YuhangZhao - 11:54, Wednesday 20 October 2021 (2719)
Comment to Filter cavity BS mirror is found to have some problems (Click here to view original report: 2712)
We have done some more check before opening the BS vacuum chamber.
1. Check BS P and Y transfer functions. They are similar with reference as shows in the fig1 and fig2.
2. Check coupling between P and Y. A substantial coupling increase is found as shows in the fig3.
3. We tried to close BS local control loop. But failed.
The results of test 2 and 3 make us really need to open BS chamber to check. The opening work is scheduled to be in this afternoon.
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