edmond.merilh@LIGO.ORG - posted 19:49, Thursday 27 July 2017 (37836)
Mid-Shift Summary - Eve
Violin modes.
After taming the strings over a course of several hours and several failed attempts at NLN, fundamental modes dropped below the requisite level of e-15. Thanks again for the support of Dr Kissel
HFD came on site to check the radio at MX which hadn't reported properly this afternoon
PI modes (mode 28) were troublesome and caused one lockloss while trying to damp earlier in the shift. Later, I was having a bit more difficulty so I got Terra on phone support and ended up handling it without much intervention. Thank you Terra.
Sudarshan and Rick are currently doing PCal cal line testing. In a little while I'll be getting a call from Sudarshan to turn off a couple of lines and turn another one back on. This will take H1 out of Observing briefly. I may take the opportunity to run a2l if necessary.
a2l was run. A few more gain mods were made to violin mode damping and H1 is back into OBSERVING! ...and I just noticed that I'm 46 minutes late switching the Observatory mode.
there has also been a smattering of small earthquake activity but nothing destructive for H1.