Further evaluation of a THGEM UV-photon detector for RICH - comparison with MWPC
JOURNAL OF INSTRUMENTATION, vol.5, 2010 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 5
- Publication Date: 2010
- Doi Number: 10.1088/1748-0221/5/11/p11004
- Journal Name: JOURNAL OF INSTRUMENTATION
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Keywords: Cherenkov detectors, Avalanche-induced secondary effects, Photon detectors for UV, visible and IR photons (solid-state) (PIN diodes, APDs, Si-PMTs, CCDs, EBCCDs etc), Micropattern gaseous detectors (MSGC, GEM, THGEM, RETHGEM, MICROMEGAS, InGrid, etc), GEM, LIGHT, PHOTOMULTIPLIERS, SCINTILLATION, MULTIPLIERS, XE, AR
- Open Archive Collection: AVESIS Open Access Collection
- Bursa Uludag University Affiliated: No
Abstract
The operation of single-, double- and triple-THGEM UV-detectors with reflective CsI photocathodes (CsI-THGEM) in Ne/CH4 and Ne/CF4 mixtures was investigated in view of their potential applications in RICH. The studies were carried out with UV, x-rays and beta-electrons and focused on the maximum achievable gain, discharge probability, cathode excitation effects and long-term gain stability. Comparative studies under similar conditions were made in CH4, CF4 and Ne/CF4, with a MWPC coupled to a reflective CsI photocathode (CsI-MWPC). It was found that at counting rates <= 10 Hz/mm(2) the maximum achievable gain of CsI-THGEMs is determined by the Raether limit; at counting rates > 10 Hz/mm(2) it dropped with rate. In all cases investigated the attainable CsI-THGEM gain was significantly higher than that of the CsI-MWPC, under similar conditions. Furthermore, the CsI-THGEM UV-detector suffered fewer cathode-excitation induced effects as compared to CsI-MWPC and had better stability at high counting rates.