SMuK 2021 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Instrumentation VII
HK 23.4: Vortrag
Donnerstag, 2. September 2021, 17:30–17:45, H2
Performance of highly pixelated Microchannel-Plate PMTs — •Katja Gumbert, Merlin Böhm, Steffen Krauss, Albert Lehmann, and Daniel Miehling — Physikalisches Institut, Universität Erlangen-Nürnberg
In the PANDA experiment at the new FAIR facility two DIRC detectors will be employed to identify hadrons using Cherenkov light. Since the photo-sensors of these detectors will be located inside magnetic fields of 1 Tesla, Microchannel-Plate Photomultipliers (MCP-PMTs) are the chosen type of sensors. One of the two DIRCs, the Endcap-Disc-DIRC (EDD), which is located in the forward direction of the interaction point, requires a high spatial resolution in one dimension to reconstruct the Cherenkov angles. For this purpose PHOTONIS has built 2-inch MCP-PMTs with a backplane of 3x100 anode pixels.
In Erlangen measurements are being carried out to verify that these MCP-PMTs meet the performance requirements of the EDD. The sensors must have a high detection efficiency (DQE = QE · CE) because only a small number of single photons is expected per track. Thus the quantum efficiency (QE) and the collection efficiency (CE) have to be high. Furthermore the gain needs to be at least 106 and should not drop significantly in the magnetic field. Moreover the sensors are required to have a good time resolution of 100 ps and need to sustain high photon rates of up to 10 MHz/tube. The results of the performance measurements of four tubes will be presented in this talk.
- Funded by BMBF and GSI -