Minutes of the forward endcap EMC SeeVogh meeting, 22nd of June 2015, 13:30-14:30

Presence:

• Basel: excused
• Bochum: Claudius, Fritz-Herbert, Malte, Miriam, Patrick, Tobias H., Tom
• Bonn: Christoph
• Groningen: excused
• Uppsala: Pawel
• GSI: -

Bonn VPTT subunit cosmics setup:

• Mis-mapping corrected now
• 15 of the total 16 channels look okay (1 trigger szintillator not okay)
• 16-channel plot shown (cosmics spectra with Landau-fits)
• What we see is what was estimated from a subsample already:
  • Cosmics peak is between 150 and 200 ADC counts (corresponding to the 145/185 mV/GeV estimated by Bonn people earlier).
  • This is much more than the gain spread of the VPTTs involved!
  • Reason unknown, maybe damaged crystal coverings (mirror foil).
• Total recording time up to now: 54 hours
• Trigger problem just occurred again (reason unknown)
• Agreed to change setup to include shapers in read out chain

Mechanics:

• Interface pieces in production now (Bonn)
• Distributed production to two workshops (8 crystal and 16 crystal interfaces separately)
• First test pieces in Bonn (may bring one to Bochum)
• Ordering for SADC crates submitted to KVI (waiting for delivery)

ADCs:

• Balancing filtering between analog (shaper) and digital signal manipulation
• Digital filtering also capable of reducing input amplifier noise
• Tests ongoing how to best cope with fast rising Basel preamp signals with respect to energy and time resolution
• Question to Bochum whether to buy a current version ADC board: no funding right now (~4.5 kEUR)