München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 62: Instrumentation XIII

HK 62.5: Talk

Friday, March 22, 2019, 15:15–15:30, HS 11

Collection efficiency performance of recently developed Microchannel-Plate Photomultipliers — •Daniel Miehling, Merlin Böhm, Albert Lehmann, Markus Pfaffinger, and Samuel Stelter for the PANDA collaboration — Physikalisches Institut, Universität Erlangen-Nürnberg

Two Cherenkov detectors for hadron identification will be used for the PANDA experiment at the new FAIR facility. For both of these DIRC detectors the focal plane will be located inside a magnetic field of >1 T. Microchannel-Plate Photomultipliers (MCP-PMTs) are the chosen sensors for the detection of the Cherenkov photons. Typically the probability that an electron from the photo cathode is actually detected at the anodes is in the order of 60% for MCP-PMTs. This is called the collection efficiency (CE). PHOTONIS has built a new HiCE sensor which should reach 90% CE or even more. This is achieved with a special treatment of the microchannel-plates. In the Erlangen setup a measurement of the CE of different MCP-PMTs, older PHOTONIS and Hamamatsu and the new HiCE PHOTONIS tube, was performed. There are some challenging requirements for the measurement, namely a light source whose intensity is tunable over several orders of magnitude and a suitable setup for measuring very low currents in the range of picoampere. This talk will present the current setup and the latest obtained results. The focus will be on the comparison of various tubes with different lifetime enhancement methods applied like a protection film in the tube or ALD-coated (atomic layer deposition) MCPs.

- Funded by BMBF and GSI -