Calibration and Operation Schemes for CEBAF RF Control

The RF control system for the CEBAF accelerator uses calibration tables to calibrate and linearize critical components in the RF control modules. This includes compensation for temperature drifts. Calibration data are stored in nonvolatile RAM on the CPU board in the control module. Algorithms for calibration of components like the vector modulator for the phase reference and the gradient detector are described. The calibration will be performed in a dedicated test stand which will be completely automated. The microprocessor in the control modules allows running of complex algorithms to achieve phase lock and optimize system gains for minimum residual errors for different gradients and beam loading.