Difference: Minutes2019-08-26 (1 vs. 3)

Presence:

• Basel: -
• Bochum: Matthias, Thorsten, Tom

• • The 12 GeV Panda FWEC EMC single crystal energy maximum is probably detetcable with all channels (detailed analysis follows)
  • The spread of channel responses (inter crystal and between APDs on one crystal) is as expected and acceptable
  • Second APD submodule is going to cosmics test stand soon

• The signal labeling/color coding should be improved: ideal would be an omission of the shrinking tube as it hinders cabling to the PCB and preferred is a labeling that does not move along the signal cable
• We therefore will change to the newly tested paper cable labels that we print on our own and that include the color coding by colored prints

VPTT-Submodules:

• • He presented results of scans of the alveole surface
  • All submodules turn out to be between 1.6 and 2.2 mm longer than expected from an existing CAD model
    • These numbers agree with the caliper measurements made on the submodules after finishing in Bochum

• • • Is the spread of elongation (1.6 - 2.2 mm) compatible with the thickness variation of the VPTT capsules?
    • Christian also presented x-ray images of a submodule showing about 0.4 (0.6) mm free space between crystal front faces and carbon inner (outer) fibre front

• • We therefore need to measure the resulting maximum distances of submodules (corners) to the backplate (minimum free space to the front lid)
  • Has there been a redesign (decrease of height) in the interface pieces in order to account for the elongation of the submodules by the introduction of the capsules?

Minutes of the forward endcap EMC Vibe/eZuce meeting, 16th of August 2019, 14:00-14:50

Presence:

• GSI: -

APD-Submodules:

• Cosmics measurment results of the first 16-crystal APD submodule:

• • The spread of channel responses (inter crystal and between APDs on one crystal) is as expected and acceptable
  • Second APD submodule is going to cosmics test stand soon
  • Noise figures of both submodules comparable in terms of sigma, but a closer look to the shape (non guassian contribution) is needed as this indicates the occurance of pickup noise
• Annealing LED cabling appears to be short (probably not too short but close to limit) - does this come from cable routing through the aluminum tube (as tested for one of the two submodules built)?
• The signal labeling/color coding should be improved: ideal would be an omission of the shrinking tube as it hinders cabling to the PCB and preferred is a labeling that does not move along the signal cable