2023-02-07 MEC-U Project Controls and Data Systems Team Meetings

Attendees:

Alex Wallace Jing Yin Peregrine McGehee Gregory Brent Nate Landis Jason Bender Hill, Elizabeth Vinod Gopalan Jasmine, Nguyen Mitchell Cabral 

Action Items:

Topics:

Minutes:

iCal EPCS:

• We want to send some people to iCal EPCS to represent MEC-U. 
• iCal EPCS will be in-person in October in South Africa. 
• LLNL is planning to have some presence in regards to MECU
• LLE will chew on this item. 
• Alex is planning to visit on the MECU train. 

Setpoint API/Configuration Storage 

• No requirement operationally to command and converge on setpoints in a narrow timescale. 
• Action items to look into existing EPICS management systems at other systems. 
  • SCORE. Used pretty extensively for storage and management tool by the Accelerator Directorate. 
  • ATEF would come into play when doing preliminary checks before items

Vision System in RRL:

• Potential solutions for real time damage detection in the rep rated system. 
• Preliminary camera counts
• SLAC learned how that system is managed now at NIF
• SLAC has some action items for finding existing examples of architectures that are similar
  • One example is a camera that looks inside a cathode for thermal visualization rather than protection. 
• Requirements are that it needs to operate at sub-10Hz and operates in real time. 

LLE EMP-protection:

• Depends on where in the system. 
• If they see some EMP issues that take out encoders, they will add some EMI protector to the circuit board. 
• Proximity to source of EMI, LLE can send. 
• In cases where we are really close to, they had to go to open loop. 
  • 3kV per meter was the threshold. (approximate)
  • Most affective was brushless motors with HAL sensors for commutation
    • grounding document for OMEGA EP. 
• Most things on the chamber are powered down to ground, servos are also powered down because encoders looked like they were running on. Active servo-ing was turned off. 
• Generally its distance to shield from EMP and Neutrons, local relay disconnect box to disconnect wires mounted to target chamber. Disconnect and short all devices to local ground. 
• 30 inches of concrete protect chamber from basement.
• Usually use belldom shielding cabling. 
• What we really need to know, what is the susceptibility of our equipment to the EMP. 
• LVDT were used on cryogen system, but they were too noisy for them. 

Ciara Server:

• Custom job by company now called HyperTech. 
• Confluence Stub

TPR Specification:

• Still needs a stub. Jing Yin 
• Number of outputs on the TPR cards
  
  • 12 universal outputs (LVTTL or TTL)
  • This page may be helpful (EVR and TPR info)

Action Items:

• Nate Landis to send information on LLE motors and encoders/info that they use to mitigate EMP damage.
• Jing Yin TPR Card Specification Stub (Specific question from Ken: Number of outputs for TTL? LVTTL or TTL? Both?)