[Meenakshi, Gautam, Shruti]
Summary:
- We initially aligned the arm cavities to get the green lasers locked to them. For the X arm cavity, we tweaked the ITMX and ETMX pitch and yaw and toggled the X green shutter until we saw something like a TEM00 mode on the monitor and a reasonable transmitted power.
- With the LSC servo enabled, the IR light also became resonant with the cavities.
- Then we measured the noise in different configurations. Attachment 1 shows the the ALS OOL (in the IR beat signal) noise with the arms locked inidividually via PDH.
The script for plotting the ALS beat frequency noise is:
users/Templates/ALS/ALS_outOfLoop_Ref.xml |