München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Instrumentation X and Applications

HK 45.2: Talk

Wednesday, March 20, 2019, 17:00–17:15, HS 12

Simulating the high-rate performance of MRPC detectors for the CBM TOF wall — •Christian Simon and Norbert Herrmann for the CBM collaboration — Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg

The large-area time-of-flight (TOF) wall of the future Compressed Baryonic Matter (CBM) experiment is composed of multi-gap resistive plate chambers (MRPC). In CBM, heavy nuclei are accelerated to kinetic energies of up to 11 AGeV (SIS100) and interact in a fixed-target geometry at unprecedented rates of up to 10 MHz which generates strongly varying particle fluxes on the TOF wall. Closer to the beam pipe where several tens of kHz/cm² are expected, low-resistive glass will serve as resistive material for the MRPC detectors while the periphery of the rectangular 120 m² wall has been designed with float-glass counters which do not need to (and can intrinsically not) cope with fluxes of more than a kHz/cm². To facilitate the analysis and interpretation of results from in-beam rate tests of MRPC prototypes, equipped with both types of glass, a dedicated MRPC rate-response simulation has been developed in the CbmRoot software framework. The parametric description of the detector response function with respect to incident particle flux allows for reproducing and predicting the MRPC performance under a given load once the model parameters are derived from experimental test beam data. An exemplary simulation of an MRPC in-beam test at CERN/SPS in 2015/16 will be presented. The project is partially funded by BMBF 05P15VHFC1.