Difference between revisions of "PolHe3 Punch List For Restart"
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== Pre-beam punchlist == | == Pre-beam punchlist == | ||
− | Copied from pre-beam punchlist done just before MC6 shutdown. Some items | + | Copied from pre-beam punchlist done just before MC6 shutdown. Some items should be completed but require verification/confirmation. |
=== Techs w/ RadCon [Todd (or designate) for cooling jets] === | === Techs w/ RadCon [Todd (or designate) for cooling jets] === |
Revision as of 21:47, 17 May 2020
Contents
Step 1
- Restore items noted in HCLOG 3809218 when site access is restored.
Pre-beam Target Work
- Test Kepco in current mode (Bill)
- New filter (for 180 Hz) to install for current mode operation fix. Can always go to voltage mode if it doesn't work.
- Establish/verify a known-good production mode
- pNMR issues
- Software : Software/driver issue needs to be resolved. Checkout during next non-production down time (Moller or SHMS fix)
- EPR problems : [1] saw some progress on Tuesday [2], but issues remain.
- Tentative plan now is to continue the d2n program by replacing the photo-diode that is placed directly on the pumping chamber (we have many spares).
- It would be good to write up a procedure to streamline this replacement procedure for us and RadCon
- NMR Calibration Constants : Verify that calibration constants and input values associated with NMR and other polarimetry are consistent and will be correct when the software is restarted
Pending Issues
- Fix the epics variable for target field angle. This is the PV which is calculated from the coils currents that is in the startOfRun entries. It needs a new formula since we changes the coil orientation (Bill)
- Verify that all other EPICS channels are present and are still being archived [Brad]
- Look at trigger related signals on the scope under high load (reftime extra pules, FADC reftime-shaper pileup?, NGC noise/rate questions) [Brad]
- Target Ladder software must throw an error on a 'voltage' readback mismatch! [8] -- Ethan working on this
- Get 3H07B Harp repaired [9] [10]; and a puzzle [11]
- This is being pursued by Brad, Thia, et al. Still trying to make sure it gets on EES/IC's pre-beam repair list.
- https://logbooks.jlab.org/entry/3807201 Has Arun's note about the unfortunate reference cell alignment vs. the rest of the target ladder.
- NOTE: "Shift Leader must request a beam that is shifted horizontally to the beam left side by 2 mm to prevent scraping."
- Is there a way to shift the reference cell position before beam starts?
- USB bridge : Contact with Target readbacks through AnywhereUSB USB bridge still drop out on occasion
- iochc10 issues : Green now: Rebooted 3/2/20 with Dave Gaskell assistance. OPs wished to reboot hung iochc10 [12], noted in December as well [13]
- Confirm relevant procedures have been updated at MCC (Gaskell, Paul V.?)
- This runs the Moller cryo controls and should not be rebooted without expert oversight (does not impact operations). D. Gaskell is looking into getting this addressed properly with OPs.
- Compton related items in Hall C beam steer-up procedure still cause confusion between MCC and Shift Crew -- Gaskell?
- Procedures need to be updated at MCC
- Verify that inputs to 'Scale32'/G0 scalers (ie ROC5) are > 10ns in width. (Brad, Steve)
- replace the G0 scalers with something newer/better (SIS38xx or similar)
- Online analysis software ready to go? (Sylvester?, Brad)
- Most should be fine, but are we missing any 'physics' plots?
Pre-beam punchlist
Copied from pre-beam punchlist done just before MC6 shutdown. Some items should be completed but require verification/confirmation.
Techs w/ RadCon [Todd (or designate) for cooling jets]
- Turn on turbos for downstream beamline
- Turn on turbos for SHMS and HMS spectrometer vacuums
- Remove the guards on the SHMS and HMS entrance windows (verify)
- Remove the guards on the both upstream and downstream beamline windows (verify)
- Ensure the beamline window cooling jets are in position and on (verify)
- Ensure the target window cooling jets are in position and on (verify)
- ??
Miscellaneous
- [RadCon, RC] RadCon checklist
- [Gaskell] Beamline checklist
- [Brad] Detector/DAQ checklist
- [Walter] Hall checklist
- [OPS, RC] Schedule hot checkout of Hall C arc magnets/power-supplies
- [OPS, RC] Verify all relevant FSDs that may have been masked for the down are known about and ready to unmasked when appropriate
- [Lassiter] Enable all spectrometer magnet supplies, restore production settings for Cryo
- [Gaskell] Moller cooldown
- [Brad] Double check that rotation is enabled in the GUIs for both spectrometers
- [Brad] Ramp all SHMS and HMS magnets to something modest (quick check), or to first kinematic. For example:
- SHMS: 11.0deg, 7.5 GeV/c
- HMS: 13.5deg, 4.2 GeV/c
- NOTE: Coordinate with the target group on the appropriate HB setting so we don't interfere with any target pumping.
- [Techs, Brad?] Do a final check to ensure that there are no potential issues with remote spectrometer rotation
- Restart main alarm handler (resets masked channels)
- Restart target alarm handler (if needed)
- ??