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MRPC R&D and production

MRPC R&D and production. Yongjie Sun Center of Particle Physics and Technology, USTC. Index. Introduction R&D on MRPC STAR TOF STAR MTD CBM TOF BES ETOF upgrade Summary. Introduction. MRPC.

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MRPC R&D and production

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  1. MRPC R&D and production Yongjie Sun Center of Particle Physics and Technology, USTC

  2. Index • Introduction • R&D on MRPC • STAR TOF • STAR MTD • CBM TOF • BES ETOF upgrade • Summary

  3. Introduction MRPC MRPC (Multi-gap Resistive Plate Chamber) is a major new detector technology first developed by the ALICE experiment. The concept first published on Nucl. Instr.& Meth. A374 (1996) 132 by M.C.S.Williams et al. • Advantages: • Time resolution • High efficiency • Low cost • Arbitrary readout shape Good candidate for large area Time-Of-Flight system !

  4. Early R&D (2000-2002) beam test at PS-T10, CERN：efficiency >95%（5 gas gaps） >97%（6 gas gaps ） ~ 99%（double stack 2  5 gas gaps ） time resolution ~70ps（ 5 gas gaps ） ~60ps（ 6 gas gaps ） ~50ps（double stack 2  5 gas gaps ） MRPCs of different structures working gas mixture: F134A(90%)＋iso- C4H10 (5%)＋SF6(5%) M.Shao, L.J.Ruan, H.F.Chen et al., NIM A492(2002)344-350 60

  5. TPC- tracking VPD - start time measurement MRPC TOF (TOFr) – stop time measurement STAR Upgrade -PID Particle momentum dE/dx ~8% resolution /K separation to ~0.6GeV/c k/p separation to ~1.0GeV/c Aim at 100ps time resolution TOF system /K separation to ~1.6GeV/c & k/p separation to ~3.0GeV/c

  6. MRPC Structure for STAR/TOF Module size： 21.2×9.4×1.79 cm3 Gas gap：6×0.22mm In 200 GeV central Au+Au: Time resolution <100ps Efficiency  90% High granularity Rate >200Hz/cm2 MRPC strip size： 3.15cm×6.30cm

  7. TOFr Tray Configuration Tray: • 6 in azimuth • 1 in pseudo-rapidity • radius ~ 2.2 m Total: • Area: 64 m2 • 3840 MRPC modules • ~23,000 channels

  8. STAR-TOF prototypesTOFrTray (1/120 coverage of Barrel STAR) Neighbor CTB Tray FEE EMC Rails Completed Prototype 28 module MRPC TOF Tray installed in STAR Oct. ‘ 02 in place of existing central trigger barrel tray   85 ps, 2 meter path 28MRPC, 24 made at USTC

  9. 2007 2008 2006 1/2 3/4 5/6 7/8 11/12 1/2 3/4 5/6 7/8 1/2 3/4 5/6 7/8 11/12 9/10 9/10 Prod. Start 40 MRPCs +192 MRPCs +326 MRPCs +326 MRPCs +326 MRPCs MRPC Mass Production • After STAR Construction Readiness Review in April 2006, MRPC mass Production in China started. • University of Sci. & Tech. of China (USTC) will produce 1210 MRPCs

  10. MRPC Mass production 100 m2 clean room ( cleanness class 100K ): Temperature： 25o C Humidity： <40% 4 assembly desk ( cleanness class 100 )

  11. MRPC mass production

  12. Mass Production QA/QC QA/QC on all materials, production procedure, and produced MRPC modules

  13. QA of materials glass PCB honeycomb supporter

  14. QC setup – cosmic ray telescope QC capability: 8 MRPCs / Day

  15. Monthly output Totally, 1283 MRPCs have been produced.

  16. Long time stability More stable at late production stage

  17. TOF Time Resolution Summary 2003 to 2009

  18. ~3cm ~6cm Long-strip MRPC STAR TOF ALICE TOF Long-strip readout: • save electronics channels. • Read out at two ends • Mean time Eliminate the position along the strip • Time difference  Position information

  19. MTD Possible applications • STAR MTD (Muon telescope Detector) • CBM TOF Wall (outer part)

  20. LMRPC Prototype-I Size: 950 x 256 mm2 Readout 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: 0.7 mm HV electrode: ~200 kΩ/□

  21. Photos of construction

  22. Cosmic ray test 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=±6.3 kV LMRPC

  23. Cosmic ray test results

  24. 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

  25. Beam Test results Time resolution Efficiency plateau Position resolution: ~ 1 cm 1/v ~ 60ps/cm

  26. Installed on STAR • Three such LMRPCs have been installed to STAR and successfully taken data since year 2007. • A STAR/MTD proposal was submitted based on these data.

  27. 25 mm 241mm 6 mm Readout strips 550 mm 2.5cm LMRPC prototype-II • Readout strips: 2.5 cm x 50 cm • Gaps between strips: 6 mm • Gas gaps: 10 x 0.25 mm, in 2 stacks • Glass: 0.7 mm • HV electrode: ~40MΩ/□

  28. Beam test @GSI Beam Test setup FOPI experiment Proton Beam Pb 6m 2m SSD PMT 1,2 42 cm THU MRPC PMT 3,4 SSD USTC MRPC y x Platform Platform Platform

  29. PMT Resolution ~67 ps T-(t1+t2+t3+t4)/4 T-(t1+t2+t3+t4)/4 ADC ((t3+t4)-(t1+t2))/4 <T-(t1+t2+t3+t4)/4> ADC T-(t1+t2+t3+t4)/4-f(A) MRPC Calibration MRPC time resolution ~ 67 ps @=±7 kV. (including momentum spread)

  30. Efficiency and resolution plateau 97% 67 ps

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

  32. Cross Talk Trigger on the strip center: “Cross talk” at neighbor strips: <~3% Trigger Area: 2 cm wide Valid TDCs and valid QDCs (3 sigma above pedestal) Valid TDCs

  33. Hits position profile on MRPC the profile is about 3cm x 2 cm the following analysis will base on these SSD position cuts and charge cuts

  34. Transverse profile—strip center

  35. 6mm-gap Transverse profile—strip edge

  36. Spatial resolution 1/v~ 60 ps/cm

  37. BES/ETOF upgrade • Current ETOF • muon: 110ps • Electron: 148ps • pion: 138ps(average 1.1GeV for 2 σ π/K separation, but varying is from 0.9 to 1.3 GeV) • MRPC ETOF • Not too affected by scattering • Total time resolution < 80ps • Non-intrinsic: ~ 50ps • MRPC: < 50ps • >1.4GeV for 2 σ π/K separation

  38. Design: 36 sectors with overlapping • The edges of MRPC are insensitive Overlapping • Space requirement of Front End Electronics 36 sectors instead of 48

  39. MRPC prototype design • 12strips, 2 ends read out • Length: 8.6-14.1 cm • Width: 2.5 cm • Gas gaps: 0.22 mm × 6 × 2 stacks • Module thickness:≤22 mm (without the gas box)

  40. photos of the assembly

  41. Summary • MRPC is successfully designed and mass produced for STAR TOF. The performance is uniform and stable, satisfied the STAR requirements. • Long-strip MRPC shows good performance: • Efficiency: > 97% • Time resolution: 60-70 ps • spatial resolution: less than 1 cm. • Cross talk: < 3% • MRPC for other applications is also considered. • Look forward to cooperate with NICA/MPD project. Thank you!

  42. 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

  43. 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)

  44. Valid TDCs and QDCs Cross TalkMRPC #2

  45. Efficiency vs. Position Valid TDCs HV=±7 kV

  46. Valid TDCs and valid QDCs (3 sigma above pedestal)

  47. Cross TalkMRPC #3

  48. Efficiency vs. Position Valid TDCs 7mm-gap between strips

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