Crew Chief Shift Log, 2026-09-04 DAY
Start of shift: Injector in Restricted Access. NL, SL, and BSY in Power Permit
Start of shift: Injector in Restricted Access. NL, SL, and BSY in Power Permit
extractor gauge turned on in HV chamber for vacuum evaluation prior to gun vacuum work: https://logbooks.jlab.org/entry/4546497
Extractor gauge turned on in the HV chamber. Running this over the long weekend will degas the gauge and allow us to characterize the vacuum in the chamber prior to the vacuum work the week of Sept 14. As expected, there was an increase in ion pump pressure when the gauge was turned on due to the hot filament outgassing. Gauge reads 6.74e-10 Torr after 40 minute warm up, still dropping.
Still searching for a cable that works with this older laptop to turn on the RGA, RGA may have to wait until next week to warm up.
the HV cable, required to be removed before beginning the vacuum work described in this ATLis, has been completed. https://logbooks.jlab.org/entry/4546475
Magnets disconnected by DC power. I moved the alignment brackets into the cabinet as well, and we'll need to make sure to protect the terminal blocks before baking. Starting RGA and extractor gauge measurements to run over the weekend and be recorded next week.
Figure 1: Known issue -- ground water intrusion in East Arc around station 1880.
Figure 2/3: New issue -- small leak (drip every 10-20s) from hose fitting / attachment point for LCW hose for JA9A20 dipole.
Figure 4/5: New issue -- small leak (drip every 10-20s) from hose fitting / attachment point for LCW hose for JA9A21 dipole.
Figure 6: New issue -- SE corner sump pump. At the ~30deg bend away fro the wall there is a leak that is leading to the puddle seen on the ground. Will submit an F&O work request.
Figure 7: East side of SL. Ice ball. Not an infrequent occurrence in this spot.
Measured voltages of all crates in the main ring except the injector. The remaining crates will require two power cycles to facilitate their measurement. one to insert the card and another to remove it. The IOCs below will be cycled to facilitate this on tuesday
IOCIN4, IOCIN1B, IOCSE12, IOCSE19, and IOCSE4.
two crates require new fan trays
IOCW3SE1, and IOCEA3. fan trays will be replaced tuesday following the injector measurements.