The X-ray Telescope of CAST

Details The X-ray Telescope of CAST The X-ray Telescope of CAST

2007-02-22

arxiv.org/abs/physics/0702188v2

NewJ.Phys.9:169,2007

Physics

Instrumentation and Detectors

19 pages, 25 figures and images, replaced by the revised version accepted for publication in New Journal of Physics

Scientific paper

10.1088/1367-2630/9/6/169

The Cern Axion Solar Telescope (CAST) is in operation and taking data since 2003. The main objective of the CAST experiment is to search for a hypothetical pseudoscalar boson, the axion, which might be produced in the core of the sun. The basic physics process CAST is based on is the time inverted Primakoff effect, by which an axion can be converted into a detectable photon in an external electromagnetic field. The resulting X-ray photons are expected to be thermally distributed between 1 and 7 keV. The most sensitive detector system of CAST is a pn-CCD detector combined with a Wolter I type X-ray mirror system. With the X-ray telescope of CAST a background reduction of more than 2 orders off magnitude is achieved, such that for the first time the axion photon coupling constant g_agg can be probed beyond the best astrophysical constraints g_agg < 1 x 10^-10 GeV^-1.

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