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Communication Dans Un Congrès Année : 2014

Performance of large pixelised Micromegas detectors in the COMPASS environment

Résumé

New large-size Micromegas detectors are being developed for the future physics program of the COMPASS experiment at CERN. These detectors will have a pixelised readout in their center to detect particles in the beam region, where the particle flux can reach several MHz/cm2 in nominal conditions, and will have to handle high intensity hadron beams (up to a few 107 hadrons/s) with a discharge rate lower than 0.01 to 0.001 discharge/s. Several prototypes with two different discharge rate reduction technologies (preamplification stage with a GEM foil and resistive readout with buried resistors) have been studied in the COMPASS beam since 2010. Four of them have been included in the spectrometer since 2012, and have been used for the track reconstruction. Their performance (detection efficiency, space and time resolutions, and discharge rates) for different beam intensities and magnetic fields environments are presented. These detectors play an important role in the track reconstruction at very small angle; their impact is presented, with a particular emphasis on the effect of the background reduction due to an improved cluster selection.

Dates et versions

hal-01128657 , version 1 (10-03-2015)

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Citer

F Thibaud, P Abbon, V Andrieux, M Anfreville, Y Bedfer, et al.. Performance of large pixelised Micromegas detectors in the COMPASS environment. 3rd International Conference on Micro Pattern Gaseous Detectors, Jul 2013, Zaragoza, Spain. pp.C02005, ⟨10.1088/1748-0221/9/02/C02005⟩. ⟨hal-01128657⟩
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