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Reports until 10:33, Tuesday 07 January 2020
H1 General (SEI)
thomas.shaffer@LIGO.ORG - posted 10:33, Tuesday 07 January 2020 - last comment - 07:41, Wednesday 15 January 2020(54334)
Wind fence seems to be working

Looking at a trend of the wind speeds shows that the end stations are consistently below the other buildings. This is obviously dependent on the direction of the wind, but this looks very promising.

The attachment shows the last ~15 hours with the end station traces (blue and purple) consistently below the other buildings. Zooming out got messy, but you get the idea with this shot.

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Comments related to this report
edmond.merilh@LIGO.ORG - 14:18, Sunday 12 January 2020 (54451)

It's my opinion that comparative anemometers on either side of each windscreen would be a more valid assessment. Typically the variance of the wind speeds from the CS to either unprotected end (and mids) can show fairly large differences. Keeping the H1PEM_WINDSPEED MEDM screen open is part of my regular screen setup (I stack Obs Mode/Wind Speed and Range)

laurence.datrier@LIGO.ORG - 07:41, Wednesday 15 January 2020 (54517)

I've been looking at the early data for the impact of the wind fence, and looking from 1st January to 8th January there's on average a ~5mph discrepancy between CS wind speeds and EX and EY (looking at CS wind speed - EX/EY wind speeds), and 2-3mph looking at data from 12th December onwards (I'm looking at max minute trends since that's what I used to see the impact of gusts of wind), compared to discrepancies of 0-1mph on average for O3a and for before the wind fence was completed.

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