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Final design and plan for LMRPC production

Final design and plan for LMRPC production. Wang Yi on behalf of Tsinghua and USTC Department of Engineering Physics,Tsinghua University. Outline: LMRPC structure Material Production procedure and QC Performance test Time schedule. STAR Muon Telescope Detector.

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Final design and plan for LMRPC production

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  1. Final design and plan for LMRPC production • Wang Yi on behalf of Tsinghua and USTC • Department of Engineering Physics,Tsinghua University • Outline: • LMRPC structure • Material • Production procedure and QC • Performance test • Time schedule

  2. STAR Muon Telescope Detector • A large area of muon telescope detector (MTD) at mid-rapidity, allows for the detection of • di-muon pairs from QGP thermal radiation, quarkonia, light vector mesons, possible correlations of quarks and gluons as resonances in QGP, and Drell-Yan production • single muon from the semi- leptonic decays of heavy flavor • hadrons • advantages over electrons: no  conversion, much less Dalitz decay contribution, less affected by radiation losses in the detector • materials, trigger capability in Au+Au • trigger capability for low to high pT J/ in central Au+Au collisions • excellent mass resolution, separate different upsilon states • e-muon correlation to distinguish heavy flavor production from initial lepton pair production 2

  3. Concept of Design of the STAR-MTD            A detector with long-MRPCs covers the whole iron bars and leave the gaps in- between uncovered. Acceptance: 45% at ||<0.5 117 modules, 1404 readout strips, 2808 readout channels Long-MRPC detector technology, HPTDC electronics (same as STAR-TOF)           3

  4. MTD System Requirement • MTD requirements: • Time resolution less than 100 ps, spatial resolution ~ 1 cm. • The mechanics design must allow a convenient replacement of individual MTD box and access to the BEMC box. • The system must be able to operate in the fringe field from 0.5 Tesla STAR magnet field. • The system must operate at low noise rate. The total noise rate should be less than 0.5 M Hz, 1 Hz/cm2. • The system must be safe, meet all BNL safely requirements. • The system must not impair the performance of other STAR detectors.

  5. Structure of LMRPC module For assuring the stable performance, we will compare the performance between 5 and 6 gaps modules.

  6. Structure of LMRPC module

  7. Performance of LMRPC Cosmic ray test Beam test Time resolution ~ 70ps, efficiency> 95%

  8. Noise level @different gas mixture 95%Freon/5%iso-butane 94%Freon/5%iso-butane/1% SF6 Noise < 0.6 Hz/cm^2 @ 7200V Noise < 0.4 Hz/cm^2 @ 7200V LMRPC meets the MTD requirement!

  9. The materials for one LMRPC module 9

  10. Chinese LMRPC production • The LMRPC production is the same as STAR-TOF MRPC production, we have two production sites in China. • Tsinghua University (60%) • University of Science and Technology of China (40%) • Facilities and tools ensure quality. • Each site with QA and testing facility. • Web-based module-data-base accessible at the assembly sites. 10

  11. LMRPC manufacture milestones 2011 2012 Plan 1/2 3/4 5/6 7/8 9/10 11/12 1/2 3/4 5/6 11/12 7/8 9/10 Start 20 LMRPCs 40 LMRPCs 60 LMRPCs 80 LMRPCs 100 LMRPCs 115 LMRPCs VECC will produce 10% (15 ) modules 11 11

  12. Procedures of construction and QC Material procurement outer glass Mylar Honeycomb board PCB Graphite … Nylon wire Inner glass LMRPC assembly Electrode assembly No Check Yes No Check distance Between PCB Solder signal cable Yes Yes Label Yes Test amplitude and time No Check continuity Final check Yes No No

  13. Quality control on the material • Glass • Measure the dimensions • Check the surface quality • Pcb • Dimensions, • the scratch on the strips • Honeycomb • Dimensions, surface quality • Mylar foil: thickness, holes • Fishing line • Dimension check of each coil • Support block: thickness Material with faults will be returned back to factory.

  14. HV cables and signal connection • Rice and UT Austin will provide us HV and signal cables

  15. LMRPC Testing Procedure MRPC put in box For the first batch of LMRPC modules (about 20 modules), 100% strips will be tested for efficiency and time resolution. Later, 33% strips will be tested. Flushing with gas 48 hours, 100ml/min Exercise time: 10 hours HV:±7200V Measure current & noise rate Measure QDC & TDC 24×3 hours

  16. LMRPC mechanical specifications

  17. MRPC performance requirement

  18. Time schedule • 2011.4 – 2011.6  finalizing the design • Design modules with 5 and 6 gaps, test performance, detailed comparison. • Make a conclusion on the performance of different structure • with/without glue. • Help VECC to establish test system, production tools and some materials… • Module production: • 2011.6 – 2011.12  20% • 2012.1 – 2012.6  40% • 2012.7 – 2012.12  40%

  19. Thank you! 谢谢大家！

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