Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 7: Instrumentierung
HK 7.4: Vortrag
Montag, 17. März 2014, 14:45–15:00, HZ 9
Measurements of recent microchannel-plate photomultipliers with significantly increased lifetime — •Alexander Britting, Wolfgang Eyrich, Albert Lehmann, and Fred Uhlig for the PANDA collaboration — Physikalisches Institut, Universität Erlangen-Nürnberg
Due to their usability in high magnetic fields of up to 2 Tesla and a time resolution of better than σ = 50 ps microchannel-plate photomultipliers (MCP-PMT) are the favored sensors for the DIRC detectors (Detection of Internally Reflected Cherenkov light) of the PANDA experiment. The anticipated average luminosity of 2 · 1032 cm−2s−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-PMTs surface. This rate accumulates to an integrated anode charge for the MCP-PMTs of ≈5 C/cm2 for the Barrel DIRC and even more for the Endcap Disc DIRC after a 10 years operation time of PANDA.
The major drawback up to now was the limited lifetime of MCP-PMTs, which seems to be solved for the most recent MCP prototype devices. The main aging parameter is the quantum efficiency as a function of the integrated anode charge. We performed lifetime measurements for several MCP-PMTs, which correspond to different stages of lifetime enhancement. Results of these measurements will be presented. The achieved lifetimes now match the PANDA requirements for the Barrel-DIRC.
- supported by BMBF and GSI -