Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Instrumentierung

HK 51.4: Talk

Thursday, March 20, 2014, 17:30–17:45, HZ 9

The HADES RPC Time of Flight Wall performance in Au+Au Collisions at 1.23 AGeV — •Georgy Kornakov — TU Darmstadt

The HADES Resistive Plate Chamber (RPC) detector measures the time-of-flight of charged particles in the innermost part of the High Acceptance Di-Electron Spectrometer located at GSI, Darmstadt, Germany. Its main goal is to provide lepton identification at low momenta (p<400MeV/c) as well as identification of pi, K, p, He3, d/He4, t, studied by the experiment.

For the Au+Au beam time, a major improvement of the spectrometer in terms of granularity and particle identification capability was achieved by replacing the old TOFino detector by the new shielded timing RPC time-of-flight detectors. The gold beam provided by the SIS 18 accelerator with energy of 1.23 AGeV was colliding with a segmented gold target, creating in the RPC region mean multiplicities of 72 charged particles per event and in the most central ones of 150 charged particles.

Results show a RPC efficiency above 95 % and a mean time accuracy below 70 ps. In here we will describe the design and performance characteristics required to achieve the goal as well as the methods and algorithms used for calibration and correction of the data.