PolHe3 Punch List For Restart

Onsite Personnel

NOTE: I'm not 100% sure of what restrictions on 'visitor' access will be imposed by the Lab.

Make sure your training and Site Visit status is still current to avoid delays.

• Stationed here w/ polhe3 as a priority
  • Brad, JP, Junhao, Mingyu, Murchhana, ???
  • Bill, Arun, Jixie, Carlos(?), ??? ("full-time", "part-time"?)

• Offsite, but not too far away:
  • [W&M] Todd,
  • [UVa] Xiaochao, Gordon?, Chris J?,

Tasks to complete before we get back on-site

• These will likely require OSPs to be written up and approved:
  • Remove/replace target enclosure panels
  • Laser/optics work
  • Mounting a new cell (not an immediate task) [RadCon involvement too]
  • Install collimator for 1-pass running
  • EPR photo diode replacement?

Pre-beam Target Work

• Restore items noted in HCLOG 3809218 when site access is restored. [Brad]

• Order spectrum analyzer for transverse configuration ASAP [Junhao]

• Laser status? [Junhao, JP]
  • One laser needs repair (Junhao will follow up on whether we should/can ship it to Raytum?)
  • Three new lasers require modifications/updates to our existing laser control software. These changes must be integrated with the existing EPICS logging that has been added to the our laser control software. [Junhao will follow-up on this]

• Test Kepco in current mode (Bill)
  • New power supply is now on-site at JLab
  • 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

• AnywhereUSB bridge : Contact with Target readbacks through AnywhereUSB USB bridge still drop out on occasion
  • Description of situation during A1n run:
    • At first, we fixed a network problem raised by Ethan. And this decreased the frequency of the drop out
    • Later, there are two senarios for the drop out. For the first senario which happened more frequently, after the device dropped out, we just need to close the individual labview programs with the devices dropped out and wait for the device to come back then reopen the program. If the device do not show up in the first senario, then we need to close the Labview and restart the computer.

• Prep a new target cell [Chris J., Todd?, Arun]
  • Chris working on characterizing Tommy and Butterball -- needs to get back in his Lab to wrap things up.
  • Will plan to get things finalized by early June
  • Do we need any hardware at JLab to have a cell ready [Arun]

• NMR issues
  • Hardware issues?
  • 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
    • [1] [2] [3] [4] [5] (Bill, Junhao, Arun)
    • Add list of calibration runs and what constants apply to what production runs here: PolHe3_Polarization_Measurements

• pNMR issues
  • Hardware : Check pNMR instruments to make sure they working properly. Fixes?
  • pNMR System Check: Follow procedure in [6]
  • pNMR Online analysis: Using Labview program to analysis pNMR FID signal (see [7]); Need to create a archived EPICS variable to record polarization measurement results from pNMR. (might need Brad’s help)

• EPR problems : [8] saw some progress on Tuesday [9], 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
  • Maybe design a new mount for the photodiode replacing the old mount designed for the fiber bundle

• Target Lasers :
  • Check laser power and wavelength
  • Check laser alignment
  • Implement another laser spectrometer for transverse polarization

• Target work:
  • NMR checkout/fixes
  • EPR checkout/fixes
  • Spin up curves for all 4 polarization directions, configurations

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! [10] -- Ethan working on this

• Get 3H07B Harp repaired [11] [12]; and a puzzle [13]
  • 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?

• iochc10 issues : Green now: Rebooted 3/2/20 with Dave Gaskell assistance. OPs wished to reboot hung iochc10 [14], noted in December as well [15]
  • 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)
• ??