How to lock the cavity when the optical device is already in use ?
To lock the cavity you have to turn the Servo On ... Click on the Servo On button ...
You should see the cavity locking
on the CCD control TV (as bellow), and you should have more than 1000 W stored
in the optical cavity.
If it isn't the case, turn on the Slow Ramp ... Click on the Slow On button ...
If successfull you can turn OFF the Slow Ramp button.
Photons are now ready to meet electrons and give some Compton photons children.
If the cavity still doesn't lock after few minutes with SERVO and Slow Ramp ON:
Check the Yokogawa generator in the Compton rack (CH01B00).
Frequency should be 928 kHz, Amplitude 80 mVpp and phase -4 deg.
Pull down the OPTICS menu in the main epics window. Click on "Optic table" and then on "Servo".
Gain should be close to 167. A too high traking level in the feedback can prevent the
cavity from locking. Bring the "tracking Level" cursor down to low values (0.20 - 0.40)
and try to lock again with Servo and Slow Ramp on.
