Calibration and characterization meeting (TID/LCLS Ops) - 12/14/2023

Attendance:

Conny, Dionisio, Philip, Bhavna, Kaz, Alex, Xavier, Julian, Nolan.

Agenda items:

• Functional
  1. Evaluation of drift and changed procedure for 5 pedestal collection;
  2. Possibility to change the gain modes in the 5 pedestal script;
  3. Solving DAQ crashing issues;
  4. Bringing up gain calibration using florescence in the Marietta;
  5. Measuring temperature for the camera;
• Analysis and performance - ePixHR:
  1. analysis plan and data overview: Breakdown of measurements performed.xlsx
  2. Banding issue;
  3. CompEnOn stepsize;
  4. Gain and Offsets at different run and daq trigger rates;

Notes:

• Item 1:
  • Alex mentioned he is not necessarily seeing drift in dark run data when biasing to 20V;
  • Pedestals look stable, but we see original negative drift down;
  • over longer time scales we are seeing different pedestal values suggesting a longer-term drift happening. Should be evaluated;
  • Significant banding observed across the ADC range;
  • We need temperature monitoring to better evaluate the drifts;
  • We need to measure the pedestal drift with temperature;