Imaging with the invisible light

Details Imaging with the invisible light Imaging with the invisible light

2007-03-19

arxiv.org/abs/physics/0703176v2

Nucl.Instrum.Meth.A581:246-253,2007; Erratum-ibid.A585:105,2008

Physics

Instrumentation and Detectors

6 pages, 14 figures, presented at the 11th Vienna Conference on Instrumentation VIC 2007, submitted to Nuclear Instruments and

Scientific paper

10.1016/j.nima.2007.07.098 10.10

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.

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