Aprodu, V.

Bartos, D.

Bercuci, A.

Caragheorgheopol, A.

Constantin, F.

Duta, V.

Petris, M.

Petrovici, M.

Prodan, L.

Radu, A.

Radulescu, L.

Simion, V.

GSI Repository

Cosmic-ray and in-beam tests of 100 Ohm transmission line MGMSRPCprototype developed for the inner zone of CBM-TOF ∗M. Petris¸1, V. Aprodu1, D. Bartos¸1, A. Bercuci1, G. Caragheorgheopol1, F. Constantin1, V. Dut¸aˇ1,M. Petrovici1, L. Prodan1, A. Radu1, L. Raˇdulescu1, and V. Simion11NIPNE, Bucharest, RomaniaAs a solution for the high granularity required for themost inner zones of the CBM-TOF, a new MGMSRPC pro-totype (called RPC2013), was designed and built. Con-structive details of the tested prototype are presented in [1].The strip structure of the readout and high voltage elec-trodes, (4.19 mm strip pitch with 2.16 mm width and200 mm strip length) was decided based on APLAC sim-ulations. The aim was to obtain a differential readoutimpedance as close as possible to 100 Ω in order to matchthe input impedance of the front-end electronics. The pro-totype is based on low resistivity (∼1010 Ω·cm) glass platesin order to cope with the high values of the counting rateanticipated for the inner zone of the CBM-TOF wall. Highcounting rate tests performed with MGMSRPCs using lowresistivity glass electrodes were already reported [2, 3].The response of the new prototype was first tested withcosmic rays and radioactive sources in the detector lab-oratory of Hadron Physics Department from IFIN-HH.The prototype was operated at 2 x 5.5 kV high voltagewith 95%C2F4H2 + 5%SF6 gas mixture. For this mea-surements the strip signals were processed by fast ampli-fiers/discriminators NINO chips [4], their differential out-put being converted by CAEN V1290A TDCs.Figure 1: Cosmic ray experimental set-up.The experimental setup used in the cosmic ray test is pre-sented in Fig. 1. The position along the strips, triggered bythe plastic scintillators positioned above the detector acrossthe strips, is presented in the left side of Fig. 2 as a functionof strip number. The right part of Fig. 2 shows the correla-tion between the position along the strip and position alongthe 10 cm length plastic scintillator, readout at both ends.The in-beam tests of this prototype were performed in anin-beam test campaign of CBM-TOF Collaboration in Oc-tober 2014 at GSI Darmstadt and at CERN-PS acceleratorin November 2014, in an in-beam test campaign of differentsubsystems of CBM Collaboration. In the CERN in-beam∗Work supported by EU-FP7/HP3 Grant No 283286 and Ro-manian NASR/CAPACITATI-Modul III contract RO-FAIR F02 andNASR/NUCLEU Project PN09370103Figure 2: Cosmic-ray test: left side - position along thestrip as a function of strip number; right side - correlationbetween position along the strips and position in the platicscintillator.test the MGMSRPC signals were processed by the sameelectronic chain as in the cosmic ray test. As referencefor time resolution estimation was used a plastic scintilatorreadout at both ends. Preliminary results show a time reso-lution of 52 ps using pure C2F4H2 and of 61 ps using a gasmixture of 95%C2F4H2 + 5%SF6, after performing walkcorrections and subtraction of the contribution of the refer-ence counter. The October 2014 in-beam test was focusedFigure 3: CERN in-beam test time spectrum using a gasmixture of 95%C2F4H2 + 5%SF6.on the compatibility with the PADI8 new FEE, aiming to beused in the CBM-TOF wall. The MGMSRPC signals wereconverted by FPGA TDCs [5]. Data analysis is in progress.References[1] V. Aprodu et al., CBM Progress Report 2013, p.79[2] M. Petrovici et al., JINST 7 (2012) P11003[3] A. Ba˘la˘ceanu et al., CBM Progress Report 2013, p. 78[4] F. Anghinolfi et al., Nucl.Instr.and Meth. A533(2004)183[5] J. Fru¨hauf et al. CBM Progress Report 2012, p.71MU-NQM-CBM-50 GSI SCIENTIFIC REPORT 201488 DOI:10.15120/GR-2015-1-MU-NQM-CBM-50

Cosmic-ray and in-beam tests of 100 Ohm transmission line MGMSRPC prototype developed for the inner zone of CBM-TOF

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Cosmic-ray and in-beam tests of 100 Ohm transmission line MGMSRPC prototype developed for the inner zone of CBM-TOF

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