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501. 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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502. 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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503. 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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504. Search for Sub-eV Mass Solar Axions by the CERN Axion Solar Telescope with (3)He Buffer Gas

Author

M, Arik, S, Aune, K, Barth, A, Belov, S, Borghi, H, Bräuninger, 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, P, Friedrich, J, Galán, J A, García, A, Gardikiotis, E N, Gazis, T, Geralis, I, Giomataris, 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, Kotthaus, M, Krčmar, M, Kuster, B, Lakić, J M, Laurent, A, Liolios, A, Ljubičić, V, Lozza, G, Lutz, G, Luzón, J, Morales, T, Niinikoski, A, Nordt, T, Papaevangelou, M J, Pivovaroff, G, Raffelt, T, Rashba, H, Riege, A, Rodríguez, M, Rosu, J, Ruz, I, Savvidis, P S, Silva, S K, Solanki, L, Stewart, A, Tomás, M, Tsagri, K, van Bibber, T, Vafeiadis, J A, Villar, J K, Vogel, S C, Yildiz, K, Zioutas, Arik, M., Aune, S., Barth, K., Belov, A., Borghi, S., Brauninger, H., Cantatore, Giovanni, Carmona, J. M., Cetin, S. A., Collar, J. I., Dafni, T., Davenport, M., Eleftheriadis, C., Elias, N., Ezer, C., Fanourakis, G., Ferrer Ribas, E., Friedrich, P., Galan, J., Garcia, J. A., Gardikiotis, A., Gazis, E. N., Geralis, T., Giomataris, I., Gninenko, S., Gomez, H., Gruber, E., Guthorl, T., Hartmann, R., Haug, F., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jacoby, J., Jakovcic, K., Karuza, M., Konigsmann, K., Kotthaus, R., Krcmar, M., Kuster, M., Lakic, B., Laurent, J. M., Liolios, A., Ljubicic, A., Lozza, Valentina, Lutz, G., Luzon, G., Morales, J., Niinikoski, T., Nordt, A., Papaevangelou, T., Pivovaroff, M. J., Raffelt, G., Rashba, T., Riege, H., Rodriguez, A., Rosu, M., Ruz, J., Savvidis, I., Silva, P. S., Solanki, S. K., Stewart, L., Tomas, A., Tsagri, M., van Bibber, K., Vafeiadis, T., Villar, J. A., Vogel, J. K., Yildiz, S. C., and Zioutas, K.

Subjects
solar axion, low background detectors, solar axions, photons, dark matter
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

505. Improved search for solar chameleons with a GridPix detector at CAST

Author

Wolfgang Funk, Milica Krčmar, T. Geralis, M. Maroudas, S. C. Yildiz, I. G. Irastorza, Joachim Jacoby, Sofia Kostoglou, Babette Döbrich, Sergei Gninenko, Giovanni Cantatore, C. Krieger, Søren Schmidt, M. Davenport, Marin Karuza, I. Ortega, M. J. Pivovaroff, Konstantin Zioutas, C. J. Hailey, J. Ruz, S. Neff, L. Miceli, T. Papaevangelou, S. Aune, Georg G. Raffelt, T. Dafni, I. Savvidis, M. Vretenar, Klaus Kurt Desch, Biljana Lakić, A. Liolios, Georgios Fanourakis, Nenad Kralj, Alexander Dermenev, J. F. Castel, A. Belov, Krešimir Jakovčić, L. Stewart, Dieter Hoffmann, Sami K. Solanki, Heinrich Bräuninger, Serkant Ali Cetin, E. Ruiz Chóliz, F.J. Iguaz, Vassilis Anastassopoulos, H. Fischer, A. Gardikiotis, Yannis K. Semertzidis, M. D. Hasinoff, C. Eleftheriadis, Jochen Kaminski, Anders Clemen Jakobsen, K. Paraschou, E. Ferrer-Ribas, J. M. Carmona, Julia Vogel, Theodoros Vafeiadis, J. G. Garza, K. Barth, G. Luzón, Walter Wuensch, I. Giomataris, M. Rosu, P. Brax, Ante Ljubičić, J. M. Laurent, J. A. Garcia, Evangelos Gazis, Finn Erland Christensen, 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 Théorique - UMR CNRS 3681 (IPHT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), CAST, Anastassopoulos, V., Aune, S., Barth, K., Belov, A., Bräuninger, H., Cantatore, G., Carmona, J. M., Castel, J. F., Cetin, S. A., Christensen, F., Dafni, T., Davenport, M., Dermenev, A., Desch, K., Döbrich, B., Eleftheriadis, C., Fanourakis, G., Ferrer-Ribas, E., Fischer, H., Funk, W., García, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Geralis, T., Giomataris, I., Gninenko, S., Hailey, C. J., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jakobsen, A., Jacoby, J., Jakovčić, K., Kaminski, J., Karuza, M., Kostoglou, S., Kralj, N., Krčmar, M., Krieger, C., Lakić, B., Laurent, J. M., Liolios, A., Ljubičić, A., Luzón, G., Maroudas, M., Miceli, L., Neff, S., Ortega, I., Papaevangelou, T., Paraschou, K., Pivovaroff, M. J., Raffelt, G., Rosu, M., Ruz, J., Chóliz, E. Ruiz, Savvidis, I., Schmidt, S., Semertzidis, Y. K., Solanki, S. K., Stewart, L., Vafeiadis, T., Vogel, J. K., Vretenar, M., Wuensch, W., Yildiz, S. C., Zioutas, K., and Brax, P.

Subjects
Physics - Instrumentation and Detectors, Photon, Physics::Instrumentation and Detectors, Solar luminosity, magnetic field, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), photon: coupling, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Astrophysics::Solar and Stellar Astrophysics, Detectors and Experimental Techniques, GridPix, dark energy, modified gravity, physics.ins-det, Solar physics, Physics, dark energy experiments, particle physics - cosmology connection, solar physics, Astronomy and Astrophysics, chameleon: solar, solar physic, Instrumentation and Detectors (physics.ins-det), Coupling (probability), transition: (axion photon), dark energy experiment, Beta (plasma physics), Physics::Space Physics, CAST, Astrophysics::Earth and Planetary Astrophysics, CERN Axion Solar Telescope, Particle Physics - Experiment, chameleon, Modified gravity, Particle physics, CERN Lab, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, photon: spectrum, coupling constant: upper limit, Tachocline, Astrophysics::Cosmology and Extragalactic Astrophysics, X-ray, Dark energy experiments, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Sensitivity (control systems), hep-ex, background, 010308 nuclear & particles physics, magnet, coupling: (axion 2photon), Particle physics - cosmology connection, axion: solar, tachocline, Energy (signal processing), experimental results
Abstract

We report on a new search for solar chameleons with the CERN Axion Solar Telescope (CAST). A GridPix detector was used to search for soft X-ray photons in the energy range from 200 eV to 10 keV from converted solar chameleons. No signiffcant excess over the expected background has been observed in the data taken in 2014 and 2015. We set an improved limit on the chameleon photon coupling, $\beta_\gamma < 5.7\times10^{10}$ for $1, Comment: 19 pages, 12 figures, 3 tables

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506. New Upper Limit on the Axion-Photon Coupling with an Extended CAST Run with a Xe-Based Micromegas Detector.

Author

Altenmüller K, Anastassopoulos V, Arguedas-Cuendis S, Aune S, Baier J, Barth K, Bräuninger H, Cantatore G, Caspers F, Castel JF, Çetin SA, Christensen F, Cogollos C, Dafni T, Davenport M, Decker TA, Desch K, Díez-Ibáñez D, Döbrich B, Ferrer-Ribas E, Fischer H, Funk W, Galán J, García JA, Gardikiotis A, Giomataris I, Golm J, Hailey CH, Hasinoff MD, Hoffmann DHH, Irastorza IG, Jacoby J, Jakobsen AC, Jakovčić K, Kaminski J, Karuza M, Kostoglou S, Krieger C, Lakić B, Laurent JM, Luzón G, Malbrunot C, Margalejo C, Maroudas M, Miceli L, Mirallas H, Navarro P, Obis L, Özbey A, Özbozduman K, Papaevangelou T, Pérez O, Pivovaroff MJ, Rosu M, Ruiz-Chóliz E, Ruz J, Schmidt S, Schumann M, Semertzidis YK, Solanki SK, Stewart L, Vafeiadis T, Vogel JK, and Zioutas K

Abstract

Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope has been searching for solar axions via their back conversion to x-ray photons in a 9-T 10-m long magnet directed toward the Sun. We report on an extended run with the International Axion Observatory pathfinder detector, doubling the previous exposure time. The detector was operated with a xenon-based gas mixture for part of the new run, providing technical insights for future configurations. No counts were detected in the 95% signal-encircling region during the new run, while 0.75 were expected. The new data improve the axion-photon coupling limit to 5.8×10^{-11}  GeV^{-1} at 95% CL (for m&#95;{a}≲0.02  eV), the most restrictive experimental limit to date.

Published
2024
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507. Search for solar axions by the CERN axion solar telescope with 3He buffer gas: closing the hot dark matter gap.

Author

Arik M, Aune S, Barth K, Belov A, Borghi S, Bräuninger H, Cantatore G, Carmona JM, Cetin SA, Collar JI, Da Riva E, Dafni T, Davenport M, Eleftheriadis C, Elias N, Fanourakis G, Ferrer-Ribas E, Friedrich P, Galán J, García JA, Gardikiotis A, Garza JG, Gazis EN, Geralis T, Georgiopoulou E, Giomataris I, Gninenko S, Gómez H, Gómez Marzoa M, Gruber E, Guthörl T, Hartmann R, Hauf S, Haug F, Hasinoff MD, Hoffmann DH, Iguaz FJ, Irastorza IG, Jacoby J, Jakovčić K, Karuza M, Königsmann K, Kotthaus R, Krčmar M, Kuster M, Lakić B, Lang PM, Laurent JM, Liolios A, Ljubičić A, Luzón G, Neff S, Niinikoski T, Nordt A, Papaevangelou T, Pivovaroff MJ, Raffelt G, Riege H, Rodríguez A, Rosu M, Ruz J, Savvidis I, Shilon I, Silva PS, Solanki SK, Stewart L, Tomás A, Tsagri M, van Bibber K, Vafeiadis T, Villar J, Vogel JK, Yildiz SC, and Zioutas K

Abstract

The CERN Axion Solar Telescope has finished its search for solar axions with (3)He buffer gas, covering the search range 0.64 eV ≲ ma ≲ 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 gaγ ≲ 3.3 × 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 gaγ, for example by the currently discussed next generation helioscope International AXion Observatory.

Published
2014
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508. Search for sub-eV mass solar axions by the CERN Axion Solar Telescope with 3He buffer gas.

Author

Arik M, Aune S, Barth K, Belov A, Borghi S, Bräuninger H, Cantatore G, Carmona JM, Cetin SA, Collar JI, Dafni T, Davenport M, Eleftheriadis C, Elias N, Ezer C, Fanourakis G, Ferrer-Ribas E, Friedrich P, Galán J, García JA, Gardikiotis A, Gazis EN, Geralis T, Giomataris I, Gninenko S, Gómez H, Gruber E, Guthörl T, Hartmann R, Haug F, Hasinoff MD, Hoffmann DH, Iguaz FJ, Irastorza IG, Jacoby J, Jakovčić K, Karuza M, Königsmann K, Kotthaus R, Krčmar M, Kuster M, Lakić B, Laurent JM, Liolios A, Ljubičić A, Lozza V, Lutz G, Luzón G, Morales J, Niinikoski T, Nordt A, Papaevangelou T, Pivovaroff MJ, Raffelt G, Rashba T, Riege H, Rodríguez A, Rosu M, Ruz J, Savvidis I, Silva PS, Solanki SK, Stewart L, Tomás A, Tsagri M, van Bibber K, Vafeiadis T, Villar JA, Vogel JK, Yildiz SC, and Zioutas K

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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