Micropattern gas detectors: The CMS MSGC project and gaseous pixel detector applications

R. Bellazzini, A. Brez, G. Gariano, L. Latronico, N. Lumb, A. Moggi, S. Reale, G. Spandre, M.M. Massai, M.A. Spezziga, A. Toropin, E. Costa, P. Soffitta, D. Pacella

Research output: Contribution to journalArticle

10 Citations (Scopus)


We report recent results from the development and testing of two types of micropattern gas detectors - micro-strip gas chambers and GEM-based devices with two types of pixel read-out. Thirty-two micro-strip gas chambers were tested in a high intensity hadron beam as a milestone for CERN's Compact Muon Solenoid (CMS) experiment. The detectors were operated with voltage settings corresponding to 98% hit detection efficiency at CMS for a total high intensity exposure period of 493 h. All of the requirements expected by the milestone - gain stability, number of lost strips, spark rate, etc. - were met, with wide margins. In a separate investigation, we have coupled PCB pixel read-out planes to GEM foils. In one case, 2mm × 2mm pixels were fanned out to individual discriminators and sealers to provide very fast (2 MHz/pixel) read-out; this system has been used as an imaging device to provide diagnostic information in fusion experiments. The second type of device used smaller pixels (200 μm squares) and a Flash-ADC read-out system to reconstruct individual photoelectron tracks. The angular distribution of the tracks allows the polarisation direction of polarised X-ray sources to be identified, with possible applications for future space experiments studying celestial X-ray emissions. © 2001 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)41 - 54
Number of pages14
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2
Publication statusPublished - 2001
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Instrumentation

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