Abstract
A Set of new MPGD-based Photon Detectors is being built for the upgrade of COMPASS RICH-1. The detectors cover a total active area of 1.4 m2 and are based on a hybrid architecture consisting of two THGEM layers and a Micromegas. A CsI film on one THGEM acts as a reflective photocathode. The characteristics of the detector, the production of the components and their validation tests are described in detail.
Highlights
The COMPASS Experiment at CERN SPS has recently started a new set of measurements [1] imposing strict requirements in terms of rate capability, efficiency, and stability of the detector performance: several parts of the apparatus are being upgraded to meet these requirements, including the COMPASS RICH-1 detector [2], which provides π-K separation from 3 to 55 GeV/c over ±200 mrad angular acceptance, at high rates
COMPASS RICH-1 (Fig. 1, left) is a Ring Imaging Cherenkov counter with a 3 m long gaseous C4F10 radiator, a 21 m2 large focusing VUV mirror surface and Photon Detectors (PDs) covering a total active area of 5.5 m2 with two technologies: Multi-Anode PMTs coupled to individual fused silica lens telescopes in the central region (25% of the surface) and MWPCs equipped with CsIcoated photocathodes in the remaining surface
Each one of the four new chambers (Fig. 1, right) will host one of the existing 600 × 600 mm2 panel of Multi-Anode PMTs and lens telescopes together with a new MPGDbased PD consisting of two identical hybrid modules covering about 600 × 300 mm2, arranged side by side
Summary
The COMPASS Experiment at CERN SPS has recently started a new set of measurements [1] imposing strict requirements in terms of rate capability, efficiency, and stability of the detector performance: several parts of the apparatus are being upgraded to meet these requirements, including the COMPASS RICH-1 detector [2], which provides π-K separation from 3 to 55 GeV/c over ±200 mrad angular acceptance, at high rates. COMPASS RICH-1 (Fig. 1, left) is a Ring Imaging Cherenkov counter with a 3 m long gaseous C4F10 radiator, a 21 m2 large focusing VUV mirror surface and Photon Detectors (PDs) covering a total active area of 5.5 m2 with two technologies: Multi-Anode PMTs coupled to individual fused silica lens telescopes in the central region (25% of the surface) and MWPCs equipped with CsIcoated photocathodes in the remaining surface. The main technical characteristics and the production process of the MPGD-based PDs for COMPASS RICH-1 upgrade are described in this article
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