Title :
New gaseous detectors: the application of CMOS pixel chips as direct anode
Author :
Campbell, M. ; Heijne, E.H.M. ; Llopart, X. ; Chefdeville, M. ; Colas, P. ; Giganon, A. ; Giomataris, Y. ; Colijn, A.P. ; Fornaini, A. ; van der Graaf, H. ; Kluit, P. ; Timmermans, J. ; Visschers, J.L. ; Schmitz, J.
Author_Institution :
MediPix Consortium, CERN, Geneva, Switzerland
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.
Keywords :
CMOS integrated circuits; cosmic ray apparatus; cosmic ray muons; electron detection; electron multiplier detectors; muon detection; nuclear electronics; particle tracks; readout electronics; semiconductor counters; time projection chambers; 2D images; CMOS pixel chips; He-isobutane mixture; Medipix2 readout chip; Micromegas foil; cosmic muon tracks; delta-rays; direct anode; electron clusters; electron multiplication; gas multiplication factors; gaseous detectors; single electron detection efficiency; time projection chamber; Aluminum; Anodes; Charge carrier processes; Detectors; Electrons; Iron; Pixel; Testing; Wafer bonding; X-ray imaging;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2004 IEEE
Print_ISBN :
0-7803-8700-7
Electronic_ISBN :
1082-3654
DOI :
10.1109/NSSMIC.2004.1462365
