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

摘要

New Micromegas (Micro-mesh gaseous) detectors are being developed in view of the future physics projects planned by the COMPASS collaboration at CERN. The two objectives for the future detectors are to make active their central area which sees the beam, and to make them stand hadron beam flux five time higher than the present detectors. These objectives require different changes in the detector structures: pixelized area in the center, reduction of the discharges rate, integrated electronics and improved robustness. We report here studies done in COMPASS environment with simplified pixelized prototypes in 2009 and with close to final design detectors in 2010. We also show results from beam tests with small prototypes using different solutions to reduce the discharges rate: adding a GEM foil, and using resistive boards.