The problem of controlling tile variations in the rf power system can be effectively cast as an application of modern control theory. Two components of this theory are obtaining a model and a feedback structure. The model inaccuracies influence the choice of a particular controller structure. Because of the modeling State Feedback uncertainty, one has to design either a variable, adaptive controller or a fixed, robust controller to achieve the desired objective. The adaptive control scheme (usually results in very definition: tile state of a dynamic system is the smallest set of complex hardware; and, therefore, shall not be pursued in this physical variables such that tile knowledge of these variables, research, in contrast, the robust control method leads to simpler hardware, however, robust control requires a more accurate mathematical model of the physical process than is required by adaptive control. Our research at the Los Alamos National Laboratory (LANL) and the University of New Mexico (UNM) has led to the development and implementation of a new robust rf power feedback system. In this paper, we report on our research progress. In section one, the robust control problem for the rf power system and the philosophy adopted for the beginning phase of our research is presented. In section two, the results of our proof- an optimal state-feedback design with its stability robustness-of-principle experiments are presented. In section three, we describe the actual controller configuration that is used in I.ANL FEI, physics experiments. The novelty of our approach is that the control hardware is implemented directly in rf without demodulating, compensating, and then remodulating.
Los Alamos National Lab., NM (USA)
12. international free electron laser conference (FEL-12)
Department of Energy
Abdallah, Chaouki T. and W. Joel Johnson. "Robust control of accelerators." 12. international free electron laser conference (FEL-12) (1990). http://digitalrepository.unm.edu/ece_fsp/12