LIGO Document T2100269-v1

Comparing Wind-Driven Motion at LHO’s Corner and End Stations Between O3a and O3b

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T - Technical notes
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Prior to O3b, wind-driven tilt coupling in the 30-100mHz bands of motion at the end stations significantly hindered the performance of the Hanford interferometer. However, at the start of O3b (November/December 2019) wind fences were installed at the end stations in an attempt to mitigate the problems associated with high winds. We see that the fences significantly reduce the tilt at the end stations.

Comparing the effects of wind on the corner station and the two end stations following the installation of the wind fence, we can see that the effect of wind on the end stations has been reduced to the extent that now the wind has a greater impact on the corner station.

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SEI PEM Wind Fence

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