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T0 offline status

Alla Maevskaya for T0 group INR RAS Moscow 8 April 2008 ALICE offline week. T0 offline status. Outline. T0 commissioning status test February/March 2008 calibration & reconstruction of runs collected during test QA Plans.

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T0 offline status

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  1. Alla Maevskaya for T0 group INR RAS Moscow 8 April 2008 ALICE offline week T0 offline status

  2. Outline • T0 commissioning status • test February/March 2008 • calibration & reconstruction of runs collected during test • QA • Plans Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  3. T0 T0-A T0-C z-position(cm) -350 +70 h - coverage 4.5 to 5.0 -2.9 to -3.3 # of channels 12 12 Active area(cm2) 84.78 84.78 Time resolution 37ps 37ps V0C V0A IP RB26 RB24 T0 detector T0-A T0-C T0-C Tatiana Karavicheva INR RAS CERN 1/04/ 2008

  4. T0-C Installed (April 2007) Tested with laser without magnetic field (December 2007) Tested with L3 powered on 0.5 T (February 2008) All hardware Installed (November 2007) Tatiana Karavicheva INR RAS CERN 1/04/ 2008

  5. T0-A Installed (February 2008) Tested with laser with and without magnetic field (February 2008) All hardware Installed (January 2008) Tatiana Karavicheva INR RAS CERN 1/04/ 2008

  6. Configuration of Hardware during the February 2008 Run T0-C & T0-A detector (24 modules) Fast electronics (final version, apart from G&P generator module ) Readout electronics (final version) Trigger electronics (final version) HV / LV (final version) LV (for readout crate) Laser system (final version) Tatiana Karavicheva INR RAS CERN 1/04/ 2008

  7. DCS/ECS/Trigger • T0 detector integrated in ALICE DCS/ECS/Trigger • Global and standalone modes were used • All trigger modes (toggle, signature, normal, random) were tested at P2 with CTP • During global run not used as trigger detector (from laser) Tatiana Karavicheva INR RAS CERN 1/04/ 2008

  8. Test Februrary/March 08 No data in GLOBAL runs A lot of STANDALONE laser runs Calibration data was collected by DA and written in OCBD by Preprocessor. RAW and OCDB data registered in Alien MOOD monitoring Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  9. DA, Preprocessor • Two DAs: T0Physda.cxx – equalizing channels T0Laserda.cxx – walk correction • Both set and configured on the monitoring machine • Takes an input parameters file from DAQDB (going to be changed before next cosmic run)‏ • Sends an output file to the FXS with the corresponding file id. Michal Oledzki University of Jyväskylä ALICE offline week 8 April 2008

  10. DA, Preprocessor • AliT0PreprocessorCosmic • Has been set up and was working together with DAs. • Modified to work only with Laser Calibration System (also in global run)‏ • Processes data from DAs and stores results in OCDB. • DCS part still missing, to be done before next cosmic run. see more in Michal presentation on Friday Michal Oledzki University of Jyväskylä ALICE offline week 8 April 2008

  11. Calibration : equalizing channels T0Physda.cxx during Data Taking (Global Run). DA collected histograms with CFDtime1 – CFD time on each side Currently, the preprocessor gets the mean of these histograms and writes it into OCDB to be used in reconstruction as the value of shift between channels for equalizing. The preprocessor should fit histograms and write in the OCDB the mean, sigma and number of entries. But, because of not fully tuned electronics, the fitting method used previously (with TSpectrum) was not fully functional. Some of these problems are already solved, others ( we hope) will be solved before the Cosmic Run May08. Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  12. Calibration: amplitude-time correction T0Laserda.cxx during Laser Calibration Runs. We can measure the amplitude in 2 ways: QTC (charge-time converter) and as the difference of time measurements by Constant Fraction Discriminator and Leading Edge Discriminator (LED-CFD) 08000025068005.10 08000025068005.10 1MIP 1MIP 10 MIPs 10MIPs Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  13. Calibration: results for mono-MIP(3mips) run 08000025081005.10 QTC LED-CFD before Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  14. Calibration results for multi-MIPs (1-10 MIPs) run before QTC LED-CFD 08000025068005.10 10MIPs 1MIP 10MIPs 1MIP Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  15. Reconstruction Choose 1st on the A and C side Calculate T0 = (TA+TC)/2 vertex = (TA-TC)/2+(fdZonA-fdZonA) AliT0Reconstructor & AliT0Calibrator have 2 options : pdc and cosmic ESD • 24 Time (UInt) • 24 Amplitude (Float) will be in “MIPs” unit • T0 (UInt) • Vertex (Float) Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  16. Reconstruction: mean time( T0) 36ps 44ps mono-MIP multi-MIPs Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  17. Reconstruction vertex mono-MIP multi-MIPs Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  18. Survey data into alignment object T0 Alignment • Alignment class (AliT0Align): • T0-C alignment based on survey data • Read data from survey (GRID)‏ • Calculate x,y,z for T0 • Create AliAlignObj • Store AliAlignObj to OCDB • T0-A to be surveyed at the end of April 2008 • storing fake survey data • storing real survey data as soon as available Tomasz Malkiewicz University of Jyväskylä ALICE offline week 8 April 2008

  19. Clearance around alignable volumes T0 Alignment cont. • Removing all T0 overlaps (precision 0.01 [cm]) • Correcting macro MakeT0FullMisAlignment to properly store misaligned objects • Shifts in T0 geometry • max shift in cm w.r.t. Global RS: • sigmatr = 0.05 • max rot in degrees w.r.t. Global RS: • sigmarot = 0.3 • For T0 alignable volumes (24 PMTs, 12 on A- and 12 on C-side) with no overlaps in the ideal geometry, there are no newly created overlaps by misaligning the volumes Tomasz Malkiewicz University of Jyväskylä ALICE offline week 8 April 2008

  20. QA RAW QA RAW based on AMORE under construction: AliT0QArec full set of needed histograms During physics run we can take data with calibration trigger with laser data tuned on fixed amplitude. Time, amplitude and T0 peaks position should be the same as in reference data. Efficiency of each detector module should be stable. 1st prototype will be ready before Friday Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  21. QA RecPoint Comparison between online and offline mean and vertex Comparison between Time and Amplitude spectra and reference spectra QA ESD Comparison between amplitude measured by 2 methods Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  22. To be done - I: • Remove overlaps before 11 April • Online Amore/QA next week • Update list of QA objects for what we really need • Real QA with reference data Alla Maevskaya INR RAS ALICE offline week 8 April 2008

  23. Do be done - II • In time-amplitude correction procedure, improve conversion of “time vs amplitude” histogram to calibration TGraphnext week • Add to the list of OCDB data table : position of peak for 1,2, 3… MIPs in amplitude spectra (DA & preprocessor type “Laser”)next week See Michal’s presentaion on Friday • Write in ESD amplitude in “MIPs “ unitsnext week Alla Maevskaya INR RAS ALICE offline week 8 April 2008

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