Reports until 17:16, Tuesday 20 February 2018
H1 General (SUS, VE)
betsy.weaver@LIGO.ORG - posted 17:16, Tuesday 20 February 2018 - last comment - 07:48, Wednesday 21 February 2018(40622)
ITMY R0 RT OSEM short - attempted fix at feedthru

After Kyle and Gerardo slow vented the corner, Gerardo and I pulled the 4.5" feed-thru for ITMY CABLE #7 and #8.  We then pulled both in-vacuum cables off the feed-thru in order to swap in a fresh copper gasket.  I re-tightened the back-shell screws and inspected cable #8 and then reseated it - it felt better going in that it came out so we had hope.  Running th spectra showed no improvement however.  We then tried to inspect the ~1ft of cable we were able to pull out through the feed-thru hole and wiggle things before reattaching it to the chamber.  Still no change in spectrum.  Boo.

We'll embark on pulling the door tomorrow.

(Sad face.)

Comments related to this report
betsy.weaver@LIGO.ORG - 07:48, Wednesday 21 February 2018 (40625)
Link

Note, due to some miscommunication, Gerardo started to loosen the conflat screws on the ESD 4.5" feed-thru before I joined him for this work.  So we swapped that copper gasket and reseated the cable and feed-thru.