Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Instrumentierung VI
HK 27.9: Vortrag
Dienstag, 22. März 2011, 18:30–18:45, HS1
Lifetime of microchannel-plate photomultipliers for the PANDA-DIRC — •Alexander Britting, Wolfgang Eyrich, Albert Lehmann, and Fred Uhlig — Physikalisches Institut IV, Universität Erlangen-Nürnberg
At the PANDA experiment the particle identification will be accomplished by using DIRC detectors (Detection of Internally Reflected Cherenkov Light). By total reflection inside the radiator the Cherenkov photons are guided to the photo sensors.
With the planned optics at the barrel DIRC a spatial resolution of about 5 mm at the focal plane will be necessary for the reconstruction of the Cherenkov angles. Because of their advantageous properties especially inside a magnetic field multi-anode microchannel plate photo multipliers (MCP-PMT) are the favoured sensor types.
With the anticipated average luminosity of 2 · 1032 cm−2s−1 this implies a rate of detected photons of about 200 kHz cm−2 at the MCP-PMTs surface. However, a major drawback of MCP-PMTs is still their lifetime. At these photon rates an integrated charge of about 1 C cm−2 a−1 will be collected at the MCP anode which is well beyond the amount currently available devices can stand. In Erlangen we have investigated a few types of multi-anode MCP-PMTs, especially lifetime enhanced tubes not commercially available yet. The results of these lifetime measurements will be presented.
- supported by BMBF and GSI -