Multi-GEM detectors in high particle fluxes

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Gaseous Electron Multipliers (GEM) are well known for stable operation at high particle fluxes. We present a study of the intrinsic limits of GEM detectors when exposed to veiy high particle fluxes of the order of MHz/mm2. We give an interpretation to the variations of the effective gain, which, as a function of the particle flux, first increases and then decreases. Wre also discuss the reduction of the ion back-flow with increasing flux. We present measurements and simulations of a triple GEM detector, describing its behaviour in terms of accumulation of positive ions that results in changes of the transfer fields and the amplification fields. The behaviour is expected to be common to all multi-stage amplification devices where the efficiency of transferring the electrons from one stage to the next one is not 100%.


  • P. Thuiner
  • F. Resnati
  • S. Franchino
  • D. Gonzalez Diaz
  • R. Hall-Wilton
  • H. Muller
  • E. Oliveri
  • D. Pfeiffer
  • L. Ropelewski
  • M. Van Stenis
  • C. Streli
  • R. Veenhof
Externa organisationer
  • CERN
  • Vienna University of Technology
  • Uludağ University

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Acceleratorfysik och instrumentering
TidskriftEPJ Web of Conferences
StatusPublished - 2018 feb 21
Peer review utfördJa