GOSSIP: A vertex detector combining a thin gas layer as signal generator with a CMOS readout pixel array

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Campbell, M. and Heijne, E.H.M. and Llopart, X. and Colas, P. and Giganon, A. and Giomataris, Y. and Fornaini, A. and Graaf van der, H. and Kluit, P. and Timmermans, J. and Visschers, J.L. and Schmitz, J. (2005) GOSSIP: A vertex detector combining a thin gas layer as signal generator with a CMOS readout pixel array. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 560 (1). pp. 131-134. ISSN 0168-9002

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Abstract:A small TPC has been read out by means of a Medipix2 chip as direct anode. A Micromegas foil was placed 50 mm 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%. With this new readout technology for gas-filled
detectors we recorded many image frames containing 2D images with tracks from cosmic muons. Along these tracks, electron clusters were observed, as well as d-rays. With a gas layer thickness of only 1 mm, the device could be applied as vertex detector, outperforming all Si-based detectors.
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/62909
Official URL:http://dx.doi.org/10.1016/j.nima.2005.11.199
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