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IPMAS04 has been enabled
Crew Chief Timesheet Summary: 21 Aug 2026 OWL
Crew Chief Timesheet Summary: 20 Aug 2026 SWING
COMMENT ON Commissioning of Helicity Decoder Board
Results from first look at the timing of the signals:
https://logbooks.jlab.org/entry/4543891
Need to figure out why Tsettle is starting 50 us after Beam Sync.
Follow-up Re: Many Trims Mismatching in North Access, Correlates w/ Room Temperature
MCC -> reduced staffing (SSO+ Crew Chief on call) PSS Mode 0
Operator SIGN IN
Many Trims Mismatching in North Access, Correlates w/ Room Temperature
The room temperature is jumping up about 10 degrees every 1.5 hours and seems to be associated with many trim magnets in the room mismatching at once. I can't head out there at the moment, but I'll drop by on my way out to see if anything is amiss. For the time being, I'm OPS-PRing this because it just seems very strange.
COMMENT ON Perform rfMiram12GeV 1-0
Ran Miram curves program in 2L15 first. Picked a zone with no bypassed cavities, Klsytron jumpers removed, or known issues with high KMAI. Cavities in 2L15 did not show high KMAV or KMAI during testing. Program ran to completion and Plots of curves attached here ("2L15_20260820_MiramPlots.png").
Many Small Mismatches w/ Trims Set to 0 A
Some trims are not happy at 0 A and occasionally cause a frustrating number of alarms for very small (on the order of 0.011 A) mismatches. It looks like a hysteresis cycle will get the alarms to simmer down for a while, but DC Power on-call gave us permission to put a bit of current (I am interpreting this to be +/-1 A) into them if it allows us to retain our sanity. I have an allsave with all the appropriate trims set to 0 A for when we need to put them there again.
Autolog save
Bleedthrough Script Testing Complete
I encountered a bug with Hall D nominal current reporting -2492 nA which appears to be a result of the background being measured as 2.724 uA. Looking at the LivePlot I had running during the background measurement preceding the Hall D nominal current measurement, it doesn't appear that the Faraday cup was actually measuring anywhere near what the script reports. I suspect it may be measuring 0.002724 uA and erroneously multiplying this by a factor of 1000, perhaps due to the new update for reporting the nominal current measurements for low current halls in nA.
COMMENT ON Gun2 photocathode Heat and Activation - August 2026
COMMENT ON Gun2 photocathode Heat and Activation - August 2026
ATLis Comments Daily Digest
rfMiram12GeV Concluded For the Night
LCLS II Commissioning Complete for Today, Channel Access Secured
LERF Operator Shift Log, 2026-08-20 DAY
Start of shift: LERF to Power Permit.










