sheila.dwyer@LIGO.ORG - posted 16:59, Wednesday 11 March 2015 - last comment - 16:59, Wednesday 11 March 2015(17201)
Switched to high blends
The X direction at end X and the Y direction at the Y end are blended at 90mHz. Sensor correction is in the normal conifugration (no BRS). This was done at around 22:58 because we have had several lock losses due to large motions in the arms that ALS cannot handle.
This was at about -30 minutes on this screenshot, as you can see the arm control signals are reduced with the higher blends.
There is nothing that look like high ground motion on the seismic FOMs, although the winds are a little elevated (gusty 10-25 mph)
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Here's a screen shot of the wind trend. Sheila switched the blends roughly 1 hour in the past on this trend.
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Attached is a screenshot of the PEM's seismic FOM. So now we want to look at ISI T240s - 5 hours ago (~18:45 UTC -- after the Earthquake at -6 on the SEI FOM), - 3 hours ago (~20:45 UTC -- when the wind picks up, before the blends were switched) - and now (~22:45 UTC -- when the wind is still up, and when the blends have switched) Take a look at the time series of these few IFO channels: H1:ALS-(X/Y)_REFL_CTRL_OUT(MON or _DQ, whichever) this is what Sheila typically uses to assess badness. (and they're calibrated into [um]'s )
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