Minutes of the forward endcap EMC eZuce SRN meeting, 26th of September 2016, 14:00-15:00


  • Basel: Werner
  • Bochum: Cathrina, Claudius, Fritz-Herbert, Malte, Matthias, Patrick, Tobias H., Tobias T., Tom
  • Bonn: Christoph, Merlin
  • Giessen: Hans
  • Groningen: Myroslav
  • Stockholm: -
  • Uppsala: Pawel
  • GSI: -

VPTT Preamps:

  • Agreement on total number of preamps needed for forward endcap (incl. spares): 900 pieces (225 'high gain' (0.89 V/pC, 488 "mid gain' (0.82 V/pC), and 187 'low gain (0.7 V/pC)
  • That is we need 100 more VPTT preamps than already produced
  • Werner will talk to Bernd about the costs and will check how to arrange preamp production
  • Much to our regret Werner will leave PANDA end of December!

Glueing Issues:

  • The unsolved glueing problem still prevents us from starting subunit manufacturing
  • Some discussion with the Giessen colleagues last week: We will try their glueing technique (no vacuumizing of glue, high pressure curing instead) with our crystals and compare the coupling strengths
  • Much improvement comes from usage of special primer before glueing. Need to test for transparency and radiation hardness (Giessen)


  • 150 units still need to be B-field gain loss measured. This will start soon and is expected to last 2 weeks.
  • About the same number of tubes needs to be gain measured with 1000 V supply voltage in Bochum. Some of the tubes currently located in Bonn (need to check...). Measurement setup is in preparation...

ADC boards:

  • Order of manufacturing: offers from possible manufacturers awaited, tendering process started
  • Myroslav: will there be test pieces manufactured before production of full batch? Pawel: 1-2 test pieces
  • Malte: How much time left to decide on shaper stage values? Pawel: 5-6 months
  • Bochum will start work on shaper stage tests: simulation of pulses (charge injection to Basel preamp) with rise time variation according to what is seen on cosmics events

Bonn Cosmics Setup:

  • The test subunit equipped with two crystals with two APDs each, glued with primer treated crystal surface and equipped with latest Basel preamp version works fine
  • Waiting for preamp output signal amplitudes resulting form vertically crossing muons in the crystals to confirm necessary APD preamp gain

-- ThomasHeld - 26 Sep 2016
Topic revision: r3 - 2016-09-27, ThomasHeld
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