Dan, Danny,
During the maintenance day we took a trip to EY to have a look at the HWS which has not been outputting any useful information. We took the plate off and noticed the beam was significantly pitched to the left. We recentered it and drove ETMY pitch and yaw with some sinusoidal signals and saw the equivalent in the HWS prism channels. We put the plate back on and have waited for a power up to check what we see. A video is attached. So it seems to be measuring the IFO beam absorption, it just has the wrong sign still. We're thinking of doing a small ETMY ring heater pulse to see how the HWS sees that. That should give the same result as all the other ring heaters.
We're going to request 1 watt of additional power on the ETMY RH for 5 minutes. This shouldn't be very disruptive at all since the carrier beam only sees the surface lens contribution which is a 1 microdiopter positive lens (as suggested by the TCS sim). The Hartmann on the other hand will see a -22.4 microdiopter lens. A time series of what we think the Hartmann should see based on a RH plant model is attached.
