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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 Yongjie Sun University of Science and Technology of China
Index • Test setup • Preliminary results of 3 prototypes • Summary 14th CBM collaboration meeting
Accelerator 14th CBM collaboration meeting
Setup Our Beam Test Experiment FOPI at Cave B 14th CBM collaboration meeting
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
Photo of the setup 14th CBM collaboration meeting
Beam Proton beam, Kinetic energy: 3.5 GeV/c 14th CBM collaboration meeting
DAQ Logic STOP NIMECL VULOM, Logic Discriminator T D C Delay NIMECL PMT 1-4(5) Delay Delay Discriminator NIMECL 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
Index • Test setup • Preliminary results of 3 prototypes • Summary 14th CBM collaboration meeting
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
MRPC #1 (topview) 2.5cm 24.1cm 0.6cm 55 cm • Gaps between strips: 0.6 cm 14th CBM collaboration meeting
MRPC #1 +iso-butane 5%+Freon 14th CBM collaboration meeting
<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
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
Efficiency and resolution plateau 97% 65 ps 14th CBM collaboration meeting
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
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
TDC vs. QDC Valid TDCs and valid QDCs (3 sigma above pedestal) Valid TDCs 14th CBM collaboration meeting
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
Valid TDCs and QDCs MRPC #2 14th CBM collaboration meeting
Efficiency vs. Position Valid TDCs 14th CBM collaboration meeting
Valid TDCs and valid QDCs (3 sigma above pedestal) 14th CBM collaboration meeting
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
MRPC #3 14th CBM collaboration meeting
Efficiency vs. Position Valid TDCs 14th CBM collaboration meeting
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
Longitudinal 14th CBM collaboration meeting
Double hit 14th CBM collaboration meeting