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TRD Status

TRD Status. Christoph Blume presented by: Dariusz Miskowiec Offline Week, March, 2011. TRD Status. Alignment Calibration Tracking and PID Savannah entries Coverity. TRD survey in January 2011. SM phi-shift z-shift r-shift z-tilt -------------------------------------------

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TRD Status

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  1. TRD Status Christoph Blume presented by: Dariusz Miskowiec Offline Week, March, 2011

  2. TRD Status • Alignment • Calibration • Tracking and PID • Savannah entries • Coverity

  3. TRD survey in January 2011 SM phi-shift z-shift r-shift z-tilt ------------------------------------------- 00 -1.49(10) -1.31(10) -0.03(10) -0.33(13) 01 -1.41(10) -1.43(10) -0.17(10) -0.33(13) 02 03 04 05 06 07 0.38(10) -0.62(10) -1.21(12) 0.10(15) 08 0.69(9) -1.62(8)-1.56(8) -0.14(11) 09 0.88(9) 0.10(8) -0.77(8) 0.17(11) 10 1.22(10) 1.35(10) -0.66(12) -0.14(15) 11 1.07(16) 0.46(10) -0.16(10) 0.13(19) 12 13 14 15 -0.49(16) -0.95(10) 0.04(10) -0.15(19) 16 -0.81(9) -1.12(8) 0.56(8) -0.31(11) 17 -1.15(9) -0.88(8) 0.28(8) -0.01(11) Only A-side measured Results translated into shifts/tilts Only shifts and z-tilt allowed Shifts in cm, tilts in degrees 20 x z-tilt r phi

  4. TRD supermodule alignment w.r.t. TPC, run 143237 SM 11. Survey: 1.07 cm r phi shift (cm) SM 15,16. Survey: -0.49, -0.71 detector number

  5. Online Calibration (Raphaelle) • PEDESTAL runs for noise and pad status • Where used? • During reconstruction in the clusterizer • For MC data to be as close as possible to real data • Current issues: • Ongoing changes due to modified LDC setup for TRD • Difficulties in sending data to AMORE • Nevertheless a noise picture of newly installed sectors is already available

  6. Offline Pass0 Calibration (Raphaelle, Julian) • Calibration of gain, drift velocity and time-offset • Current issues: • Thanks to Peter and Jacek: bug fixed in TRD calibration code • Calibration of chamber status: tested in Pb+Pb but not yet activated for pass0 • Exclude chambers w/o data or too low gain or drift velocity • Chamber status already updated in OCDB for existing data • On the way: • Determine gain factors independent of drift velocity • Energy corrected by track angle (as already introduced for PID)

  7. Other Calibrations (Raphaelle) • Done offline and then submitted to OCDB • Alignment parameters • Reference distributions for PID (based on V0 analysis) • Follow the discussion on calibration strategy • Answers on TWiki page provided • Participation in ESDfix requested (PID resp. calibration) • Current issue: • As soon as the minimum bias trigger strings for next pp data taking are known we have to check/update the pass0 macro (AliTRDcalib.C) for 2011

  8. Calibration Monitoring • PWG1 trains • Uniformity of deposited energy over chambers • Average pulse height in time bin direction • histograms on http://www-alice.gsi.de/trd/beam10/ • Ongoing improvements: • Mean and sigma of deposited energy • Better monitoring of the OCDB content • Residuals to check alignment • More advanced analysis • Mean and sigma of 2 GeV/c pions identified via V0s as a function of run number • Identified electrons/event with TOF+TRD(+TPC) as a function of run number

  9. TRD – TOF Matching Problem • Savannah entry #75401 • TRD threshold was raised to 100 GeV/c • Low and high flux reco params modified • Final fix is in v4-20-Rev-16, being tested (Alexandru) • threshold lowered to 0.2 GeV/c! TRD starts updating ESD tracks

  10. Performances: TOF Efficiency (Francesco)

  11. New Tracking Approach (Alexandru) • Signal attachment • old : clusters (closest to track projection) • new : segment (fittest to track) • Reference point calculation Y • old : linear tracklet fit • new : robust tracklet fit (outliers rejection) • Reference point calculation Z (pad row crossing detection) • see signal attachment • robust

  12. Performances: TRD tracklet-cand.-to-track resol. TRD update @ 0.2GeV/c No TRD update Alex Bercuci 12

  13. Performances: TRD-tracklet-to-updated-track resol. 6 January 2020 Alex Bercuci 13

  14. Changes in PID Method (Markus, Alexandru) • 1D likelihoods from pp V0 analysis • Charge calculation: • old : dEdx (radial dependence) • now : Q (total charge)

  15. Performances: TRD Tracking PID

  16. Performances: TRD Tracking PID, pt=2 GeV/c

  17. Savannah: Open Entries • #66092: Remove gstpar calls and put parameters in galice.cuts • galice.cuts need extension to include also STRA • Modifications to galice.cuts prepared (see Savannah entry) and need to be submitted before final change of TRD code • #66144: Very large memory allocation in AliTRDQADataMakerRec::InitRecPoints() • Right now needed for chamber-by-chamber analysis • Could be moved to sector-by-sector analysis, if needed. • If not, the entry should be closed

  18. Savannah: Open Entries • #66145: Very large memory allocation in TRD • Smaller object introduced (Frederick): AliTRDCalDCSFEEv2 • Memory reduction ~ 40% (29MB → 11MB) • Backward compatibility tested • Being ported to release and ready to be closed • #68107: Steep efficiency drop for SA tracker after rev 41167 • Needs the error parameterization to be finalized • Ongoing work (Alexandru)

  19. Savannah: Open Entries •  #75399 Check TRD overlaps with full/residual misalignment • Still to be done (Christoph) • #75401: Problem in TOF matching in TRD sector • See previous slides on tracking • #77321: Request to store friends for TRD-triggered events • Status ????

  20. Savannah: Open Entries • #78752: TRD request for porting to release • New TRD PID and tracking code • Almost done • #78844: Request to port TRD DCS calibration code to Release • Porting request following entry #66145: Very large memory allocation in TRD • #79100: LHC10h reconstruction macro: alignment data and "friends” TRD needs friends for • detailed studies of TRD response for high-pt tracks • calibrations requiring high-statistics (pad response function, error param.) • improving the run-by-run calibration of runs for which the calibration procedure failed for some reason • QA via PWG1 train

  21. Coverity Defects • All defects in TRD directory finally removed

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