Physics – Instrumentation and Detectors
Scientific paper
2009-09-29
JINST 5:P01002,2010; JINST 2010:P01002,2010
Physics
Instrumentation and Detectors
13 pages, 9 figures, 1 table. Presented at MPGD09, Crete, June 2009; to be published in JINST-proceedings
Scientific paper
10.1088/1748-0221/5/01/P01002 10
The article deals with the detection efficiency of UV-photon detectors consisting of Thick Gas Electron Multipliers (THGEM) coated with CsI photocathode, operated in atmospheric Ne/CH4 and Ne/CF4 mixtures. We report on the photoelectron extraction efficiency from the photocathode into these gas mixtures, and on the photoelectron collection efficiency into the THGEM holes. Full collection efficiency was reached in all gases investigated, in some cases at relatively low multiplication. High total detector gains for UV photons, in excess of 10^5, were reached at relatively low operation voltages with a single THGEM element. We discuss the photon detection efficiency in the context of possible application to RICH.
Azevedo C. D. R.
Breskin Amos
Chechik Rachel
Cortesi Marco
dos Santos Joaquim M. F.
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