With Mark,

After 8885, from the MEDM screen, we discovered that the optical lever signals for SR3, SRM and the BS are not fluctuating with amplitude as high as that in SR2 length optical lever. So, we decided to measure the residual motion of SR3 as a comparision.

Figure 1 and figure 2 show the residual displacement and the residual velocity with all controls on except TM damp. From the graphs, we can see that the residual displacements of longitudinal, pitch and yaw are all below 1 rms, while the residual velocities are slightly above 1, which means we are very close to the 1 µm/s requirement (if this is the correct requirement). I haven't had the chance to measure the residual motion with the TM damped.