Minutes of the forward endcap EMC eZuce SRN meeting, 28th of August 2017, 14:00-14:45

Presence:

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

Preamplifiers:

• Natalie agreed to look for the preamp gain measurements done in Basel in order to compare with Maltes test measurements on 14 pieces
• However, Werner pointed out that some measurements may be flawed by bad contacts to the test station. Must be confirmed by checking the measurement results.
• We therefore foresee to individually measure all preamp gains in a dedicated test stand at Bochum

Cosmics precalibration setup:

• Merlin presented an estimation of the accuracy of the precalibration measurements in the cosmics test stands which comes out to about 2 %
• This value presently goes up to 6.5 % if measurements of the same submodule are done in different stations of the test stand
• Reasons for this increase are currently under investigation

Assignment algorythm software:

• Matthias stressed that the sorting software from Bonn that assigns crystals to photo tubes and preamps should by made accessible to the collaboration by putting it to the PANDA GitLab
• As soon as we have detailed preamp gain data the assignment has to be redone
• There should also be the possibility to consider ready crystal-VPTT-preamp units (the ones already built) in the process

Irradiation of THMP and Light Pulser Units:

• Myroslav sent back the irradiated parts and they obviously still work as proper as at the end of the irradiation beam time
• Further studies on any deterioration of components go on

APD Irradiation:

• Giessen expects new APD grids from PSL/GSI for irradiation this week
• Andreas demand for strip chart monitoring of the APD dark currents not understandable against the background of agreement on irradiation of APDs with no bias supplied to