Study of ion feedback in multi-GEM structures

Details Study of ion feedback in multi-GEM structures Study of ion feedback in multi-GEM structures

2002-08-05

arxiv.org/abs/physics/0208017v1

Nucl.Instrum.Meth. A496 (2003) 325-332

Physics

Instrumentation and Detectors

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

Scientific paper

10.1016/S0168-9002(02)01763-1

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.

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