Blocking positive ion backflow using a GEM gate: Experiment and simulations

P. Gros, K. Fujii, T. Fusayasu, Y. Kato, S. Kawada, M. Kobayashi, T. Matsuda, O. Nitoh, A. Sugiyama, T. Takahashi, J. Tian, T. Watanabe, R. Yonamine

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Positive ion feedback can be problematic in a high precision Time Projection Chamber (TPC) as proposed for the International Linear Collider (ILC). Use of a traditional wire gating device would increase the dead areas in the planned module structure. F. Sauli proposed, in 2006, the use of a Gas Electron Multiplier (GEM) as a gating device. We have measured the electron transparency for a 14 μm thick GEM in a 1 T magnetic field. The transparency does not meet the requirement for a TPC at the ILC. We performed a simulation study using Garfield++ to understand the important parameters. Simulations show that a new GEM structure with wider aperture, for example a hexagonal honeycomb structure, can improve the performance as a gate. Results of measurements will be compared to the simulation and the predicted performance of the new GEM structure will be described.

Original languageEnglish
Article numberC11023
JournalJournal of Instrumentation
Issue number11
Publication statusPublished - 2013 Nov
Externally publishedYes


  • Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc)
  • Micropattern gaseous detectors (MSGC, GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, InGrid, etc)
  • Time projection Chambers (TPC)

ASJC Scopus subject areas

  • Mathematical Physics
  • Instrumentation


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