Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 32: Instrumentation 12
HK 32.3: Vortrag
Dienstag, 24. März 2015, 17:30–17:45, M/HS4
Measurements of recent microchannel-plate photomultipliers with significantly increased lifetime — •Fred Uhlig, Wolfgang Eyrich, Albert Lehmann, and Alexander Britting for the PANDA collaboration — Universität Erlangen, physikal. Institut IV
Microchannel-plate photomultipliers (MCP-PMTs) are the favored sensors for the DIRC detectors (Detection of Internally Reflected Cherenkov Light) of the PANDA experiment. They are usable in high magnetic fields of up to 2T and reach a time resolution of better than 50 ps (σ). The anticipated average luminosity of 2·1032 cm−2 s−1 in the detector requires a rate capability high enough to withstand a detected photon rate of about 200 kHz cm−2 at the MCP-PMT surfaces.
The major drawback until recently was the limited lifetime of MCP-PMTs, which appears to be solved for the latest generation of MCP-PMT prototype devices. The aging parameter is the quantum efficiency as a function of the integrated anode charge, which will be in the region of 5 C/cm2 for the Barrel- and the Disc-DIRC. We simultaneously measured the aging of several MCP-PMTs, which were treated with different methods to enhance the lifetime. Results of these measurements will be presented.
- supported by BMBF and GSI -