Aso, Ushiba, Akutsu
Final check before closing the OMC chamber. Confirmed no appararent ghost beams were left; no cables or wires were intercept on the optical beams.
I confirmed that the OMC locks in air, after the final check fo the OMC chamber.
Note that this is in air. Previously, we could not lock the OMC in air without saturating the feedback signal because of the large accoustic excitations.
Now the accoustic noise around the OMC chamber is much quieter because we turned off many instruments.
The fact that we can lock the OMC without saturation is a benefit of this.
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