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- Enable the piezo
- Set the piezo to manual
- Set the piezo DC voltage offset to 0
- Set the piezo bias voltage to 25V
- Set the RF drive level to 15%
- Set the RF mode to chirp
- Find a chirp range that yields a valid detune
- If no valid detune found and chirp range exceeds 500000Hz, throw an error
- Set TUNE_CONFIG PV to Other (indicating that the cavity is at an intermediate state)
- Estimate the (micro)steps to resonance using an empirically found steps per hz from initial cavity commissioningÂ
- Currently 256/1.4 for 1.3GHz cavities and 256/18.3 for 3.9GHz cavities
- While the detune is outside of the piezo capture range (50Hz), recalculate the steps to resonance and send 90% of that value to the stepper motor
- Throw an error if the total number of steps moved exceeds the original estimate by 10% (this could indicate the motors disengaging)
- Set TUNE_CONFIG PV to On Resonance