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:
Task report | ||
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Topics:
Common Topics | Agenda Item | Revisit trailing action items. | |
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Key Takeaways from LLE Visit - CosyLab Support | |||
- | Testing Environments - Servers, timing, etc. | ||
MECU RRL Plan | |||
SLAC Topics | Agenda Item | ||
Laser Naming Convention Update | |||
LLNL high-level ICD update. | |||
- | Jama - LLNL Requirements | ||
- | LLE Requirements | ||
Next meeting topics | |||
Moved Offline | Agenda Item | ||
- | Syslog in EPICS | ||
- | User Privileges for EPICS |
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)
- Target timeline will be week of (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:
Info | ||
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The following laser and timing resources are reflective of LCLS-I systems. LCLS-II upgrades are ongoing and not complete. Please view these sources with this information in mind. |
- 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.