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Preparation of MTD production

Preparation of MTD production. Yongjie Sun C enter of P article P hysics and T echnology U niversity of S cience and T echnology of C hina. Outline. Introduction Design of MRPC for MTD The first prototype The “ real size ” prototype Facilities for the mass production

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Preparation of MTD production

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  1. Preparation of MTD production Yongjie Sun Center of Particle Physics and Technology University of Science and Technology of China

  2. Outline • Introduction • Design of MRPC for MTD • The first prototype • The “real size” prototype • Facilities for the mass production • Summary and outlook STAR MTD workshop, USTC

  3. 1. STAR MTD • 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 muons from their semi- leptonic decays of heavy flavor • hadrons • advantages over electrons:no  conversion, much less Dalitz decay contribution, less affected by radiative losses in the detector • materials, trigger capability in Au+Au Z. Xu, BNL LDRD 07-007; L. Ruan et al., Journal of Physics G: Nucl. Part. Phys. 36 (2009) 095001 STAR MTD workshop, USTC

  4. The novel design of MTD • Iron bars as absorber • Muon ID by combining • Track matching with MTD spatial resolution • Energy loss in TPC • Time-of-flight measurement time resolution • MRPC as detector • Good timing: < 100 ps • Spatial resolution: ~ 1 cm • Cost-effective for large area coverage STAR MTD workshop, USTC

  5. The success of MRPC for STAR TOF Muon Detector Time resolution <100ps Efficiency  90% High granularity STAR MTD workshop, USTC

  6. MRPC with Long Strips • The multiplicity of muon tracks is quite low • Long strips save electronics channels • Read out from two ends • Mean time Eliminate the position along the strip • Time difference  Position information • Easy to build for large area coverage detector STAR MTD workshop, USTC

  7. 2. Prototype design The first prototype was constructed in 2006 at USTC. anode Size: 950 x 256 mm2 Read out 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 plates:0.71 mm 1.5 cm STAR MTD workshop, USTC

  8. The considerations in the design • 10 gaps: for better timing • 2.5 cm wide strips: for better track matching • The size: limited by the pcb production technics • The edges: sufficient for uniform field and HV protecting. STAR MTD workshop, USTC

  9. Some photos STAR MTD workshop, USTC

  10. Cosmic ray test Telescope 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=±6.4kV LMRPC STAR MTD workshop, USTC

  11. Cosmic ray test STAR TOF MRPC PAD: 3.15 x 6.1 cm2 Trigger area: 20 x 5 cm2 Trigger area and ADC spectrum Scheme of the trigger ADC ch ADC ch Left end ADC Spectrum Right end ADC Spectrum STAR MTD workshop, USTC

  12. Cosmic ray test HV plateau STAR MTD workshop, USTC

  13. Cosmic ray test signal propagation velocity • TOF MRPC 6 trigger positions along the strip • Time difference of 2 ends vs. position V-1~59.6±4.9 ps/cm STAR MTD workshop, USTC

  14. Cosmic ray test T-A correction & Time resolution center of the strip T-A correlation One end of the strip STAR MTD workshop, USTC

  15. 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 STAR MTD workshop, USTC

  16. FNAL Beam Test (T963) Efficiency plateau Time resolution STAR MTD workshop, USTC

  17. FNAL Beam Test (T963) Spatial resolution • Using the tracking, we get the signal propagation velocity: ~ 60ps/cm • The half time difference of 2 ends of a strip: σΔT/2 ~ 1.1 channel (55ps) • Spatial resolution: ~ 1 cm STAR MTD workshop, USTC

  18. Running in STAR Run 7 & Run 8 Run 9 & Run 10 STAR MTD workshop, USTC

  19. Run 10 Performance: Time and Spatial Resolution L. Li, UT Austin pure muons average pT: ~6 GeV/c σ: 109 ps Cosmic ray trigger: Total resolution: 109 ps Start resolution (2 TOF hits): 46 ps Multiple scattering: 25 ps MTD intrinsic resolution: 96 ps System spatial resolution: 2.5 cm, dominated by multiple scattering σ: 2.5 cm From Lijuan Ruan’s talk at MTD review Sep. 17, 2010 STAR MTD workshop, USTC

  20. Run 9 Performance: Time Resolution L. Li, UT Austin Include muons from pion, kaon decays and punch-through hadrons Muon average pT: ~2.5 GeV/c σ: 142 ps Total resolution: 142 ps Start resolution (start detector with TOF electronics readout): 81 ps Multiple scattering: 70 ps MTD intrinsic resolution: 94 ps From Lijuan Ruan’s talk at MTD review Sep. 17, 2010 STAR MTD workshop, USTC

  21. MTD Concept of Design 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) STAR MTD workshop, USTC

  22. Prototype of “real size” • “real size” module: active width ~ 52 cm • 12 strips: 3.8 cm wide, 87 cm long, 0.6 cm in between • Single stack: 6(5) × 0.25 mm gaps STAR MTD workshop, USTC

  23. Structure — side view 38 6 inner glass = 543 Licron electrode = 551 outer glass / honeycomb = 559 PC board = 580 inner glass = 874 Licron electrode = 882 outer glass / honeycomb = 890 PC board = 915 Gas gaps: Prototype I: 250μm × 6 Prototype II: 250μm × 5 STAR MTD workshop, USTC

  24. HV plateau of Prototype I (6 gaps) • The efficiency > 90% @ ±7300 V (Vth=30mV) • Time resolution ~ 90 ps without SF6 • SF6 is helpful for performance enhancement. STAR MTD workshop, USTC

  25. Charge spectrum@±7600V • With more SF6, less streamer achieved. no SF6 2% SF6 5% SF6 STAR MTD workshop, USTC

  26. Noise rate (Hz/strip) HV (+/-) LMRPC 10MΩ 0.5nF • With HV filter: • HV=±8000V, Vth=30mV (R134a:C4H10:SF6=93:5:2) • Equivalent to < 1.5 Hz/cm2, comparable to TOF MRPC STAR MTD workshop, USTC

  27. Prototype II with 5 gaps • Efficiency > 90% @± 6300 V • Time resolution comparable to Prototype I. STAR MTD workshop, USTC

  28. 3. Facilities for mass production • The same clean room as for STAR TOF with controlled temperature and humidity. • Two new desks for big module construction. STAR MTD workshop, USTC

  29. Electrode production • A separate room for glass cleaning and electrode spraying. • Clean the glass with hot steam and alcohol. • Graphite liquor will be used for painting the electrode. STAR MTD workshop, USTC

  30. Cosmic ray test system • A new cosmic ray system has been setup. • Trigger: 20 x 5 cm2 • T0: <50 ps • 16 TDC + 16 QDC • VME based DAQ • Gas: Freon + iso-C4H10 + SF6 STAR MTD workshop, USTC

  31. Manpower for production • 3 professors, 1 lecturer, 2 pos-doc, 1 engineer and 3 graduate students. • 2 technicians for module construction. • 1 technician for electrode painting. STAR MTD workshop, USTC

  32. 4. Summary • The first Long-strip MRPCs (10-gap) show very good performance and were successfully running at STAR from Run7 to Run10. • The cosmic ray test : • time resolution: around 70 ps; • detection efficiency: higher than 95%. • T963 beam test at FNAL: • spatial resolution: less than 1 cm. • time resolution and detection efficiency similar to cosmic test • Performance running at STAR: • Time resolution <100ps, spatial resolution ~2.5cm • The performances of both “real size” LMRPCs are good enough for the MTD requirements. • The facilities are ready. Mass production can start soon after the final design is confirmed. Thank You！ STAR MTD workshop, USTC

  33. STAR MTD workshop, USTC

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