This page is for writing explanations or plans which we are not confident about and may be subject to change. For instance, a possibe course of action to carry out a particular type of measurement or the plan to follow to identify a noise source.

Noise hunting in SR3 optics' residual motion

Date: 03-08-2019.

Author: Fabian.

Context: klog entries 9702 and 9755.

On Friday afternoon I found high coherence between SR3 L and P degrees of freedom in at least two frequency bands, as measured by the oplev. High coherence is observed in both states ALIGNED and FLOAT.

Possible reasons for the high coherence are:

Plan for noise source identification.

Plan for reducing control noise

Date: 05-08-2019.

Author: Fabian.

Context: entry from 03-08-2019 and klog entries 9702 and 9755.

Following the plan for noise source identification I measured the coherence between the following degrees of freedom:

The highlights for the ALIGNED state are

The highlights for the FLOAT state are