Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 7: Instrumentation und Anwendungen
HK 7.1: Gruppenbericht
Freitag, 4. März 2005, 14:00–14:30, TU MA042
FOPIs MRPC-ToF Upgrade — •Andreas Schüttauf — GSI Planck Str.1 64291 Darmstadt
We present the results of the detector R&D for the new FOPI-ToF system at GSI. This proposed ToF-upgrade, an array surrounding the Central-Drift-Chamber (CDC) of FOPI, will have a size of 6 m2 with 600 individual cells. The time resolution needed is below σt ≤ 100 ps with a φ granularity of dφ ≤ 3o and a multihit capability. The use of Multigap Resistive Plate Chambers (MRPC) with segmented anodes seemed to be the most adequate solution in terms of time resolution, granularity and cost.
We will discuss the final MRPC-hardware design like the segmented anode structure (strip/pitch) as well as the optimized counter parameters for mass production. We have also developed a new Front End-Electronic- (FEE) which consists out of preamplifier (bandwidth of δ f∼ 1.5 GHz at a gain of g ∼ 200) followed by a discriminator stage. For the digitization we developed a TAC-ASIC based readout system which has an intrinsic electronic resolution of σE ≤ 10 ps. Altogeter 4800 electronic channels are needed. Finally we will present results on time resolution, efficiency and double hit capability of the setup.