J. Kissel, B. Shapiro, B. Bland, R. Lane

Having assumed that the QUAD was " free* " as Betsy had said in yesterday evening's aLOG, I ran a suite of transfer functions remotely before the LHO day started, hoping to see that lacing had done no harm. However, on the first average of the first transfer function (I decided Pitch is the most sensitive to anything, so I took that first), I noticed something was terribly abnormal.

Long story short, it turns out that the suspension was *not* free, in fact, but its UIM stage had been left resting on its bottom earthquake stops. Since sense has still not yet been made of the signals coming out of the *connected* OSEMs, I made the call to do that first before starting another suite to test the do-no-harmy-ness of lacing. Onward into the fog!



Long story long, we "checked the weather by developing a model of the climate, when looking out the window would have sufficed." After seeing the first badness in the pitch transfer function with only one resonance (where there should be many), I immediately grabbed Brett, asking if such results are possible with merely cabling up the reaction chain. After a brief exchange, and Brett taking far more advantage of the quad model that I had realized was possible, he generated a model of what the TOP2TOP TFs of the QUAD would look if the UIM stage was locked. By the 4th of the 6 measurement suite, we had a full story that we believe the UIM stage was locked down some how. Of course, once we finished, Betsy went in and immediately found the the UIM stage was resting on its lower earthquake stops (see page 3 of "pics"). We had suspected the state in which the OSEMs and cables had been left (UIM OSEMs resting on the UIM stage -- pg 2 of "pics", PUM Cables secure to the stage but not connected, -- pg 1 of "pics"), but these clearly were not the primary culprit.

Some interesting points about the exercise:
- I know how to take further advantage of the QUAD model
- We now know what the TOP2TOP TFs look like when the UIM stage is locked down
- The TOP stage is clearly quite free even after cable lacing, given that the single resonance that did show up had a nicely large Q 

I attach the relevant plots and pictures.