2002/08/05 by A. Bondar, A. Buzulutskov, L. Shekhtman +2 · 1 citation
Engineering · Physics and Astronomy · #CCD and CMOS Imaging Sensors #Particle Detector Development and Performance #Radiation Detection and Scintillator Technologies #physics.ins-det
paper · pdf · doi:10.1016/s0168-9002(02)01763-1
published as Nucl.Instrum.Meth. A496 (2003) 325-332 · 9 pages, 11 figures. Submitted to Nucl. Instr. and Meth. A
arxiv created 2002/08/05 · openalex publication_date 2002/12/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 104. 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.