Search for solar axions with the CAST-experiment
KünyeVogel, J., Arık, E., Aune, S., Autiero, D., Barth, K., Belov, A. ... CAST Collaboration. (2008). Search for solar axions with the CAST-experiment. In M. Barone, A. Gaddi, C. Leroy, L. Price, P. G. Rancoita & R. Ruchti (Eds.), Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications - Proceedings of the 10th Conference (pp. 282-286). Singapore, SG: World Scientific.
Solar axions can be produced in the Sun via the so-called Primakoff effect. The CERN Axion Solar Telescope (CAST) uses an LHC prototype magnet of about 9 T to reconvert these axions into photons. The magnet is able to follow the Sun for about 3 hours per day. Three different X-Ray detectors are mounted on its ends to detect photons from axionto- photon conversion: a Time Projection Chamber (TPC), a MICROMEGAS (MICROMEsh GAseous Structure) and a Charge Coupled Device (CCD). For the CCD an X-ray focusing device is used to improve the signal-to-background ratio significantly. With the completion of CAST's first phase, the current limits on the coupling constant gar for axion masses up to 0.02 eV have been improved. In its second phase, CAST extends the axion mass range by filling the magnet with a buffer gas. Masses up to about 0.4 eV have already been covered and thus the experiment is entering the regions favored by axion models. This paper will present the status of CAST's second phase.