2022-11-14 MEC-U Project Controls and Data Systems Team Meetings

Attendees: Alex Wallace Jing Yin Jessica Jimenez Terzi, Ken Vinod Gopalan Hill, Elizabeth Mitchell Cabral Gregory Brent Jason Bender Nate Landis,  Robert Plummer Tyler Johnson 

Action Items:

Topics:

Minutes:

Testing Environment Plan:

• What test environment can SLAC provide to LLNL/LLE.
• Performance Testing in test environment. 
  • Can still functionally test interfaces, but should have real capable hardware and networking to support this.  

Timing:

• A stand-alone RF signal can be used to simulate an input into the timing system (Clock input).
• Large discussion on timing. LLNL and LLE would like to have a lower-level timing presentation from SLAC.
  • Previous timing presentation was given by Charlie, but was high-level.
  • Aiming in advance of LLNL CDR (beginning of January) 08 Jan 2023 
    • Target timeline will be week of 27 Nov 2022 (Tyler, feel free to adjust this date).

    • Tyler Johnson is working on organizing this presentation with hardware timing team.

      
      

      
      

      Discussion Topics for this presentation:
      Event (Course) Timing (LLE/LLNL) Overall easier and minimal hardware ~8 nanosecond triggers ~10+ picosecond jitters  Delivered optically over fiber (TPR - Timing Pattern Receiver directly outputs trigger)
      High Precision Timing (LLNL) Locking laser to RF Custom supporting hardware ~1 nanosecond trigger* ~10 femtosecond jitter* *In principle, system is still in development
      Interface between timing and various systems.
      Wiring and signals required.

      
      

      
      

    • See resources below to links to SLAC Laser/Timing confluence pages. 

      Interface between laser system and timing system.

IT/Servers:

• Omar to put together an IT supported device list for Barry
  • EPICS environment needs to run services such as logging system and achiever. 
  • SLAC may provide a rack for LLNL, but this is still being worked out.
    • Half a rack dedicated to the core.
    • For event timing systems, there are various small PCIE cards scattered around.
    • Precision timing system is ~half rack. 
      • For precision timing we may need to consider optical timing as well.

SLAC Laser Naming Convention:

• Updated "Photon Source and Systems Nomenclature" is uploaded to the SharePoint.
• PV naming presentation from last meeting was outdated.
  • SLAC will need to work on capturing new PV names.

Controls Requirements:

• As we review requirements, we should think of who will be responsible and begin assigning roles.

LLNL: 

• LLNL controls requirements inputted into Jama. 
• Requirements are out to review for LLNL/SLAC.
• Mitchell Cabral To ensure LLNL and LLE teams have Jama accounts/access.

LLE:

• Still working on hardware list which will lead into system requirements. 
• LLE will attempt to write requirements from a narrower view of the system. 

Resources:

• Confluence for Laser and Timing

• • Femtosecond Timing 
  • Supported Laser/Timing Devices
• Good Read for MECU RRL Plan.
• Charlie's old confluence pages will be linked here once found.

Action Items: 

• Hill, Elizabeth Concept of Operations slide deck for LLE.
• Tyler Johnson Timing Presentation for Event Timing and Precision Timing systems. 
• Tyler Johnson SLAC to document new laser PVs. 
• Mitchell Cabral Verify LLNL emails with confluence.
• Mitchell Cabral Create Jama accounts for LLNL/LLE team members.