SMuK 2021 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 23: Instrumentation VII

HK 23.3: Vortrag

Donnerstag, 2. September 2021, 17:15–17:30, H2

Magnetic field performance of the latest 2-inch MCP-PMTs — •Steffen Krauss, Merlin Boehm, Katja Gumbert, Albert Lehmann, and Daniel Miehling for the PANDA collaboration — Physikalisches Institut , Universität Erlangen-Nürnberg

The PANDA experiment at FAIR will employ two Cherenkov detectors of the DIRC-type for pion/kaon separation. Since the focal planes of both DIRC detectors are located in a 1 Tesla B-field, Microchannel-Plate Photomultipliers (MCP-PMTs) are the only viable option to detect the generated Cherenkov photons. Their magnetic field performance is an essential characteristic of the MCP-PMTs and was investigated at conditions similar to those of the later experiment. In this context the most important quantity is the gain behavior as a function of the B-field strength and direction. MCP-PMTs from Photonis with 10 µ m pores, varied internal dimensions, and anode layout with 8×8 and 3×100 pixels were investigated. The further studied MCP-PMTs from Photek Ltd with 6 µ m pore diameter show a different B-field behavior. Also internal properties like crosstalk and charge cloud width, time resolution and electron recoil distributions were measured with a FPGA based TRB/PADIWA DAQ system. This was done with xy-scans across the photo cathode inside the B-field for the first time.

- Funded by BMBF and GSI -