HMPID offline status report ALICE Offline Week CERN

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HMPID offline status report ALICE Offline Week, CERN, 15 November 2010 D. Di Bari,

HMPID offline status report ALICE Offline Week, CERN, 15 November 2010 D. Di Bari, L. Molnar, G. Volpe

PLANNIG STATUS Quality assurance • Implementation of run type in QA 100% • Extract

PLANNIG STATUS Quality assurance • Implementation of run type in QA 100% • Extract QA data for large Monte Carlo production 100%? Documentation • Doc 50%

DA, Preprocessor, OCDB • DAs and Preprocessor running at P 2; • No changes

DA, Preprocessor, OCDB • DAs and Preprocessor running at P 2; • No changes foreseen; • OCDB: cut on track-mip distance in high flux event 1 cm - 6 cm

CALIBRATION STATUS Chamber gain (HV, P) HMPID calibration and condition parameters Freon (C 6

CALIBRATION STATUS Chamber gain (HV, P) HMPID calibration and condition parameters Freon (C 6 F 14) refractive index Cs. I quantum efficiency • No changes foreseen for HI

Code upgrade and new tools • Photon clusters charge distribution is important to study

Code upgrade and new tools • Photon clusters charge distribution is important to study the MWPC gain; • Photon clusters charge is now stored in the ESD friends. • HMPID task added to the QA train.

DQM QA shifter agent is in production at P 2 with 4 permanent summary

DQM QA shifter agent is in production at P 2 with 4 permanent summary plots; No change for HI, average quantities are the same (depends on trigger configuration); New addition: macro for DQM, set thresholds online, check the summary plots, visual aid for the DQM shifter.

DQM Flexible limit settings online (in macro), following the changes in the hardware: One

DQM Flexible limit settings online (in macro), following the changes in the hardware: One module is off, temporary “normal” situation for 1 day, but the data is correct in the rest; Fix limits can mask further problems → redefine limits To be done: Implement checks from macro in offline code Online limits to be propagated to offline

ALIGNMENT • Using 14 milions of events without magnetic field, HMPID alignment object have

ALIGNMENT • Using 14 milions of events without magnetic field, HMPID alignment object have been created and stored in the Alien OCDB; • LHC 10 b period data have been reconstructed (pass 2) applying the new alignment.

No mag. Field Local (Xtrk – Xmip)

No mag. Field Local (Xtrk – Xmip)

No mag. Field Local (Ytrk – Ymip)

No mag. Field Local (Ytrk – Ymip)

No mag. Field Local (Ytrk – Ymip)

No mag. Field Local (Ytrk – Ymip)

TRACK MATCHING PROBLEM • Strange results concerning uncorrected preliminary pbar/p ratio (≈ 1)! •

TRACK MATCHING PROBLEM • Strange results concerning uncorrected preliminary pbar/p ratio (≈ 1)! • Good tracks are selected cutting on extrapolated track – MIP cluster distance. • Residual have been considered separately for negative and positive tracks!

All momenta Local (Ytrk – Ymip) LHC 10 b

All momenta Local (Ytrk – Ymip) LHC 10 b

Local (Ytrk – Ymip) LHC 10 b

Local (Ytrk – Ymip) LHC 10 b

Local (Ytrk – Ymip) LHC 10 b

Local (Ytrk – Ymip) LHC 10 b

positive negative Polarity ++ LHC 10 b

positive negative Polarity ++ LHC 10 b

All momenta Local (Ytrk – Ymip) LHC 10 b

All momenta Local (Ytrk – Ymip) LHC 10 b

Local (Xtrk – Xmip) LHC 10 b

Local (Xtrk – Xmip) LHC 10 b

Local (Xtrk – Xmip) LHC 10 b

Local (Xtrk – Xmip) LHC 10 b

Local (Ytrk – Ymip) Montecarlo Residuals are centred at zero!!

Local (Ytrk – Ymip) Montecarlo Residuals are centred at zero!!

Pb-Pb events Local (Xtrk – Xmip) Polarity --

Pb-Pb events Local (Xtrk – Xmip) Polarity --

Pb-Pb events Local (Ytrk – Ymip) Polarity --

Pb-Pb events Local (Ytrk – Ymip) Polarity --

TRACK MATCHING PROBLEM • Positive and negative track local Y residuals are shifted depending

TRACK MATCHING PROBLEM • Positive and negative track local Y residuals are shifted depending on tracks momentum! • LHC 10 c period shows the same problem. • Shift disappear at high momenta. • The X residuals are ok (problem with alignment should affect also X residuals). • In Montecarlo data (with no disalignment) the tracking works well. No shifts are present.