coil balancing for ITMY

[YoshinoriFujii]

Note

• The dir of this issue will be replaced with more suitable one soon. (Noted on 10th May.)

Todo

1. inject a line with appropriate actuators
2. check the P- or Y-oplev spectra with L exc with 4 of them, and check if the amplitude of peak(s) are reduced or not.
3. do the iteration
4. check the performance once the work above has finished.

[YoshinoriFujii]

For ITMY:

• This work was done by Oktm-san, Ymd-kun

• After the work, the couplings were measured with Swept-sine option between [3Hz: 15Hz].

• coil-balancing with a peak might not be effective, according to the measurement,