Proton Calorimetry/Meetings/2021/04/28

Minutes for UCL Proton Calorimetry Meetings, 28th April

Present

Simon Jolly, Raffaella Radogna, Saad Shaikh

Saad Shaikh

• Met with Simon last week to take detector measurements:
  • Measured stack thickness and recorded sheet order for UCLH beam test.
  • Briefly tested cross-talk with UCLH setup – little to none observed.
• Investigated source of noise "pulsing" observed during UCLH beam test, results record in this page.
  • Pulsing largely due to external electronic noise from 50Hz mains.
  • CMOS sensor amplifies external noise.
  • Grounding detector enclosure significantly reduces noise, even in lab conditions.
• Software developments:
  • Added argument to all plotting routines to set y-scale range. Setting to 0 sets the default range.
  • Added argument to averaged replay script to set the averaging rate (separate to frame rate).
  • Added argument to stepped replay script to choose which measurement to start from and the number of measurements to replay. Last measurement persists on screen.
  • Live plot and fit can now accept background and shoot-through measurements to plot calibrated data.
    • Calibrated data written to file accessed by Bortfeld page on web GUI.
• Completed analysis of photodiode data from UCLH beam test, results discussed in this presentation.
  • Due to signficant electronic noise, better not to do background subtraction.
  • Best fit results came by not performing any correction of pulsing observed from electronic noise.
  • Fit results similar for high and low current results. Should be able to do direct comparisons with CMOS sensor.
  • Wrote macro to read reference curves from UCLH. Emailed Andy asking for required x-axis offset to compare with measurements made in detector.
• Will analyse CMOS sensor data for next week.