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Photon detectors

The technique proposed for the Photon detectors is MWPC's with pad cathodes covered with a CsI film, as developed by RD26. Being a member of the RD26 Collaboration [22], Trieste has already started in 1995 some prototype work and has taken up the responsibility for both the photon chambers and the read-out electronics for both RICH1 and RICH2.

   figure1169
Figure 3.3: Results of tests on the photon detector prototype, using a UV lamp and a pad cathode plane without the CsI deposit: a) Spectra of signal amplitude for single photon detection; the efficiency for single photo-electron detection is 90% at 2100 V. b) Distribution of the number of cathode pads giving signal above threshold for single photon detection.

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Figure 3.4: Results of tests on the photon detector prototype, using a UV lamp and a pad cathode plane with the CsI deposit: a) Spectra of signal amplitude for single photon detection; the efficiency for single photo-electron detection is 90% at 2050 V. b) Distribution of the number of cathode pads giving signal above threshold for single photon detection.

In the following we discuss separately:



Lars Schmitt
Wed May 22 16:44:09 METDST 1996