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Follow-up Re: 0L04 Cryomodule -- Briefly Emptied of L-He, Starting to Refill
MOLLER install 09/15/2026
COMMENT ON WA LCW Pump #3 Replacement 67-LCWP-3
ATLis Comments Daily Digest
CIS work summary 9/15
Today's summary...
1. The cathode face is mis-aligned a couple degrees outside of the tolerance of the slotted vacuum flange. Electrode will be removed on Thursday back to LERF Lab3a and reset to to be within +/- 1 deg tolerance of flange. Many thanks to S&A for the continued support.
2. The old cathode assembly (S/N R30-4) is tagged and ready for survey, we'd like to remove it on Wed to be able to free up its transport chamber.
COMPLETED Disconnect Magnets on Girder 1L08 and 1L09
0L04 Cryomodule -- Briefly Emptied of L-He, Starting to Refill
Appears that during CHL u-tube operations today when 4K flow was off to NL 0L04 (sometimes called 0L05) liquid He boiled off. Insulating vacuum expectedly rose from ~5e-3 to 3e-1 torr.
Around 1400, IV got much better, dropping back to e-3 range.
Cryo-diodes on 0L04 track w/IV pressure -- began rising around 11AM as liquid level in the zone dropped to nearly zero. Around 1400, diode temperatures plummetted from as high as 85K back to <20K.
All appears fine vacuum-wise now -- insulating vacuum re-established, module cooled back down, now slowly accumulating liquid.
COMMENT ON CEBAF/Halls PSS Certification SAM26
COMMENT ON Disconnect Magnets on Girder 1L08 and 1L09
COMMENT ON Disconnect Magnets on Girder 1L08 and 1L09
ACG Report
ACE Team Successfully Performed Linux Patching
Completed alarm guidance audit. Passed onto Operations for Review.
COMMENT ON SAM 2026 Box Supply Work Preventative Maintenance/interlock checks
Working under PTW - 11789. Preventive maintenance has been completed for BSY1C. BSY1C has been connected to the resistive load for testing; DCCT and controls still need to be connected to the power supply. Testing of the supply on the resistive load will happen tomorrow.
-O'Brien










