gabriele.vajente@LIGO.ORG - posted 16:31, Saturday 23 January 2016 - last comment - 12:21, Monday 25 January 2016(25123)
Band stop in PRCL
We noticed a small bump in DARM at about 360 Hz, coherent with PRCL. We added a 270-430 Hz elliptic band-stop. DARM improved and the coherence is almost gone. We are losing 9 degrees of phase at 50 Hz (PRCL UGF).
The filter is implemented in the SUS filter bank.
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The bandstop filter is now engaged by the guardian in the NOISE_TUNING step.