L-Tubes were removed from 1L06 and 1L07 return transferline locations. Guard vacuum connection was disconnected from 1L06.
1L06 RT valve motor was found spinning. This is likely an issue with the belt (stripped, broken). This will be repaired before PR U-Tubes are installed.
No other issues were encountered.
Work completed for now. Rotated the polarizer back to a horizontal polarization orientation. Check the optics and found both the inseratable mirror and window coating strip off in a band. This is caused by high energy synchrotron radiation. This was anticipated and will not fundamentally change how the SRI operates.
Checklist completed for all shunt chassis and modules in racks W202B09, W202B10 (except for crate 2 ARC 4), and BS04B15.
The W202B10 ARC 4 crate was skipped because of complications removing thumb screws to access internal components on the backside of the chassis. This will need further evaluation to decide how to proceed for this one. All other racks in the system have now been checked.
This ATLis task will remain open until we decide what to do with the ARC 4 chassis. Some other minor findings will be discussed to plan on how to address them.
Chaudhary, Yoon, Janak, Delk
Gun ramped to 210 kV under vacuum, without any fied emission.
We noticed teh HVPS current baseline increased at ~206 kV, step woise lowered gun HV and the current level restored background level at 100 kV. Will verify if this bakground shift is repeatable.
iocse21 calibration - https://logbooks.jlab.org/entry/4549932
Approved. Good to work once PTW is on issue. The remainder of this week would be a good time to start this task while MSS is waiting on rinse water results for the East Arc. When MSS continues flushing the East Arc, tentively picking back up again next week (10/19), this work will need to be coordinated with where MSS is flushing.
Single mode fibers run and patched in for the South Linac segment (iocch2 and iocch2a).
Moved the last segment (SL, iocch2 and iocch2a) from old router to new router.
We are completely migrated to the new cal router. Going to start removing the old router from the control room rack.
Latosky
Cumbia
Nice work this morning...
1. Light equipment carried out and returned to source lab.
2. Remaining cage of equipment and Genie staged to be craned out.
3. Joe Thomas F&O installed two anchor for harnesses. Rich Kenny is bring temporary railing today. Final approvals expected Wed AM. Crane work tentively scheduled to happen after.
4. Scott Windham and Scott Higgins sleuthed chopping apertures, resolved with an ioc reboot.
5. Marcy sleuthed chopping chamber master slit and central plug, resolved by unkinking an air line.
6.
Found that an IOC reboot fixed communication to the chopping slits, though B is sometimes hesitating to move from the closed position. Doing home/resets helped get it moving again. All slits are retracted at this time.
Found a kinked air line in the input air to the chopper system solenoid system causing the master slit and central plug to go to their "fail safe" position of home, while the viewer remained in its "fail safe" position of retracted. Thanks to software and I&C for the help troubleshooting.
| Shift | Day |
|---|---|
| CEBAF Program | |
| MCC Crew Chief | Forman |
| MCC Operators | |
| Program Deputy | Mock |
| Announcements |
