We describe a UV photo-detector 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 105k pixels at 50 micron 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 micron rms) by the pixel chip. As a result the map of the GEM holes, arranged on a triangular pattern at 50micron pitch, is finely imaged.
Cite
@article{arxiv.physics/0703176,
title = {Imaging with the invisible light},
author = {R. Bellazzini and G. Spandre and A. Brez and M. Minuti and L. Baldini and L. Latronico and M. M. Massai and N. Omodei and M. Pesce-Rollins and C Sgró and M. Razzano and M. Pinchera and J. Bregeon and M. Kuss and A. Braem},
journal= {arXiv preprint arXiv:physics/0703176},
year = {2008}
}
Comments
6 pages, 14 figures, presented at the 11th Vienna Conference on Instrumentation VIC 2007, submitted to Nuclear Instruments and Methods A