[Ushiba, Komori]

We performed tweaking of PR2 pitch by ±40 µrad but did not observe any change in the DARM sensitivity.

At this point, we have tried adjusting the pitch degree of freedom in all relevant suspensions.
Based on previous trials, the most sensitive alignment appears to be INP2 pitch.
When tweaking this, we need to compensate for the reduction in arm transmission by adjusting PRC2 pitch.

We plan to further investigate these degrees of freedom with more careful tuning and evaluate their impact on the sensitivity.

It should be noted that adjusting PRC2 should also affect the alignment to the OMC.
Therefore, we should perform the OMC RF sideband alignment procedure after applying the pitch offset to get optimal alignment.
We will try this soon.