Investigation of the performance of an optimised MicroCAT, a GEM and their combination by simulations and current measurements

Abstract

A MicroCAT (Micro Compteur A Trous) structure which is used for avalanche charge multiplication in gas filled radiation detectors has been optimised with respect to maximum electron transparency and minimum ion feedback. We report on the charge transfer behaviour and the achievable gas gain of this device. A three-dimensional electron and ion transfer simulation is compared to results derived from electric current measurements. Similarly, we present studies of the charge transfer behaviour of a GEM (Gas Electron Multiplier) by current measurements and simulations. Finally, we investigate the combination of the MicroCAT and the GEM by measurements with respect to the performance at different voltage settings, gas mixtures and gas pressures.

26 pages, 32 figures

References in corpus (2)

• Studies of aging and HV break down problems during development and operation of MSGC and GEM detectors for the Inner Tracking System of HERA-B
• Properties of Groove Chambers

Cited by in corpus (4)

• Long-term stability test of a triple GEM detector
• Gas gain and signal length measurements with a triple-GEM at different pressures of Ar-, Kr- and Xe-based gas mixtures
• On image reconstruction with the two-dimensional interpolating resistive readout structure of the Virtual-Pixel detector
• GEM applications outside high energy physics