Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Instrumentation
HK 19.6: Vortrag
Dienstag, 20. März 2012, 18:00–18:15, P 3
Lifetime measurements of MCP-PMTs of the latest generation — •Alexander Britting, Wolfgang Eyrich, Albert Lehmann, and Fred Uhlig — Physikalisches Institut, Universität Erlangen-Nürnberg
Particle identification for the PANDA experiment will be acomplished by the usage of DIRC detectors (Detection of Internally Reflected Cherenkov Light). In these the guidance of the Cherenkov photons will be done by total reflection inside the radiator to the photon sensors.
Prospective sensor candidates are microchannel-plate photomultipliers (MCP-PMTs), since they achieve excellent time resolutions of about 30-50ps, high rate stabilities of a few MHz cm−2 and can be operated in magnetic fields, which are expected to be up to 2T in PANDA.
The high PANDA luminosity of 2 · 1032 cm−2s−1 results in detected photon rates of about 200 kHz cm−2 for the barrel DIRC. This accumulates to an integrated charge of about 1 C cm−2 a−1 at the MCP anode assuming 100% duty cycle. Former MCP devices were not able to fulfill such lifetime requirements. However, the latest developments in the production of MCP-PMTs tremendously pushed this barrier. In Erlangen we are investigating new devices of different manufacturers of either multi-anode or single-anode designs. The results of the latest lifetime measurements will be presented.
- supported by BMBF and GSI -