travis.sadecki@LIGO.ORG - posted 18:09, Thursday 10 April 2025 - last comment - 13:34, Monday 14 April 2025(83864)
2025 April vent - VAC diary
Today's activities:
HAM1 feedthrus were installed according to D1002872-v10. D6 is completely populated. D1 was populated with everything except the feedthrus on the 5-way cross. Those will be added in the next days. The 3-port adapter (currently on D4 but destined for D3) has completed 1 of 2 feedthru swaps.
CP1 RGA is being revisited.
Comments related to this report
betsy.weaver@LIGO.ORG - 19:25, Thursday 10 April 2025 (83866)
The new RF 5-way coax cable in the feedthrus are a little tight in the 5-way cross, but seemed to work ok. Also, the connections on the 4.5" feedthru port are a deep pocket connection so I was not convinced that the new connector was fully seated since you could not visually see it. Marc came out and checked continuity to settle my fears given the newness of this joint and the fact that we have many more to do. All good so far.
Images attached to this comment
jordan.vanosky@LIGO.ORG - 21:14, Thursday 10 April 2025 (83867)
Because of the tightness of the connectors when pushing the 4.5" feedthru into the D6b cross (namely the D6-5wx2 port), Fil and I checked for grounding on all of the ports/connections on this cross. All passed.
Travis noted some tightness on the 5-way cross port 5wx4 on D1 opposite the chamber as well. So, Fil and I started checking these and indeed found a ground loop "fail" on both 25pins of the D1-5wx4 cross.
We will try to swap in new style 25pin cables D2000456 which have entirely PEEK connector to see if that mitigates this. More to come in separate log.
Picture of the completed D6 port on HAM 1, with new feedthrus and assembled five way cross extension.