A fast tracker for COMPASS based on the GEM

B. Ketzer, J. Ehlers, J. Friedrich, B. Grube, S. Kappler, I. Konorov, S. Paul, A. Placci, L. Ropelewski, F. Sauli

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The small area tracking system of COMPASS, a new high-luminosity fixed target experiment at CERN's SPS accelerator, comprises 20 large-size triple GEM (Gas Electron Multiplier) detectors. It was completed and fully operational for the first time for the 2002 muon run. We report on the performance of these chambers in the high-intensity beam and give first results on efficiencies as well as spatial and time resolutions measured for the full set of detectors under various beam conditions.

Original languageEnglish
Pages (from-to)368-373
Number of pages6
JournalNuclear Physics B (Proceedings Supplements)
StatePublished - Sep 2003
Externally publishedYes


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