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TRD Status

Detailed outline of offline and online tasks completed, calibration updates, trigger simulation progress, geometry adjustments, and project planning for the TRD system. Includes revision of raw data, improvement in digitizer performance, and enhancements in clusterizer speed.

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TRD Status

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  1. TRD Status Christoph Blume Offline Week, March, 2009

  2. Outline • Raw data • Digitizer and clusterizer • Status calibration • Trigger simulation • Geometry • Project planner • Reconstruction  Alexandru (Thu.)

  3. Raw Data • Revision of raw data simulation (W. Park) • Remove split between simulated and real raw data • Bug fixes • Already in 4-16-Release • Raw data decoding • Speed optimization for HLT requirements ongoing (M. Kweon, T. Rascanu) • Reading of online tracklets Before: After:

  4. Digitizer • New data structures for digits (H. Leon Vargas) • Simplified and smaller structures • Faster data access • ZS moved from raw data streamer to digitizer  digits consistent with raw data File size: TRD.Digits.root CPU time: Digitization

  5. Clusterizer • Clusterizer has been revised (T. Rascanu) • Original motivation: Speed for HLT • Everything is done inside on loop • Fewer data structures and copying of data involved • Initializations via memset • Streamlining of data reading part • Bug fixes • Same algorithm used in HLT • Can now run at 100Hz • Further improvements in raw data handling

  6. Online Calibration • DAs and preprocessor status • Procedures are ready and operational • DCS datapoints • One has been removed (ADC clock phase) • Calibration object status • Pretrigger and GTU information to be added in TRD/Calib/DCS/AliTRDCalDCS • Will use same infrastructure as implemented to read FEE configuration (fxsproxy, F. Kramer) • Awaiting final definition of contents by experts

  7. Offline Calibration (LHC08d Period) • Gain calibration (offline) • Sum of dE/dx of all clusters attached to a TRD tracklet (no vD calibration yet) • vD and t0 calibration • Offline: vD from amp. peak and t0 from slope at end • Comparison to online results (R. Bailhache)

  8. TRD L1 Trigger Simulation • TRD L1 Trigger consists of two components • Local tracklet finder • Finds short tracklets inside single chamber • Implementes in Tracklet Processor (TRAP) chip • Global Tracking Unit (GTU) • Connects tracklets from several layer to global track • Assigns pt and e-PID • L1 trigger decision (High-pt electrons, , jets)

  9. Tracklet Processor (TRAP) Simulation • AliTRDmcmSim • Simulation of online (hardware) algorithm AliTRDtrapAlu • AliTRDmcmTracklets • Hit detection (3 pads) • Filling fit registers (fit sums) • Calculation of linear fit • Revised version in SVN (J. Klein) • AliTRAPConfig • Other functionalities: • Zero suppression • Digital filters (pedestal, gain, tails)

  10. Global Tracking Unit (GTU) Simulation • Simulation of GTU • Simulates L1 tracking algorithm as done online by FEE • Needed for offline test of trigger algorithms and efficiency evaluation • Input: simulated LTU tracklets • Implementation • AliTRDgtuSim (J. Klein) • Output • AliTRDgtuTracklet • General tracklet base class: AliTRDtracklet

  11. Geometry and Overlaps • Misalignment w/o creating overlaps currently not possible • Position smearing with truncation implemented • Requires quite strong truncations • Some principle problems in current geometry implementation • Envelope volume of single chamber, defining alignable volume • Probably redesign required • Currently being investigated

  12. ESDs • Number of time slices for PID (A. Wilk) • Switch to 8 as default as needed for NN • Tests by Alex: 1060Bytes/ESDtrack on average • Now accepted and implemented

  13. Finished Tasks Since Last Offline Week • Update of raw data simulation (31/10/08) • Decoding trap configuration in readout tree (31/10/08) • Consistent treatment of ZS in digitizer (30/10/08)

  14. Project Planner

  15. Alignment and Geometry • Alignment exercise with cosmics • Uses cosmics data taken in lab (D. Miskowiec talk on offline week last June) • Survey data • Will be analysed to determine alignable objects • However: Not supposed to be used for reconstruction (survey done from A-side only, anyway) • Can be possibly compared to alignment results from cosmics events taken @ P2 (matter of statistics)

  16. F. Kramer

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