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MRPC Beam Test @ GSI

MRPC Beam Test @ GSI. Yongjie Sun University of Science and Technology of China. Index. Test setup Preliminary results of 3 prototypes Summary. Accelerator. Setup. Our Beam Test Experiment. FOPI at Cave B. Setup. Proton Beam. Pb. 6m. 2m. TSU MRPC. 42 cm. PMT 1,2. PMT 5,6.

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MRPC Beam Test @ GSI

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  1. MRPC Beam Test @ GSI Yongjie Sun University of Science and Technology of China

  2. Index • Test setup • Preliminary results of 3 prototypes • Summary 14th CBM collaboration meeting

  3. Accelerator 14th CBM collaboration meeting

  4. Setup Our Beam Test Experiment FOPI at Cave B 14th CBM collaboration meeting

  5. 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 14th CBM collaboration meeting

  6. Photo of the setup 14th CBM collaboration meeting

  7. Beam Proton beam, Kinetic energy: 3.5 GeV/c 14th CBM collaboration meeting

  8. 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.) 14th CBM collaboration meeting

  9. Index • Test setup • Preliminary results of 3 prototypes • Summary 14th CBM collaboration meeting

  10. 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 14th CBM collaboration meeting

  11. MRPC #1 (topview) 2.5cm 24.1cm 0.6cm 55 cm • Gaps between strips: 0.6 cm 14th CBM collaboration meeting

  12. MRPC #1 +iso-butane 5%+Freon 14th CBM collaboration meeting

  13. <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> 14th CBM collaboration meeting

  14. 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) 14th CBM collaboration meeting

  15. Efficiency and resolution plateau 97% 65 ps 14th CBM collaboration meeting

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

  17. 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 14th CBM collaboration meeting

  18. TDC vs. QDC Valid TDCs and valid QDCs (3 sigma above pedestal) Valid TDCs 14th CBM collaboration meeting

  19. 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 14th CBM collaboration meeting

  20. Valid TDCs and QDCs MRPC #2 14th CBM collaboration meeting

  21. Efficiency vs. Position Valid TDCs 14th CBM collaboration meeting

  22. Valid TDCs and valid QDCs (3 sigma above pedestal) 14th CBM collaboration meeting

  23. 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) 14th CBM collaboration meeting

  24. MRPC #3 14th CBM collaboration meeting

  25. Efficiency vs. Position Valid TDCs 14th CBM collaboration meeting

  26. Summary • Three prototypes were successfully tested. • Efficiency: > 97% • Time resolution: 60-70 ps • Cross talk: < 3% • With position from silicon detectors, the data will be further analyzed. Thank you! 14th CBM collaboration meeting

  27. 14th CBM collaboration meeting

  28. Longitudinal 14th CBM collaboration meeting

  29. Double hit 14th CBM collaboration meeting

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