2023-09-07 Meeting notes

• CM08 Lost Settings During PAMM and had weird apparent Microphonics. It was fixed by running rack checkout again

• Ryan: called at 2 AM on Saturday about unstable
• Lauren: worth early morning call just to continue phasing?
• Dan: Axel indicated we can now be called in the middle of night
• Nicole: should make clear that they are allowed to run SRF auto setup without calling

• Andy asked about H2-2 problems. They are still on going as of this morning. More below
• H2-2 catered by NIcole
• CM02-7,8 RF chassis swap or careful bring up may have gotten it running again
• Start doing cable checks from tunnel for loose connections. 4 racks at a time each PAMM. Also checking LO and PRL connections.

• H-2 regulation issues.
• looks like two cheetos/detune curves
• might be causing jitter and need for more feedback
• Slowly become unstable and lose amplitude
• Ryan: I don't think we can turn it off without triggering and LBLM fault. Tried this morning and did.
• Dan: Don't we have to turn those off in pairs?

• Got some money for automating tuner backup unit
• No progress this fiscal year
• Will need to ask for money again for next fiscal year

• Cavity 35-4 making 3600 mR/hr at 11 MV (previous <50 mR/hr during commisioning)
• need to drop to 8 MV to get the level that low
• Why did it get worse? Rad increase does not coincide with a quench or anything

Plan:

• Turn off L3 CMs

• Turn on decarad high voltage (cart in place)
• In CM35, 1 cavity at a time ramp up to ADES Max or radiation > 50 mR/hr
• Go to next cavity
• Recover L3

Nicole at least available. Will likely do tonight?

• Need to turn off H2-2, then run abstraction layer, and then turn beam back on
• Janice thinks could run

• Dan: Any progress on testing new code base for channel access issues
• Sonya working on putting epics infrastructure for Lisa