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Sun Dec 7 16:02:46 2008
Mag 5.1 EQ halfway to Vegas
There was a
Mag 5.1 EQ
Friday night at 8:18 PM.
It tripped most of our optics. They
all damped down passively except for MC2
. Further more,
ITMY seems to have come back to a different place
Don't know why MC2 was so upset but I think maybe its watchdog didn't work correctly and the side loop is unstable when there are
large motions. After I lowered the side gain by 10x and waited a few minutes it came back OK and the MC locked fine.
I have just now put all the WDs into the Shutdown state so that we can collect some hours of free swinging data to see if there's been
any damage. Feel free to redamp the optics whenever you need them. Someone should do the eigenfrequency check in the morning and compare
with our table of frequencies in the wiki.
I excited the optics using the standard
script. Here's the output:
Excited all optics Sun Dec 7 16:07:32 PST 2008