The noise budget on the Y arm ALS has begun.
Right now the fluctuation of the green beat-note seems mostly covered by unknown noise which is relatively white.
(Though I feel I made a wrong calibration ... I have to check it again)
(Measurement condition)
+ The Y arm is locked to the PSL laser by acting o ETMY.
+ The end green laser is locked to the Y arm.
+ The fine resolution MFD (Mixer-base Frequency Discriminator) is used to observe the beat-note fluctuation
(We have two MFDs : fine resolution and coarse resolution.) |