Gießen 2024 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 41: Instrumentation XI

HK 41.2: Gruppenbericht

Mittwoch, 13. März 2024, 16:15–16:45, HBR 19: C 5a

Status of the CBM Time-of-Flight system — •Ingo Deppner and Norbert Herrmann for the CBM collaboration — Physikalisches Institut, Uni. Heidelberg

In order to provide an excellent particle identification (PID) of charged hadrons at the future high-rate Compressed Baryonic Matter (CBM) experiment the CBM-TOF group has developed a concept of a 120 m² large Time-of-Flight (ToF) wall with a system time resolution below 80 ps based on Multi-gap Resistive Plate Chambers (MRPC). The MRPC detectors were extensively tested in several beam campaigns at particle Fluxes of up to a 30 kHz/cm² and reached by now the close to final design. Prior to its destined operation at the Facility for Antiproton and Ion Research (FAIR), a pre-production series of MRPCs is being used for physics research at two scientific pillars of the FAIR Phase0 program. At STAR, the Fixed-target program of the Beam Energy Scan II (BES-II) relies on 108 CBM MRPC detectors enabling forward PID for center of mass energies in the range of 3 to 7.7 AGeV Au+Au collisions. At mCBM, high-performance benchmark runs of Λ production at top SIS18 energies (1.5/1.9 AGeV for Au/Ni beams) and CBM design interaction rates of 10 MHz became feasible. Apart from the physics perspectives, these FAIR Phase-0 involvements allowed for high rate detector tests and long term stability tests. Observations and conclusions for the upcoming mass production will be discussed. The project is partially funded by BMBF contract 05P21VHFC1.

Keywords: Facility for Antiproton and Ion Research (FAIR); Compressed Baryonic Matter (CBM); Particle identification (PID); Time-of-Flight (TOF); Multi-gap Resistive Plate Chamber (MRPC)