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Title: CAST - A CERN Experiment to Search for Solar Axions

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.

Authors:
; ; ; ;  [1]; ; ; ;  [2]; ; ; ; ; ; ; ; ; ;  [3];  [4]
  1. Dogus University, Istanbul (Turkey)
  2. DAPNIA, Centre d'Etudes Nucleaires de Saclay (CEA-Saclay), Gif-sur-Yvette (France)
  3. European Organization for Nuclear Research (CERN), Geneve (Switzerland)
  4. Institute for Nuclear Research (INR), Russian Academy of Sciences, Moscow (Russian Federation) (and others)
Publication Date:
OSTI Identifier:
21057167
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 899; Journal Issue: 1; Conference: 6. international conference of the Balkan Physical Union, Istanbul (Turkey), 22-26 Aug 2006; Other Information: DOI: 10.1063/1.2733037; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA). CAST Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AXIONS; CERN; COUPLING; NONLUMINOUS MATTER; PARTICLE IDENTIFICATION; PHOTONS; TELESCOPE COUNTERS

Citation Formats

Arik, E., Boydag, F. S., Cetin, S. A., Dogan, O. B., Hikmet, I., Aune, S., Dafni, T., Ferrer-Ribas, E., Giomataris, I., Autiero, D., Barth, K., Davenport, M., Di Lella, L., Lasseur, C., Papaevangelou, T., Placci, A., Riege, H., Stewart, L., Walckiers, L., and Belov, A.. CAST - A CERN Experiment to Search for Solar Axions. United States: N. p., 2007. Web. doi:10.1063/1.2733037.
Arik, E., Boydag, F. S., Cetin, S. A., Dogan, O. B., Hikmet, I., Aune, S., Dafni, T., Ferrer-Ribas, E., Giomataris, I., Autiero, D., Barth, K., Davenport, M., Di Lella, L., Lasseur, C., Papaevangelou, T., Placci, A., Riege, H., Stewart, L., Walckiers, L., & Belov, A.. CAST - A CERN Experiment to Search for Solar Axions. United States. doi:10.1063/1.2733037.
Arik, E., Boydag, F. S., Cetin, S. A., Dogan, O. B., Hikmet, I., Aune, S., Dafni, T., Ferrer-Ribas, E., Giomataris, I., Autiero, D., Barth, K., Davenport, M., Di Lella, L., Lasseur, C., Papaevangelou, T., Placci, A., Riege, H., Stewart, L., Walckiers, L., and Belov, A.. Mon . "CAST - A CERN Experiment to Search for Solar Axions". United States. doi:10.1063/1.2733037.
@article{osti_21057167,
title = {CAST - A CERN Experiment to Search for Solar Axions},
author = {Arik, E. and Boydag, F. S. and Cetin, S. A. and Dogan, O. B. and Hikmet, I. and Aune, S. and Dafni, T. and Ferrer-Ribas, E. and Giomataris, I. and Autiero, D. and Barth, K. and Davenport, M. and Di Lella, L. and Lasseur, C. and Papaevangelou, T. and Placci, A. and Riege, H. and Stewart, L. and Walckiers, L. and Belov, A.},
abstractNote = {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.},
doi = {10.1063/1.2733037},
journal = {AIP Conference Proceedings},
number = 1,
volume = 899,
place = {United States},
year = {Mon Apr 23 00:00:00 EDT 2007},
month = {Mon Apr 23 00:00:00 EDT 2007}
}
  • thetical 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 ga{gamma} < 1.16 x 10-10 GeV-1 at 95% CL for ma < or approx. 0.02 eV. The stable operation of themore » experiment during 2004 data taking allowed us to lower down this parameter to a preliminary value of ga{gamma} < 0.9 x 10-10 GeV-1.« less
  • The CERN Axion Solar Telescope (CAST) experiment uses a decommissioned LHC test magnet in conjunction with three different technology X-ray photon detectors and tracks the sun to look for the elusive axion. Axions or axion-like particles with a two-photon interaction can be produced in the Sun by the Primakoff process, according to the theory. In a laboratory magnetic field they can be transformed into X-rays with energies of a few keV. CAST has been running for about 6 months during 2003 and most of 2004. The first results from the analysis of the 2003 data are presented here. No signalmore » above background was observed, implying an upper limit to the axion to photon coupling g{alpha}{gamma}{gamma} < 1.16 x 10-10 GeV-1 at 95% CL for m{alpha} {<=} 0.02 eV. This limit is comparable to the limit from stellar energy loss arguments and considerably more restrictive than any previous experiment in this axion mass range.« less
  • The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using {sup 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 {sup 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 < or approx. m{sub a} < or approx. 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 themore » axion-photon coupling of g{sub a}{gamma} < or approx. 2.3x10{sup -10} GeV{sup -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{sub a} < or approx. 1.15 eV, comfortably overlapping with cosmological hot dark matter bounds.« less
  • We have searched for 14.4 keV solar axions or more general axion-like particles (ALPs), that may be emitted in the M1 nuclear transition of 57Fe, by using the axion-to-photon conversion in the CERN Axion Solar Telescope (CAST) with evacuated magnet bores (Phase I). From the absence of excess of the monoenergetic X-rays when the magnet was pointing to the Sun, we set model-independent constraints on the coupling constants of pseudoscalar particles that couple to two photons and to a nucleon g{sub ay}|-1.19g{sub aN}{sup 0}+g{sub aN}{sup 3}| < 1.36 x 10{sup -16} GeV{sup -1} for ma < 0.03 eV at themore » 95% confidence level.« less