Frank Geurts Rice University

 TOF Timing ◦ HPTDC chip ◦ Calibration for HPTDC Non-Linearity  TOF Performance Monitoring ◦ Online Monitoring ◦ Prompt Analyses  TOF Offline Analysis ◦ Fast Offline QA ◦ Overall Layout ◦ Matching Algorithm ◦ Physics Production Chain and Calibration  TOF Offline resources/organization  Summary & Outlook April 26, 2009Hanghzou Workshop on STAR TOF2

 Timing based on CERN HPTDC chip  Operated in the Very High Resolution Mode: ◦ external clock input 40MHz  11bit coarse timing, 25ns ◦ internal Phased Lock Loop 8x 40MHz  3bit, 3.125ns ◦ internal Delay Locked Loop of 32 cells  5bit, 98ps ◦ internal 4 R-C delay lines  2bit, 24.4ps  21-bit timing information  8 MRPC channels per HPTDC chip ◦ 3 HPTDC chips per TDIG board ◦ 8TDIGs per TOF tray April 26, 2009Hanghzou Workshop on STAR TOF3 Coarse time (bin width 25ns, 11 bits) PLL bits (bin width 3.125ns) DLL bits (bin width 98 ps) MSB LSB R-C bits (bin width 24.4 ps) ★ ) High Performance Time to Digital Converter

 Timing based on Leading Edge (LE) MRPC signal ◦ set by a discriminator on the TINO board  Signal-height correction (slewing) based on Time-over-Threshold (ToT) ◦ measure the Trailing Edge (TE) of MRPC signal ◦ ToT is time difference between LE and TE; proportional to signal height; ◦ slewing correction based on offline calibration  see today’s presentation by Ming Shao  HPTDC has an intrinsic non-linearity ◦ due to e.g. process variation ◦ requires a per-channel calibration ◦ once determined, expect no changes April 26, 2009Hanghzou Workshop on STAR TOF4

 HPTDCs come with a three sources of non-linearity 1.unequal bin widths in RC-tapped delay lines 2.unequal bin widths in DLL 3.noise coupling from the logic network (40MHz) into the sampling clock network (320MHz)  Higher level tests show clock feedthrough (#3) dominates ◦ periodicity is 1024 bins (25ns) April 26, 2009Hanghzou Workshop on STAR TOF5 Bin number #entries Differential Non-Linearity (DNL): determine statistical bin width using a code density test: apply uniform random distribution w.r.t. TDC clock compare measured vs. expected #entries 1024

 INL correction determined for all TOF HPTDC channels  Full TOF Barrel: 120x192 = 23k TDC channels  1024 bins/channel at 2byte precision  Offline Database: 46Mbyte April 26, 2009Hanghzou Workshop on STAR TOF6 RMS RMS σ = ≈ 18ps INL applied no INL applied HPTDC integral non-linearity (INL): INL(n) = Σ i=1..n DNL(i), where DNL(i)= [N exp – N meas (i)] / N exp

 TOF Timing ◦ HPTDC chip ◦ Calibration for HPTDC Non-Linearity  TOF Performance Monitoring ◦ Online Monitoring ◦ Prompt Analyses  TOF Offline Analysis ◦ Fast Offline QA ◦ Overall Layout ◦ Matching Algorithm ◦ Physics Production Chain and Calibration  TOF Offline resources/organization  Summary & Outlook April 26, 2009Hanghzou Workshop on STAR TOF7

 Provides a fast check of the TOF system status ◦ occupancy/Dead channels ◦ correlation of East/West upVPD hits ◦ time information of TOF hits ◦ etc. etc.  Widely used during Run 8/9 ◦ 7 pages, 20 histograms ◦ new version will soon be deployed  includes data-integrity checks April 26, 2009Hanghzou Workshop on STAR TOF8 Embedded in the STAR Online Monitoring code

 Data integrity/consistency ◦ verify TOF consistency of TOF data headers ◦ see ◦ part of this can be moved to Online Monitoring  Dedicated noise runs ◦ dedicated TOF “pedestal” run (pedAsPhys_tof)  count #triggers in 5μs trigger-matching window at a ~3.5kHz STAR trigger rate ◦ prompt analysis of Leading and Trailing Edge noise rates for each MRPC channel ◦ see April 26, 2009Hanghzou Workshop on STAR TOF9 Run # Tray-19 Leading Edge noise

 TOF Timing ◦ HPTDC chip ◦ Calibration for HPTDC Non-Linearity  TOF Performance Monitoring ◦ Online Monitoring ◦ Prompt Analyses  TOF Offline Analysis ◦ Fast Offline QA ◦ Overall Layout ◦ Matching Algorithm ◦ Physics Production Chain and Calibration  TOF Offline resources/organization  Summary & Outlook April 26, 2009Hanghzou Workshop on STAR TOF10

 New offline DAQ reader based on RTSReader ◦ TOF data format specs v2.4 ★ ◦ implemented Run 8 April 26, 2009Hanghzou Workshop on STAR TOF11 StBTofHitMaker DAQ TOF Branch StBTofCollection: StBTofHeader StBTofRawHit StBTofHit StBTofCollection: StBTofHeader StBTofRawHit StBTofHit ◦ fiber data status and trigger time are stored in StBTofHeader ◦ leading-edge and trailing-edge values are stored in StBTofRawHit ◦ INL-corrected LE and TE values stored in StBTofHit ★ )

 event-wise hit distributions  matched hit distributions  channel-by-channel timing distributions ◦ requires fast-offline calibration by experts ◦ Vz from upVPD, TOF PID  Implemented in StEventQAMaker  During Run 8 and Run 9 (500GeV) QA by TOF experts  MatchMaker will soon be included in Fast Offline April 26, 2009Hanghzou Workshop on STAR TOF12 Offline DAQ Fast Offline Reconstruction EventQAMaker histograms QA by shift crew

April 26, 2009Hanghzou Workshop on STAR TOF13 STAR/TO F DAQ GSTAR geant hits GSTAR geant hits geometry (btofgeo) TOF Offline DAQ reader StBTofHitMaker TOF Offline DAQ reader StBTofHitMaker TOF Simulation Maker TOF Mixer Maker StBTofMatchMaker StBTofCalibMaker StEvent StBTofCollection StBTofRawHit StBtofHeader StBTofRawHit StBtofHeader StBTofHit StTrack StBTofPidTraits StMuBTofUtil StMuDstMaker StMuBTofUtil StMuDstMaker MuDst TOF StMcEvent StMcTofHit BTofRawHit BTofHit BTofHeader BTofRawHit BTofHit BTofHeader association DB Tables StBTofUtil StBTofPool DB Tables StBTofUtil StBTofPool

btofgeo.g and vpddgeo.g provide various TOF/VPD geometries: ◦ btofgeo.g -- btofConfigure ◦ vpddgeo.g -- vpddConfigure April 26, 2009Hanghzou Workshop on STAR TOF14 1Full CTBRun 1 2Full TOFp-- 325% TOFp +75% CTB-- 4TOFp +CTBRun 2 5TOFp+TOFr+CTBRun 3 6Full MRPC-TOFRun 9++ 7TOFp+TOFr’+CTBRun 4 8TOFr5+CTBRun 5 9-Run 6 10-Run TOFr8+CTBRun 8 1-6pVPDRun 2-5 7upVPDRun 6++

 p+p tof-tpx trigger data ◦ ~120k from run # ◦ ~45k good matched TPX tracks with TOF hits April 26, 2009Hanghzou Workshop on STAR TOF15 Expect to see a similar plot for Run-9 500GeV soon.

April 26, 2009Hanghzou Workshop on STAR TOF16 StEvent StBTofCollection StBTofHit Track Nodes (global) StBTofPidTraits Projected TOF Hits Fired TOF Hits Init Matched TOF Hits Singly-Tracked Matched Hits Final Matched TOF Hits Track projection on TOF Matching of hits within one pad distance Associate one TOF hit with multiple tracks One track with multiple TOF hits TOF Cell Index Timing Projected position Associated Track … and remove

April 26, 2009Hanghzou Workshop on STAR TOF17 StBTofHitMaker DB Tables StBTofUtil DB Tables StBTofUtil StBTofCalibMaker StBTofMatchMaker StMuDstMaker/StMuBTOFUtil STBTofNtupleMaker Trees for Calibration

 Active Tables (i.e. relevant to BTOF) April 26, 2009Hanghzou Workshop on STAR TOF18 tofConfigGeneral configuration for Barrel TOF tofTrayConfigTray Configuration tofTDIGOnTrayMapping of TDIG boards on trays tofDaqMapMapping between TDIG channels and TOF cells or upVPD tubes tofINLCorr/tofINLSCorrINL Correction table (channel-by-channel) tofPhaseOffsetPhase offsets between THUBs tofTOffsetCalibration table: T0 for each channel tofTotCorrCalibration table: T-Tot corrections tofZCorrCalibration table: T-Z corrections tofGeomAlignTray alignment parameters tofStatusTOF status table

 MuDST more compact than StEvent ◦ allows essential StEvent objects to be rebuild in memory  TOF branches in MuDst are filled by StMuDstMaker::fillBTof  TOF branches in MuDst ◦ structure StMuBTofHit  modified from StBTofHit using StMuBTofUtil::fillMuBTofHit ◦ structures StBtofRawHit, SBtTofHeader  direct copy from StBTofCollection  TOF PID traits in StMuTrack ◦ StMuTrack::muBTofPidTraits ◦ Structure: StMuBTofPidTraits: modified from StBTofPidTraits April 26, 2009Hanghzou Workshop on STAR TOF19

April 26, 2009Hanghzou Workshop on STAR TOF20 Run 9 (500GeV p+p): Fast-offline based production of 3.7M events finished

 TOF Timing ◦ HPTDC chip ◦ Calibration for HPTDC Non-Linearity  TOF Performance Monitoring ◦ Online Monitoring ◦ Prompt Analyses  TOF Offline Analysis ◦ Fast Offline QA ◦ Overall Layout ◦ Matching Algorithm ◦ Physics Production Chain and Calibration  TOF Offline resources/organization  Summary & Outlook April 26, 2009Hanghzou Workshop on STAR TOF21

 Online Plot:J.Liu  Offline QA:L.Li, M.Wada, X.Zhang, Y.Zhou  Calibration:Z.Tang, X.Zhang, J.Liu, X.Zhu, M.Shao L.Ruan  Chain Makers:X.Dong, F.Geurts  Geometry:W.Llope, X.Dong  Simulation:D.Thein, L.Ruan, F.Geurts  Database:X.Dong, F.Geurts  VPD:X.Zhang, J.Zhou, X.Zhu, Y.Xu  PID:C.Markert, M.Wada, L.Li  Coordinator: F.Geurts ◦ many thanks to X.Dong!  Institutes: BNL, LBNL, Rice, Tsinghua, USTC, UT Austin April 26, 2009Hanghzou Workshop on STAR TOF22

 weekly meetings ◦ Wednesday 1h30pm EST ◦ switch to EVO-based  widely in use in high-energy community  STAR community exists, too  get an account (  topical meetings ◦ as needed  early connection with PWGs ◦ include TOF-based PID ◦ efficiency (embedding) April 26, 2009Hanghzou Workshop on STAR TOF23

 TOF Offline Software is in a good shape ◦ Online Monitoring and FastOffline QA well integrated in STAR framework ◦ Migration to a new StEvent model is almost completed  STAR offline software review (Nov.’08) provided useful feedback ahead of Run 9  Decouple prototype software support and maintenance ◦ Matching and Calibration procedures/software have been tested for several years using the TOF prototypes ◦ Database tables are well maintained for offline analysis  Run-9: Efficiently handle the significant increase of channels that comes with a Large Area TOF ◦ jump from 4 to 75% of the full TOF ◦ optimized various aspects of the offline framework  database loading! April 26, 2009Hanghzou Workshop on STAR TOF24

 Continue Particle Identification method development - integrated with dE/dx  Simulator development  Efficiency ◦ Embedding and association  Include “start-less” TOF analysis ◦ relevant in low-energy runs where upVPD may not be very efficient  Connect early with STAR PWGs and have TOF PID included in many physics analyses April 26, 2009Hanghzou Workshop on STAR TOF25