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

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 < 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.
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Publication Date:
Report Number(s):
LLNL-JRNL-675539
Journal ID: ISSN 1550-7998; PRVDAQ
Grant/Contract Number:
AC52-07NA27344
Type:
Published Article
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 92; Journal Issue: 2; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
CAST Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1204686
Alternate Identifier(s):
OSTI ID: 1236138