Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Instrumentation VII

HK 26.1: Talk

Tuesday, March 29, 2022, 16:00–16:15, HK-H3

Performance and quality testing of frontend electronics for the CBM RICH detector ^* — •Pavish Subramani for the CBM collaboration — University of Wuppertal

The CBM experiment is a high collision rate rate experiment, producing estimated single Cherenkov photon rates of up to ∼ 300 kHz per pixel in its Ring Imaging Cherenkov Detector (RICH). Signals of the 8×8 pixel Multianode Photomultiplier Tubes (MAPMT) are digitized using the FPGA-TDC based DIRICH frontend readout chain, providing excellent timing precision. A dedicated lab setup producing realistic detector signals using a pulsed laser light source was set up in order to validate the high rate capability of the DIRICH readout. It is found that individual readout channels can withstand photon rates up to 2.2 MHz/pixel, limited only by maximum data rate capability and buffer size on the frontend board. In addition, also effects of high photon occupancy on the MAPMTs were investigated, which might cause additional signals due to capacitive cross talk within the MAPMT or readout chain. Occupancies of up to 55 % (simultaneous photon hits on more than half of the MAPMT pixels) were investigated, indicating that in the expected occupancy range of 10–15 % the readout works flawlessly with very low crosstalk. The talk will focus on the laboratory test setup and qualification measurements of the readout chain obtained herewith.

^* supported by BMBF (05P19PXFCA, 05P21PXFC1) and GSI.