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Beam Test Results of USTC LMRPC modules (50cm)

Beam Test Results of USTC LMRPC modules (50cm). Yongjie Sun presnted by Hongfang Chen. Outline. Long-strip MRPC structure Results of August beam test at GSI Summary. MRPC structure (endview). Readout strips. HV. 5 x 250 μ m gaps. 5 x 250 μ m gaps. 2.5cm.

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Beam Test Results of USTC LMRPC modules (50cm)

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  1. Beam Test Results of USTC LMRPC modules (50cm) Yongjie Sun presnted by Hongfang Chen

  2. Outline • Long-strip MRPC structure • Results of August beam test at GSI • Summary

  3. 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

  4. MRPC #1 (topview) 2.5cm 24.1cm 0.6cm 55 cm • Gaps between strips: 0.6 cm

  5. 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

  6. 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)

  7. Setup Proton Beam Pb 6m 2m TSU MRPC 42 cm PMT 1,2 PMT 5,6 PMT 3,4 USTC MRPC y x Platform Platform Platform

  8. Photo of the setup

  9. DAQ Logic STOP NIMECL VULOM, Logic Discriminator T D C Delay NIMECL PMT 1-4(5) Delay Delay Discriminator NIMECL Gate LMRPC 1-6 (left) 7-12(right) Q D C FEE Delay • Trigger area: 2 cm x 4 cm (without back_scint.)

  10. <t2-(t3+t4)/2> <t1-(t3+t4)/2> ADC2 ADC1 ADC1 ADC2 <t3-(t1+t2)/2> ADC4 ADC3 ADC3 ADC4 <t4-(t1+t2)/2> PMT calibration

  11. Resolution~67 ps ((t3+t4)-(t1+t2))/4

  12. 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) HV=7kV

  13. Efficiency and resolution plateau 97% 67 ps

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

  15. Cross TalkMRPC #1 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

  16. Valid TDCs and QDCs Cross TalkMRPC #2

  17. Efficiency vs. PositionMRPC #2 Valid TDCs HV= 7kV

  18. Valid TDCs and valid QDCs (3 sigma above pedestal)

  19. Cross TalkMRPC #3

  20. Efficiency vs. PositionMRPC #3 Valid TDCs

  21. Track information using the data of SSD the following analysis is based on the instruction of : Y.P. Zhang,P.-A. Loizeau Data structure of final NTUPLE and a short description about how to use the silicon tracking system the data files used : run_0005.root, run_0006.root, ......, run_0020.root, where the USTC-MRPC was settled at the same position. run_0021.root, the MRPC moved by 12mm.

  22. 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

  23. Tranverse profile-- efficiency vs positionfor MRPC#1 run0005-0020

  24. Efficiency vs Positionfor MRPC#1 6mm-gap edge effects data file, run_0021.root

  25. Combined data

  26. Summary • The cross talk for neighbour strip ~3% for modules MRPC#1, 2, 3. (50cm strip) • Next step 1m long strip Thank You！ 谢谢！

  27. Signal Charge vs Position at the middle of strip near the edge of strip

  28. Time Resolution of PMT timing ( (t3+t4)-(t1+t2) )/4 after T-A correction Sigma(pmt) = 2.08 *35ps = 73ps

  29. RPC time resolution cuts: SSD cust PMT cuts resolution: sigma(rpc) = 69 ps 35ps/ch

  30. Hit tranverse profile position distribution

  31. pmt resolution vs position ((t3 + t4) - (t1 + t2) )/4

  32. rpc

  33. rpc resolution vs position

  34. eff and reo vs position

  35. Longitudinal

  36. edge effects the profile is also quite clear, and we can see that the beam hits between two strips of the MRPC

  37. (2) pmt cuts: • pmt-pair charge: q1+q2, q3+q4 • take out 5% at the low range side, and take another 25% at the high range side • time difference: T1-T2, T3-T4 • 2.5%, 2.5% • position difference: (T1-T2)-(T3-T4) • 2.5%, 2.5% • time of flight: ((T3+T4)-(T1+T2))/4 • 0.5%, 0.5%

  38. edge effects

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