Minutes2016-08-29 < EMC

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---++ Minutes of the forward endcap EMC eZuce SRN meeting, 29th of August 2016, 14:00-15:15
---++ <a name="Presence:"></a> Presence:
   * Basel: Werner
   * Bochum: Fritz-Herbert, Matthias, Tobias T., Tom
   * Bonn: Christoph
   * Giessen: Hans, Markus, Stefan, Rene
   * Groningen: Myroslav
   * Stockholm: Karoly, Markus
   * Uppsala: Pawel
   * GSI: -
---++ <a name="Preamps:"></a> APD Preamps:
   * The performance of the new APD preamps is very satisfying. They work stable w/o oscillation tendencies and give low noise output signals.
---++ <a name="Glueing:"></a> Glueing:
   * Several things discussed:
      * The 1:2 problem of differently responding APD channels on one crystal is obviously related to the glueing even though we do not exactly understand what is going on
      * Giessen glueing tests show loss of transparency of coupling w/ primer ('milky' look). Maybe they used too much primer - we will redo such glass on glass couplings
      * Usage of Dow Corning primers clearly improves adhesion of glue to crystals
      * Maybe the usage of vacuum to the glue before coupling harms the glueing process/strength of adhesion? GI does not 'apply vacuum' and they report to have no problems w/ fallen off detectors. We will compare both glueing methods for strength of coupling
---++ ISEG HV modules:
   * Tobias and Matthias reported about several problems with our ISEG modules (wrong HV readings, unstable zero load currents, full channel failures etc.)
   * Some modules have been sent to ISEG and are fixed now - they charge about EUR 750,- for repair!
   * The whole HV supply situation is not satisfying: We have regularly failing modules, all modules seem to need regular calibration or repair. Serious APD screening is heavily affected by this. It is unclear how to run a 10-years-experiment with such equipment.
---++ SADC:
   * Fritz-Herbert and Tobias flashed the Bonn software to one of the FPGAs on the board
   * However, there seem to be hardware communication problems. Pawel mentioned a possibly broken link-status LED that may confuse people...
   * Pawel will provide a special link test tool and asked whether the correct PLL frequency is set (need to be checked)
   * Johannes will be able to come to Bochum next week if still needed
-- Main.ThomasHeld - 30 Aug 2016

Topic revision: r1 - 30 Aug 2016, ThomasHeld

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