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Reports until 15:32, Monday 22 October 2018
H1 ISC (ISC)
hang.yu@LIGO.ORG - posted 15:32, Monday 22 October 2018 (44736)
HARD Loop UGF measurements @ 23 W LOWNOISE_ASC state

Gabriele, Hang

We measured the HARD loop OLTFs at 23 W input power and LOWNOISE_ASC state.

We focused on the freq band close to the UGF. All the red traces are the latest OLTFs, except for DHARD_P which was taken when the DC gain was high (-40). Because the DHARD_P was marginal for the trace shown, we than decreased its gain by about 3 dB (from -40 to -30). Now all the loops have UGF around 3 Hz, and the loops seem to be fine. We were able to transition to NLN with these ASC settings.

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