We describe a UV photodetector with single photon (electron) counting and imaging capability. It is based on a CsI photocathode, a GEM charge multiplier and a self-triggering CMOS analog pixel chip with 105 k pixels at 50 pm pitch. The single photoelectron produced by the absorption of a UV photon is drifted to and multiplied inside a single GEM hole. The coordinates of the GEM avalanche are reconstructed with high accuracy (4 mu m rms) by the pixel chip. As a result the map of the GEM holes, arranged on a triangular pattern at 50 pm pitch, is finely imaged. (C) 2007 Published by Elsevier B.V.
|Autori:||Bellazzini R; Spandre G; Brez A; Minuti M; Baldini L; Latronico L; Massai M; Omodei N; Pesce-Rollins M; Sgro C; Razzano M; Pinchera M; Bregeon J; Kuss M; Bream A|
|Titolo:||Imaging with the invisible light|
|Anno del prodotto:||2007|
|Digital Object Identifier (DOI):||10.1016/j.nima.2007.07.098|
|Appare nelle tipologie:||1.1 Articolo in rivista|