Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Instrumentierung

HK 14.7: Talk

Monday, March 17, 2014, 18:15–18:30, HZ 8

Single photon scans of various Multianode PMTs and XP85012 MCP ^* — •Christian Pauly for the CBM collaboration — Bergische Universität Wuppertal

Spatially resolved single Cherenkov photon detection is an essential requirement in building a Ring Imaging Cherenkov Detector (RICH).

We have set up a test stand to conduct single photon XY-scans in order to test and qualify different sensor devices for the CBM-RICH detector which is currently being designed as part of the future Compressed Baryonic Matter (CBM) experiment at FAIR.

Combining a pulsed laser source and step-motor XY-table with a self-triggered multi-channel acquisition system based on the nXYter readout ASIC allows to measure many different characteristic features of the sensor devices. Quantities like spatial resolved detection efficiency, spatial resolution, single photon response, channel-to-channel gain uniformity, after-pulsing, cross-talk, dark noise and active area can all be deduced from a single data set and thus allow for a comprehensive comparison of the evaluated sensors.

For the CBM RICH, we currently foresee the Hamamatsu H8500 2" or R11265 1" MAPMTs as baseline solution, alternatively we also consider using Photonis XP85012 MCPs. We present a detailed comparison of these sensor devices, including first measurements of the new H12700 MAPMT from Hamamatsu.

*supported by BMBF, 05P12PXFCE