Physics – Medical Physics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apsp.conf..200g&link_type=abstract
ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS. Proceedings of the 11th Conference. Held
Physics
Medical Physics
Cast, Axion, Primakoff, Helioscope, Sun
Scientific paper
Our experiment is searching for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously have reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here we report results from CAST where the magnet bores were filled with 4He gas (Phase II) of variable pressure. The introduction of gas generates a refractive photon mass mγ, thereby achieving the maximum possible conversion rate for those axion masses ma that match mγ. We have scanned masses up to about 0.4 eV, taking approximately 2 h of data for each setting. We set a typical upper limit on the axion-photon coupling of gaγ < 2.2·10-10GeV-1 at 95% CL for ma < 0.4 eV. Currently in the second part of CAST Phase II, we are searching for axions with masses up to about 1.2 eV using 3He as a buffer gas. This paper will also present the status of CAST's second phase; 3He upgrades and other system's improvements, results of the last data taking periods and future prospects for extension of CAST towards a more sensitive experiment.
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