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Towards the Analogue HCAL

Towards the Analogue HCAL. Start test of MiniCal prototype First results from test beam facility 3 types of photo-detectors available Preliminary data/MC comparison. analysis of data in progress large group effort: DESY, MEPHI, Prague, LPI, ITEP. e + 1-6 GeV. The MiniCal.

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Towards the Analogue HCAL

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  1. Towards the Analogue HCAL • Start test of MiniCal prototype • First results from test beam facility • 3 types of photo-detectors available • Preliminary data/MC comparison • analysis of 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% • cell read out: 3 tiles Erika Garutti

  4. 16 channels Photo-Multipliers Extraction of Energy Resolution Shower development in z direction Cell 2 Cell 1 Cell 4 Cell 3 • Cosmic MIP position as relative calib. • VERY PRELIMINARY: absolute calib: 1 MIP = 0.875 MeV (MC) Erika Garutti

  5. Energy Resolution for PM readout • very preliminary calibration • data resolution can be improved • 0.5% loss in resolution with 0.5 MeV threshold First comparison to MC prediction: •  GEANT3 and GEANT4 simulation of MiniCal available  Comparison between MCs needed Preliminary Erika Garutti

  6. Silicon Photo-multiplier (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 97% shower contained for 3GeV beam Tile 10 Tile 9 Erika Garutti

  7. SiPM Calibration Single photoelectron peak visible with pre-amplifier  for calibration only One photoelectron peak MIP peak pedestal From MEPHI (Moscow), B. Dolgoshein, E. Popova Erika Garutti

  8. Energy Resolution for SiPM Energy Sum 1 GeV 2 GeV Fix error of 10% on SiPM measurements VERY Preliminary VERY Preliminary 4 GeV 3 GeV 5 GeV 6 GeV E [MeV] Erika Garutti

  9. Avalanched Photo-Detectors (APD) Characteristics of 40 APD tested @ CERN (CMS test room): • quantum efficiency = 77.5% (500nm) •  stable at 1% level • capacitance ~30pF at 400V • gain vs voltage •  variation of ~5V at fixed gain • Variation of dM/dV: With power supply stability ~10-3 10% gain variation(@ gain 500) Temperature stability ~1oC high sensitivity to T variation Erika Garutti

  10. APD Homogeneity test U=405V, M= 200, T=290C U=410V, M=130 , T=29.50C • Good homogeneity • 1 APD used to read out 3-4 tiles Erika Garutti

  11. Outlook • Finish tests for all photo-detectors • Finalize data analysis + MC comparison •  LCIO format for data acquisition • fast comparison to MC • fast integration of other detectors • first hardware in this format !!! •  October: Test of ECAL/HCAL DAQ with the MiniCal  2004 construction and operation of the Physics Prototype equipped with SiPM + APD Tested together with the ECAL prototype Erika Garutti

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