travis.sadecki@LIGO.ORG - posted 08:56, Friday 04 August 2017 - last comment - 09:23, Friday 04 August 2017(37992)
Optical Lever 7 Day Trends
The Pit and Yaw plots all within the +/- 10 urad spec. The Sum plot for SR3 shows step down during the past day. ITMx Sum is also showing a trend downwards, and BS Sum is trending upwards.
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Everything looks normal except that step down in the SR3 oplev SUM. Looking at the DetChar summary page for the SR3 oplev, the step down corresponds with the beginning of an especially glitchy period for the laser (which also happened to be the 2nd such glitcy period of the day); up until this point the laser was decently quiet, with some small glitches. This laser is now top of the list for replacement. I am finishing up stability tweaks on a laser in the LSB optics lab and will swap it into SR3 as soon as it's ready.