Published July 28, 2015
| Version v1
Journal article
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New solar axion search using the CERN Axion Solar Telescope with $^4He$ filling
Creators
- 1. Dogus University
- 2. Centre d'Études Nucléaires de Saclay
- 3. European Organization for Nuclear Research
- 4. Russian Academy of Sciences
- 5. Max-Planck-Institut für Extraterrestrische Physik
- 6. Sezione di Trieste and Università di Trieste
- 7. Universidad de Zaragoza
- 8. University of Chicago
- 9. Aristotle University of Thessaloniki
- 10. National Center for Scientific Research
Description
The CERN Axion Solar Telescope (CAST) searches for $𝑎→𝛾$ 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 $𝑚_𝛾$ to the axion search mass $𝑚_𝑎$. After the vacuum phase (2003–2004), which is optimal for $𝑚_𝑎≲0.02 eV$, we used $^4He$ in 2005–2007 to cover the mass range of 0.02–0.39 eV and $^3He$ in 2009–2011 to scan from 0.39 to 1.17 eV. After improving the detectors and shielding, we returned to 4He 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 $^4He$, to "cross the axion line" for the KSVZ model. We have improved the limit on the axion-photon coupling to $𝑔_{𝑎𝛾}<1.47×10^{−10} GeV{−1}$ (95% C.L.), depending on the pressure settings. Since 2013, we have returned to the vacuum and aim for a significant increase in sensitivity.
Notes
Due to the large number of authors, only the first 20 and the University of Chicago authors are included on the above author list. Please download the article for the complete list of authors.
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PhysRevD.92.021101.pdf
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Additional details
Identifiers
- DOI
- 10.1103/PhysRevD.92.021101
- Other
- oai:uchicago.tind.io:12532
Funding
- Natural Sciences and Engineering Research Council of Canada
- MSES
- CEA
- Bundesministerium für Forschung, Technologie und Raumfahrt
- 05 CC2EEA/9
- Bundesministerium für Forschung, Technologie und Raumfahrt
- 05 CC1RD1/0
- Deutsche Forschungsgemeinschaft
- HO 1400/7-1
- Deutsche Forschungsgemeinschaft
- EXC-153
- GSRT
- NSRF
- Spanish Ministry of Economy and Competitiveness
- FPA2008-03456
- Spanish Ministry of Economy and Competitiveness
- FPA2011-24058
- Spanish Ministry of Economy and Competitiveness
- EIC-CERN-2011-0006
- European Regional Development Fund
- European Research Council
- ERC-2009-StG-240054
- Turkish Atomic Energy Authority
- National Science Foundation
- 0239812
- NASA
- NAG5-10842
- U.S. Department of Energy
- DE-AC52-07NA27344