Minutes of the forward endcap EMC Vibe/eZuce meeting, 18th of November 2019, 14:00-15:00

Presence:

• Basel: -
• Bochum: Tom, Jan R., Matthias, Tobias H., Claudius, Fritz-Herbert
• Bonn: Christoph, Ulrike
• Groningen: Myroslav
• Stockholm: -
• Uppsala: Pawel (recording)
• Giessen: Markus
• GSI: -

APD-Submodules:

• We decided to build two more APD submodules in order to test noise introduction via the annealing LED cabling also in Bochum setups
• Christoph will send around the correct HV supply redundance considering APD locating scheme
• Irradiation of HV regulation boards in GI:
  • Radiation induced address change of I2C device observed (once)
  • ADCs seem to change initially but remain stable afterwards
  • Current consumption rise on 5 V rail during irradiation, origin not yet clear - rate effect? Expose board to a tenth of the current dose in a second irradiation run
• There was (again) some confusion and discussion about radiation doses
  • 37 Gy is anticipated being the full PANDA APD lifetime dose, so this order of magnitude may also be a suitable dose considered for the HV regulation electronics located even further behind the backplate
  • ADC problems start between 30 Gy and 300 Gy dose, so a 10 times safety margin for irradiation cannot be met
• There is the plan to also expose components to neutron radiation by addind them to the light pulser/THMP components irradiation test setup (Mario, Vincent)