The detection of single electrons by means of a Micromegas-covered MediPix2 pixel CMOS readout circuit

Details The detection of single electrons by means of a Micromegas-covered MediPix2 pixel CMOS readout circuit The detection of single electrons by means of a Micromegas-covered MediPix2 pixel CMOS readout circuit

2004-09-09

arxiv.org/abs/physics/0409048v1

Nucl.Instrum.Meth.A540:295-304,2005

Physics

Instrumentation and Detectors

15 pages, 9 included postscript figures, 5 separate jpeg figures, submitted to Nucl. Instr. and Meth. A. A complete postscript

Scientific paper

10.1016/j.nima.2004.11.036

A small drift chamber was read out by means of a MediPix2 readout chip as direct anode. A Micromegas foil was placed 50 $\mu$m above the chip, and electron multiplication occurred in the gap. With a He/Isobutane 80/20 mixture, gas multiplication factors up to tens of thousands were achieved, resulting in an efficiency for detecting single electrons of better than 90% . We recorded many frames containing 2D images with tracks from cosmic muons. Along these tracks, electron clusters were observed, as well as delta-rays.

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