Aggregator
COMMENT ON Laser Alignments of B67 Cooling Tower Pumps
APPROVED Remove NL07 return U-Tube for helium flow modification
COMMENT ON Laser Alignments of B67 Cooling Tower Pumps
Task is partially complete. The starter for 67-CTP-5 has failed, placing this task on hold since pumps could not be rotated without reducing flow to the West Arc LCW HX and the ESR complex. Now that the SAM has begun, in collaboration with Cryo flow was reconfigured to reduce flow to the West Arc LCW HX so ESR complex flow can be maintained when an additional pump is shut off as this work is being completed. Contractor is currently scheduled to continue working on this task on 9/17/26. The remaining work will most likely require 2 days to complete.
COMMENT ON SAM26 Continuation of PSS Video System Upgrade
COMMENT ON Replace gun HV electrode
9-14: replace electrode with bad ceramic with newly build electrode: https://logbooks.jlab.org/entry/4547347
9-15: S&A determined that the electrode was assembled with too much yaw offset for the +/- 1 degree of adjustment on the top flange to compensate. We'll have to remove the electrode, adjust it, and return it to the tunnel in a few days after realignment within the yaw tolerance. The experts that have assembled the electrodes previously have all left the lab, we didn't realize the tolerance for this yaw alignment. https://logbooks.jlab.org/entry/4547552
Gun electrode: Alignment issue found
S&A measured the position of the electrode today with respect to the z axis of the gun and found that we are out of tolerance. The top flange has 2 degrees of yaw rotation, but the center of this rotation is 3 degrees from the z axis of the gun so we can't get into alignment.
Previously, the gun and electrode were aligned together in the lab before moving the complete assembly to the tunnel, and with the experts that assembled previous guns all having left the lab, we missed this alignment step. There is also an offset in the y position that we need to investigate.










