Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 46: Instrumentation
HK 46.4: Vortrag
Dienstag, 5. März 2013, 17:30–17:45, WIL-A221
Significantly increased lifetime of recent microchannel-plate photomultipliers — •Alexander Britting, Wolfgang Eyrich, Albert Lehmann, and Fred Uhlig — Physikalisches Institut, Universität Erlangen-Nürnberg
Microchannel plate photo multipliers (MCP-PMT) are the favored sensors for the DIRC detectors (Detection of Internally Reflected Cherenkov Light) of the PANDA experiment. The main reasons for this are their usability in high magnetic fields of up to 2 T, a time resolution of better than σ = 50 ps and a rate capability high enough to withstand a detected photon rate of about 200 kHz cm−2 at the MCP-PMTs surface, which is anticipated at the average luminosity of 2 · 1032 cm−2s−1 in PANDA. Moreover, for the reconstruction of the Cherenkov angle using the planned optics for the barrel DIRC a spatial resolution of about 5 mm at the focal plane is needed .
Until recently the major drawback of MCP-PMTs was their limited lifetime which was by far not sufficient to stand the integrated anode charge, which is ≈ 5 C/cm2 for the Barrel-DIRC and even more for the Disc-DIRC. However, the latest MCP prototype devices show a hugh step forward in this respect. The results of these lifetime measurements will be presented. The achieved values are meanwhile close to the PANDA requirements for the Barrel-DIRC.
- supported by BMBF and GSI -