Minutes of March 18, 2021 ProtoDUNE-ND Electronics and Readout Meeting
- Attendees: Steve, Matt, Howard, MinJeong, Linda, Trevor, Alan, Geoff, Armin, Zelimir, James and Ting
- News and action task status:
- Steve reported we are on MINOS plane #81 for decommissioning. That is close to 30% done.
- Lab F light injection system ORC to be hold this afternoon at 1pm.
- Steve collected all the MINErvA DAQ servers for upgrade at Lab F
- Steve also to move all the MINERvA racks to NDOS building for rebuilding and ORC for 2x2 run
- Linda asked one MINOS rack together with Wiener power supply to be moved to NDOS
- Geoff to setup software discussion with Howard, Clarence,Anne and others
- Geoff is also to talk to Paul Rubinov and Christian Gingu about restarting the firmware teststand on the 14th floor WH.
- Howard is working with Steve, Jim and Gary to design cable tray and cable routine plan for the 44 MINERvA modules.
- We have moved the 2x2+MINERvA setup ~2" east in MINOS hall to leave more space to run cables. Now we have about 5.5" space for that.
- Condenser and short light readout rack are also moved around on the access platform to have clearance for MINERvA electronics installation
- Charge readout system
- Armin of LBNL gave a very nice presentation on the status of charge readout and its integration need -- see detail in his slide posted on indico page
- We need 8 Pacman boards for 2x2 test. Each TPC module needs two Pacman boards to bring signal out from the two LArPixel anode walls.
- Pacman board in an aluminum chassis will be mounted directly to the T-opening of the feedthrough on the cryostat flange.
- Each Pacman takes 24V/2A DC input using "plug-able thermal block terminator".
- There is currently no-sensing at the load for the 24V line. Linda suggested to have this function following FNAL engineering design standard.
- Weiner PL506 is to be the DC PS to provide the 24V. The current plan is to have 2 PL506 for the 8 Pacman neeed for 2x2
- Linda suggests to have one PL506 supplier for each TPC module for easy debugging during installation/commissioning
- The PL506s are to be on the readout rack off the cryostat. There will be also White Rabbit board to sync timing with light readout
- currently, time stamp is being used to sync the two systems
- The Pacman with white rabbit can also receive trigger signal from light readout for external triggering scheme
- the LArPixel system is design by self triggering to readuce data rate and size
- We suggest to put the PL506s and charge readout WR boards to the same rack with light readout system.
- Linda will start to rack building include the charge readout system
- Each Pacman readout (TCP/IP) needs 1gbps Ethernet port. The data rate is low (a few MB/s) so a 1-8 switch could work for 2x2
- Armin suggests 2x2 still use 10gpbs Ethernet for the whole DAQ
- Linda asked whether we have seen switching noise from the DC-DC converter on the board. The answer is no.
- Geoff asked about detail of data rate and slow control requirement. Armin refers to a talk by Peter Madigan linked below
- MinJeong asked the engineering note and leak test result of light readout feedthrough for safety engineering review. She will send Armin the documentation request.
- We have some schedule discussion for safety design review (SEDR). Armin comments that work still going on to finalize the design.
- Linda and Geoff suggested it will be more useful to start looking safety issue in the prototyping stage.
- To meeting the latest 2x2 schedule, we need to receive documentations and piece of hardware this summer to start the SEDR process.
- Light readout network request talk postponed to next meeting
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