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MRPC for STAR MTD upgrade

MRPC for STAR MTD upgrade. Yongjie Sun C enter of P article P hysics and T echnology U niversity of S cience and T echnology of C hina. Index. Introduction R&D on Long-strip MRPC Summary. 1. Muons: Penetrating Probes. A large area of muon telescope detector

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MRPC for STAR MTD upgrade

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  1. MRPC for STAR MTD upgrade Yongjie Sun Center of Particle Physics and Technology University of Science and Technology of China

  2. Index • Introduction • R&D on Long-strip MRPC • Summary STAR Regional Meeting, Ji'nan, China

  3. 1. Muons: Penetrating Probes • 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 Regional Meeting, Ji'nan, China

  4. 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 Regional Meeting, Ji'nan, China

  5. The success of MRPC for STAR TOF Muon Detector Time resolution <100ps Efficiency  90% High granularity STAR Regional Meeting, Ji'nan, China

  6. MRPC with Long Strips • The multiplicity of muon tracks is quite low • To save electronics channels • Read out at two ends • Mean time Eliminate the position along the strip • Time difference  Position information • Easy to build for large area coverage detector STAR Regional Meeting, Ji'nan, China

  7. 2. First prototype design 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 STAR Regional Meeting, Ji'nan, China

  8. Some photos STAR Regional Meeting, Ji'nan, China

  9. 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 Regional Meeting, Ji'nan, China

  10. 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 Regional Meeting, Ji'nan, China

  11. Cosmic ray test HV plateau STAR Regional Meeting, Ji'nan, China

  12. 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 Regional Meeting, Ji'nan, China

  13. Cosmic ray test T-A correction & Time resolution center of the strip T-A correlation One end of the strip STAR Regional Meeting, Ji'nan, China

  14. 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 Regional Meeting, Ji'nan, China

  15. FNAL Beam Test (T963) Efficiency plateau Time resolution STAR Regional Meeting, Ji'nan, China

  16. 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 Regional Meeting, Ji'nan, China

  17. Running in STAR Run 7 & Run 8 Run 9 & Run 10 STAR Regional Meeting, Ji'nan, China

  18. 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 Regional Meeting, Ji'nan, China

  19. 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 Regional Meeting, Ji'nan, China

  20. 3. Prototype of “real size” • “real size” module: active width ~ 52 cm • 12 strips: ~4 cm wide • Single stack: 6(5) × 0.25 mm gaps STAR Regional Meeting, Ji'nan, China

  21. 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 Regional Meeting, Ji'nan, China

  22. HV plateau of Prototype I (6 gaps) • Adding 2% of SF6 • Efficiency: little change • Time resolution: improved a lot • Quenching the streamer STAR Regional Meeting, Ji'nan, China

  23. Charge spectrum@±7600V • With more SF6, less streamer achieved. no SF6 2% SF6 5% SF6 STAR Regional Meeting, Ji'nan, China

  24. 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 Regional Meeting, Ji'nan, China

  25. Prototype II with 5 gaps • Efficiency > 90% over 6300 V • Time resolution comparable to Prototype I. (without SF6) • Electric field: 5-gap: 6-gap: STAR Regional Meeting, Ji'nan, China

  26. 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. • Current status: One has been shipped to UT and the other will be shipped out soon. Both to be installed in STAR and running in Run11. • The MTD MRPC mass production project has been approved by NSFC and will start from 2011. Thank You！ STAR Regional Meeting, Ji'nan, China

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