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Performance of the micromegas detector in the CAST experiment

✍ Scribed by S. Aune; T. Dafni; G. Fanourakis; E. Ferrer Ribas; T. Geralis; A. Giganon; Y. Giomataris; I.G. Irastorza; K. Kousouris; K. Zachariadou

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
201 KB
Volume
573
Category
Article
ISSN
0168-9002

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✦ Synopsis

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 (1-10 keV), good spatial sensitivity and energy resolution (15-19% FWHM at 5.9 keV) 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 5 Γ‚ 10 Γ€5 counts/s/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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