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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Instrumentation und Anwendungen II

HK 26.7: Talk

Tuesday, March 11, 2008, 12:45–13:00, 2D

Nano composite materials for timing RPC — Frank Dohrmann¹, Roland Kotte¹, Lothar Naumann¹, Daniel Stach^1,2, Christian Wendisch^1,3, and •Jörn Wüstenfeld¹ — ¹Forschungszentrum Dresden - Rossendorf, Postfach 510119, 01314 Dresden — ²Hochschule für Technik und Wirtschaft Dresden, Friedrich-List-Platz 1, 01069 Dresden — ³Technische Universität Dresden, 01069 Dresden

The Compressed Baryonic Matter (CBM) experiment will be set up at the Facility for Antiproton and Ion Research(FAIR) near Darmstadt. CBM focuses on the investigation of baryonic matter at high densities and medium temperatures. This will be done by using dileptons as penetrating probes, which requires event rates of ≈ 10MHz. To measure the time of flight of all charged particles a wall of Resistive Plate Chamber (RPC) detectors will be used. Typically, those detectors are made of standard float glass, which has a volume resistivity between 10¹² and 10¹³ Ωcm. This gives a good efficency up to rates of 2 kHz/cm² in variance with the CBM requirements of 20 kHz/cm². One promising approach to achieve a higher rate capability while keeping the very good timing performance of this detectors is to reduce the volume resistivity by a few orders of magnitude. In this talk, we report on measurements done at the Electron Linac of high Briliance and low Emitance (ELBE) at the Forschungszentrum Dresden - Rossendorf. Efficiencies of RPC’s made of nano composite materials are presented and the suitability of using these materials as electrodes for RPC detectors will be discussed.