• State of the Project (Bozhidar)
• Recap of design philosophy
• The idea is to have a single electronics chassis to serve all energy extraction types
• The chassis consists of a motherboard connected to a set of cards (functional diagram in slides in indico link) on one side and to a back-panel on the other side.
• All hardware except the back-panel (different connectors depending on EE HW, passive components only) will be identical
• The firmware of the controls cards will be changed depending on the EE HW
• Recap of project progress
• A prototype for the vacuum switches has been made
• A pre-series of ten boards has been launched for general testing and radiation testing in CHARM
• The series design should be finalized in September 24
• Small changes are foreseen to increase test-ability of PCBs (with spring contact based tester)
• Main production should be launched in Jan/Feb next year
• à outcome of reliability study should be ready for design finalization in September 24
• State of the reliability study (Lukas)
• Overview presented - https://indico.cern.ch/event/1380711/contributions/5815765/attachments/2800642/4885911/slides%20and%20notes%20post%20meeting.pdf
• What was done
• Functional diagram
• Top-level FMECA
• Simulation model for most critical function: drive switch opening upon opening of FPA loop
• What was observed
• The most critical function requires a blind failure rate of approximately a few hundred FITS per redundant path. It should be compared against a component based prediction to ensure that requirements are fulfilled.
• The behaviour of the EE controls under power loss for the vacuum switches should be investigated closer, as the opening needs to be actively driven
• Other possible critical interlocks received should be inspected closer
• Next steps
• To cover the mentioned observations, it was considered best to analyse them specifically for the situation of the vacuum switches as they are considered most critical. Based on the outcome of the model for the vacuum switches, it will be checked whether there are other more critical use-cases (e.g. electromagnetic switches). The aim is to have results for the vacuum switch scenario by summer.
• Action: Bozhidar will send the latest design files
• Action: Milosz and Lukas will use the design files to prepare component prediction templates
• Action: Bozhidar will provide a more detailed representation of the critical paths for driving the switch opening of the vacuum switches under a critical interlock (opening of FPA loop, loss of power, possible other external interlock)
• Action: Milosz and Lukas will update the simulation model accordingly
• Also considering comments made by Bozhidar during the meeting
• Additional fan-out of signals
• Monitoring of voltage presence/power supply situation