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Upgrade of electronics and corresponding calibration procedure for STAR time-of-flight detector

Upgrade of electronics and corresponding calibration procedure for STAR time-of-flight detector. Ming SHAO USTC. STAR physics program and TOF upgrade. Long term. Near term. TOF. ID-particle spectra freeze-outs hadronization ID-particle correlations In-medium jet

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Upgrade of electronics and corresponding calibration procedure for STAR time-of-flight detector

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  1. Upgrade of electronics and corresponding calibration procedure for STAR time-of-flight detector Ming SHAO USTC 10th particle physics conference

  2. STAR physics program and TOF upgrade Long term Near term TOF • ID-particle spectra • freeze-outs • hadronization • ID-particle correlations • In-medium jet • Fluctuations and correlations • Lepton program • In-medium vector meson • Heavy Flavor • Baseline detector for future upgrades • Thermometers: dilepton, photon • heavy quarkonium species. • jet fragments tagged by a hard direct photon, a heavy flavor • elliptic flow in U+U collisions. • LHC and GSI energies • fundamental QCD symmetries • v2 scaling for coalescence • jet quenching as parton energy loss • energy dependencetesting model prediction • Heavy flavor yields and flow:color screening and partonic collectivity • forwardjet correlation:CGC Near/Long Term: STAR white paper, Nucl. Phys. A 757 (2005) 102 10th particle physics conference

  3. What can we get from TOF (I) - Resonance decay /p misidentified as K Suppress background Rare particle searching Increase S/B, decrease data sample size 130GeV AuAu 10th particle physics conference

  4. What can we get from TOF (II) - Open charm - Fluctuation <pT> fluctuation 3 signal (D0+D0bar) 10th particle physics conference

  5. What can we get from TOF (III) - RHIC energy scan K+/+ v1, v2 v2 fluctuation, <pT> fluctuation … All benefit from a nearly complete direct PID 10th particle physics conference

  6. TPC- tracking pVPD - start time measurement MRPC TOF (TOFr) – stop time measurement Detectors -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 10th particle physics conference

  7. TOF system pVPD consists of plastic scintillator + fast PMT, 5.4m from TPC geometry center along the beam line 3 channels each side (run5 and before) upgrade to 19 channels each side (after run5) Full barrel TOF consists of 120 trays, 32 MRPC modules per tray, 6 channels (strips) per module Only one tray in run5 10th particle physics conference

  8. TOF Trays along years run5 run4 run3 Better mechanical design Simpler fabrication improved tolerance Optimized electronics 10th particle physics conference

  9. TOF DAQ Before run5 Run5 and later NIM local trigger based on pVPD signals CAMAC digitalization w.r.t local trigger I/O via PCI board and to STAR over network Slewing via ADC No local trigger HPTDC digitalization w.r.t clock (time stamps) I/O via SIU/RORC fiber directly to STAR Slewing via Time-Over-Threshold (TOT) 10th particle physics conference

  10. Tray Level Electronics 2 THUB per side, 4 total 1 TCPU per tray/pVPD, 122 total 1 TPMT/TDIS per pVPD, 2 total 8 TINO/TDIG per tray, 960 total 24 chn. per TINO/TDIG, 23040 total 10th particle physics conference

  11. LSB MSB PLL bits (bin width 3.125 ns) DLL bits (bin width 98 ps) R-C bits (bin width 24.4 ps) Coarse time(bin width 25 ns, 11 bits) HPTDC Time Measurement HPTDC is fed by a 40 MHz clock giving us a basic 25 ns period (coarse count). A PLL (Phase Locked Loop) deviceinside the chip does clock multiplication by a factor 8 (3 bits) to 320 MHz (3.125 ns period) . ADLL (Delay Locked Loop) done by 32 cells fed by the PLL clock acts as a 5 bit hit register for each PLL clock (98 ps width LSB = 3.125 ns/32). 4R-C delay lines divide each DLL bin in 4 parts (R-C interpolation) 10th particle physics conference

  12. Run5 Setup 10th particle physics conference

  13. Run5 Setup 10th particle physics conference

  14. Run5 Setup 10th particle physics conference

  15. Run5 Setup 10th particle physics conference

  16. Run5 Setup 10th particle physics conference

  17. Leading-edge discrimination : timing signal Trailing-edge discrimination: signal width (TOT) Amp. MRPC strip Thre. Readout T1lT2l T2tT1t time Time stamp TOF Calibration –run5 (and later on) Data sample (after TOF matching): ~8.4M from CuCu 62.4GeV, ~4.3M from CuCu 200GeV 10th particle physics conference

  18. Calibration procedure • Choose  sample by limiting dE/dx and momentum range (or pre-calibrated TOF) • Use spline fit (3rd polynomials TSplineFit based on ROOT developed by François-Xavier Gentit) • pVPD calibration (start time) • TOFr Cell_by_cell TOT and Z position calibration, using charged pion sample. • Iteration several times (if needed) 10th particle physics conference

  19. pVPD TOT Correction 10th particle physics conference

  20. TOT slewing pattern (I) Module: 1, 2, 3, 4 tof - texpect TOT (ns) 10th particle physics conference

  21. TOT slewing pattern (II) Module: 17, 18, 19, 20, 25, 26, 27, 28 tof - texpect TOT (ns) 10th particle physics conference

  22. TOT slewing pattern (III) Module: 5, 6, 7, 8, 21, 22, 23, 24, 29, 30, 31, 32 tof - texpect TOT (ns) 10th particle physics conference

  23. Hit position (Z) corrction 10th particle physics conference

  24. TOF Time Resolution CuCu 200GeV CuCu 62.4GeV 10th particle physics conference

  25. TOF Time Resolution Summary Run3 to run5 10th particle physics conference

  26. Hadron/electron/muon PID capability |1/β-1|<0.03 electrons Hadron PID: (, K) ~1.6 GeV/c , p ~ 3 GeV/c. STAR Collaboration, PLB 616 (2005) 8 Clean electron PID can be obtained up to PT< 3 GeV/c.  This is used to measure the semileptonic decay of open charm. STAR Collaboration, PRL94 (2005) 062301 Significantly reduce the systematic uncertainty on the charm cross section measurement. STAR Collaboration, PLB 639 (2006) 441 10th particle physics conference

  27. Physics from TOF (I) Cronin effect High pT /p STAR Collaboration: PLB 595 (2004) 143 PLB 616 (2005) 8 PLB 637 (2006) 161 PRL 97 (2006) 152301 PLB 655 (2007) 104 10th particle physics conference

  28. Physics from TOF (II) STAR Collaboration, PRL 94 (2005) 062301 STAR Collaboration, PLB 639 (2006) Open charm 10th particle physics conference

  29. Summary and outlook • New STAR-TOF electronics tested in recent physics runs. Technical details are verified, close to final design and waiting for production. • Calibration procedure re-newed according to electronics upgrade. Consistent performance , esp. time resolution of ~80ps, is obtained. • Rich physics from TOF, more in the future… • Coming soon • Half barrel TOF (60 trays) at run9 • Full barrel TOF (120 trays) at run10 • Fully commissioned at run11 10th particle physics conference

  30. BackupSlides 10th particle physics conference

  31. HPTDC Buffering & Readout 8 channel @ 25ps or 32 channels @ 100ps Level-0 Trigger Bunch Crossing Hit Buffer Level-0 Buffering 10th particle physics conference

  32. Front-End Electronics “TINO” ALICE NINO Chip 8 per tray 960 total 10th particle physics conference

  33. MRPC Digitizer “TDIG” 8 per tray 960 total 10th particle physics conference

  34. INL Correction • Sigma = 0.9 timebins = 22 ps • Implies single channel resolution of 16ps 10th particle physics conference

  35. Tray Controller “TCPU” 1 per tray 1 per Start Detector 122 total 10th particle physics conference

  36. DAQ/Trigger Interface “THUB” 2 per Detector side 4 total 10th particle physics conference

  37. PMT Input Board “TPMT” 1 per Start Detector 2 total 10th particle physics conference

  38. START Detector Digitizer “TDIS” 1 per Start Detector 2 total 10th particle physics conference

  39. Source Interface Unit Destination Interface Unit ALICE DDL Link Front-end electronics DDL SIU Detector Data Link Optical Fibre ~200 meters DDL DIU Read Out Receiver Card RORC PC Data Acquisition PC 10th particle physics conference

  40. Hadron PID 10th particle physics conference

  41. Electron PID 10th particle physics conference

  42. Muon PID 10th particle physics conference

  43. Run-VIII PID 1.2<p<1.4 GeV/c 10th particle physics conference

  44. Amp. Q1 Thre. Q2 T1T2 time Calibration Procedure – run4 Leading-edge trigger, signal charge (ADC) is measured for correction 10th particle physics conference

  45. pVPD Calibration –start time 10th particle physics conference

  46. TOFr Calibration –MRPC TA & TZ TA slewing correction Hit position (TZ) correction 7th-order polynomial 10th particle physics conference

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