T0 offline status Alla Maevskaya for T0 team 8 March 2011 ALICE offline week.

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Presentation transcript:

T0 offline status Alla Maevskaya for T0 team 8 March 2011 ALICE offline week

Outline Results of LHC10h Calibration in 2010 Calibration strategy and QA for 2011

Results of LHC10h pass1 Results of LHC10h pass1 T0 efficiency Run

Calibration for LHC10h pass1 Slewing correction - laser calibration; online DA: chain of runs with given amplitude Equalizing channels - online DA Season time shift correction :  from GRP  manually after pass1 of yesterday runs analysis

1. We calibrate : online: * time offset between channels during data taking; * time slewing correction during chain of laser runs with given amplitude called AMPLITUDE_CALIBRATION ; offline: * time offset between channels with slewing corrections taken into account; * time offset due to LHC clock phase and season time shift. 2. Not, but T0 reconstruction depends on ITS vertex ITS 3. If we are doing time slewing correction using laser calibration data 10% of statistics is enough. 4. Resolution of T0 time is the main estimate of calibration quality. Width of the resolution trend during run period could be used as an uncertainty estimation. PWG1CalibrationStrategy#Answers_from_T0

Calibration for LHC10h pass2 Slewing correction by data: time-amplitude dependencies for each PMT were collected for some runs and fit. They look like this:

Slewing correction for pass2 Beforeafter Methos : 2D histograms were slices and each slice was fit by gaus. Error bars are sigmas of fit

Results LHC10h pass2 Only signals CFDi_mean channels Only signals with amplitude 1-80MIPs were participated in competition who was 1st Slewing correction was done according physics data time-amplitude dependence Run T0 resolution = 26ps; T0A, T0C and T0AC are centered in 0

Event multiplicity dependence Run pass1 Run pass2 Run pass2 Run pass2

Calibration strategy for 2011 Before data taking: amplitude calibration and slewing correction from chain of laser runs During physics run by DA: time offset between channels and CFD peak position Pass0 : * time offset between channels with slewing corrections taken into account; * rough time offset due to LHC clock phase and season time shift. To be check after pass0: exactly the same CFD peak position for each PMT; exactly the same CFD peak position for each PMT; no time -amplitude dependence. Rewrite OCDB entry T0/Calib/TimeDelay Fill OCDB entry T0/Calib/TimeAdjust After pass1 reconstruction the same calibration as Pass0 should be repeat and rewrite OCDB entries. To be check: exactly the same CFD peak position for each PMT; exactly the same CFD peak position for each PMT; no time -amplitude dependence ; no time -amplitude dependence ; all T0s are centered in 0; all T0s are centered in 0; T0 resolution T0 resolution

Summary T0 results were not bad for LHC10h but we still have to understand T0 dependence on event multiplicity All hand-made calibration should be replaced by automatic procedure T0 wagons for calibration train and PWG1 QA trains should be tested and will be ready in 2 weeks.