaz, F. T. Avignone, A. Tomás, T. Sekiguchi, M. Davenport, Pierre Sikivie, Takashi Hiramatsu, Dieter H. H. Hoffmann, Diego González-Díaz, Yannis K. Semertzidis, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR3959, Çetin, Serkant Ali, Armengaud, E., Avignone, F. T., Betz, M., Brax, P., Brun, P., Cantatore, Giovanni, Carmona, J. M., Carosi, G. P., Caspers, F., Caspi, S., Cetin, S. A., Chelouche, D., Christensen, F. E., Dael, A., Dafni, T., Davenport, M., Derbin, A. V., Desch, K., Diago, A., Döbrich, B., Dratchnev, I., Dudarev, A., Eleftheriadis, C., Fanourakis, G., Ferrer Ribas, E., Galán, J., García, J. A., Garza, J. G., Geralis, T., Gimeno, B., Giomataris, I., Gninenko, S., Gómez, H., Gonźlez Díaz, D., Guendelman, E., Hailey, C. J., Hiramatsu, T., Hoffmann, D. H. H., Horns, D., Iguaz, F. J., Irastorza, I. G, Isern, J., Imai, K., Jakobsen, A. C., Jaeckel, J., Jakovčić, K., Kaminski, J., Kawasaki, M., Karuza, M., Krčmar, M., Kousouris, K., Krieger, C., Lakić, B., Limousin, O., Lindner, A., Liolios, A., Luzón, G., Matsuki, S., Muratova, V. N., Nones, C., Ortega, I., Papaevangelou, T., Pivovaroff, M. J., Raffelt, G., Redondo, J., Ringwald, A., Russenschuck, S., Ruz, J., Saikawa, K., Savvidis, I., Sekiguchi, T., Semertzidis, Y. K., Shilon, I., Sikivie, P., Silva, H., Kate, H. Ten, Tomas, A., Troitsky, S., Vafeiadis, T., Bibber, K. Van, Vedrine, P., Villar, J. A., Vogel, J. K., Walckiers, L., Weltman, A., Wester, W., Yildiz, S. C., and Zioutas, K.

Subjects
MICROPIC, Physics - Instrumentation and Detectors, Photon, axions, Parameter space, 7. Clean energy, High Energy Physics - Experiment, Dark Matter detectors (WIMPs, axions, etc.), High Energy Physics - Experiment (hep-ex), Observatory, etc.), Micropattern gaseous detectors (MSGC, GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, InGrid, etc), Detectors and Experimental Techniques, Instrumentation, Mathematical Physics, Physics, GEM, solar [axion], Dark Matter Detectors (Wimps, Axions, etc.), MicroMegas detector, X-ray detectors, Instrumentation and Detectors (physics.ins-det), Large detector systems for particle and astroparticle physics, solar, observatory, MICROMEGAS, MHSP, axion-like particles, proposed experiment, dark matter detectors, x-ray detectors, Micropattern gaseous detectors, large detector systems for particle and astroparticle physics, Micromegas, X-ray detector, Particle physics, optics [X-ray], FOS: Physical sciences, Superconducting magnet, Micropattern gaseous detectors (MSGC, ddc:610, Axion, activity report, Dark Matter detectors (WIMPs, superconductivity [magnet], etc), Helioscope, sensitivity, InGrid, RETHGEM, Orders of magnitude (time), axion, Large detector systems for particle and astroparticle physic, THGEM, Micropattern Gaseous Detectors (MSGC, Gem, THGEM, Rethgem, MHSP, Micropic, Micromegas, In Grid
Abstract

The International Axion Observatory (IAXO) will be a forth generation axion helioscope. As its primary physics goal, IAXO will look for axions or axion-like particles (ALPs) originating in the Sun via the Primakoff conversion of the solar plasma photons. In terms of signal-to-noise ratio, IAXO will be about 4-5 orders of magnitude more sensitive than CAST, currently the most powerful axion helioscope, reaching sensitivity to axion-photon couplings down to a few $\times 10^{-12}$ GeV$^{-1}$ and thus probing a large fraction of the currently unexplored axion and ALP parameter space. IAXO will also be sensitive to solar axions produced by mechanisms mediated by the axion-electron coupling $g_{ae}$ with sensitivity $-$for the first time$-$ to values of $g_{ae}$ not previously excluded by astrophysics. With several other possible physics cases, IAXO has the potential to serve as a multi-purpose facility for generic axion and ALP research in the next decade. In this paper we present the conceptual design of IAXO, which follows the layout of an enhanced axion helioscope, based on a purpose-built 20m-long 8-coils toroidal superconducting magnet. All the eight 60cm-diameter magnet bores are equipped with focusing x-ray optics, able to focus the signal photons into $\sim 0.2$ cm$^2$ spots that are imaged by ultra-low-background Micromegas x-ray detectors. The magnet is built into a structure with elevation and azimuth drives that will allow for solar tracking for $\sim$12 h each day., Comment: 47 pages, submitted to JINST

Published
2014
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25. CAST constraints on the axion-electron coupling

Author

M. D. Hassinoff, Joaquin Vieira, G. Lutz, Krešimir Jakovčić, Javier Redondo, K. Königsmann, J. A. Garcia, H. Fischer, J. M. Carmona, I. G. Irastorza, Julia Vogel, Biljana Lakić, Dieter Hoffmann, K. Barth, G. Luzón, Javier Galan, C. Eleftheriadis, A. Liolios, J. Franz, I. Giomataris, H. Riege, K. van Bibber, D. Kang, Milica Krčmar, David Miller, J.A. Villar, L. Stewart, E. Ferrer Ribas, B. Beltrán, M. Davenport, Peter Friedrich, Heinrich Bräuninger, M. J. Pivovaroff, Konstantin Zioutas, Adriane De Assis Lawisch Rodriguez, T. Papaevangelou, L. Di Lella, Jakob Englhauser, F. H. Heinsius, Georgios Fanourakis, Sergei Gninenko, Konstantinos Kousouris, Yannis K. Semertzidis, J. Ruz, Joachim Jacoby, T. Geralis, Hector Gomez, T. Dafni, Louis Walckiers, Markus Kuster, Ante Ljubičić, I. Savvidis, Georg G. Raffelt, A. Belov, Rainer Kotthaus, and J. I. Collar

Subjects
Particle physics, Astrophysics and Astronomy, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, pacs:97.10.Me, Astrophysics, Electron, 01 natural sciences, High Energy Physics::Theory, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, ddc:530, 010306 general physics, pacs:14.80.Mz, Axion, axions, dark matter experiments, solar physics, white and brown dwarfs, Solar and Stellar Astrophysics (astro-ph.SR), Coupling, Physics, Helioscope, pacs:97.20.Rp, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Compton scattering, Bremsstrahlung, Yukawa potential, Astronomy and Astrophysics, pacs:97.10.Ld, High Energy Physics - Phenomenology, Astrophysics - Solar and Stellar Astrophysics
Abstract

In non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces a strong axion flux by bremsstrahlung, Compton scattering, and axio-recombination, the "BCA processes." Based on a new calculation of this flux, including for the first time axio-recombination, we derive limits on the axion-electron Yukawa coupling g_ae and axion-photon interaction strength g_ag using the CAST phase-I data (vacuum phase). For m_a < 10 meV/c2 we find g_ag x g_ae< 8.1 x 10^-23 GeV^-1 at 95% CL. We stress that a next-generation axion helioscope such as the proposed IAXO could push this sensitivity into a range beyond stellar energy-loss limits and test the hypothesis that white-dwarf cooling is dominated by axion emission. In non-hadronic axion models, which have a tree-level axion-electron interaction, the Sun produces a strong axion flux by bremsstrahlung, Compton scattering, and axio-recombination, the ``BCA processes.'' Based on a new calculation of this flux, including for the first time axio-recombination, we derive limits on the axion-electron Yukawa coupling gae and axion-photon interaction strength ga(γ) using the CAST phase-I data (vacuum phase). For malesssim10 meV/c(2) we find ga(γ) gae

Published
2013

26. Rare event searches based on micromegas detectors: The T-REX project

Author

I. Giomataris, A. Gardikiotis, A Rodríguez, J. G. Garza, J. Ruz, T. Papaevangelou, J. A. Garcia, S. C. Yildiz, A. Tomás, G. Luzón, Javier Galan, Georgios Fanourakis, T. Dafni, Theodoros Vafeiadis, Hector Gomez, F.J. Iguaz, T. Geralis, L. Segui, S. Aune, S. Cebrián, D.C. Herrera, I. G. Irastorza, E. Ferrer-Ribas, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, and Yıldız, Süleyman Cenk

Subjects
Physics, Micromegas Detector, History, Particle physics, Helioscope, 010308 nuclear & particles physics, Gain Stability, Detector, MicroMegas detector, Rare Event, 01 natural sciences, Computer Science Applications, Education, Time Projection Chambers, Double beta decay, 0103 physical sciences, Rare events, Energy Resolutions, 010306 general physics, Double Beta Decay, Axion, Micromegas
Abstract

Yıldız, Süleyman Cenk (Dogus Author) -- The conference paper was firstly submitted to 12th International Conference on Topics in Astroparticle and Underground Physics. Micromegas readouts are an attractive option for many of the rare event searches, due to their performance regarding energy resolution, gain stability, homogeneity and material budget. The T-REX project aims at developing further these novel readout techniques for Time Projection Chambers and their potential use in experiments searching for rare events. Here we will refer to the latest results regarding the use and prospects of Micromegas read-outs in axion physics (CAST and the future helioscope), as well as the R&D carried out within NEXT, to search for the neutrinoless double-beta decay.

Published
2012

27. Search for Sub-eV Mass Solar Axions by the CERN Axion Solar Telescope withHe3Buffer Gas

Author

K. Königsmann, T. Dafni, J. M. Laurent, Joachim Jacoby, Sergei Gninenko, Milica Krčmar, Ante Ljubičić, Biljana Lakić, Hector Gomez, F. Haug, Marin Karuza, Evangelos Gazis, T. Guthörl, C. Eleftheriadis, H. Riege, J. Morales, A. Liolios, N. Elias, Heinrich Bräuninger, José Villar, Serkant Ali Cetin, G. Lutz, S. Aune, A. Tomás, A. Nordt, V. Lozza, M. Arik, T. Geralis, I. Giomataris, K. van Bibber, T. Papaevangelou, I. Savvidis, Javier Galan, Dieter Hoffmann, M. Tsagri, J. Ruz, Sami K. Solanki, J. A. Garcia, M. Rosu, Markus Kuster, Krešimir Jakovčić, T. O. Niinikoski, Peter Friedrich, P. S. Silva, M. J. Pivovaroff, Konstantin Zioutas, A. Gardikiotis, M. Davenport, Raimo Hartmann, Julia Vogel, J. I. Collar, Theodoros Vafeiadis, K. Barth, G. Luzón, Adriane De Assis Lawisch Rodriguez, E. Ferrer-Ribas, C. Ezer, A. Belov, Rainer Kotthaus, L. Stewart, I. G. Irastorza, Georg G. Raffelt, Georgios Fanourakis, S. C. Yildiz, Timur Rashba, M. D. Hasinoff, J. M. Carmona, E. Gruber, S. Borghi, Giovanni Cantatore, and F.J. Iguaz

Subjects
Physics, Helioscope, Particle physics, Solar energetic particles, 010308 nuclear & particles physics, Hot dark matter, Dark matter, General Physics and Astronomy, Astrophysics, 01 natural sciences, 7. Clean energy, Massless particle, 0103 physical sciences, Strong CP problem, 010306 general physics, CERN Axion Solar Telescope, Axion
Abstract

The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using (3)He as a buffer gas. At T=1.8 K this allows for larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with (4)He. With about 1 h of data taking at each of 252 different pressure settings we have scanned the axion mass range 0.39 eV≲m(a)≲0.64 eV. From the absence of excess x rays when the magnet was pointing to the Sun we set a typical upper limit on the axion-photon coupling of g(aγ)≲2.3×10(-10) GeV(-1) at 95% C.L., the exact value depending on the pressure setting. Kim-Shifman-Vainshtein-Zakharov axions are excluded at the upper end of our mass range, the first time ever for any solar axion search. In the future we will extend our search to m(a)≲1.15 eV, comfortably overlapping with cosmological hot dark matter bounds.

Published
2011
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28. Status of R&D on Micromegas for Rare Event Searches: The T-REX project

Author

Alicia Rodríguez, L. Segui, J. G. Garza, G. Fanourakis, A. Ortiz, Haley Louise Gomez, J.P. Mols, S. C. Yildiz, Theodoros Geralis, Thomas Papaevangelou, D.C. Herrera, S. Cebrián, G. Luzón, L. Esteban, A. Gardikiotis, T. Vafeiadis, J. Galán, J. A. García, E. Ferrer-Ribas, D. Fortuño, J. Ruz, T. Dafni, J. Castel, F.J. Iguaz, A. Tomás, Ioannis Giomataris, and I. G. Irastorza

Subjects
Physics, Helioscope, Particle physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, General Engineering, Astronomy and Astrophysics, MicroMegas detector, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Space and Planetary Science, 0103 physical sciences, 010306 general physics, Axion
Abstract

The T-REX project aims at developing novel readout techniques for Time Projection Chambers in experiments searching for rare events. The enhanced performance of the latest Micromegas readouts in issues like energy resolution, gain stability, homogeneity, material budget, combined with low background techniques, is opening new windows of opportunity for their application in this field. Here we review the latest results regarding the use and prospects of Micromegas readouts in axion physics (CAST and the future helioscope), as well as the R&D carried out within NEXT, to search for the neutrinoless double-beta decay., Comment: Proceedings of the 3rd International conference on Directional Detection of Dark Matter (CYGNUS 2011), Aussois, France, 8-10 June 2011

Published
2011

29. Search for solar axion emission from 7Li and D(p,gamma)3He nuclear decays with the CAST gamma-ray calorimeter

Author

CAST collaboration, S Andriamonje, S Aune, D Autiero, K Barth, A Belov, B Beltrán, H Bräuninger, J.M Carmona, S Cebrián, J.I Collar, T Dafni, M Davenport, L. Di Lella, C Eleftheriadis, J Englhauser, G Fanourakis, E Ferrer-Ribas, H Fischer, J Franz, P Friedrich, T Geralis, I Giomataris, S Gninenko, H Gómez, M Hasinoff, F.H Heinsius, D.H.H Hoffmann, I.G Irastorza, J Jacoby, K Jakovcić, D Kang, K Königsmann, R Kotthaus, M Krcmar, K Kousouris, M Kuster, B Lakić, C Lasseur, A Liolios, A Ljubicić, G Lutz, G Luzón, D.W Miller, J Morales, A Ortiz, T Papaevangelou, A Placci, G Raffelt, H Riege, A Rodríguez, J Ruz, I Savvidis, Y Semertzidis, P Serpico, L Stewart, J. D Vieira, J Villar, J Vogel, L Walckiers, K Zioutas, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Particle physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Nuclear Theory, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Solar core, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nuclear Experiment, Axion, Physics, Helioscope, Calorimeter (particle physics), 010308 nuclear & particles physics, hep-ex, High Energy Physics::Phenomenology, Gamma ray, axions, axion-photon coupling, axion-nucleon coupling, hadronic axions, Astronomy and Astrophysics, Pseudoscalar, Nucleon
Abstract

We present the results of a search for a high-energy axion emission signal from 7Li (0.478 MeV) and D(p,gamma)3He (5.5 MeV) nuclear transitions using a low-background gamma-ray calorimeter during Phase I of the CAST experiment. These so-called "hadronic axions" could provide a solution to the long-standing strong-CP problem and can be emitted from the solar core from nuclear M1 transitions. This is the first such search for high-energy pseudoscalar bosons with couplings to nucleons conducted using a helioscope approach. No excess signal above background was found., 20 pages, 8 figures, final version to be published in JCAP

Published
2010
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30. New Micromegas Detectors for Rare Event Searches: axions and decay

Author

P Gorodetzky, S. Aune, J. M. Carmona, T. Dafni, Thomas Papaevangelou, P. Salin, J. Morales, T. Geralis, A. Tomás, F.J. Iguaz, José Villar, Javier Galan, A Rodríguez, Hector Gomez, I. Giomataris, E. Ferrer-Ribas, J. Ruz, G. Luzón, S. Cebrián, I. G. Irastorza, and Georgios Fanourakis

Subjects
Nuclear physics, Physics, Particle physics, Physics::Instrumentation and Detectors, Double beta decay, Detector, MicroMegas detector, Axion, Radioactive decay
Abstract

Recently, micropattern detectors and in particular micromegas are receiving much attention from the community of rare event searches. The main features that make these detectors rather promising for this field of research and which distinguish them from other gaseous structures are their very stable operation, their homogeneity and granularity which result in very good energy and spatial resolution. In this paper we summarize the latest results on the development of new generation micromegas detectors focusing on rare event searches; more specifically their performance in the search of axions and their possible application to double beta decay experiments.

Published
2008
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31. Background studies and shielding effects for the TPC detector of the CAST experiment

Author

A. Ortiz, B. Beltrán, A Rodríguez, J. Morales, J. Ruz, J.A. Villar, J. M. Carmona, S. Cebrián, G. Luzón, I. G. Irastorza, and Haley Louise Gomez

Subjects
Physics, Time projection chamber, business.industry, Physics::Instrumentation and Detectors, Detector, Astrophysics (astro-ph), General Physics and Astronomy, FOS: Physical sciences, Astrophysics, Magnetic field, Optics, astro-ph, Electromagnetic shielding, Homogeneity (physics), business, CERN Axion Solar Telescope, Axion, Background radiation
Abstract

Sunset solar axions traversing the intense magnetic field of the CERN Axion Solar Telescope (CAST) experiment may be detected in a Time Projection Chamber (TPC) detector, as X-rays signals. These signals could be masked, however, by the inhomogeneous background of materials in the experimental site. A detailed analysis, based on the detector characteristics, the background radiation at the CAST site, simulations and experimental results, has allowed us to design a shielding which reduces the background level by a factor of ~4 compared to the detector without shielding, depending on its position, in the energy range between 1 and 10 keV. Moreover, this shielding has improved the homogeneity of background measured by the TPC., 14 pages, 5 figures, accepted in New Journal of Physics

Published
2007

32. Search for Solar Axions: CAST

Author

M. Davenport, R. Hartmann, L. Stewart, Joachim Jacoby, D. Kang, F. H. Heinsius, J. Ruz, M.L. Sarsa, Georgios Fanourakis, Jakob Englhauser, Heinrich Bräuninger, K. Königsmann, J. M. Carmona, S. Aune, J. I. Collar, C. Lasseur, I. G. Irastorza, José Villar, Dieter H. H. Hoffmann, Joaquin Vieira, S. Andriamonje, Pasquale D. Serpico, Peter Friedrich, Konstantin Zioutas, V. Arsov, G. Lutz, H. Fischer, F. T. Avignone, A. Liolios, K. Zachariadou, R. J. Creswick, Konstantinos Kousouris, M. D. Hasinoff, H. A. Farach, Thomas Papaevangelou, A. Belov, S. Cebrián, K. Barth, G. Luzón, Sergei Gninenko, Rainer Kotthaus, J. Franz, Milica Krčmar, Efrain J. Ferrer, B. Beltrán, A. Placci, L. Di Lella, Ante Ljubičić, Georg G. Raffelt, C. Eleftheriadis, T. Geralis, N. Goloubev, J. Morales, Yannis K. Semertzidis, A. Ortiz, I. Savvidis, Louis Walckiers, Markus Kuster, Biljana Lakić, E. Chesi, David Miller, I. Giomataris, T. Dafni, D. Autiero, A. Morales, and H. Riege

Subjects
Physics, Coupling constant, Particle physics, Magnet, Hadron, Axion
Published
2007
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33. The Micromegas detector of the CAST experiment

Author

P Abbon, S Andriamonje, S Aune, T Dafni, M Davenport, E Delagnes, R de Oliveira, G Fanourakis, E Ferrer Ribas, J Franz, T Geralis, A Giganon, M Gros, Y Giomataris, I G Irastorza, K Kousouris, J Morales, T Papaevangelou, J Ruz, K Zachariadou, and K Zioutas

Subjects
Physics, Helioscope, Large Hadron Collider, Physics - Instrumentation and Detectors, Detector, Other Fields of Physics, Phase (waves), FOS: Physical sciences, General Physics and Astronomy, MicroMegas detector, Instrumentation and Detectors (physics.ins-det), Nuclear physics, Electromagnetic shielding, CERN Axion Solar Telescope, Axion
Abstract

A low background Micromegas detector has been operating in the CAST experiment at CERN for the search of solar axions during the first phase of the experiment (2002-2004). The detector, made out of low radioactivity materials, operated efficiently and achieved a very low level of background rejection (5 x 10^-5 counts/keV/cm^2/s) without shielding., 13 pages, 12 figures and images, submitted to New Journal of

Published
2007

34. An improved limit on the axion-photon coupling from the CAST experiment

Author

Ioannis Giomataris, Ante Ljubičić, S. Gninenko, L. Stewart, H. Bräuninger, M. Davenport, Gerhard Lutz, Jakob Englhauser, Milica Krčmar, B. Beltrán, J.A. Villar, J. I. Collar, David Miller, L. Di Lella, A. Placci, J. M. Carmona, I. G. Irastorza, Markus Kuster, C. Lasseur, Krešimir Jakovčić, A. Ortiz, Konstantinos Kousouris, C. Eleftheriadis, S. Cebrián, E. Ferrer Ribas, A. Liolios, J. Jacoby, H. Fischer, Theodoros Geralis, D. Autiero, I. Savvidis, Yannis K. Semertzidis, Julia Vogel, M. D. Hasinoff, F.H. Heinsius, G. Luzón, T. Papaevangelou, Joaquin Vieira, Hector Gomez, J. Morales, J. Ruz, S. Andriamonje, R. Kotthaus, K. Barth, Pasquale D. Serpico, L. Walckiers, H. Riege, A Rodríguez, S. Aune, K. Königsmann, J. Franz, G. Fanourakis, T. Dafni, Dieter H. H. Hoffmann, Georg G. Raffelt, A. Belov, Peter Friedrich, Konstantin Zioutas, D. Kang, Biljana Lakić, and A. Morales

Subjects
Particle physics, Photon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010306 general physics, Axion, Physics, Coupling, Helioscope, 010308 nuclear & particles physics, Axion Dark Matter Experiment, Astrophysics (astro-ph), High Energy Physics::Phenomenology, Astronomy and Astrophysics, Stars, Globular cluster, Physics::Space Physics, Astrophysics::Earth and Planetary Astrophysics, axions, magnetic fields, CERN Axion Solar Telescope, Particle Physics - Experiment
Abstract

We have searched for solar axions or similar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup with improved conditions in all detectors. From the absence of excess X-rays when the magnet was pointing to the Sun, we set an upper limit on the axion-photon coupling of 8.8 x 10^{-11} GeV^{-1} at 95% CL for m_a, Comment: 24 pages, 8 figures, 1 table, to be submitted to JCAP; v2: minor changes in the exclusion plot; v3: minor changes to match accepted version

Published
2007

35. Prospects for the CERN Axion Solar Telescope sensitivity to 14.4 keV axions

Author

José Villar, A. Liolios, L. Di Lella, Thomas Papaevangelou, H. Riege, J. Franz, G. Fanourakis, Joachim Jacoby, Milica Krčmar, A. Morales, Ante Ljubičić, S. Andriamonje, J. M. Carmona, Pasquale D. Serpico, E. Ferrer Ribas, T. Dafni, Theodoros Geralis, L. Stewart, Y. Semertzidis, Julia Vogel, Biljana Lakić, K. Barth, G. Luzón, S. Cebrián, F. T. Avignone, B. Beltrán, Krešimir Jakovčić, A. Placci, Konstantinos Kousouris, Georg G. Raffelt, H. Fischer, A. Belov, K. Königsmann, M. D. Hasinoff, J. I. Collar, C. Lasseur, H. Bräuninger, J. Morales, David Miller, C. Eleftheriadis, Louis Walckiers, Markus Kuster, J. Ruz, Peter Friedrich, Konstantin Zioutas, S. Aune, Dieter H. H. Hoffmann, I. G. Irastorza, M. Davenport, Gerhard Lutz, Ioannis Giomataris, Joaquin Vieira, D. Kang, R. Kotthaus, F.H. Heinsius, A. Ortiz, and S. N. Gninenko

Subjects
Astrophysics and Astronomy, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, Astrophysics, 01 natural sciences, Nuclear physics, High Energy Physics::Theory, solar axions, axion-photon coupling, axion-nucleon coupling, dark matter, 0103 physical sciences, Nuclide, 010306 general physics, Nuclear Experiment, Instrumentation, Axion, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Axion Dark Matter Experiment, Astrophysics (astro-ph), High Energy Physics::Phenomenology, Excited state, Ground state, CERN Axion Solar Telescope
Abstract

The CERN Axion Solar Telescope (CAST) is searching for solar axions using the 9.0 T strong and 9.26 m long transverse magnetic field of a twin aperture LHC test magnet, where axions could be converted into X-rays via reverse Primakoff process. Here we explore the potential of CAST to search for 14.4 keV axions that could be emitted from the Sun in M1 nuclear transition between the first, thermally excited state, and the ground state of 57Fe nuclide. Calculations of the expected signals, with respect to the axion-photon coupling, axion-nucleon coupling and axion mass, are presented in comparison with the experimental sensitivity., Comment: 4 pages, 1 figure. Submitted to Nucl. Instr. and Meth. A

Published
2007

36. Background Studies for the pn-CCD Detector of CAST

Author

J. Ruz, Raimo Hartmann, G. Luzón, Hector Gomez, S. Cebrián, J. Morales, Lothar Strüder, B. Beltrán, José Villar, Markus Kuster, C. Klose, Adriane De Assis Lawisch Rodriguez, I. G. Irastorza, and Rainer Kotthaus

Subjects
Nuclear physics, Physics, Large Hadron Collider, Photon, Physics::Instrumentation and Detectors, Detector, High Energy Physics::Experiment, Cosmic ray, CERN Axion Solar Telescope, Axion, Primakoff effect, Particle identification
Abstract

The CERN Axion Solar Telescope (CAST) experiment searches for axions from the Sun converted into photons with energies up to around 10 keV via the inverse Primakoff effect in the high magnetic field of a superconducting Large Hadron Collider (LHC) prototype magnet. A backside illuminated pn‐CCD detector in conjunction with an X‐ray mirror optics is one of the three detectors used in CAST to register the expected photon signal. Since this signal is very rare a detailed study of the detector background has been undertaken with the aim to understand and further reduce the background level of the detector. The analysis is based on measured data taken during the data taking period of 2003 and 2004 of CAST and on Monte Carlo simulations of background with different origin. The background study performed for this detector show that the level of background (8.00±0.07)×10−5 counts cm−2 s−1 keV−1 between 1 and 7 keV is dominated by the external gamma background due to natural activities at the experimental site, wh...

Published
2007
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37. Search for solar axions: the CAST experiment

Author

A. Morales, M. D. Hasinoff, A. Ortiz, M. Davenport, H. Riege, F. H. Heinsius, J. M. Carmona, Thomas Papaevangelou, Georgios Fanourakis, A. Belov, Konstantinos Kousouris, Julia Vogel, Louis Walckiers, C. Eleftheriadis, Rainer Kotthaus, Sergei Gninenko, Markus Kuster, Peter Friedrich, K. Barth, G. Luzón, S. Andriamonje, Jakob Englhauser, Konstantin Zioutas, L. Stewart, J. I. Collar, T. Dafni, C. Lasseur, José Villar, S. Cebrián, I. G. Irastorza, Krešimir Jakovčić, S. Aune, A. Liolios, Joachim Jacoby, H. Fischer, Ioannis Giomataris, J. Morales, Georg G. Raffelt, J. Franz, Dieter H. H. Hoffmann, L. Di Lella, Ante Ljubičić, Milica Krčmar, T. Geralis, B. Beltrán, A. Placci, K. Königsmann, David Miller, E. Ferrer-Ribas, J. Ruz, Joaquin Vieira, G. Lutz, Biljana Lakić, Pasquale D. Serpico, D. Kang, and Heinrich Bräuninger

Subjects
Physics, Particle physics, Helioscope, Photon, Large Hadron Collider, Solar energetic particles, Physics::Instrumentation and Detectors, Dark matter, Cosmic ray, Axion, Primakoff effect
Abstract

Hypothetical axion‐like particles with a two‐photon interaction would be produced in the sun by the Primakoff process. In a laboratory magnetic field they would be transformed into X‐rays with energies of a few keV. The CAST experiment at CERN is using a decommissioned LHC magnet as an axion helioscope in order to search for these axion‐like particles. The analysis of the 2003 data showed no signal above the background, thus implying an upper limit to the axion‐photon coupling of gaγ < 1.16 × 10−10 GeV−1 at 95% CL for ma ≲ 0.02 eV. The stable operation of the experiment during 2004 data taking allowed us to lower down this parameter to a preliminary value of gaγ < 0.9 × 10−10 GeV−1.

Published
2006
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38. First results from the CERN axion solar telescope

Author

Theodoros Geralis, M. Davenport, D. Kang, A. Nikolaidis, N. Goloubev, Gerhard Lutz, K. Königsmann, K. Kousouris, Peter Friedrich, Konstantin Zioutas, Biljana Lakić, L. Di Lella, G. Luzón, F.H. Heinsius, J. Morales, M. D. Hasinoff, Jakob Englhauser, C. Eleftheriadis, Georg G. Raffelt, E. Chesi, J. I. Collar, T. Papaevangelou, J. Jacoby, S. Andriamonje, A. Ortiz, H. A. Farach, T. Dafni, D. Autiero, Markus Kuster, J. Ruz, S. Cebrián, Yannis K. Semertzidis, R. J. Creswick, K. Barth, A. Morales, F. T. Avignone, H. Bräuninger, H. Riege, B. Beltrán, Pasquale D. Serpico, David Miller, A. Placci, J. M. Carmona, A. Belov, L. Stewart, R. Kotthaus, J. Franz, G. Fanourakis, I. Savvidis, L. Walckiers, H. Fischer, C. Lasseur, Efrain J. Ferrer, Milica Krčmar, J.A. Villar, Ante Ljubičić, A. Liolios, Joaquin Vieira, I. G. Irastorza, Ioannis Giomataris, M. Mutterer, M.L. Sarsa, W. Serber, S. Aune, Dieter H. H. Hoffmann, K. Zachariadou, V. Arsov, and S. Gninenko

Subjects
Physics, Particle physics, Helioscope, PVLAS, Large Hadron Collider, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, Dark matter, Astrophysics (astro-ph), High Energy Physics::Phenomenology, General Physics and Astronomy, axions, solar telescope, LHC, FOS: Physical sciences, Astrophysics, Coupling (probability), 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, CERN Axion Solar Telescope, Axion, Primakoff effect, Particle Physics - Experiment
Abstract

Hypothetical axion-like particles with a two-photon interaction would be produced in the Sun by the Primakoff process. In a laboratory magnetic field (``axion helioscope'') they would be transformed into X-rays with energies of a few keV. Using a decommissioned LHC test magnet, CAST has been running for about 6 months during 2003. The first results from the analysis of these data are presented here. No signal above background was observed, implying an upper limit to the axion-photon coupling < 1.16 10^{-10} GeV^-1 at 95% CL for m_a, Comment: 4 pages, accepted by PRL. Final version after the referees comments

Published
2004

39. CAST—CERN Axion Solar Telescope

Author

J. Ruz

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Helioscope, Photon, Large Hadron Collider, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Massless particle, Solar core, High Energy Physics::Experiment, CERN Axion Solar Telescope, Instrumentation, Axion, Primakoff effect
Abstract

CAST (CERN Axion Solar Telescope) is a helioscope looking for axions coming from the solar core to the Earth. The experiment, located at CERN, is based on the Primakoff effect and uses a magnetic field of 9 T provided by a decommissioned LHC magnet. CAST is able to follow the Sun during sunrise and sunset and therefore three X-ray detectors are mounted on both ends of the magnet waiting for a photon from axion-to-photon conversion due to Primakoff effect. During its first phase, which concluded in 2004, CAST has been looking for axions with masses up to 0.02 eV. The second phase did already start and first data were taken in December 2005. CAST's second phase manages to reestablish the coherence needed to scan for axions with masses up to 0.83 eV by using a buffer gas. This enables the experiment to look into the theoretical regions for axions.

Published
2007
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40. Low background x-ray detection with Micromegas for axion research

Author

J. Castel, T. Vafeiadis, A Rodríguez, J. A. García, A. Gardikiotis, T. Dafni, T. Geralis, J. Galán, Haley Louise Gomez, D. Jourde, M. Davenport, G. Fanourakis, J.P. Mols, S. Aune, D.C. Herrera, L. Segui, S. C. Yildiz, T. Papaevangelou, G. Luzón, I. G. Irastorza, Ioannis Giomataris, F.J. Iguaz, A. Tomás, E. Ferrer-Ribas, J. Ruz, J. G. Garza, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR144753, and Belirlenecek

Subjects
Physics, Particle physics, Helioscope, Canfranc Underground Laboratory, Micropattern Gaseous Detectors (MSGC, GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, Ingrid, etc), Detector, Dark Matter Detectors (Wimps, Axions, etc.), X-ray detector, MicroMegas detector, Time Projection Chambers (TPC), Observatory, X-Ray Detectors, CERN Axion Solar Telescope, Instrumentation, Axion, Mathematical Physics
Abstract

Axion helioscopes aim at the detection of solar axions through their conversion into x-rays in laboratory magnetic fields. The use of low background x-ray detectors is an essential component contributing to the sensitivity of these searches. Here we review the recent advances on Micromegas detectors used in the CERN Axion Solar Telescope (CAST) and proposed for the future International Axion Observatory (IAXO). The most recent Micromegas setups in CAST have achieved background levels of 1 . 5 x 10(6) keV(-1) cm(-2) s(-1), a factor of more than 100 lower than the ones obtained by the first generation of CAST detectors. This improvement is due to the development of active and passive shielding techniques, offline discrimination techniques allowed by highly granular readout patterns, as well as the use of radiopure detector components. The status of the intensive R&D to reduce the background levels will be described, including the operation of replica detectors in test benches and the detailed Geant4 simulation of the detector setup and the detector response, which has allowed the progressive understanding of background origins. The best levels currently achieved in a test setup operating in the Canfranc Underground Laboratory (LSC) are as low as similar to 10(7) keV(-1) cm(-2) s(-1), showing the good prospects of this technology for application in the future IAXO.

Published
2014
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41. Performance of micromegas detectors in the CAST Experiment

Author

M. Davenport, I. Giomataris, A Rodríguez, F.J. Iguaz, T. Dafni, J. A. Garcia, E. Ferrer-Ribas, S. Aune, S. C. Yildiz, Hector Gomez, T. Papaevangelou, T. Geralis, Theodoros Vafeiadis, A. Gardikiotis, I. G. Irastorza, J. G. Garza, J. Ruz, A. Tomás, Javier Galan, Georgios Fanourakis, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, and Yıldız, Şükrü C.

Subjects
History, Physics::Instrumentation and Detectors, Rare Event, 01 natural sciences, X-ray Detector, Education, Nuclear physics, Optics, 0103 physical sciences, High Energy Physics, CERN Axion Solar Telescopes, 010306 general physics, Axion, Image resolution, Bosons, Physics, Time projection chamber, Expected Energy, 010308 nuclear & particles physics, business.industry, Canfranc Underground Laboratory, Detector, Detectors, MicroMegas detector, Computer Science Applications, Magnetic Fields, Spatial Resolution, High Energy Physics::Experiment, Charge-coupled device, Experiments, business, CERN Axion Solar Telescope, Micromegas
Abstract

Yıldız, Şükrü C. (Dogus Author) -- This paper was firstly submitted to 2nd International Conference on Particle Physics in Memoriam Engin Arik and Her Colleagues. CERN Axion Solar Telescope (CAST) experiment is searching for axions coming from the Sun. Inside transverse magnetic fields, axions can be converted into X-rays, which can be detected by X-ray detectors. The expected energy of the signal in CAST is in the 1-10 keV range. Low noise and low background detectors are necessary to increase the sensitivity of the experiment. Micro Mesh Gaseous Structure (micromegas) detectors have been used in CAST since the beginning, providing good energy and spatial resolution for CAST's needs. CAST has been intensely studying micromegas detectors to develop new technologies. Initially, CAST detectors consisted of a micromegas, a Time Projection Chamber (TPC) and a Charged Couple Device (CCD), however the improvements in micromegas technologies encouraged CAST to replace the TPC with 2 new micromegas detectors. In some periods during CAST run, ultra low background has been observed in one of the micromegas detectors and it is being investigated through simulations and laboratory tests carried out at Canfranc Underground Laboratory. If this low background is indeed not a systematic effect, it can open new possibilities on rare event searches.

Published
2012
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42. Towards a new generation axion helioscope

Author

Biljana Lakić, M. Davenport, H. H. J. ten Kate, Milica Krčmar, L. Walckiers, J.A. Villar, I. G. Irastorza, J. M. Carmona, K. van Bibber, Dieter H. H. Hoffmann, Ioannis Giomataris, S. Russenschuck, Alicia Rodríguez, Krešimir Jakovčić, Sergey Troitsky, G. Fanourakis, I. Shilon, Georg G. Raffelt, T. Papaevangelou, Theodoros Geralis, Julia Vogel, G. Luzón, J. A. Garcia, S. Caspi, F.J. Iguaz, Haley Louise Gomez, T. Dafni, F. T. Avignone, A. Tomás, J. Galán, Konstantin Zioutas, Javier Redondo, E. Ferrer-Ribas, A. Dudarev, J. Ruz, and Michael J. Pivovaroff

Subjects
Physics, Helioscope, Particle physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Dark matter, Hadron, FOS: Physical sciences, Astronomy and Astrophysics, Electron, Coupling (probability), 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics::Theory, dark matter experiments, axions, Orders of magnitude (time), 0103 physical sciences, 010306 general physics, CERN Axion Solar Telescope, Axion
Abstract

We study the feasibility of a new generation axion helioscope, the most ambitious and promising detector of solar axions to date. We show that large improvements in magnetic field volume, x-ray focusing optics and detector backgrounds are possible beyond those achieved in the CERN Axion Solar Telescope (CAST). For hadronic models, a sensitivity to the axion-photon coupling of $\gagamma\gtrsim {\rm few} \times 10^{-12}$ GeV$^{-1}$ is conceivable, 1--1.5 orders of magnitude beyond the CAST sensitivity. If axions also couple to electrons, the Sun produces a larger flux for the same value of the Peccei-Quinn scale, allowing one to probe a broader class of models. Except for the axion dark matter searches, this experiment will be the most sensitive axion search ever, reaching or surpassing the stringent bounds from SN1987A and possibly testing the axion interpretation of anomalous white-dwarf cooling that predicts $m_a$ of a few meV. Beyond axions, this new instrument will probe entirely unexplored ranges of parameters for a large variety of axion-like particles (ALPs) and other novel excitations at the low-energy frontier of elementary particle physics., 37 pages, 11 figures, accepted for publication in JCAP

Published
2011
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43. An ultra-low-background detector for axion searches

Author

I. Giomataris, Konstantinos Kousouris, J.P. Mols, F.J. Iguaz, J. Ruz, T. Papaevangelou, A. Tomás, E. Ferrer Ribas, I. G. Irastorza, T. Geralis, T. Dafni, Theodoros Vafeiadis, Georgios Fanourakis, S. Aune, J. Morales, and J. Galán Lacarra

Subjects
Physics, History, Large Hadron Collider, business.industry, Detector, MicroMegas detector, Computer Science Applications, Education, Background level, Nuclear physics, Optics, Electromagnetic shielding, business, Sensitivity (electronics), Axion, Energy (signal processing)
Abstract

A low background Micromegas detector has been operating in the CAST experiment at CERN for the search of solar axions since the start of data taking in 2002. The detector, made out of low radioactivity materials, operated efficiently and achieved a very low level of background (5×10-5 keV-1-cm-2-s-1) without any shielding. New manufacturing techniques (Bulk/Microbulk) have led to further improvement of the characteristics of the detector such as uniformity, stability and energy resolution. These characteristics, the implementation of passive shielding and the improvement of the analysis algorithms have dramatically reduced the background level (2×10-7 keV-1-cm-2s-1), improving thus the overall sensitivity of the experiment and opening new possibilities for future searches.

Published
2009
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44. Micromegas for Axion Search and Prospects

Author

S. Cazaux, N. Duportail, M. Riallot, T. Geralis, S. Aune, Thomas Papaevangelou, D. Besin, Javier Galan, Regina Soufli, R. M. Hill, J. Morales, B.O. Dogan, I. G. Irastorza, Georgios Fanourakis, Konstantinos Kousouris, M. J. Pivovaroff, T. Decker, M. Gros, T. Dafni, J. Ruz, Ph. Abbon, E. Ferrer Ribas, S. Andriamonje, K. van Bibber, G. Zaffanela, K. Zachariadou, A. Giganon, and I. Giomataris

Subjects
Physics, History, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Detector, MicroMegas detector, Computer Science Applications, Education, law.invention, Telescope, Nuclear physics, law, Electromagnetic shielding, Axion, Energy (signal processing), Order of magnitude
Abstract

The Micromegas technology can be used to construct very powerful detectors for low background, low energy measurements. A Micromegas X-ray detector has been used to search for solar axions in the CAST experiment at CERN. The detector has an active area of 7 cm × 7 cm, a very good x-y position, and a good energy resolution. It is built using low radioactivity materials and it is capable of low energy X-ray measurements of a few hundred eV. Despite the lack of external shielding the obtained background level is below 5 × 105 counts/keV/cm2/s. The detector is being upgraded with a reduced active area Micromegas module, a focusing X-Ray telescope and shielding, which are expected to further reduce the background by about two orders of magnitude.

Published
2007
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45. Micromegas for rare event detection

Author

M. J. Pivovaroff, T. Geralis, P Gorodetzky, Regina Soufli, K. van Bibber, S. Aune, J. Morales, I. G. Irastorza, P. Colas, T Enqvist, F.J. Iguaz, G. Luzón, I. Savvidis, T. Dafni, José Villar, Adriane De Assis Lawisch Rodriguez, E. Ferrer-Ribas, A. Tomás, Javier Galan, P. Salin, J. Ruz, I. Giomataris, Georgios Fanourakis, and Konstantinos Kousouris

Subjects
Gaseous detectors, Physics, Particle physics, Time projection chamber, WIMP, Rare event detection, MicroMegas detector, Neutrino, Axion

46. Background studies of the pn-ccd detector of cast

Author

Markus Kuster, B. Beltrán, C. Klose, José Villar, G. Luzón, Hector Gomez, I. G. Irastorza, Adriane De Assis Lawisch Rodriguez, S. Cebrián, J. Ruz, Raimo Hartmann, Rainer Kotthaus, J. Morales, and Lothar Strüder

Subjects
Nuclear physics, Physics, Large Hadron Collider, Photon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Detector, High Energy Physics::Experiment, Neutron, CERN Axion Solar Telescope, Axion, Primakoff effect
Abstract

The CERN Axion Solar Telescope (CAST) experiment searches for axions from the Sun converted into photons with energies up to around 10 keV via the inverse Primakoff effect in the high magnetic field of a superconducting Large Hadron Collider (LHC) prototype magnet. A backside illuminated pn-CCD detector in conjunction with an X-ray mirror optics is one of the three detectors used in CAST to register the expected photon signal. Since this signal is very rare a detailed study of the detector background has been undertaken with the aim to understand and further reduce the background level of the detector. The analysis is based on measured data taken during the data taking period of 2003 and 2004 of CAST and on Monte Carlo simulations of background with different origin. A background study performed for this detector show that the level of background (8.00±0.07)x10 counts cm s keV between 1 and 7 keV is dominated by the external gamma background due to natural activities at the experimental site, while radioactive impurities in the detector itself and cosmic neutrons contribute with a smaller fraction.

47. Cast - A cern experiment to search for solar axions

Author

G. Lutz, E. Arik, D. Kang, J. Vogel, Javier Galan, Spyros Tzamarias, I. G. Irastorza, Heinrich Bräuninger, Serkant Ali Cetin, A. Belov, B. Beltrán, K. Barth, G. Luzón, Dieter Hoffmann, L. Di Lella, Yannis K. Semertzidis, J. Franz, F. H. Heinsius, A. Nordt, I. Hikmet, Georgios Fanourakis, M. Davenport, Konstantinos Kousouris, Milica Krčmar, M. J. Pivovaroff, Rainer Kotthaus, Konstantin Zioutas, J. M. Carmona, S. Aune, F. S. Boydag, T. Papaevangelou, T. Geralis, G. Bourlis, J. Ruz, D. J. Miller, I. Giomataris, I. Savvidis, Krešimir Jakovčić, A. Ortiz, K. Königsmann, Adriane De Assis Lawisch Rodriguez, D. Autiero, H. Fischer, C. Eleftheriadis, Regina Soufli, J. Morales, L. Stewart, O. B. Dogan, Louis Walckiers, T. Dafni, J. I. Collar, Markus Kuster, E. Ferrer-Ribas, M. D. Hasinoff, C. Lasseur, Hector Gomez, Pasquale D. Serpico, Georg G. Raffelt, A. Placci, José Villar, K. van Bibber, Ante Ljubičić, A. Morales, S. Cebrián, Biljana Lakić, A. Liolios, H. Riege, Joachim Jacoby, Sergei Gninenko, Doğuş Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, TR3959, and Belirlenecek

Subjects
Physics, Particle physics, Large Hadron Collider, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Dark matter, Particle identification, law.invention, Telescope, High Energy Physics::Theory, Axion, law, Dark Matter, Astronomical telescopes, Solar Particles and Photons
Abstract

The CAST experiment at CERN is the only running solar axion telescope. The first results obtained so far with CAST - PHASE I is presented, which compete with the best astrophysically derived limits of the axion-to-photon coupling. The ongoing PHASE II of the experiment as well as the scheduled upgrades, which improve the axion discovery potential of CAST, are discussed. Baklan Physical Uniaon; Türk Fizik Derneği; İstanbul Üniversitesi; Yıldız Teknik Üniversitesi.

48. The International Axion Observatory (IAXO)

Author

Irastorza, I. G., Avignone, F. T., Galan, J., Garcia, J. A., Geralis, T., Giomataris, I., Gninenko, S., Gomez, H., Hoffmann, D. H. H., Iguaz, F. J., Jakovcic, K., Krcmar, M., Cantatore, G., Lakic, B., Luzon, G., Lindner, A., Pivovaroff, M., Papaevangelou, T., Raffelt, G., Redondo, J., Rodriguez, A., Russenschuck, S., Ruz, J., Caspi, S., Shilon, I., Ten Kate, H., Tomas, A., Troitsky, S., van Bibber, K., Villar, J. A., Vogel, J., Walckiers, L., Zioutas, K., IAXO Collaboration, Carmona, J. M., Dafni, T., Davenport, M., Dudarev, A., Fanourakis, G., Ferrer-Ribas, E., Lindner A., Zioutas K., I. G., Irastorza, F. T., Avignone, Cantatore, Giovanni, S., Caspi, J. M., Carmona, T., Dafni, M., Davenport, A., Dudarev, G., Fanouraki, E., Ferrer Riba, J., Galan, J. A., Garcia, T., Gerali, I., Giomatari, S., Gninenko, H., Gomez, D. H. H., Hoffmann, F. J., Iguaz, K., Jakovcic, M., Krcmar, B., Lakic, G., Luzon, A., Lindner, M., Pivovaroff, T., Papaevangelou, G., Raffelt, J., Redondo, A., Rodrıguez, S., Russenschuck, J., Ruz, I., Shilon, H., Ten Kate, A., Toma, S., Troitsky, K., van Bibber, J. A., Villar, J., Vogel, L., Walckier, and K., Zioutas

Subjects
WISPs, WISP, WIMP, Axions, Physics, FOS: Physical sciences, magnetic field, coupling [photon axion], WIMPs, dark matter, astroparticle physics, High Energy Physics - Experiment, detector [axion], High Energy Physics - Experiment (hep-ex), Axion, low [background], Particle Physics - Experiment
Abstract

The International Axion Observatory (IAXO) is a new generation axion helioscope aiming at a sensitivity to the axion-photon coupling of g(alpha gamma) >~ few x 10-12 GeV**-1}, i.e. 1 - 1.5 orders of magnitude beyond the one currently achieved by CAST. The project relies on improvements in magnetic field volume together with extensive use of x-ray focusing optics and low background detectors, innovations already successfully tested in CAST. Additional physics cases of IAXO could include the detection of electron-coupled axions invoked to explain the white dwarf cooling, relic axions, and a large variety of more generic axion-like particles (ALPs) and other novel excitations at the low-energy frontier of elementary particle physics. This contribution is a summary of our recent paper \cite{Irastorza:2011gs}., Proc. of Patras Workshop on Axions, WIMPs and WISPs, 98 - 101; DESY-PROC-2011-04; ISSN 1435-8077

Published
2012
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49. Search for low Energy solar Axions with CAST

Author

Cantatore, Giovanni, Arik, E., Aune, S., Autiero, D., Barth, K., Belov, A., Beltr��n, B., Borghi, S., Boydag, F. S., Br��uninger, H., Cantatore, G., Carmona, J. M., Cebri��n, S., Cetin, S. A., Collar, J. I., Dafni, T., Davenport, M., Di Lella, L., Dogan, O. B., Eleftheriadis, C., Elias, N., Fanourakis, G., Ferrer-Ribas, E., Fischer, H., Franz, J., Gal��n, J., Gazis, E., Geralis, T., Giomataris, I., Gninenko, S., G��mez, H., Hasinoff, M., Heinsius, F. H., Hikmet, I., Hoffmann, D. H. H., Irastorza, I. G., Jacoby, J., Jakov��i��, K., Kang, D., Karageorgopoulou, T., Karuza, M., K��nigsmann, K., Kotthaus, R., Kr��mar, M., Kousouris, K., Kuster, M., Laki��, B., Lasseur, C., Liolios, A., Ljubi��i��, A., Lozza, V., Lutz, G., Luz��n, G., Miller, D., Morales, A., {Deceased}, Morales, J., Niinikoski, T., Nordt, A., Ortiz, A., Papaevangelou, T., Pivovaroff, M., Placci, A., Raiteri, G., Raffelt, G., Riege, H., Rodr��guez, A., Ruz, J., Savvidis, I., Semertzidis, Y., Serpico, P., Solanki, S. K., Soufli, R., Stewart, L., Tsagri, M., van Bibber, K., Villar, J., Vogel, J., Walckiers, L., Zioutas, K., Lindner a., Redondo J., Ringwald A., Cantatore, Giovanni, FOR THE CAST COLLABORATION E., Arik, S., Aune, D., Autiero, K., Barth, A., Belov, B., Beltrán, S., Borghi, F. S., Boydag, H., Bräuninger, Cantatore, G., J. M., Carmona, S., Cebrián, S. A., Cetin, J. I., Collar, T., Dafni, M., Davenport, L., DI LELLA, O. B., Dogan, C., Eleftheriadi, N., Elia, G., Fanouraki, E., FERRER RIBAS, H., Fischer, J., Franz, J., Galán, E., Gazi, T., Gerali, I., Giomatari, S., Gninenko, H., Gómez, M., Hasinoff, F. H., Heinsiu, I., Hikmet, D. H. H., Hoffmann, I. G., Irastorza, J., Jacoby, K., Jakoväiä, D., Kang, T., Karageorgopoulou, M., Karuza, K., Königsmann, R., Kotthau, M., Krämar, K., Kousouri, M., Kuster, B., Lakiä, C., Lasseur, A., Liolio, A., Ljubiäiä, V., Lozza, G., Lutz, G., Luzón, D., Miller, A., Morale, Deceased, J., Morale, T., Niinikoski, A., Nordt, A., Ortiz, T., Papaevangelou, M., Pivovaroff, A., Placci, G., Raiteri, G., Raffelt, H., Riege, A., Rodríguez, J., Ruz, I., Savvidi, Y., Semertzidi, P., Serpico, S. K., Solanki, R., Soufli, L., Stewart, M., Tsagri, K., VAN BIBBER, J., Villar, J., Vogel, L., Walckier, and K., Zioutas

Subjects
WISPs, WISP, detector, Physics::Instrumentation and Detectors, Axions, Physics, FOS: Physical sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Axion, detectors, solar physics, Particle Physics - Experiment
Abstract

We have started the development of a detector system, sensitive to single photons in the eV energy range, to be suitably coupled to one of the CAST magnet ports. This system should open to CAST a window on possible detection of low energy Axion Like Particles emitted by the sun. Preliminary tests have involved a cooled photomultiplier tube coupled to the CAST magnet via a Galileian telescope and a switched 40 m long optical fiber. This system has reached the limit background level of the detector alone in ideal conditions, and two solar tracking runs have been performed with it at CAST. Such a measurement has never been done before with an axion helioscope. We will present results from these runs and briefly discuss future detector developments., Paper submitted to the proceedings of the "4th Patras Workshop on Axions, WIMPs and WISPs", DESY, Hamburg Site - Germany, 18-21 June 2008. Author affiliations are reported on the title page of the paper. In version 2: 1 affiliation change, 3 references added

Published
2009
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