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Status of MiniCal analysis

Status of MiniCal analysis. MiniCal operational in e+ beam 3 types of photo-detectors tested PM and SiPM preliminary analysis  beam calibration  cosmic calibration energy scan results Preliminary data/MC comparison APD first calibration with beam  two read out boards.

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Status of MiniCal analysis

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  1. Status of MiniCal analysis • MiniCal operational in e+ beam • 3 types of photo-detectors tested • PM and SiPM preliminary analysis •  beam calibration •  cosmic calibration • energy scan results • Preliminary data/MC comparison • APD first calibration with beam •  two read out boards • analysis of all data in progress • large group effort: • DESY, MEPHI, Prague, LPI, ITEP Erika Garutti

  2. e+ 1-6 GeV The MiniCal 3x3 tiles per layer Tile: 5x5x0.5 cm3 97% Shower contained e+ 1 cell = 3 tiles combined in depth Erika Garutti

  3. Silicon PhotoMultiplier (SiPM) MEPhI&PULSAR SiPM Pixels of the SiPM Test of 3 types of Photo-Detectors • MA-PM –16 channels: • best photo-detector • cannot be operated in B • cell read out: 3 tiles connected to one channel Only for reference • Silicon photo-multiplier (SiPM): • new detector concept, first test with beam • sizes: 1x1mm2, 1000 pixels/mm2 • gain ~ 2*106, quantum eff. ~ 15-20% • single tile read out / mounted directly on tile • Avalanche photo-detector (APD): • already used by CERN experiments • gain ~ 500, quantum eff. ~ 75% • high pre-amplification required  3 preamp boards • cell read out: 3 tiles Erika Garutti

  4. Tests schedule • till 10 Aug. : PM studies  13 cassettes (4 cells + 1 tile) , 3 MA-PM 16 ch. • 10-25 Aug. : SiPM first test period  10 cassettes, 90 SiPM • -beam & cosmics MIP • -single photoelectron peak • -energy scan • 25-10 Sep. : PM studies  same configuration • beam & cosmics MIP • energy scan • 11-12 Sep. : APD first calibration 45 single tiles • Prague preamp board (16 ch.) • 15-30 Sep. : KEK group • - 1-5 Oct. : PM+SiPM cosmic calibration • 5-15 Oct. : SiPM second test period  12 cassettes, 108 SiPM • repeat all studies • 20-21 Oct. : APD second calibration  45 single tiles • Prague preamp board (16 ch.) • -LAL/HCAL preamp chip on Prague board (18 ch.) • -Minsk preamp Erika Garutti

  5. PM Calibration with beam • Beam calibration - individual tiles - cell of 3 tiles e+ Good reproducibility - independent on material in front - independent on repositioning Analysis from Evgeni Devitsin, LPI Erika Garutti

  6. Single tile calibration Sum of single tile calibration compared to cell calibration - 108 tiles+WLF tested with source  7% spread • 108 tile+WLF+PM •  16% spread Analysis from Evgeni Devitsin, LPI Erika Garutti

  7. PM Calibration with cosmics m • Cosmic ray calibration - cell of 3 tiles m MIP position fitted with gauss+landau • MPV cosmic shifted with respect to MPV e+ • Possible influence hitting-position of beam on tile Analysis from Evgeni Devitsin, LPI Erika Garutti

  8. Reproducibility of calibration - Second calibration one month after • Same experimental conditions • 10-15% shift of all PM channels • Tile-fiber system ageing? • New calibration last w.e. Analysis from Evgeni Devitsin, LPI Erika Garutti

  9. PM Calibration Cell of 3 tiles single tile Ped: 21.6 , s: 1.1 MIP: 81.1 <RMS>: 7.7 +/- 4.9 Ped: 21.3 , s: 0.9 MIP: 37.7 <RMS>: 8.4 +/- 1.3 Ped: 21.2 , s: 1.0 MIP: 36.6 <RMS>: 12.8 +/- 1.8 Ped: 20.5 , s: 1.5 MIP: 76.3 <RMS>: 10.5 +/- 6.2 Analysis from Evgeni Devitsin, LPI Erika Garutti

  10. Shower development with PM 3 Gev e+ beam • 97% shower contained in central tiles • 13 layers ~ 14 X0 Erika Garutti

  11. Energy Resolution for PM readout Energy Sum • pedestal due to background triggers  Negligible second particle in same trigger • different calib. lead to same dE/E • 5% systematic uncertainty Erika Garutti

  12. SiPM Calibration - Cosmic and beam calibration of all tiles w/o pre-amplifier  reproducibility studies (LPI)  calibration analysis (MEPHI) - Single photoelectron peak visible with pre-amplifier for calibration only One photoelectron peak MIP peak pedestal From MEPHI group  See E. Popova talk Erika Garutti

  13. Shower development with SiPM Single layer readout 1 MIP peak visible in first layer Tile 2 Tile 1 Tile 3 Tile 4 Tile 5 Tile 6 Tile 7 Tile 8 95% shower contained for 3GeV beam Tile 10 Tile 9 Erika Garutti

  14. Energy Resolution for SiPM Energy Sum • - non-linearity correction not applied • 5% systematic uncertainty •  GEANT3 with SiPM (see A. Raspereza talk) 1 GeV 2 GeV 4 GeV 3 GeV 5 GeV 6 GeV Preliminary E [MeV] Erika Garutti

  15. Result Comparison • good agreement PM/SiPM • systematic uncertainty still to be • calculated (fix 5%) • SiPM non-linearity correction • both MC w/o tile LY variation ~7% • GEANT 3 with Poisson treatment • of ph.e. (SiPM) Preliminary Erika Garutti

  16. APD Calibration • - tile calibration with source • correction factor for each cell ~ 20% spread (corrected)  Absolute calibration possible see G. Eigen talk • 14 APD connected to cells of 3 tiles • tested with 3 GeV beam, no absorbers • Preamp from Prague (Ivo) • APD values for MIP calibration: Ped: 18.9 , s: 9.9 MIP: 54.1 , s: 19.6 < s >: 17.2+/- 1.6 Compare to PM values: Ped: 20.5 , s: 1.5 MIP: 76.3 < s >: 10.5 +/- 6.2 Erika Garutti

  17. APD Calibration T = 29 C • second calibration (5 weeks later) • good agreement w/o check and polish • fibers. special PreAmp settings 420 V : 26% spread for 10 APD result from CERN test: 28% spread for the same APD Erika Garutti

  18. APD Voltage dependence • T = 29 C (stable) • exponential increase of gain • - smaller increase than observed at CERN APD test at CERN T = 25 C Erika Garutti

  19. Comparison of two boards Voltage sensitive preamp Prague Design pedestal s ~ 11 s ~ 6 Beam MIP s ~ 23 s ~ 13 Charge sensitive preamp LAL/ECAL chip Larger gain Erika Garutti

  20. Shower development with APD 4 cells (12 layers) read out with LAL/HCAL chip on Prague board Only central tiles used = partial shower containment Erika Garutti

  21. Energy Resolution for APD Preliminary NOTE: for APD only partial shower containment! … analysis in progress Erika Garutti

  22. LED monitoring PIN diode Stability ~1% PM 2 550V LED position corrected for ped. and PIN diode fluctuations: Stability ~1% PM 3 500V  See H. Meyer talk • very stable LED monitoring system required for APD operation • system available & tested on PM Erika Garutti

  23. Outlook • Finish tests for all photo-detectors • Comparison of various APD readout boards • Finalize data analysis + MC comparison •  LCIO format for data acquisition • fast comparison to MC • fast integration of other detectors • first hardware in this format !!! • Raw data/LCIO converter exists (F. Gaede) • GEANT 4 already uses LCIO format • combined data/MC analysis in LCIO format  M. Groll PhD thesis  2004 construction and operation of the Physics Prototype Erika Garutti

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