patrick.thomas@LIGO.ORG - posted 04:13, Wednesday 29 March 2017 - last comment - 06:45, Wednesday 29 March 2017(35173)
Ops Owl Mid Shift Summary
08:47 UTC Made it to NLN after earthquake rang down. Found unexpected SDF differences (attached as sdf_1.png) and accepted them to go to observing. Lost lock 3 minutes later. 09:39 UTC Made it back to NLN. SDF differences returned but with reversed values and setpoints (attached as sdf_2.png). Accepted them and went to observing. Lost lock 8 minutes later. 10:41 UTC Made it back to NLN. No SDF differences this time. Went to observing. Noticed large peak around 8 Hz to about 10^-14 in DARM. 11:10 UTC Range is dropping. Peak around pcal line at ~35 Hz seems to be broadening and contracting over time (see darm.png attached). Something is not right.
Images attached to this report
Comments related to this report
Range drop appears to occur before traffic noise (plot of range on top of SEI BLRMS usually associated with traffic attached).
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