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0L04 Cryomodule -- Briefly Emptied of L-He, Starting to Refill

6 days 6 hours ago
Log Number: 4547657Logbook(s): Entry Makers: moserBody: 

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.

moser

iocsoftw4spce restored

6 days 8 hours ago
Log Number: 4547638Logbook(s): Tags: Body: restorelib 3.0.1 Target restore date was 2026-09-15 15:32:14 The output from the myRestore execution was as follows: iocsoftw4spce systemEnum@2026-09-15 15:32 2(2) restored Execute: /usr/csite/certified/bin/ced2Epics -ced ced -A -i iocsoftw4spce (success) PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 Procedure return status: Success
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