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Fast TRD - R&D Status

C. B. M. Fast TRD - R&D Status. • Introduction • Short review - First HCRTRD prototypes: - MWPC – w & w/o drift zone - GEM - Second HCRTRD prototypes - MWPC – double sided

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Fast TRD - R&D Status

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  1. C B M Fast TRD - R&D Status •Introduction • Short review - First HCRTRD prototypes: - MWPC – w & w/o drift zone - GEM - Second HCRTRD prototypes - MWPC – double sided - GEM Counting rate performance: • charge • pulse height • position resolution • e/ discrimination • Third HCRTRD prototype – real size cell • Conclusions Mihai Petrovici, CBM-Meeting, Feb. 26-29, 2008, GSI

  2. Baseline Detector Setup Tracking: STS, TRD Vertexing: STS Hadron ID : TOF Electron ID: RICH, TRD, ECAL γ, n: ECAL The Challenge: • very rare probesin Au+Au at reaction rates up to 107events/sec • ~ 1000 charged particle/event CBM - TRD Counting rates ~ 105 part/sec/cm2 High granularity - rej (at 90% e efficiency) > 100

  3. First HCRTRD - prototype • type: radiator + MWPC • anode-cathode distance–3 mm • 2.5 mm anode pitch • - maximum drift time ~ 100 ns • - channel size ~ 6 cm2 1 GeV/c UA = 1900 V Xe,CO2 (15%) Rohacell

  4. ALICE-TRD

  5. Second HCRTRD - prototype Readout electrode pad size: 5 x 10 mm2 Anode 20 μm , WAu 2.5 mm pitch

  6. High Counting Rate EffectXe,CO2(15%), p-1.5 GeV/c 1.2 % 6.1 % - 5.1 % 4.3 %

  7. Rate Dependence for 300 Tilted Chamber 1800 V 1.2 % 1.2 % 1.2 % 1.2 % 2.5 % 1.2 % 3.4 % 1.2 %

  8. Rate Dependence of the Position Resolution

  9. e/discriminationperformance 1.5 GeV/c log(pe/p ) pe/(pe + p ) 20/500/120 20/500/120  1800 V, foils, ~ 0.7 %  rejection 20/500/120  20/200/220, 1.4 better

  10. e/discriminationperformance Xe,CO2(15%) 1 GeV/c,UA = 1900 V 1.5 GeV/c,UA = 1800 V 1.5 GeV/c,UA = 1800 V

  11. e/discriminationperformance ALICE - TRD Taku Gunji – ALICE TRD

  12. e/ discrimination – counting rate dependence e 

  13. Conclusions •TRD based on compact geometry MWPC works up to > 2•105 particles/cm2/sec with negligible change of pulse height or charge (~2-3%) •The position resolution at low rate is ~160 m; the observed degradation is ~20 m at 2•105 particles/cm2/sec; •A double-sided pad readout electrode brings the performance of these TRD at a  rejection factor of ~200 for 6 layers using appropriate foil stack radiator.  • The solution for: • high counting rate • high granularity • high e/ rejection factor • minimum material budget • minimum electronic channels

  14. Third HCRTRD - prototype

  15. Participants NIPNE-Bucharest University of Münster D. Bartos M. Petris M. Hoppe I. Berceanu M. Petrovici A. Wilk V. Catanescu V. Simion J.P. Wessels A. Herghelegiu P. Dima C. Magureanu A. Radu D. Moisa GSI - Darmstadt University of Heidelberg A. Andronic C. Lippmann D. Emschermann P. Braun-Munzinger D. Miskowiecz I. Rusanov C. Garabados R. Simon H.K. Solveit J. Hehner H. Stelzer J. Stachel M. Kalisky F. Uhling University of Frankfurt JINR Dubna H. AppelshäuserV. Babkin V. Golovatiouk S. Chernenko Yu. Zanevsky V. Geger V. Zryuev Double sided read-out pad plane electrode prototype : In beam tests :

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