Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Instrumentation VIII

HK 21.2: Vortrag

Dienstag, 27. Februar 2018, 14:30–14:45, HZO 90

Setup and first results of quality assurance measurements with MCP-PMTs — •Merlin Böhm, Rafael Frytz, Albert Lehmann, Daniel Miehling, Markus Pfaffinger, and Samuel Stelter for the PANDA collaboration — Physikalisches Institut, Universität Erlangen-Nürnberg

For the planned DIRC detectors (detection of internally reflected Cherenkov light) of the PANDA experiment several hundred microchannel-plate photomultipliers (MCP-PMTs) are required. The PMTs must have a good time resolution and a homogeneous gain and quantum efficiency across the active surface. To measure, among others, the position dependent time resolution, gain and dark count rate (DCR), we have built a semi-automatic quality control measurement setup in a light tight box consisting of a 3D-stepper and a picosecond laser pulser. Number of hits, timing and pulse height data for each anode channel are parallelly read out with the PADIWA-AMP2/TRB3 DAQ system from GSI. In first test measurements the laser was scanned across the surface of different MCP-PMTs. With these measurements, besides the mentioned properties, we could also easily study background sources like DCR, afterpulsing probability and recoil ion TOF distributions, crosstalk among the anode channels like charge sharing and electronics effects, and the distributions of electrons recoiling at the first MCP layer.

- Gefördert durch BMBF und GSI -