T0 offline status Alla Maevskaya for T0 team ALICE offline week 6 July 2010

T0 offline statusT0 offline status

Alla Maevskaya Alla Maevskaya for T0 teamfor T0 team

ALICE offline weekALICE offline week6 July 20106 July 2010

OutlineOutline

What was new in T0 codeWhat was new in T0 code

Reconstruction Reconstruction LHC10bLHC10b LHC10cLHC10c recent runs reconstructionrecent runs reconstruction

QAQA

CalibrationCalibration

Alla Maevskaya ALICE offline week 6 July 2010

Some news about T0 code

Move L0/L1 trigger delays from AliRecoParam to OCDB;

Dummy SDigits were implemented;

Parameters of material optical properties defined for T0 did not work correctly with Geant4, fixed now (thanks to Alexei);

AliESDTZEROfriends were implemented but were not used yet;

AliT0Reconstructor was tuned for current data;

AliT0RawReader collects bunch ID from TRM header.


Physics runs April 2010Physics runs April 2010

During the April 2010 data During the April 2010 data taking:taking: ELMB switched off (not ELMB switched off (not possible to change the possible to change the thresholds and walk time for thresholds and walk time for CFDs)CFDs)Laser did not work so we could Laser did not work so we could not prepare time-amplitude not prepare time-amplitude calibrationscalibrationsBut:But:

Only events with LED-CFD Only events with LED-CFD amplitude > 540 were amplitude > 540 were reconstructedreconstructed

Early fired Early fired peakpeak


LHC10b Pass2, run LHC10b Pass2, run 115318115318

(T0A+T0C(T0A+T0C)/2)/2 T0AT0A

T0CT0C (T0A-(T0A-T0C)/2 T0C)/2 coorected coorected by SPD by SPD vertexvertex


LHC10b Pass2 run LHC10b Pass2 run 115318115318vertex resolutionvertex resolution

SPDvertex(Ncontributers>1)SPDvertex(Ncontributers>1)T0 vertexT0 vertexT0vertex in events without T0vertex in events without SPD vertex SPD vertex

SPDvertex – T0vertexSPDvertex – T0vertex


LHC10b : T0 resolution and efficiency

CINT1B-ABCE-NOPF-

ALL

CINT1B-CINT1B-ABCE-ABCE-

NOPF-ALL NOPF-ALL

CINT1B-CINT1B-ABCE-ABCE-

NOPF-ALL NOPF-ALL

SPD vertex SPD vertex with >1 with >1

contributrcontributreses

T0 – A 62% 76%T0 – C 59% 72%

T0 – OR 80% 99%T0 – AND 41% 50%


May10 - LHC10cFrom May 2010 data taking: ELMB switched on (new thresholds & walk times for CFDs)

Time-amplitude correction Time-amplitude correction graph prepared by graph prepared by Laser Calibration SystemLaser Calibration System


CDH and T0 bunch ID

Run 120244 Run 120824

Single_13b_8_8_8Single_13b_8_8_8Single_6b_3_3_3Good correlation


Problems with LHC10c runs: Problems with LHC10c runs: no correlation with SPD in the filling no correlation with SPD in the filling schemes Single_6b_3_3_3 and Single schemes Single_6b_3_3_3 and Single 13b_8_8_813b_8_8_8

T0 vertex – SPD T0 vertex – SPD vertexvertex

T0 vertex and SPD vertex

Run 120244Run 120244Single_6b_3_3Single_6b_3_3_3_3

Single 13b_8_8_8Single 13b_8_8_8run 120824run 120824

Only events with TRM BC Only events with TRM BC ID - CDH BC ID ==37 ID - CDH BC ID ==37 (diagonal )(diagonal )were chosen for were chosen for reconstructionreconstruction


alien:///alice/data/2010/LHC10d/000125078/raw/10000125078045.10.rootalien:///alice/data/2010/LHC10d/000125078/raw/10000125078045.20.root

Recent runs with filling Recent runs with filling scheme scheme Single_7b_4_4_4 run 125078 5 Single_7b_4_4_4 run 125078 5 JulyJuly


Recent runs with filling Recent runs with filling scheme scheme Single_7b_4_4_4 run Single_7b_4_4_4 run 125078125078

alien:///alice/data/2010/LHC10d/000125078/raw/alien:///alice/data/2010/LHC10d/000125078/raw/10000125078043.10.root10000125078043.10.rootalien:///alice/data/2010/LHC10d/000125078/raw/alien:///alice/data/2010/LHC10d/000125078/raw/10000125078043.20.root10000125078043.20.root

alien:///alice/data/2010/LHC10d/000125078/raw/alien:///alice/data/2010/LHC10d/000125078/raw/10000125078046.10.root10000125078046.10.rootalien:///alice/data/2010/LHC10d/000125078/raw/alien:///alice/data/2010/LHC10d/000125078/raw/10000125078046.20.root10000125078046.20.root


Good runs from T0 point of view

LHC10b and LHC10c

13

All LHC10bwith both filling scheme Single_2b_1_1_1 and Single_3b_2_2_2LHC10c- 900Gev runs7TeV: 118903 – 119163 filling scheme Single_2b_1_1_1

Bad runs: 119837 – 119862 due to TRM problemProblem runs:all runs 120064-end of LHC10c – filling schemes Single_6b_3_3_3 and Single_13b_8_8_8 without correlation with SPD vertex


Changes in T0 Changes in T0 reconstructionreconstruction

AliT0RawReader , storing TRM BC ID AliT0RawReader , storing TRM BC ID AliT0Reconstructor:AliT0Reconstructor:

only events with TRM BC ID – CDH BC only events with TRM BC ID – CDH BC ID ==37 (magic number, should be read ID ==37 (magic number, should be read from AliT0RecoParam) are to be from AliT0RecoParam) are to be reconstructed;reconstructed;time-amplitude calibration by QTC time-amplitude calibration by QTC amplitude will be used only for LCH10d amplitude will be used only for LCH10d ((and later on) dataand later on) data


QA: DQM shifter QA: DQM shifter histogramshistograms

During data taking laser During data taking laser calibration with given amplitude calibration with given amplitude will take place in big gaps between will take place in big gaps between bunches to check PMT and bunches to check PMT and electronicselectronics


QA RAWQA RAW

for DQM shifter

for us to be published in logbook

Coming soon


Calibration

DA T0Physda is running on T0 DAQ machine DA T0Physda is running on T0 DAQ machine during physics runs. It collects time shifts during physics runs. It collects time shifts between channels and T0 time for control clock between channels and T0 time for control clock shift. shift. DA T0Laserda running during set of runs DA T0Laserda running during set of runs “AMPLITUDE_CALIBRATION” and produces “AMPLITUDE_CALIBRATION” and produces data for time-amplitude calibration.data for time-amplitude calibration.But mostly data was not smooth and handmade But mostly data was not smooth and handmade treatment needed. treatment needed. I hope to solve this as soon as possibleI hope to solve this as soon as possible


Do be doneDo be done

Get online calibration data automaticallyGet online calibration data automatically

Implement pass0 calibration as AnalysisTask to Implement pass0 calibration as AnalysisTask to run after reconstructionrun after reconstruction

New set of DQM histogramsNew set of DQM histograms

AliT0Checker should be improved and colored in AliT0Checker should be improved and colored in “MUON” style“MUON” style

New OCDB object should be addedNew OCDB object should be added

New parameters should be added in New parameters should be added in AliT0RecoParamAliT0RecoParam


Back up slides

Chunk 45 Chunk 56

Chunk 57 Chunk 58

Run 120824 Single_13_8_8_8

Run 120244 Single_6b_3_3_3

Chunk 43Chunk 43 Chunk 45Chunk 45

Run 125078 5 July Single_7b_4_4_4Single_7b_4_4_4

10000125078043.2010000125078044

1000012507804610000125078045

Documents

T0 offline status Alla Maevskaya for T0 team ALICE offline week 6 July 2010