Algorithms for the implementation of a low level RF control system for a klystron amplifier

This paper proposes three different control methods for the design a LLRF system of a klystron: classical Proportional-Integral control, Iterative Learning Control and Model Predictive Control. Theoretical aspects of the presented control algorithms are reviewed and commented. The resulting LLRF system has been implemented on a FPGA board mounted in a PXIe chassis. Experimental results are shown to compare the algorithms and to provide an evidence of their capability to fulfil the control specifications.