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长读出条 MRPC 性能研究

长读出条 MRPC 性能研究. 孙勇杰 Key Laboratory of Technology of P a rticle Detection and Electronics, USTC-IHEP, CAS Center of Particle Physics and Technology, USTC. Introduction. MRPC.

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长读出条 MRPC 性能研究

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  1. 长读出条MRPC性能研究 孙勇杰 Key Laboratory of Technology of Particle Detection and Electronics, USTC-IHEP, CAS Center of Particle Physics and Technology, USTC

  2. Introduction MRPC MRPC (Multi-gap Resistive Plate Chamber) is a major new detector technology first developed by the ALICE experiment. The concept first published on Nucl. Instr.& Meth. A374 (1996) 132 by M.C.S.Williams et al. • Advantages: • Time resolution • High efficiency • Low cost • Arbitrary readout shape Good candidate for large area Time-Of-Flight system ! NanChang University

  3. ~3cm ~6cm MRPC—signal pickup STAR TOF ALICE TOF Long-strip readout: • save electronics channels. • Read out at two ends • Mean time Eliminate the position along the strip • Time difference  Position information NanChang University

  4. MTD Possible applications • STAR MTD (Muon telescope Detector) • CBM TOF Wall (outer part) NanChang University

  5. LMRPC Prototype-I Size: 950 x 256 mm2 Readout strip: 25 mm wide, 4 mm gaps between strips Active area: 870 x 170 mm2 Gas gaps: 10 x 0.25 mm, in 2 stacks Glass: 0.7 mm HV electrode: ~200 kΩ/□ NanChang University

  6. Cosmic ray test setup • Trigger area: 20 x 5 cm2 • Time reference (T0) • TOF MRPC was used to get 6 segments along the strip. • Gas: 95% Freon + 5% iso-butane • HV=±6.3 kV LMRPC NanChang University

  7. Cosmic ray test results NanChang University

  8. FNAL Beam Test (T963) 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 Beam test setup MWPC5 Beam Energy: 32 GeV NanChang University

  9. Beam Test results Time resolution Efficiency plateau Position resolution: ~ 1 cm 1/v ~ 60ps/cm NanChang University

  10. 25 mm 241mm 6 mm Readout strips 550 mm 2.5cm LMRPC prototype-II • Readout strips: 2.5 cm x 50 cm • Gaps between strips: 6 mm • Gas gaps: 10 x 0.25 mm, in 2 stacks • Glass: 0.7 mm • HV electrode: ~40MΩ/□ NanChang University

  11. Beam test @GSI Beam Test setup FOPI experiment Proton Beam Pb 6m 2m SSD PMT 1,2 42 cm THU MRPC PMT 3,4 SSD USTC MRPC y x Platform Platform Platform NanChang University

  12. PMT Resolution ~67 ps T-(t1+t2+t3+t4)/4 T-(t1+t2+t3+t4)/4 ADC ((t3+t4)-(t1+t2))/4 <T-(t1+t2+t3+t4)/4> ADC T-(t1+t2+t3+t4)/4-f(A) MRPC Calibration MRPC time resolution ~ 67 ps @=±7 kV. (including momentum spread) NanChang University

  13. Efficiency and resolution plateau 97% 67 ps NanChang University

  14. Position scan (±7 kV) Trigger Area: 2 cm wide No significant efficiency drop in the gap From both “charge sharing” and cross talk. NanChang University

  15. Cross Talk Trigger on the strip center: “Cross talk” at neighbor strips: <~3% Trigger Area: 2 cm wide Valid TDCs and valid QDCs (3 sigma above pedestal) Valid TDCs NanChang University

  16. Hits position profile on MRPC the profile is about 3cm x 2 cm the following analysis will base on these SSD position cuts and charge cuts NanChang University

  17. Transverse profile—strip center NanChang University

  18. 6mm-gap Transverse profile—strip edge NanChang University

  19. Combined NanChang University

  20. Summary • Long (0.5 m, 0.9 m) readout-strip MRPCs were successfully constructed and tested. • Efficiency: > 97% • Time resolution: 60-70 ps • spatial resolution: less than 1 cm. • Cross talk: < 3% • LMRPC shows prospective application as TOF in low multiplicity environments. • Two LMRPCs (0.9m) have already been installed to STAR as part of the MTD detector and have successfully taken data since year 2007. Thank you! NanChang University

  21. NanChang University

  22. NanChang University

  23. Longitudinal Valid TDC Valid TDC & QDC NanChang University

  24. charge vs position NanChang University

  25. Signal Charge vs Position at the middle of strip near the edge of strip NanChang University

  26. 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 NanChang University

  27. 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) NanChang University

  28. Valid TDCs and QDCs Cross TalkMRPC #2 NanChang University

  29. Efficiency vs. Position Valid TDCs HV=±7 kV NanChang University

  30. Valid TDCs and valid QDCs (3 sigma above pedestal) NanChang University

  31. Cross TalkMRPC #3 NanChang University

  32. Efficiency vs. Position Valid TDCs 7mm-gap between strips NanChang University

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