Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Instrumentation V

HK 26.7: Vortrag

Dienstag, 28. März 2017, 15:45–16:00, F 102

Investigations of new 2 inch Hamamatsu Microchannel-Plate Photomultipliers — •Samuel Stelter, Merlin Böhm, Daniel Miehling, Albert Lehmann, Markus Pfaffinger, and Fred Uhlig for the PANDA collaboration — Physikalisches Institut, Universität Erlangen-Nürnberg

An important part of the PANDA experiment at the HESR/FAIR facility will be the two DIRC detectors. Their task is the identification of pions and kaons in the low GeV/c momentum region using the Cherenkov effect. The opening angle of the Cherenkov cone can be reconstructed from photons guided to the upstream end of a quartz radiator by internal reflection. Due to the fact that the DIRC focal planes will be located in a magnetic field of >1 Tesla, standard dynode photomultipliers (PMTs) are not usable for this experiment. Instead multi-anode Microchannel-Plate PMTs have to be used. The performance parameters of these MCP-PMTs have to be carefully measured concerning their suitability for the detector setup. The gain and its uniformity across the active surface, the cross-talk among the anode pixels, the behavior inside magnetic fields and the time resolution are some of the most important characteristics. Especially the finely segmented (0.4 mm pitch) sensors needed for the endcap disc DIRC require low cross-talk to reach the envisaged spatial resolution. This talk will present the measurement setups and the results of new 2x2 inch2 Hamamatsu MCP-PMT prototypes (8x8 and 6x128 anode pixels) developed for the PANDA DIRCs.

- Funded by BMBF and GSI -

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