dorsal/arxiv
View SchemaThick GEM-like multipliers - a simple solution for large area UV-RICH detectors
| Authors | R. Chechik, A. Breskin, C. Shalem |
|---|---|
| Categories | |
| ArXiv ID | physics/0502131 |
| URL | https://arxiv.org/abs/physics/0502131 |
| DOI | 10.1016/j.nima.2005.08.003 |
| Journal | Nucl.Instrum.Meth.A553:35-40,2005 |
Abstract
We report on the properties of thick GEM-like (THGEM) electron multipliers made of 0.4 mm thick double-sided Cu-clad G-10 plates, perforated with a dense hexagonal array of 0.3 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 ~100000 or exceeding 1000000 were reached with single- or double-THGEM, respectively; the signals have 5-10 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.
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"abstract": "We report on the properties of thick GEM-like (THGEM) electron multipliers\nmade of 0.4 mm thick double-sided Cu-clad G-10 plates, perforated with a dense\nhexagonal array of 0.3 mm diameter drilled holes. Photon detectors comprising\nTHGEMs coupled to semi-transparent CsI photocathodes or reflective ones\ndeposited on the THGEM surface were studied with Ar/CO2 (70:30), Ar/CH4 (95:5),\nCH4 and CF4. Gains of ~100000 or exceeding 1000000 were reached with single- or\ndouble-THGEM, respectively; the signals have 5-10 ns rise times. The electric\nfield configurations at the THGEM electrodes result in an efficient extraction\nof photoelectrons and their focusing into the holes; this occurs already at\nrather low gains, below 100. These detectors, with single-photon sensitivity\nand with expected sub-millimeter localization, can operate at MHz/mm2 rates. We\ndiscuss their prospects for large-area UV-photon imaging for RICH.",
"arxiv_id": "physics/0502131",
"authors": [
"R. Chechik",
"A. Breskin",
"C. Shalem"
],
"categories": [
"physics.ins-det"
],
"doi": "10.1016/j.nima.2005.08.003",
"journal_ref": "Nucl.Instrum.Meth.A553:35-40,2005",
"title": "Thick GEM-like multipliers - a simple solution for large area UV-RICH detectors",
"url": "https://arxiv.org/abs/physics/0502131"
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