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Title: New solar axion search using the CERN Axion Solar Telescope with He 4 filling

Journal Article · · Physical Review. D, Particles, Fields, Gravitation and Cosmology

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 mγ to the axion search mass ma. After the vacuum phase (2003–2004), which is optimal for ma ≲ 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 ma 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 < 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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
CAST Collaboration
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1204686
Alternate ID(s):
OSTI ID: 1236138
Report Number(s):
LLNL-JRNL-675539; PRVDAQ; 021101
Journal Information:
Physical Review. D, Particles, Fields, Gravitation and Cosmology, Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology Vol. 92 Journal Issue: 2; ISSN 1550-7998
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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