1 / 23

ITS code Status June 7 2002

ITS code Status June 7 2002. A. Badala’, R. Barbera, B. Batyunya, Y. Belikov, M. Bondila , N. Bustreo , R. Caliandro ,P. Cerello, E. Crescio , R. Fini, E. Fragiacomo, J. Hubbel , E. Lopez, G. Lo Re , B. S. Nilsen, G. S. Pappalardo, W. Peryt, A. Pulvirenti , S. Radomski ,

aulii
Download Presentation

ITS code Status June 7 2002

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ITS code StatusJune 7 2002 A. Badala’, R. Barbera, B. Batyunya, Y. Belikov, M. Bondila, N. Bustreo, R. Caliandro,P. Cerello, E. Crescio, R. Fini, E. Fragiacomo, J. Hubbel, E. Lopez, G. Lo Re, B. S. Nilsen, G. S. Pappalardo, W. Peryt, A. Pulvirenti, S. Radomski, T. C. Randles, F. Riggi, P. Skowronski, R. Turrisi, L. Vannucci, T. Virgili

  2. Outline • Geometry • SPD • SDD • SSD • General AliRoot status. Alice-ITS week Review June 7 2002

  3. Results of GeometryReview • SPD: only briefly looked at. • SDD: Geometry old but ok. • SSD: Missing two Front end cards, end ladder elements, wrong Al cooling tubes, and kapton cables. Otherwise old geometry. • End caps and services: Old course geometry otherwise ok. Alice-ITS week Review June 7 2002

  4. Sensitive Si Material -rays on, Ecut=70KeV , Brems Ecut=70KeV , Hadron Ecut=1MeV None Sensitive Materials (Default Settings) -rays off All Ecut=1.0MeV For All Materials -rays on, Ecut=30KeV -rays on, Ecut=30KeV  Ecut=1.0MeV Hadrons Ecut=30KeV Beam Pipe parameter no longer default but set like ITS. Changes to GeantParameters Pre-March 2002 As of June 2002 Alice-ITS week Review June 7 2002

  5. Sensitive Si: Step < 1cm /step < 1.0º Edep/Eparticl< 30 Volume Boundary location precision 1cm Centeral barrel: Step < 1cm /step < 1.0º Edep/Eparticl< 30 Volume Boundary location precision 1cm Sensitive Si: Step < 75m /step < 0.1º Edep/Eparticl< 0.1 Volume Boundary location precision 1m Centeral barrel: Step < 0.1cm /step < 0.1º Edep/Eparticl< 0.1 Volume Boundary location precision 1 m Geantes to GeantParameters cont. Pre-March 2002 As of June 2002 Alice-ITS week Review June 7 2002

  6. Air: Step < 1cm /step < 1.0º Edep/Eparticl< 0.003 Volume Boundary location precision 1cm Services: Step < 0.01cm /step < 10.0º Edep/Eparticl< 0.003 Volume Boundary location precision 0.003cm Air: Step < 1cm /step < 0.1º Edep/Eparticl< 0.1 Volume Boundary location precision 1m Services: Step < 1cm /step < 1.0º Edep/Eparticl< 0.5 Volume Boundary location precision 10 m Geantes to GeantParameters cont. Pre-March 2002 As of June 2002 Alice-ITS week Review June 7 2002

  7. Changes to Infrastructure • Old: • Hits  Digits  RecPoints  Tracks • Use Macros, works only for ITS, not in conjunction with other detectors. • All new data appended to end of initial galice.root file. • New: • Hits  SDigits  Digits  Tracks  PID • SDigits-0 + SDigits-1  Merging  Digits • Added Region of interest cut to Merging. • Merging done using a TTask, and others coming. • Hits  SDigits  Digits can be done for all detectors at one time (or soon will be). • Hits, SDigits, Digits, and RecPoints can be in different files. Alice-ITS week Review June 7 2002

  8. General ITS Comments • Fast-Point simulation getting more use than expected. • We still need to improve, write, documentation. • Test Macros and the like are still not being developed and disseminated. • We need to develop better simulations of Test Beam setups, so that we can make even better comparisons with our simulations. • ITS Algorithm Review was missed. Needs to be rescheduled and presentations need improvement. Alice-ITS week Review June 7 2002

  9. SPD related studies • Multiplicity Measurement studies. • Pseudorapidity distribution studies. • Vertex Reconstruction Studies. • SPD based Trigger studies. • SPD-ZDC Correlation studies. • SPD Occupancy studies. • SPD noise studies. • Still have Two available SPD simulations • Bari-Salerno Model (Default). • Dubna Model. Alice-ITS week Review June 7 2002

  10. Remaining SPDProblems • The Bari-Salerno model (FORTRAN version) is used by NA57. • The number of single pixel clusters simulated is more than seen in the Test Beam data. • The number of 2 and more wide pixels are greatly under predicted. Bari-Salerno Dubna Test Beam Alice-ITS week Review June 7 2002

  11. Remaining SPDProblems cont. • Adjusting parameter of the Dubna model can compensate a bit, but leads to unphysical diffusion parameters. • Changes to the Bari-Salerno model would require similarly unphysical asymmetric coupling parameters. Bari-Salerno Dubna Test Beam Alice-ITS week Review June 7 2002

  12. SDDActivities • Much work to try to speed up SDD detector simulation or at least move the slowest parts to SDigit creation. Based on 3 p-p events Alice-ITS week Review June 7 2002

  13. SDD Timings • The source of the slower SDD simulations are due to the need to have time correlated noise and so consequently use a FFT. • The TPC, also should have time correlated noise, but have not implemented it yet. At present they are using Random Gaussian noise. Alice-ITS week Review June 7 2002

  14. 1.2 294 um pitch detector Reconstruction Efficiency 1.1 1 0.9 0.8 Beam Test Data Beam Test Simulation 0.7 0.6 0 5 10 15 20 25 30 35 Drift Path (mm) 100 100 294 um pitch detector 294 um pitch detector Anode Resolution Time Resolution 80 80 Beam Test Data (Anode) Beam Test Data (Time) Beam Test Simulation (Anode) Beam Test Simulation (Time) 60 60 40 40 20 20 0 0 0 5 10 15 20 25 30 35 0 5 10 15 20 25 30 35 Drift Path (mm) Drift Path (mm) SDD and Test Beams • Some minor discrepancies in Anode resolution. • A systematic discrepancy in Time resolution, may be due to a jittery start pulse in the Test Beam. Alice-ITS week Review June 7 2002

  15. SDD Parameters Based on experimental values: Drift velocity 7.3 m/ns Diffusion constant 3.2 m2/ns Initial size of the cloud 30. m Baseline 20 ADC cnts Noise after electronic 2.38 ADC cnts Noise 10 Maximum ADC value 1024 ADC cnts Time Jitter Error 20. m ADC sample frequency 40. MHz Alice-ITS week Review June 7 2002

  16. SSD Remaining problems • SSD Reconstruction needs review. • Piort Skowronski’s reconstruction need additional comments, to allow it to be maintained, and have it’s parameters reviewed. • Alternative Ghost and overlaping tracks algorithm needs to be investigated. • Ghost removal by tracking needs to be implemented. Alice-ITS week Review June 7 2002

  17. SSD Remaining problemscont. • SSD Digit-ADC histogram has unexpected shape. • See http://www.ts.infn.it/~efragiac/doublepeak/doublepeak.html and http://AliSoft.cern.ch/people/masera/ssd/ B=0.2T, old settings Mip peak Digit ADC Alice-ITS week Review June 7 2002

  18. Study Continues No Noise No Coupling B=0.2T B=0.4T B=0T Digit ADC Digit ADC Just charge sharing. Also seen in SDigits. Digit ADC Alice-ITS week Review June 7 2002

  19. Continue B=0.4 2 Strip Clusters 1 Strip Clusters 3 Strip Clusters Digit ADC Digit ADC Digit ADC 4 Strip Clusters 5 Strip Clusters 6 Strip Clusters Alice-ITS week Review June 7 2002 Digit ADC Digit ADC Digit ADC

  20. Continue B=0 1 Strip Clusters 2 Strip Clusters 3 Strip Clusters Digit ADC Digit ADC Digit ADC 4 Strip Clusters 5 Strip Clusters 6 Strip Clusters Alice-ITS week Review June 7 2002 Digit ADC Digit ADC Digit ADC

  21. NA57 Strip DataB=0 Alice-ITS week Review June 7 2002

  22. NA57 DataB=1.6T Alice-ITS week Review June 7 2002

  23. General AliRootStatus • Production runs to produce Hits done in Fall 2001 and Winter 2002, more scheduled. • Big push to get all detectors producing SDigits, Digits, and RecPoints, within the same AliRoot section. • New high level data structures, use of TFolders. • SDigit merging and writing SDigits, Digits, and RecPoints into separate files. Alice-ITS week Review June 7 2002

More Related