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)

-- ThomasHeld - 02 Dec 2019
Topic revision: r1 - 02 Dec 2019, ThomasHeld
 
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