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Experimental features of strip-RPCs

Experimental features of strip-RPCs. Motivation FOPIs M ultistrip- M ultigap- RPC s Results Conclusions. Motivation. CBM ToF wall area ~ 100 m 2 100 modules with ~ 1 m 2  t <80 ps e > 95 % rate ~ 2 -20 kHz/cm 2 ~ 60000 channels.

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Experimental features of strip-RPCs

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  1. Experimental features of strip-RPCs • Motivation • FOPIs Multistrip-Multigap-RPCs • Results • Conclusions 10 - 13.03.2009

  2. Motivation CBM ToF wall area ~ 100 m2100 moduleswith ~ 1 m2t<80 pse > 95 %rate ~ 2 -20 kHz/cm2~ 60000 channels Multi strip RPCs are one of the possibilities to fulfill the CBM-ToF requirements. The characteristical features of strip-RPCs can be determined with the FOPI Multistrip-Multigap-RPCs. 10 - 13.03.2009

  3. Capacitor block Multi-strip anode Multi-pin connector MRPC glass stack Mounting table MMRPC design FOPIs MMRPC - parameters active area 90 x 4,6 cm strips 16 strip / gap 1.64 / 0.9 mm glass thickness 1 mm / 0.5 mm number of gaps 2 x 4 gap width 220 mm gas: Reclin/SF6/iso-But 80/15/5 10 - 13.03.2009

  4. FOPI´s new ToF-barrel was used during the first Ni+Ni run in September 2007 FOPIs MMRPC barrel FEE 5 RPC Preamp. Disc. Elec. resol. FEE ~ 18 ps TAC ~ 10 ps t ~ 15 ps E < 25 ps Taquila 10 bit 12 bit QDC TAC free running common stop system at 40 MHz TAC ouput MMRPC Barrel characteristics: - 30 SM, 5 counters each with 16 strips - 4800 time + 2400 charge channels - active area 5.12 m2 - t<100 ps, e > 95 %, rate ~ 0,02kHz/cm2 QDC ouput input pulser 10 - 13.03.2009

  5. t < 94 ps t d p p [GeV/c] K+ p+ v [cm/ns] MMRPC performance system time resolution T.I. Kang 10 - 13.03.2009

  6. cluster Cluster size cluster = group of neighboring strips with signals generated by a single avalanche Cluster size drops at the edges- pure geometrical effect mean cluster size is  4.2 for the inner strips 11 mm 10 - 13.03.2009

  7. minimum ionizing particles Cluster charge vs. bg correlation between mean cluster charge and energy deposition of the particle (Bethe-Bloch) mean cluster charge 10 - 13.03.2009

  8. cathode ~5 mm ~ 5 mm strip: 1.64 mmgap: 0.6 mm anode strips Mean cluster charge - charge drops on the size strips - edge effects diminish the electrical field 10 - 13.03.2009

  9. intrinsic time resolution intrinsic time resolution = time difference between hits in different strips for one cluster in the middle region of the rpc the intrinsic time resolution is about 30 ps  electronic time res. The degradation towards the sides can be understood by the decreasing signal-to-noise ratio caused by the dropping pulse hight. 10 - 13.03.2009

  10. cluster size dependence Same argumentation as in the slide before. more strips per cluster more charge and pulse hight better signal-to-noise ratio  better intr. time resolution 10 - 13.03.2009

  11. cluster size dependence charge per cluster grows linearly with the cluster size 10 - 13.03.2009

  12. Conclusions • The FOPI MMRPC is ideal to study the characteristics of narrow strip counters. • - side effects are clearly identified  build larger structures. • cross talk does not seem to be a problem (so far) • multihit analysis just started RPC development for CBM active area 20 x 16,5 cm strips 8 strip / gap 19.1 / 0.9 mm 4 strips are subdivided sub-strip / gap 1.6 / 0.9 mm glass type float glass thickness 0.5 mm number of gaps 2 x 4 gap width 220 mm FOPI type read out pickup electrode 10 - 13.03.2009

  13. thank you People GSI – FOPI: Uni-HD: Korea University, K.Hildenbrand M.Ciobanu Seoul: T.I.Kang I.Deppner B.Hong Y.J.Kim N.Herrmann M.Kis P-A. Loizeau P.Koczon K.PiaseckiGSI-EE: Y.Leifels A.ReischlE.Badura M.Marquardt Y. Zhang R.Hardel W.Reisdorf K.Koch M.S.Ryu NIPNE Bucharest: N.Kurz A.Schüttauf M.Petrovici W.Ott J.Weinert V.Simion R.Schulze X.Zhang N.Zernezki 10 - 13.03.2009

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