XARM lock was achieved by POX11_I
Summary:
- The whitening gains of POX11_I and Q are 42dB so that POX11_I have the same amplitude as AS55_I
- The demod phase of POX11 was adjusted to eliminate the PDH signal from the Q phase. The phase is -100.5deg.
- In order to lock the XARM with POX11_I_ERR, I had to increase the trigger threshold from 0.1 to 0.2 as the arm was
kicked with the threshold of 0.1.
Method
- Lock the X arm with AS55_I at the XARM configuration.
- Adjusted POX11 demod phase so that POX11_Q is minimized.
- POX I&Q whitening gains were adjusted. When they are 42dB, POX11_I_ERR and AS55_I_ERR have almost the same signal amplitude.
(In reality, POX11_I_ERR has +1dB larger amplitude.)
- Adjusted POX11 demod phase again with better precision.
- Measured transfer function between AS55_I_ERR and POX11_I_ERR. As the sign was opposite, the demod phase was -180deg flipped.
- Tried to lock the arm with POX11_I_ERR. It did not acquire the lock. The arm looked kicked by the servo.
- Increased the trigger threshold from 0.1 to 0.2. Now the arm is locked with POX11_I_ERR. |