SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 56: Instrumentation XV
HK 56.3: Vortrag
Donnerstag, 23. März 2023, 14:45–15:00, SCH/A.101
Performance of the first mass production MCP-PMTs for the PANDA Barrel DIRC and lifetime of the latest MCP-PMTs — •Katja Gumbert, Merlin Böhm, Steffen Krauss, Albert Lehmann, and Daniel Miehling for the PANDA collaboration — Physikalisches Institut, Universität Erlangen-Nürnberg
In the PANDA detector at FAIR two DIRC detectors will be used for particle identification using Cherenkov light. Since the focal planes of both DIRCs are located inside magnetic fields of 1 Tesla, Microcannel-Plate Photomultipliers (MCP-PMTs) will be used to detect the few Cherenkov photons. The Barrel DIRC, which will surround the beam line and the interaction point, will be equipped with 128 MCP-PMTs of the type XP85112-S-BA by PHOTONIS with an active area of 2x2 inch2, 8x8 anode pixels and a pore diameter of 10 µ m of the MCPs. As part of the quality controll process Erlangen will measure performance parameters like the efficiency, both quantum and collection efficiency, the gain distribution, the time resolution, the afterpulse probability and the rate capability of these sensors.
The quantum efficiency of former MCP-PMTs dropped after only a few hundred mC/cm2 integrated anode charge due to feedback ions produced in the residual gas. These ions are accelerated back to the photo cathode and may damage it. This aging problem was significantly reduced by applying an ALD coating (atomic-layer deposition) to the MCP pores. Both the lifetime performance of the latest tubes and the performance of the first Barrel DIRC MCP-PMTs will be shown in this talk. - Funded by BMBF and GSI -