The detection of single electrons by means of a Micromegas-covered Medipix2 pixel CMOS readout circuit

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Campbell, M. and Chefdeville, M. and Colas, P. and Colijn, A.P. and Forniani, A. and Giomataris, Y. and Graaf van der, H. and Heijne, E.H.M. and Kluit, P. and Llopart, X. and Schmitz, J. and Timmermans, J. and Visschers, J.K. (2005) The detection of single electrons by means of a Micromegas-covered Medipix2 pixel CMOS readout circuit. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 540 (2-3). pp. 295-304. ISSN 0168-9002

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Abstract:A small drift chamber was read out by means of a MediPix2 readout chip as a direct anode. A Micromegas foil was placed 50micrometer 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 ?-rays.
Item Type:Article
Copyright:© 2005 Elsevier
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/67702
Official URL:http://dx.doi.org/10.1016/j.nima.2004.11.036
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