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Proceedings Paper

The x-ray mirror telescope and the pn-CCD detector of CAST
Author(s): Markus Kuster; Heinrich Braeuninger; Jakob Englhauser; Peter Friedrich; Robert Hartmann; Rainer Kotthaus; Gerhard Lutz; W. Serber; Lothar Strueder; Donghwa Kang; Juergen Franz; J. Moralez
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Paper Abstract

The Cern Axion Solar Telescope - CAST - uses a prototype 9 Tesla LHC superconducting dipole magnet to search for a hypothetical pseudoscalar particle, the axion, which was proposed by theory in the 1980s to solve the strong CP problem and which could be a dark matter candidate. In CAST a strong magnetic field is used to convert the solar axions to detectable photons via inverse Primakoff effect. The resulting X-rays are thermally distributed in the energy range of 1-7 keV and can be observed with conventional X-ray detectors. The most sensitive detector system of CAST is a pn-CCD detector originally developed for XMM-Newton combined with a Wolter I type X-ray mirror system. The combination of a focusing X-ray optics and a state of the art pn-CCD detector which combines high quantum efficiency, good spacial and energy resolution, and low background improves the sensitivity of the CAST experiment such that for the first time the axion photon coupling constant can be probed beyond the best astrophysical constraints. In this paper we report on the performance and status of the X-ray telescope and pn-CCD detector of CAST.

Paper Details

Date Published: 29 September 2004
PDF: 8 pages
Proc. SPIE 5500, Gravitational Wave and Particle Astrophysics Detectors, (29 September 2004); doi: 10.1117/12.551652
Show Author Affiliations
Markus Kuster, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Heinrich Braeuninger, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Jakob Englhauser, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Peter Friedrich, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Robert Hartmann, PNSensor GmbH (Germany)
Rainer Kotthaus, Max-Planck-Institut fur Physik (Germany)
Gerhard Lutz, Max-Planck-Institut fur Physik (Germany)
W. Serber, Max-Planck-Institut fur Physik (Germany)
Lothar Strueder, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Donghwa Kang, Albert-Ludwigs-Univ. Freiburg (Germany)
Juergen Franz, Albert-Ludwigs-Univ. Freiburg (Germany)
J. Moralez, Univ. de Zaragoza (Spain)

Published in SPIE Proceedings Vol. 5500:
Gravitational Wave and Particle Astrophysics Detectors
James Hough; Gary H. Sanders, Editor(s)

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