Aggregator
Follow-up Re: Follow-up Re: PD update
Latest log entry describing the leak and repair details: https://logbooks.jlab.org/entry/4492580
West Arc LCW Cyclone Separator Leak
This morning a small stream of water was found spraying from cyclone separator outside behind B67 = NAB. This cyclone separator is for the West Arc tunnel LCW. Nominally, through the T, 3600gpm flows. As such, water was valved off in order to not worsen the leak.
There is still LCW flow, albeit reduced (Figure 4), through systems cooled by the West Arc LCW -- those in orange on the LCW commander (Figure 3), cooled by the "North Access Small Pump". But there is no active heat exchange, and as such we are leaving all systems that use West Arc LCW OFF.
APPROVED Repair B67 Lakos Cyclone Separator
Crew Chief Shift Log, 2026-04-28 DAY
Start of shift: Beam has been set up to HB (5th pass) and HC dumplettes.
Crew Chief Timesheet Summary: 28 Apr 2026 DAY
Control Room Reduced Staffing
Due to the west arc LCW issues, we are locking in FC2 and moving to reduced staffing in the control room.
Staffing will be reduced to 1 operator in the control room acting as SSO and one Crew Chief on Call. Check the Crew Chief announcements at the top of the ELog for Crew Chief on Call contact information.
HV Gun ramped down
Gun HV Turned Off
Gun HV Rampdown Initiated
Follow-up Re: PD update
COMPLETED Inspect 1L22 corrector
COMMENT ON Vacuum Activities CEBAF 3/10/2026 through 3/14/2027
North and South linacs, 0L04, and LERF (1F02). Due to no LCW supplemental fans were put on all the Agilent turbo pumps to prevent over heating. When LCW is back on vacuum group will remove the fans. Modules affected are 1L03, 1L04, 1L11, 1L13, 1L19, 1L20, 1L22, 1L23. 2L07, 2L08, 2L09, 2L12, 2L13, 2L17, 2L23. 0L04 and 1F02.










