RC Update and Run Plan for Aug 13, 2020

RC Meeting Information

RC Daily Meetings are at 4:15 PM, remote

Wednesday Aug 13 2020.

General updates

• Spectral waveform peak oscillation noted during owl shift oscillation
• Ethan found one of the rotation stage drives had locked up and was continuously turning QWP_driver
• Mingyu check the pulse NMR during an access Pulse_NMR
• I found the power strip the QWP rotation stage camera/light was turned off on the platform. Turned on and can view that camera now [1]

• The HMS was to -4.2 GeV/c @ 13.50. There were some issues with the Drive Controllers. They needed to be reset by Joe in the Hall

Drive_Controllers HMS angle

• HMS momentum was set to -4.2 Gev/c

https://logbooks.jlab.org/entry/3826528

• Reference cell was pumped with Hydrogen [reference_cell]

Pending problem

• Beam trip rate

Current Run Plan

Normal Production running

• Prerequisites

• Make sure operational restrictions are followed.
• Make sure the raster size is correct (4-4.5)
• Monitor beam parameters/configuration very often and post an entry like this at the beginning of your shift and when run conditions have changed
• Running on cell targets: raster always ON (4-4.5, size will be determined by the scraping checks), orbit locks ON, current ramp rate 1 muA/sec
• Always take 120Hz of EDTM
• Fill the BTA with realistic numbers. If the desired beam current is not delivered prorate your ABUs!
• Change the IHWP every 4 hours when running on glass cells

• Run plan

• Since we have been down since 9 am, we likely want to start back with the Beam / Raster checkout (short procedure)
Checkout
• Production on 3He; if not able to reach requested current, pro-rate the ABUs

Notes for tomorrow's 7:45 meeting

Future

• We are on the schedule to switch to 1st pass on the week of Aug 24 (Monday/ Tuesday). Need about ~ 3 days at 1st pass and would like to switch back to 5th pass before the weekend.
• EPR diode good for now, but check for future planned accesses.
• If Hall will have opening for 1+ hours, let Simona know as there is work to do on the cerenkov.