Minutes of the Forward Endcap EMC Vibe/eZuce meeting, 24th of August 2020, 14:00-15:00

Presence:

• Bochum: Matthias, Jan R.,Malte, Miriam, Tobias H., Tobias T., Sebastian, Thorsten
• Basel: -
• Bonn: Christoph, Johannes
• Groningen: -
• Uppsala: -
• Giessen: Hans Georg, Markus

Submodule Measurements Bonn:

• There is a problem with one APD in one of the submodules currently under test: Need to figure out if the failure is real or just a cabling problem or something like that.
• We decided to have another exchange of submodules by Christoph in Bochum in the near future. Christoph will also bring HV distributor boards
• Drifting of set voltages on the HV distributor boards is still not fully understood. Using a 100 (or 22) MOhm instead of the 10 MOhm one currently used seems to lower the drift and is therefore suggested to use by Christoph
• A casting compound (like Elastosil we use for read out unit casting) on the resistors may help in preventing surface currents
• One one submodule there seems to be a problem with noise introduction from a temperature sensor to the respective channel (need to take a closer look at it, never observed any problems like that in Bochum)

SADC Crates:

• Fritz-Herbert asked what power (voltage, current) needs to be supplied to the SADC crate power supplies (+ 12 V only?, what current?)