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Reports until 16:04, Friday 08 March 2019
H1 ISC
jenne.driggers@LIGO.ORG - posted 16:04, Friday 08 March 2019 - last comment - 16:49, Friday 08 March 2019(47405)
DHARD P injection

I injected bandlimited noise into H1:ASC-DHARD_P_EXC starting at about 23:55:00 UTC 8 Mar 2019, and increasing the size of the excitation by 3x at about 23:58:00 UTC, and then stopped the excitation around 00:01:00 UTC (9 Mar 2019).  Hopefully this is enough data to see if the DHARD coupling to DARM is more stationary.

EDITED to correct the time zones.

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gabriele.vajente@LIGO.ORG - 16:49, Friday 08 March 2019 (47406)
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At a first look, DHARD_P coupling appears to be much more stationary. Comparing to 47274:

  1. the coherence between DARM and DHARD_P during the injection is higher (see first plot)
  2. a spectrogram of DARM during the injection appears much more stationary than before (see second plot and third plot for a whitened version)

I also ran the non-stationary noise subtraction code, and confirmed that most of the noise coupling is stationary (see 4th figure). The largest non stationary contribution comes from modulation due to PRC1_P

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