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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Instrumentation XII

HK 50.6: Vortrag

Donnerstag, 2. April 2020, 15:30–15:45, J-HS K

Afterglow and delayed gain recovery effects of recently developed Microchannel-Plate Photomultipliers (MCP-PMTs) — •Steffen Krauss, Merlin Böhm, Albert Lehmann, and Daniel Miehling — Physikalisches Institut, Universität Erlangen-Nürnberg

The new FAIR accelerator facility for antiproton and ion research is currently being built at GSI Darmstadt. The PANDA experiment will investigate antiproton-proton annihilations to study new QCD phenomena. For this an excellent particle identification is mandatory, accomplished by Cherenkov detectors of the DIRC-type. Because their focal planes reside inside an up to 1 Tesla magnetic field, lifetime-enhanced MCP-PMTs were chosen as sensors. Recent measurements with MCP-PMTs revealed unexpected effects like increased dark currents and gain losses after a high photon intensity illumination. After further studies these dark currents, here called afterglow, were identified as photons emitted from the MCPs. The other effect revealed itself in a gain loss which needs several seconds to minutes to recover to the gain level existent before the illumination. We call this a delayed gain recovery. For the high photon rates expected in the PANDA DIRCs it has to be guaranteed that these afterglow and delayed gain recovery effects have no negative impact on the MCP-PMT performance. This talk will discuss our investigations of the afterglow and delayed gain recovery effects.

- Funded by BMBF and GSI -