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

Presence:

• 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: -

Preamplifier:

• 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.

Cables:

• 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.