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
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