Study of ion feedback in multi-GEM structures

A. Bondar; A. Buzulutskov; L. Shekhtman; A. Vasiljev

doi:10.1016/S0168-9002(02)01763-1

Study of ion feedback in multi-GEM structures

Instrumentation and Detectors 2009-11-07 v1

Authors: A. Bondar , A. Buzulutskov , L. Shekhtman , A. Vasiljev

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Abstract

We study the feedback of positive ions in triple and quadruple Gas Electron Multiplier (GEM) detectors. The effects of GEM hole diameter, detector gain, applied voltages, number of GEMs and other parameters on ion feedback are investigated in detail. In particular, it was found that the ion feedback is independent of the gas mixture and the pressure. In the optimized multi-GEM structure, the ion feedback current can be suppressed down to 0.5% of the anode current, at a drift field of 0.1 kV/cm and gain of 10^4. A simple model of ion feedback in multi-GEM structures is suggested. The results obtained are relevant to the performance of time projection chambers and gas photomultipliers.

Keywords

gaseous detectors

Cite

@article{arxiv.physics/0208017,
  title  = {Study of ion feedback in multi-GEM structures},
  author = {A. Bondar and A. Buzulutskov and L. Shekhtman and A. Vasiljev},
  journal= {arXiv preprint arXiv:physics/0208017},
  year   = {2009}
}

Comments

9 pages, 11 figures. Submitted to Nucl. Instr. and Meth. A

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