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.
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.
| Shift | Day |
|---|---|
| CEBAF Program | |
| MCC Crew Chief | Howard |
| MCC Operators | |
| Program Deputy | Ghosh |
| Announcements |
