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Title: Single-UV-photon 2-D imaging with multi-GEM detectors
Authors: Maia, J. M. 
Mörmann, D. 
Breskin, A. 
Chechik, R. 
Veloso, J. F. C. A. 
Santos, J. M. F. dos 
Keywords: Single-UV-photon imaging; Gaseous imaging detector; Gaseous photomultipliers; Gas electron multiplier
Issue Date: 2007
Citation: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 580:1 (2007) 373-376
Abstract: The main goal being the construction of large-area, low-cost position-sensitive micropattern gaseous photomultipliers (GPMs) based on gas electron multipliers (GEM) cascades, we have studied the single-photon imaging capabilities of a 4-GEM GPM with a reflective CsI-photocathode deposited on the top surface of the 1st GEM. The charge readout was performed with a simple/economic Wedge and Strip (W&S) readout electrode, using pulses induced through a resistive electrode. We have demonstrated the feasibility of single-photon imaging GPM with sub-millimeter resolution; single-photon spatial resolutions as small as ~150 [mu]m (FWHM), i.e. ~65 [mu]m (RMS), were measured in Ar/5%CH4 gas mixture at atmospheric pressure.
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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