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Reports until 10:29, Friday 24 April 2015
H1 SEI
hugh.radkins@LIGO.ORG - posted 10:29, Friday 24 April 2015 (18046)
LHO STS2-B Swap Study--Updated data

Attached are ASD comparing the Old (troublesome) STS2-B and the newly repaired STS2 temporarily in place in the beer garden.  The current traces are from ~0130pdt--looks like a quiet time based on the PEM traces.

When I compare these to the plots (calibrations in meters) in 18007 from Wednesday AM, I observe the following:

Strong coherences are moving to lower frequencies in all DOFs.

Unity transfer function for X DOF too is moving down in frequency.  The Y & Z TFs look pretty similar.

Maybe this means these signals are getting more stable.  However, the Z signal of the Old & New STS2-B still don't look like the A & C units, is this an indication of the vinyl difference?

Images attached to this report
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