GWINC quantum noise curve is replaced with dynamically-generated shot noise curve. Radiation pressure will be included later.
The null stream spectrum shows 8×10−8 mA/rtHz shot noise, which seems to imply 17 mA of dc photocurrent on the sum, rather than the expected 20 mA.
Matt, Evan
The attachment shows two simple power-law curves (1/f2 and 1/f2.5) superimposed by eye on the residual. At first glance it is not clear which fits better.
In the case of 1/f2, we are looking for something that makes a white force noise on the bottom stage of a suspension (e.g., white electronics noise).
In the case of 1/f2.5, we are potentially looking at something less mundane; e.g., a force noise that goes like 1/f0.5, or potentially elevated structural loss on some suspension.