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.
@article{arxiv.0909.5357,
title = {Towards THGEM UV-photon detectors for RICH: on single-photon detection efficiency in Ne/CH4 and Ne/CF4},
author = {C. D. R. Azevedo and M. Cortesi and A. V. Lyashenko and A. Breskin and R. Chechik and J. Miyamoto and V. Peskov and J. Escada and J. F. C. A. Veloso and J. M. F. dos Santos},
journal= {arXiv preprint arXiv:0909.5357},
year = {2014}
}
Comments
13 pages, 9 figures, 1 table. Presented at MPGD09, Crete, June 2009; to be published in JINST-proceedings