Gießen 2007 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Poster
HK 49.27: Poster
Thursday, March 15, 2007, 16:00–17:00, P
Quality Assurance (QA) measurements for the mass production of FOPI’s Multi-strip Multi-gap Resistive Plate Chambers (MMRPCs) — •Xue-Ying Zhang for the FOPI collaboration — Gesellschaft für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany
The mass production of the MMRPCs for FOPI’s Time-of-Flight (ToF) upgrade is accomplished. This ToF upgrade which aims at a timing resolution σt< 100 ps for the whole MMRPCs barrel will improve the Kaon identification capability of FOPI substantially (Plab∼ 1 GeV/c) [1]. In order to assure the timing performance and quality of all detectors in the mass production, we implemented a QA-chain for the counters and electronics to keep the design parameters of the prototypes. A three stage test is applied for each Super-Module (consisting of 5 MMRPCs). First, we perform a High-Voltage (HV) test to assure its HV-stability up to 11 kV (125 kV/cm) and determine the background rates of the detectors. In a second step, we measure the performance of all counters with calibrated electronics using a gamma source to test the complete signal path, from the generation via amplification to digitization. Afterwards the counters are connected to the definite electronics and will be mounted eventually into FOPI. We will show the timing and efficiency performance of the MMRPCs using a proton beam together with the QA results for the mass production.
Supported by DAAD and BMBF 06HD953
[1] A. Schuettauf, and the FOPI collaboration, Nucl. Instr. and Meth. A 533 (2004) 65