Minutes of the forward endcap EMC eZuce SRN meeting, 21st of November 2016, 14:00-15:15


  • Basel: Werner
  • Bochum: Cathrina, Claudius, Fritz-Herbert, Matthias, Malte, Miriam, Tobias T.
  • Bonn: Christoph, Johannes
  • Giessen: Hans Georg, Markus
  • Groningen: Myroslav
  • Mainz: Luigi
  • Stockholm: -
  • Uppsala: -
  • GSI: -


  • Current delivery rate of VPTT preamplifiers is ok for Bochum.
  • 100 extra VPTT preamplifiers will be delivered later (ok).
  • APD preamplifier production process initiated. Delivery expected in spring 2017.
  • Werner continues his work at Basel for some time.


  • Claudius has provided Christoph a list of low voltage cables. Christoph will check the space for the cable lugs of the LV cables at the distribution PCB.
  • I2C-bus cables with 3 mm diameter: Christoph looks for a solution for 2 differential pairs. Please tell him.
  • SPI cables would need four diffential pair.
  • These cables need to be routed inside the cold volume to the bottom sides. A length of 3-4 m should be ok for SPI, probably an active component is needed in between these cables. This is to be tested by Christoph.
  • HV cables ordered, 8 weeks delivery time.
  • Longer ground strips: to be ordered.
  • Bochum would need sample signal cables (Nexan) with UFL connector or pitch adapter for tests. Optimal would be the longest version (Malte).

HV distribution board

  • Christoph has performed long term tests in the lab. The resolution is ok. Setting 0.1V. The reason for a drift of 10mV is to be checked.
  • Next step is to order prototype boards.
  • The GSI chip will be submitted to production run. It can also be used as a I2C slave and has a factor of 3 better resolution.
  • There is no solution for a half Alveole HV distribution board.

SADC firmware (Bonn lab version by Johannes)

  • The lab firmware for the SADC developed by Johannes Müllers for Bonn is currently in use at Bochum und Mainz.
  • Johannes will provide different firmware files with different MAC/IP addresses. They will sent to different ports. This will allow to read more than 1/2 SADC.
  • The firmware will contain an improvement of the trigger detection (leading edge).
  • A software trigger is implemented (e.g. for baseline/noise measurements). Documentation will be sent.
  • Luigi asks, if the source code of the firmware can be made available. Johannes will ask Pawel.
  • In a future version the network IP will be exchanged, to support a copper interface instead of fibre. Bochum will use also in the future the fibre interface.

SADC proto irradiation

  • Myroslav reported on the proton irradiation of the SADC at KVI:
    • For fluence up to 1010 p/cm2: no problems with ADC chips, clock manager and SFP. No special (GBT) fibre connectors are needed. FPGA also fine, no need for triple redundancy.
    • Fluence of 108 p/cm2 no data loss.
    • It is possible to use double density (128 channel) SADC for the barrel.

Other KVI news

  • Clustering implemented in concentrator and compute nodes. Will be reported by Marcel at the next PANDA meeting.
  • Cooling test of SADC in preparation at KVI.
  • To get green light for crate production a backplane design is needed.

-- FritzHerbertHeinsius - 22 Nov 2016
Topic revision: r3 - 2017-01-05, ThomasHeld
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