adrian.helmling-cornell@LIGO.ORG - posted 17:16, Wednesday 25 September 2019 - last comment - 12:59, Tuesday 01 October 2019(52136)
Black Glass Blocking Stray Beam at HAM 3 Viewport as part of 48 Hz Investigation
Matthew Ball, Adrian Helmling-Cornell, Robert Schofield
Following up on our beating shaker injections, we found stray beams shining on the Ham 3 doors. We put black glass over the viewport with the brightest beam we observed (HAM3 illuminator viewport). More to come.
This eliminated the 48 Hz peak: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=52184