Minutes of the forward endcap EMC eZuce SRN meeting, 16th of January 2017, 14:00-14:45

Presence:

• Basel: Werner
• Bochum: Cathrina, Claudius, Fritz-Herbert, Matthias, Malte, Miriam, Tom, Tobias H., Tobias T.
• Bonn: Christoph, Merlin, Matthias and more...
• Groningen: Myroslav
• Stochholm: -
• Uppsala: excused
• Giessen: -
• GSI: -

VPTT Subunit Production Preparation:

• For B-field screening only the tubes in BO currently under 1000 V gain measurement missing (plus preseries ZG-versions...)
• BO gain measurements finishing next week
• As soon as we have enough VPTTs fully screened to equipp all VPTT, Merlin will do the crystal-tube assignment and subunit grouping
• Werner has all remaining preamps (high gain - 0.9 V/pC) manufactured and tested, delivery at next chance (someone going to Germany anyway...)
• In order to start subunit manufacturing already "now", Merlin will prepare a sorting for a 'mean' subunit to start with (it turned out that there is no subunit not needing all three preamp types (gain) and the high gain versions are still in Basel - asked Werner for 16 pieces to be send to BO)

Annealing LED and I2C power supply:

• For supply of I2C components on the distributor boards an LDO regulator supplied by the +6V preamp supply line is foreseen
  • It has to be checked that there will be no noise introduction to the preamp circuitry
• The annealing LEDs have been checked to not compromise the noise performance of VPTT channels (different scenarios tested: open wires to LED, power supply connected to LED, switched on/off etc.)
• Discussion of annealing LED supply:
  • Individual, parallel connected I2C switched LEDs - too much circuitry, risk of I2C failure with the result of continously turned on LEDs
  • Series supply of all LEDs in a subunit (16 pieces) - needs external supply, additional cabling to the outside, full control over safe turning off the supply

Cabling:

• 2000 SHV connectors arrived at Bonn, 60 km of SHV cables will be delivered to Bonn in a month