[Tanaka, Komori]

We measured the transfer function from the MN to the TM in the yaw degree of freedom as the first step toward achieving higher-UGF yaw control.

We paid careful attention to reproducing conditions as close as possible to the interferometer locked state; for example, the OLDAMP yaw control on the MNs was turned off.
In addition, we turned off the TM lock filters, since our initial approach is to control yaw using feedback applied only to the MNs.

The measured transfer functions for each suspension are shown in the figure.
The results are consistent with expectations for a triple-pendulum system.