Minutes of the forward endcap EMC eZuce SRN meeting, 9th of October 2017, 14:00-15:15

Presence:

• Basel: Werner, Natalie
• Bochum: Cathrina, Claudius, Fritz-Herbert, Malte, Matthias, Miriam, Tobias H.,Tobias T., Tom
• Bonn: Christoph, Merlin
• Groningen: -
• Stockholm: -
• Uppsala: Pawel
• Giessen: Hans-Georg, Markus
• GSI: -

Preamplifiers:

• The two preamps given to Basel show similar deviation as measured in Bochum, that is comparable gain ration (1.38 (BO) vs. 1.31 (Basel))
• Absolute values differ considerably: 0.98 V/pC and 1.35 V/pC (BO) vs. 0.78 V/pC and 1.02 V/pC (Basel) - reason may be capacitor tolearnces or additional stray capacitance form injection circuit PCB layout
• These two preamps will now go back into the mass screening setup in Basel where they once supposed to perfom identically

New tube-preamp-crystal assignment:

• Merlin presented the work on the new assignment including the ondividual preamp gains.
• New instructions for VPTT-unit manufacturing expected end of the week
• A submodule containing APD units and 2 VPTT units will be prepared in Bochum and given to Bonn this week, the submodules now in Bonn will return to Bochum for remeasuring (preamp-gain estimation by comparison)
• Cosmics data with the two VPTT units of known pream gain important for dynamic range calculation

Annealing APD cabling:

• Some discussion about annealing APD cabling on the HV trimming boards
• Further (more detailed) discussion on Thursday when Christoph will come to Bochum

Disc DIRC cabling request:

• Some discussion about space inside SADC crate frame: Disc DIRC people asked for availablity of EMC related space for cabling and voltage divider placement
• Concordant opinion that all space is needed for cabling and cable loop guiding