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Status of the Calibration

Overview of calibration hardware & software status, future plans, and conclusions from the IFAE Udine Bootcamp in April 2004. Detailed analysis of calibration procedures, hardware improvements, and software updates discussed during the event.

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Status of the Calibration

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  1. Status of the Calibration Markus Gaug IFAE Udine Bootcamp, 19. April 2004 • General overview and status • Deeper look into the calibration: • Calibration procedure • Pedestal subtraction • Oscillating signals • Plans for the next two months • Conclusions, propositions for this bootcamp.

  2. 1. Current status hardware: • IFAE Pulser box: After successful installation of optical trigger transmission seems to fully work, except when there is high humidity. • Calibration triggers: Fixed trigger to L2 by separate delayed line, no majority trigger any more, no more cosmics in calibration data. • CT1 Pulser box: Left on the telescope, 10cm closer to box, but trigger cable used by AMC video camera. • Blind Pixel: Seems to be repared, but signals much too long, not yet solved. • PIN Diode: Will be installed in May, new optical read-out.

  3. Current Status Software: • Data until March 04: Software fully available, stable and documented. Has to be calibrated with F-Factor method. • Data from March-May 04: Software fully available and documented. Has to be calibrated with F-Factor method, calibration colour has to be written in file name. • Data from May 04 onwards: Need to write interaction with digital modules, intensity calibration missing.

  4. 2. Deeper look into Software: • Calibration Procedure: Signal extraction and calculation of calibration constants like decided on the Wuerzburg bootcamp. • New: Treatment of Quantum Efficiency: Calculate for each of the three methods a photons flux. Divided by the number of phe´s gives the quantum efficiency, stored in MCalibrationQECam. This class is filled and merged with the calibrations of different colours. • Calibration Procedure: Signal extraction and calculation of calibration constants like decided on the Wuerzburg bootcamp. • New: Treatment of Quantum Efficiency: Calculate for each of the three methods a photons flux. Divided by the number of phe´s gives the quantum efficiency, stored in MCalibrationQECam. This class is filled and merged with the calibrations of different colours and a global QE for cascades is derived. • New: Treatment of Bad Pixels: Continuously, an MBadPixelsCam is filled and merged. • Calibration Procedure: Signal extraction and calculation of calibration constants like decided on the Wuerzburg bootcamp.

  5. 2. Calibration Procedure (II.) • Once, Digital Modules installed: • One intensity and QE calibration at the beginning of the night: • MIntensityCam: Conversion factors, High-Low Gain conversion, dep. on intensity • MCalibrationQECam: Quantum efficiencies, merging of different colour calibrations, different methods. • MBadPixelsCam: Select already the bad of the bad ones. • Every 5-10 mintutes calibration with low intensity: • Update conversion factors • Monitor quantum efficiencies • Once, Digital Modules installed: • One intensity and QE calibration at the beginning of the night: • MIntensityCam: Conversion factors, High-Low Gain conversion, dep. on intensity • MCalibrationQECam: Quantum efficiencies, merging of different colour calibrations, different methods. • MBadPixelsCam: Select already the bad of the bad ones. • Every 5-10 mintutes calibration with low intensity: • Update conversion factors • Monitor quantum efficiencies

  6. 2. Pedestal subtraction • Now: Calculate pedestal and ped. RMS on the sums of 14 FADC slices (MPedCalcPedRun) and transform: • Mean Pedestal/slice = Mean of sums / number of slices • Pedestal RMS/slice = RMS of sums / sqrt(nr. slices) • Check: Are these relations true?

  7. 2. Changing behaviour over time • Sometimes, calibration constants seem to look nice, but:

  8. 2. Oscillations • All runs analysed so far, seem to oscillate at low frequency:

  9. 3. Plans for the next 2 months • May at La Palma: • Installation of PIN Diode • Installation of the digital modules • Readjustment of calib. Trigger (pre-scaler delay) • Define standard calibration procedure in Arehucas • May/June at Barcelona: • Implementation of MIntensityCam and lecture of DMs • Combination of colour measurements • Update Tdas0204 – full documentation of calibration algorithms

  10. 4. Conclusions • For analysis of February and March data, charge and rel. time calibration is fully implemented. • Classes are documented now. • Need systematic check of all the data • In May last major update of in calibration hardware. • Pedestals Oscillate!!! • DAQ reads out the pulses too late (since March) • Need to re-define the way, pedestal RMS are calculated.

  11. 5. Propositions for this bootcamp • Decide how to calculate Pedestal RMS. • Define one standard signal extractor. • Put standardized code into classes (examples: MJPedestal, MJCalibration, …) • Define how to monitor the camera stability and calibration constants, already inside one run. • Automatize the way to pick the right pedestal and calibration files. • Connection to Database. • Code test bench

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