This was a fast test right at the end of the commissioning period. I tried changing the offset on the AS WFS to see if that changes the low frequency sensitivity of DARM. Short answer: no change in sensitivity without the offset, and no improvement in sensitivity with a higher offset, which yesterday's tests suggested would help (79904).

I forgot to save the reference for the higher offset test (it was exactly the same as the others), but here is a comparison of the current offset (-0.15) and zero offset. The April 11 reference trace is also shown. We are very close to our best low frequency sensitivity in April (pre-OFI problems).

I think that if it helps the SQZ ASC to have no offset, we should turn this offset off. DHARD Y coherence is now very low even with the offset off.