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Communication Dans Un Congrès Année : 2012

New pixelized Micromegas detector with low discharge rate for the COMPASS experiment

Résumé

New Micromegas (Micro-mesh gaseous detectors) are being developed in view of the future physics projects planned by the COMPASS collaboration at CERN. Several major upgrades compared to present detectors are being studied: detectors standing five times higher luminosity with hadron beams, detection of beam particles (flux up to a few hundred of kHz/mm2, 10 times larger than for the present Micromegas detectors) with pixelized read-out in the central part, light and integrated electronics, and improved robustness. Two solutions for a reduction of the impact of discharges have been studied, with Micromegas detectors using resistive layers and using an additional GEM foil. The performance of such detectors has been measured during beam test periods. A large size prototype with nominal active area and pixelized read-out has been produced and installed in the COMPASS spectrometer in 2010. In 2011 prototypes featuring an additional GEM foil, as well as a resistive prototype, were tested in similar conditions and preliminary results from those detectors are very promising. We present here the project and report on its status, in particular the performance of large size prototypes with an additional GEM foil.

Dates et versions

hal-01133011 , version 1 (18-03-2015)

Identifiants

Citer

D Neyret, P Abbon, M Anfreville, Y Bedfer, E Burtin, et al.. New pixelized Micromegas detector with low discharge rate for the COMPASS experiment. 2nd International Conference on Micro Pattern Gaseous Detectors (MPGD2011), Aug 2011, Kobe, Japan. pp.C03006, ⟨10.1088/1748-0221/7/03/C03006⟩. ⟨hal-01133011⟩
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