TRD Status Christoph Blume presented by Dariusz Miskowiec

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

TRD Status l l l Alignment Calibration Tracking and PID Savannah entries Coverity

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 r z-tilt phi

r phi shift (cm) TRD supermodule alignment w. r. t. TPC, run 143237 SM 11. Survey: 1. 07 cm SM 15, 16. Survey: -0. 49, -0. 71 detector number

Online Calibration (Raphaelle) l PEDESTAL runs for noise and pad status l Where used? ¡ ¡ l Current issues: ¡ ¡ l During reconstruction in the clusterizer For MC data to be as close as possible to real data 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

Offline Pass 0 Calibration (Raphaelle, Julian) l Calibration of gain, drift velocity and time-offset l 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 pass 0 – Exclude chambers w/o data or too low gain or drift velocity – Chamber status already updated in OCDB for existing data l On the way: ¡ ¡ Determine gain factors independent of drift velocity Energy corrected by track angle (as already introduced for PID)

Other Calibrations (Raphaelle) l Done offline and then submitted to OCDB ¡ ¡ l Follow the discussion on calibration strategy ¡ ¡ l Alignment parameters Reference distributions for PID (based on V 0 analysis) 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 pass 0 macro (Ali. TRDcalib. C) for 2011

Calibration Monitoring l PWG 1 trains ¡ ¡ Uniformity of deposited energy over chambers Average pulse height in time bin direction histograms on http: //www-alice. gsi. de/trd/beam 10/ Ongoing improvements: – Mean and sigma of deposited energy – Better monitoring of the OCDB content – Residuals to check alignment l More advanced analysis ¡ ¡ Mean and sigma of 2 Ge. V/c pions identified via V 0 s as a function of run number Identified electrons/event with TOF+TRD(+TPC) as a function of run number

TRD – TOF Matching Problem l Savannah entry #75401 l TRD threshold was raised to 100 Ge. V/c ¡ l Low and high flux reco params modified Final fix is in v 4 -20 -Rev 16, being tested (Alexandru) ¡ threshold lowered to 0. 2 Ge. V/c! TRD starts updating ESD tracks

Performances: TOF Efficiency (Francesco)

New Tracking Approach (Alexandru) l Signal attachment ¡ ¡ l 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) l Reference point calculation Z (pad row crossing detection) ¡ ¡ see signal attachment robust

No TRD update @ 0. 2 Ge. V/c Performances: TRD tracklet-cand. -to-track resol. Alex Bercuci 12

Performances: TRD-tracklet-to-updated-track resol. 3/12/2021 Alex Bercuci 13

Changes in PID Method (Markus, Alexandru) l 1 D likelihoods from pp V 0 analysis l Charge calculation: ¡ ¡ old : d. Edx (radial dependence) now : Q (total charge)

Performances: TRD Tracking PID

Performances: TRD Tracking PID, pt=2 Ge. V/c

Savannah: Open Entries l #66092: Remove gstpar calls and put parameters in galice. cuts ¡ ¡ l 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 Ali. TRDQAData. Maker. Rec: : Init. Rec. Points() ¡ ¡ ¡ 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

Savannah: Open Entries l #66145: Very large memory allocation in TRD ¡ ¡ l Smaller object introduced (Frederick): Ali. TRDCal. DCSFEEv 2 Memory reduction ~ 40% (29 MB → 11 MB) 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)

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

Savannah: Open Entries l #78752: TRD request for porting to release ¡ ¡ l #78844: Request to port TRD DCS calibration code to Release ¡ l New TRD PID and tracking code Almost done Porting request following entry #66145: Very large memory allocation in TRD #79100: LHC 10 h 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 PWG 1 train

Coverity Defects l All defects in TRD directory finally removed