A triple-GEM detector with pixel readout for high-rate beam tracking in COMPASS

B. Ketzer, A. Austregesilo, F. Haas, I. Konorov, M. Krämer, A. Mann, T. Nagel, S. Paul

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Scopus citations

Abstract

For its physics program with a high-intensity hadron beam of 2 · 107 particles/s, the COMPASS experiment at CERN requires tracking of charged particles scattered by very small angles with respect to the incident beam direction. While good resolution in time and space is mandatory, the challenge is imposed by the high beam intensity, requiring radiation-hard detectors which add very little material to the beam path in order to minimise secondary interactions. To this end, a set of triple-GEM detectors with pixel readout in the beam region and 2-D strip readout in the periphery is currently being built. The readout structure has been realised on a polyimide printed circuit foil of only 100 μm total thickness with three conductive layers. The pixel size has been chosen to be 1×1 mm2, which constitutes a compromise between the spatial resolution achievable and the number of readout channels. A 2-D strip readout structure with a pitch of 400 μm surrounds the pixel area. In total an active area of 10 × 10 cm2 is covered using 2048 readout channels. Analogue readout by the APV25 ASIC has been chosen in order to profit from amplitude measurements which help to improve the spatial resolution by clustering neighbouring hit strips or pixels. A detector prototype has been tested successfully in the 5 · 107 particles/s COMPASS muon beam, as well as in a focused hadron beam. The design of the detector and first results concerning its performance as a beam tracker will be presented.

Original languageEnglish
Title of host publication2007 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS-MIC
Pages242-244
Number of pages3
DOIs
StatePublished - 2007
Externally publishedYes
Event2007 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS-MIC - Honolulu, HI, United States
Duration: 27 Oct 20073 Nov 2007

Publication series

NameIEEE Nuclear Science Symposium Conference Record
Volume1
ISSN (Print)1095-7863

Conference

Conference2007 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS-MIC
Country/TerritoryUnited States
CityHonolulu, HI
Period27/10/073/11/07

Keywords

  • APV25
  • COMPASS
  • GEM
  • High-rate tracking
  • Micropattern gas detector
  • Pixel readout

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