Minutes of the forward endcap EMC eZuce SRN meeting, 14th of August 2017, 14:00-14:30

Presence:

• Basel: Werner
• Bochum: Cathrina, Claudius, Malte, Matthias, Miriam, Tom
• Bonn: Merlin
• Groningen: -
• Stockholm: -
• Uppsala: Pawel
• Giessen: -
• GSI: -

Preamplifiers

• Werner mentioned the tolerance of the gain determining capcitors in all three gain versions (0.5, 0.6, and 0.7 pF nominal capcitance) to be +/- 0.05 pF.
• However, from Maltes measurements obviously the medium gain range with the 0.6 pF capcitors shows clearly larger variation than +/- 10% and larger ones than the other gain versions
• We therefore need the individual preamp gains for matching, either from the Basel measurements (availability, precision?) or from new measurements to be done by ourselves

Annealing LEDs in APD subunits:

• Tests with different cabling arrangements done and quite promising
• Detailed results will be given in two weeks

SADCs

• Test setup for incoming SADC boards almost finished
• Problems with the power supply solved
• It seems that data transmission may be movable from SADC board to backplane (interesting for barrel and backward endcap):
  • One transceiver for more than one SADC board
  • Several SADC boards to be connected in series
  • Saving of number of data concentrators
• Further work on backplane design ongoing