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Crew Chief Timesheet Summary: 18 Jun 2026 DAY
Vacuum Group Summary 2026-06-18
Operator SIGN IN
Operator SIGN IN
Downtime Incident CREATED: Hall D no beam due to MZAAS04 issue
QuickPic - Hall B target changed to 1um Carbon, 5nA CW
QuickPic - Unable to deliver >70uA to xC due to 1L22-6 high KRRP. EESRF paged
"xB no beam and dumplette in for configuration change"
2L18 Drop from HV ELOG 4513078
Per ELOG 4513078 last night, fig 1 shows a watchdog fault on a permanantly bypassed cavity and as Michael Geesaman stated, there is no communication on cavity 1 due to no RFCM to comm. with. It has to have a RD1 in for the RFCM due to the HV relay shorted to let the zone go into HV. No other signals are coming or going from the RFCM so a watchdog (comm error) on cavity will not drop or affect the zone in any way (same as 2L10-3 permantly bypassed ). In fig 1 capture you notice that all the other seven cavities have a Quench fault.
iCalibrate: Hall C
AutoLog - Masking Hall C Normal Target
Hall C Counting Room Cooling Unit Failure 6-18-26
Liebert computer room conditioning system stopped cooling due to a condensate pump malfunction which automatically stops the system from cooling to stop the production of condensate and minimize water overflowing into the access flooring subfloor area. The condensate pump has been eliminated since a sanitary drain was closed enough to replace the condensate pumping system with a gravity condensate drain. Cooling has been restored.
For additional information or clarification, please contact Carroll Jones at 757-876-1778 or Mike Sprouse at 757-846-1707.
"xB refilling H2 target"
QuickPic - Hall C Taget Change: 40uA -> 10cm Dummy
AutoLog - UNMasking Hall C Normal Target
iCalibrate: Hall C
AutoLog - Masking Hall C Normal Target
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 06-18-26
Time : 11:25:22
Day : Thursday
Shift : Day
Crew Chief : Richardson
Program Deputy: Nissen
Team : X
Arm : Barker
Designated SSO: Thomas
LERF Operator:
Operators : Barker, Thomas
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
PD UPDATE: Plan for MZAAS04 work
The plan is to go down during the maintenance day next week and do a closer inspection to determine the course of action on repairing/replacing the magnet and beam pipe.
There will be a meeting to plan the maintenance day work at 9:00 am in the MCC conference room on Monday the 22nd.










