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Long-strip MRPC for CBM

Long-strip MRPC for CBM. Yongjie Sun Key Laboratory of Technologies of Particle Detection & Electronics, CAS University of Science and Technology of China. Index. R&D on MRPC (STAR TOF, STAR MTD, … ) Long-strip MRPC for CBM August test at GSI Summary and Outlook. Early R&D (2000-2002).

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Long-strip MRPC for CBM

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  1. Long-strip MRPC for CBM Yongjie Sun Key Laboratory of Technologies of Particle Detection & Electronics, CAS University of Science and Technology of China

  2. Index • R&D on MRPC (STAR TOF, STAR MTD, …) • Long-strip MRPC for CBM • August test at GSI • Summary and Outlook CBM-China meeting

  3. Early R&D (2000-2002) beam test at PS-T10, CERN：efficiency >95%（5 gas gaps） >97%（6 gas gaps ） ~ 99%（double stack 2  5 gas gaps ） time resolution ~70ps（ 5 gas gaps ） ~60ps（ 6 gas gaps ） ~50ps（double stack 2  5 gas gaps ） MRPCs of different structures working gas mixture: F134A(90%)＋iso- C4H10 (5%)＋SF6(5%) M.Shao, L.J.Ruan, H.F.Chen et al., NIM A492(2002)344-350 60 CBM-China meeting

  4. TPC- tracking VPD - start time measurement MRPC TOF (TOFr) – stop time measurement STAR Upgrade -PID Particle momentum; dE/dx ~8% resolution /K separation to ~0.6GeV/c k/p separation to ~1.0GeV/c Aim at 100ps time resolution TOF system /K separation to ~1.6GeV/c & k/p separation to ~3.0GeV/c CBM-China meeting

  5. MRPC Structure for STAR/TOF Module size： 21.2×9.4×1.79 cm3 Gas gap：6×0.22mm In 200 GeV central Au+Au: Time resolution <100ps Efficiency  90% High granularity Rate >200Hz/cm2 MRPC strip size： 3.15cm×6.30cm CBM-China meeting

  6. 2007 2008 2006 1/2 3/4 5/6 7/8 11/12 1/2 3/4 5/6 7/8 1/2 3/4 5/6 7/8 11/12 9/10 9/10 Prod. Start 40 MRPCs +192 MRPCs +326 MRPCs +326 MRPCs +326 MRPCs MRPC Mass Production • After STAR Construction Readiness Review in April 2006, MRPC mass Production in China started. • University of Sci. & Tech. of China (USTC) will produce 1210 MRPCs CBM-China meeting

  7. USTC site - MRPC Mass production 100 m2 clean room ( cleanness class 100K ): Temperature： 25o C Humidity： <40% 4 assembly desk ( cleanness class 100 ) CBM-China meeting

  8. QC setup – cosmic ray telescope QC capability: 8 MRPCs / Day CBM-China meeting

  9. Monthly output Totally, 1283 MRPCs have been produced. CBM-China meeting

  10. Long time stability More stable at late production stage CBM-China meeting

  11. TOF Time Resolution Summary 2003 to 2009 CBM-China meeting

  12. STAR/MTD A large area of Muon Telescope Detector (MTD) at mid-rapidity,allows for the detection of di-muon pairsfrom QGP thermal radiation, quarkonia, light vector mesons, and Drell-Yan production single muonsfrom their semi-leptonic decays of heavy flavor hadrons advantages over electrons:no  conversion, much less Dalitz decay contribution, less affected by radiative losses in the detector materials CBM-China meeting

  13. (150kΩ/) 256mm Design and construction LMRPC -- side view 10 x 0.25 mm gas gaps in 2 stacks Glass thickness : 0.71 mm anode Short side cathode LMRPC PCB -- top view 950mm Long side Signal readout Size: 950 x 256 mm2 Read out strip: 25 mm wide, 4 mm gaps between strips Active area: 870 x 170 mm2 CBM-China meeting

  14. Photos of construction CBM-China meeting

  15. 449” 252” 73” 72” 191” 164” 56 81 33 TOF2 MWPC1 MWPC2 LMRPC C1, C2 70” TOF1 TOF3 MWPC3 GEMs MWPC4 Upper stream Down stream FNAL Beam Test (T963) Beam test setup MWPC5 Beam Energy: 32 GeV CBM-China meeting

  16. Results at T963 - I 60 Efficiency plateau Time resolution CBM-China meeting

  17. Results at T963 - II • Using the tracking, we get the signal propagation velocity: ~ 60ps/cm • The half time difference of 2 ends of a strip: σΔT/2 ~ 1.1 channel (55ps) • Position resolution: ~ 1 cm Position resolution 3 prototypes working very well in STAR since 2007 CBM-China meeting

  18. Long-Strip MRPC for CBM • Used in relative low track density environment to save electronics channels • Read out at two ends • Mean time Eliminate the position along the strip • Time difference  Position information • Easy to construct for large area coverage • Three Prototypes was test in August at GSI  The main focus: Cross-talk performance CBM-China meeting

  19. MRPC structure (endview) Readout strips HV 5 x 250μm gaps 5 x 250μm gaps 2.5cm • Readout strips: 2.5 cm x 50 cm • HV electrode: Licron spray ~40 MΩ/□ • Made of window glass of 0.7 mm thick CBM-China meeting

  20. MRPC #1 (topview) 2.5cm 24.1cm 0.6cm 55 cm • Gaps between strips: 0.6 cm CBM-China meeting

  21. MRPC #2 (topview) The readout strips are “hollowed-out” alternately. Removed: 5 mm x 4 Left: 1 mm x 5 Removed: 2.5 mm x 9 Left: 0.25 mm x 10 Top/bottom pcb CBM-China meeting

  22. MRPC #3 (topview) 2.5cm 0.7cm 24.1cm 0.8cm 55 cm • Gaps between strips: 0.7 cm (upper part) 0.8 cm (lower part) CBM-China meeting

  23. <t2-(t3+t4)/2> <t1-(t3+t4)/2> ADC2 ADC1 ADC1 ADC2 Resolution~67 ps <t3-(t1+t2)/2> ((t3+t4)-(t1+t2))/4 ADC4 ADC3 ADC3 ADC4 PMT calibration <t4-(t1+t2)/2> CBM-China meeting

  24. T-(t1+t2+t3+t4)/4 T-(t1+t2+t3+t4)/4 ADC <T-(t1+t2+t3+t4)/4> T-(t1+t2+t3+t4)/4 ADC MRPC Calibration Intrinsic timing resolution = 67 ps (including momentum spread) CBM-China meeting

  25. Efficiency and resolution plateau 97% 65 ps CBM-China meeting

  26. Position scan (±7 kV) Trigger Area: 2 cm wide No significant efficiency drop in the gap From both “charge sharing” and cross talk. CBM-China meeting

  27. Cross Talk Trigger Area: 2 cm wide Trigger on the strip center: “Cross talk” at neighbor strips: 3% “Cross talk” at next-to-neighbor strips: ~2% Require valid TDC on two ends CBM-China meeting

  28. TDC vs. QDC Valid TDCs and valid QDCs (3 sigma above pedestal) Valid TDCs CBM-China meeting

  29. Valid TDCs and QDCs MRPC #2 CBM-China meeting

  30. Efficiency vs. Position Valid TDCs CBM-China meeting

  31. Valid TDCs and valid QDCs (3 sigma above pedestal) CBM-China meeting

  32. MRPC #3 CBM-China meeting

  33. Efficiency vs. Position Valid TDCs CBM-China meeting

  34. Summary • USTC has experience on MRPC technology. • Capability of mass production • Manpower on online QA, calibration, related physics analysis • CBM RPC-TOF? Thank you! CBM-China meeting

  35. CBM-China meeting

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