Single-UV-photon 2-D imaging with multi-GEM detectors

• Author(s): Maia, J. M. ; Mörmann, D. ; Breskin, A. ; Chechik, R. ; Veloso, J. F. C. A. ; Santos, J. M. F. dos
• Date: 2007
• Persistent ID: http://hdl.handle.net/10316/4362
• Origin: Estudo Geral - Universidade de Coimbra
• Subject(s): Single-UV-photon imaging; Gaseous imaging detector; Gaseous photomultipliers; Gas electron multiplier
• Document Type: Article
• Language: English

Description

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. http://www.sciencedirect.com/science/article/B6TJM-4NS2G9V-M/1/b808ebe094732f4310ee7686c9118a7b