New gaseous detectors: the application of CMOS pixel chips as direct anode


Campbell, M. and Heijne, E.H.M. and Llopart, X. and Chefdeville, M.A. and Colas, P. and Giganon, A. and Giomataris, Y. and Colijn, A.P. and Fornaini, A. and Graaf, H. van der and Kluit, P. and Timmermans, J. and Visschers, J.L. and Schmitz, J. (2004) New gaseous detectors: the application of CMOS pixel chips as direct anode. In: 2004 IEEE Nuclear Science Symposium Conference Record, 16-22 Oct 2004, Rome, Italy (pp. pp. 955-958).

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Abstract:A small Time Projection Chamber (TPC) has been read out by means of a Medipix2 readout chip as direct anode. A Micromegas foil was placed 50 μm 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 δ-rays. Some applications of this new device are presented.
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Copyright:© 2004 IEEE
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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