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TOF offline status

TOF offline status. A. De Caro for the ALICE TOF Offline Group (University of Salerno and INFN). First cosmic muons through the ALICE detector. Some results obtained with the analysis of the data taken during the cosmic runs (12/07-09/08) with/without L3 magnetic field.

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TOF offline status

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  1. TOF offline status A. De Caro for the ALICE TOF Offline Group (University of Salerno and INFN)

  2. First cosmic muons through the ALICE detector Some results obtained with the analysis of the data taken during the cosmic runs (12/07-09/08) with/without L3 magnetic field.

  3. Analysis of the cosmic run data • During last summer, we worked to the analysis of the data taken during the cosmic runs and we updated the TOF code according to this analysis results. • After: • noise study, • correction of time measurements per cable delays, • correction of time measurements per some found offsets; • correction of the maximum distance-approach of a reconstructed tracks to a matchable TOF hit pad (one of the recoParams), we successful reconstructed some events. ALICE Offline Week

  4. Cosmic muon reconstructed in ALICE detector (B=0 T) TPC clusters TRD clusters TOF clusters t1<t2 Reconstructed track t1 Muon direction t2 ALICE Offline Week

  5. Prospective view ALICE Offline Week

  6. Cosmic muon reconstructed in ALICE detector (B=0.5 T) t1<t2 Muon direction t1 t2 - B = - |B| k ALICE Offline Week

  7. Prospective view - ALICE Offline Week A. De Caro 7

  8. First alignment studies To check the functionalities of the alignment algorithm with real events

  9. Distance-approach (r-z view) • First alignment step for the TOF detector: along the beam direction (z axis). • Distance-approach: the distance between the impact point of the reconstructed track on the TOF strip and the centre of the closer TOF cluster (schematically shown here). • The z component of the distance-approach is the parameter used to align TOF SMs along z axis. =371 cm Reconstructed track ALICE Offline Week

  10. Distance-approach distributions (B=0 T) -1- ALICE Offline Week

  11. Distance-approach distributions (B=0 T) -2- ALICE Offline Week

  12. Distance-approach distributions (B=0 T):aligned geometry -1- ALICE Offline Week

  13. Distance-approach distributions (B=0 T):aligned geometry -2- ALICE Offline Week

  14. Distance-approach vs strip per TOF SM (B=0 T) TPC: field cage internal wall ALICE Offline Week

  15. Distance-approach vs strip per TOF SM (B=0.5 T) TPC: field cage internal wall Caused by a not corrected calibration for the drift velocity (TPC people confirmed). ALICE Offline Week

  16. I would like to understand why I didn’t receive answer… Email on 12/09/08 @ Marian.Ivanov: do you know how often it is necessary to update the TPC reco parameters (gain factor, as example)? Email on 07/10/08 @ Marian.Ivanov and email on 08/10/08 @ Marek.Kowalski (who forwarded this email to Marian.Ivanov): …I noted also that there was a 'strange' trend for DeltaZparamenter, that is the distance along the beam direction between the reconstructed track and the matched TOF sensitive element. In particular, I can see the following trend: | DeltaZ | ~ a * z + b where a and b parameters assume different values for z<0 and z>0 (practically, at z=0, there is an offset between the two lines found for z>0 and z<0). Maybe you find similar results... For this I am sending you this email. I hope you can give me more details about. ALICE Offline Week

  17. Alignment requirements OK To be checked Geometry overlaps in the following cases: Ideal misalignment Residual misalignment Full misalignment TOF survey alignment object: we have one of them only recently inserted in the DCDB but we have to check the code with this object. See next slide ALICE Offline Week

  18. FSTR/FTLA and FSTR/FLTC extrusions ALICE Offline Week

  19. FSTR/FTLA and FSTR/FLTC extrusions FTSR67 FTSR25 FTSR29 FTSR63 ALICE Offline Week

  20. The end

  21. Backup

  22. ESD track selection conditions SM1 0cm<y0<65cm 10°<f<30° SM0 -65cm<y0<0cm 10°<f<30° SM10 SM9 -65cm<y0<0cm 150°<f<180° SM7 SM8 SM17 0cm<y0<65cm 150°<f<180° SM16 ALICE Offline Week

  23. TOFforTRD trigger SM7&&SM17 SM1&&SM9 SM8&&SM16 SM0&&SM10 E. Scapparone, Physics Forum, 2nd July 2008 ALICE Offline Week

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