Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716089.0, MPI für Physik / YB 2016
New solar axion search in CAST with 4-He filling
Authors:
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Physical Review D
Journal Abbrev.:Phys.Rev.D
Issue / Number:92
Start Page:021101
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:The CERN Axion Solar Telescope (CAST) searches for $a\\to\\gamma$ 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 $m_\\gamma$ to the axion search mass $m_a$. After the vacuum phase (2003--2004), which is optimal for $m_a\\lesssim0.02$ eV, we used $^4$He in 2005--2007 to cover the mass range of 0.02--0.39 eV and $^3$He in 2009--2011 to scan from 0.39--1.17 eV. After improving the detectors and shielding, we returned to $^4$He 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 $^4$He, to "cross the axion line" for the KSVZ model. We have improved the limit on the axion-photon coupling to $g_{a\\gamma}< 1.47\\times10^{-10} {\\rm GeV}^{-1}$ (95% C.L.), depending on the pressure settings. Since 2013, we have returned to vacuum and aim for a significant increase in sensitivity.
Classification / Thesaurus:CAST
Comment of the Author/Creator:CAST Collaboration 6 pages 2 figures
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:
Identifiers:
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