Physics – Instrumentation and Detectors
Scientific paper
2003-08-31
Nucl.Instrum.Meth. A523 (2004) 345-354
Physics
Instrumentation and Detectors
14 pages, 11 figures, Submitted to NIM A
Scientific paper
10.1016/j.nima.2003.12.018
Results obtained with a triple GEM detector operated in pure CF4 with and without a reflective CsI photocathode are presented. The detector operates in a stable mode at gains up to 10^4. A deviation from exponential growth starts to develop when the total charge exceeds ~ 4 10^6 e leading to gain saturation when the total charge is ~ 2 10^7 e and making the structure relatively robust against discharges. No aging effects are observed in the GEM foils after a total accumulated charge of ~ 10 mC/cm^2 at the anode. The ion back-flow current to the reflective photocathode is comparable to the electron current to the anode. However, no significant degradation of the CsI photocathode is observed for a total ion back-flow charge of ~ 7 mC/cm^2.
Fraenkel Z.
Inuzuka Masahide
Kozlov Alexander
Ravinovich I.
Shekhtman L.
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