Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9844960 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2005 | 6 Pages |
Abstract
We report on the properties of thick GEM-like (THGEM) electron multipliers made of 0.4Â mm thick double-sided Cu-clad G-10 plates, perforated with a dense hexagonal array of 0.3Â mm diameter drilled holes. Photon detectors comprising THGEMs coupled to semi-transparent CsI photocathodes or reflective ones deposited on the THGEM surface were studied with Ar/CO2 (70:30), Ar/CH4 (95:5), CH4 and CF4. Gains of â¼105 or exceeding 106 were reached with single- or double-THGEM, respectively; the signals have 5-10Â ns rise times. The electric field configurations at the THGEM electrodes result in an efficient extraction of photoelectrons and their focusing into the holes; this occurs already at rather low gains, below 100. These detectors, with single-photon sensitivity and with expected sub-millimeter localization, can operate at MHz/mm2 rates. We discuss their prospects for large-area UV-photon imaging for RICH.
Related Topics
Physical Sciences and Engineering
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Instrumentation
Authors
R. Chechik, A. Breskin, C. Shalem,