Naoki, Vicky

During the commissioning window today, we reset the AS42 offset and measured the SQZ ASC sensing matrix after 4 hours into NLN. The last time we measured the sensing matrix was only 40 minutes into NLN in alog72500 and the measured sensing matrix is quite different for thermalized/non-thermalized IFO. We updated the SQZ ASC input matrix as shown in the first and second attached figures (first: new, second: old).

The third attached figure shows the comparison of SQZ ASC input matrix (left: before 20230828, middle: after 20230828, right: after 20230906). The new input matrix after 20230906 looks more similar to one before 20230828. The input matrix before 20230828 was probably thermalized one and we may have changed it to non-thermalized one on 20230828.