Sheila, Naoki

Today we found the excess noise from SQZ between 10-60 Hz as shown in the attachment. The yellow/purple show the DARM with/without SQZ. We think that the excess noise is scatter from SQZ and related to SQZ alignment. Since ZM4 yaw was close to saturation, we offloaded ZM4 yaw with SQZ ASC ON. The red shows the DARM after ZM4 move and the excess noise improved after ZM4 move. Although the excess noise improved, there is still excess noise compared with no SQZ and range is lower than May 8 when we had ~160 Mpc. 

Another notice from this plot is that PR2 spot revert yesterday in 78012 improved the noise below 20 Hz.