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GSI SCIENTIFIC REPORT 2008 INSTRUMENTS-METHODS-32 In-Beam Test Results of the Pestov Glass Resistive Plate Counter Prototypes ∗

By D. Bartos, G. Caragheorgheopol, F. Dohrmann, K. D. Hildenbr, B. Kaempfer, R. Kotte, M. Petris, M. Petrovici, V. Simion, D. Stach, C. Williams and J. Wuestenfeld


foresees a time-of-flight (TOF) wall equipped with resistive plate chambers (RPC) 10 m downstream from the target. The inner part of the TOF covers 50-100 mrad around the beam axis with an estimated flux densities of charged particles up to 20 kHz/cm 2. The rate capability of the present RPC based on comercial float glass (∼10 12 Ω·cm) as electrodes is limited at about 1 kHz/cm2. We designed and built two new prototypes of multi-gap, multi-strip RPCs based on Pestov glass of 10 10 Ω·cm bulk resistivity: one with standard readout- single-ended and the other one with differential readout. The experiment has been performed at the electron linac ELBE at the Forschungszentrum Dresden-Rossendorf following the procedure described in [1]. Results of the inbeam tests of these two prototypes are presented in the following. In the first part of the measurements a standard multistrip, multigap RPC architecture [2, 3]) based on Pestov glass [4] was used. The counter was operated at 5.8 kV using standard gas mixture (85 % C2H2F4+5 % iso-C4H10+10 % SF6). The signals of four strips read-out at both sides have been recorded. For the signal amplification we used the first generation of fast amplifier/discriminator (called FEE1) developed for FOPI RPCs at GSI [5] providing both timing and charge information for each channel. The time of flight distribution, for each measured strip, was obtained as the mean of the time information at both ends (tleft + tright)/2. The obtained time resolutions, afte

Year: 2010
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