Performance of the Micromegas detector in the CAST experiment

Details Performance of the Micromegas detector in the CAST experiment Performance of the Micromegas detector in the CAST experiment

2005-12-12

arxiv.org/abs/physics/0512094v1

Nucl.Instrum.Meth.A573:38-40,2007

Physics

Instrumentation and Detectors

Prepared for PSD7: The Seventh International Conference on Position Sensitive Detectors, Liverpool, United Kingdom, 12-16 Sep.

Scientific paper

10.1016/j.nima.2006.10.249

The gaseous Micromegas detector designed for the CERN Axion search experiment CAST, operated smoothly during Phase-I, which included the 2003 and 2004 running periods. It exhibited linear response in the energy range of interest (1-10keV), good spatial sensitivity and energy resolution (15-19% FWHM at 5.9keV)as well as remarkable stability. The detector's upgrade for the 2004 run, supported by the development of advanced offline analysis tools, improved the background rejection capability, leading to an average rate 5x10^-5 counts/sec/cm^2/keV with 94% cut efficiency. Also, the origin of the detected background was studied with a Monte Carlo simulation, using the GEANT4 package.

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