Automated frequency tuning of SRF cavities at CEBAF

An automated cavity tuning procedure has been implemented in the CEBAF control system to tune the superconducting RF (SRF) cavities to their operating frequency of 1497 MHz. The capture range for the coarse tuning algorithm (burst mode) is more than 20 cavity bandwidths (5 kHz). The fine tuning algorithm (sweep mode) calibrates the phase offset in the detuning angle measurement. This paper describes the implementation of these algorithms and experience of their operation in the CEBAF control system.