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Minutes of the forward endcap EMC eZuce SRN meeting, 10th of October 2016, 14:00-15:05

Presence:

  • Basel: Werner
  • Bochum: Cathrina, Claudius, Malte, Miriam, Patrick, Tobias H., Tom
  • Bonn: Christoph, Matthias, Merlin
  • Groningen: Myroslav
  • Stockholm: -
  • Uppsala: Pawel
  • GSI: Holger

Glueing:

  • Crystal with 2-APD-readout and test glueing using special Dow Corning primer fluid is still running temperature cycles (30 something) since weeks and still seems to be firmly coupled (read out ratio 1:1)
  • What is missing is a test of the primer concerning optical transparacy and radiation hardness
  • Test pieces (radiation hard glasses) are prepared and are still curing in Giessen where the missing measurements will be carried out
  • Further tests of different glueing techniques (e.g. pressure application) ongoing (time consuming because of curing), comparison of necessary torques to remove couplings after several temperature cycles

Forward endcap assembly frame:

  • This is the massive steel frame supporting the full forward endcap (including its aluminum frame) during assembly and Cosy data taking in Juelich as well as on the final transport to Darmstadt
  • There was a meeting Monday morning at a mechanical engineering company in Herne with the Juelich engineers involved.
  • After detailed discussion about the construction and a survey of the workshops we are convinced the company is well suited to do the job.
  • The company assured us to be able to finish the work within this year

Cosmics measurements at Bonn:

  • Matthias presented results of the measurement of the test subunit equipped with the latest ringing-free APD-preamps and glued wpth Dow Corning primer
  • There are two crystals in this subunit read out by two APDs each
  • Crystal 1 behaves as expected: very similar preamp output signals with the correct gain-200 bias voltages applied
  • Crystal 2 shows a read out ratio of about 4 between its two APD read out channels
  • Matthias will dissassemble the subunit to look for the cause of the problem
  • Malte will compare the resulting output signal heights of the read out of crystal 1 to the ones derived from Bonn beam data
  • Once we get consistent results (output signal height vs. deposited energy, concerning preamp gain) we will be able to definitely tell the APD preamp gain needed for mass production

Positioning of VPTTs according to B-field gain loss:

  • Merlin gave a talk describing the
-- ThomasHeld - 12 Oct 2016
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Topic revision: r1 - 12 Oct 2016, ThomasHeld
 
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