Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 16: Instrumentation IV
HK 16.2: Group Report
Tuesday, March 28, 2017, 11:30–12:00, F 072
The CBM Time-of-Flight wall — •Ingo Martin Deppner and Norbert Herrmann for the CBM collaboration — Physikalisches Institut, Universität Heidelberg, Heidelberg
The Compressed Baryonic Matter spectrometer (CBM) is a future heavy ion experiment located at
the Facility for Anti-proton and Ion Research (FAIR) in Darmstadt, Germany. The main interest of
CBM is the investigation of the phase diagram of strongly interacting matter in the region of
the highest baryon densities. In order to measure the necessary observables with unprecedented
precision an excellent particle identification is required. The key element providing hadron identification at incident energies between 2 and 35 AGeV will be a 120 m2
large Time-of-Flight (ToF) wall composed of Multi-gap Resistive Plate Chambers (MRPC)
with a system time resolution better than 80 ps. The most demanding challenge, however,
is the enormous incident particle fluxes between 100 Hz/cm2 and 25 kHz/cm2 generated
at the highest interaction rates (10 MHz) that CBM is designed for.
The current conceptual design of the ToF-wall which is based on a modular structure composed of
modules containing 4 different counter types called MRPC1 - MRPC4 will be presented. In order to elaborate the final
MRPC design of these counters heavy ion test beam times were performed at SPS/CERN. In this
contribution we will present recent performance test results regarding time resolution, efficiency,
cluster size and rate capability for several counter types.
Work was supported partially by BMBF 05P2015 and by EU/FP7-HadronPhysics3/WP19.