Minutes of the forward endcap EMC eZuce SRN meeting, 1st of July 2019, 14:00-15:00

Presence:

• Basel: -
• Bochum: Claudius, Fritz-Herbert, Matthias, Tom
• Bonn: Christoph, Tobias
• Groningen: -
• Stockholm: -
• Uppsala: Pawel
• Giessen: -
• GSI: -

SADC Crates:

• Pawel reported from the SADC Crate Power Supply irradiation at KVI last week:
  • Module tested contained four power supply channels, one controller, one driver
  • Module survived dose of 10^11 protons/cm^2
  • 1 channel stopped working at 1.3*10^11 protons/cm^2
  • 2nd channel stopped working at 2.4*10^11 protons/cm^2
  • Is a radiation withstand of 10^11 protons/cm^2 enough?
  • Dose rate this time much lower than in previous irradiation tests, damage, however, occured at about the same total dose (no rate effect)
  • What exactly died on the boards is not yet clear - items still to hot to handle (need to wait for declining acvtivity)
  • An inspection of the first irradiated power supply did not take place yet either
  • A radiation hard alternative may be the CERN supplies (less efficient)
  • 15 power supplies we need soon for the endcap erection in Juelich

Submodule Cabling:

• Monday next week Christoph will come to Bochum in order to verify estimated signal cable bundle lengths on the endcap (using SADC crate mock-ups w/ original backplane PCB)