Abstract
This paper briefly reviews the use of Lie transform perturbation theory applied to the dynamics of charged particle beams. Several details not provided here can be found in [1] and [2]. The work analyzes influences due to nonlinear components in external focusing of beams, a regime where the Courant-Snyder invariants are broken [3] for single particle dynamics. The Lie transform analysis is also used to analyze beams with space charge effects, which satisfy the Vlasov -Poisson system of equations. Equilibrium distributions may be obtained even in the nonlinear focusing regime, where simple solution such as the Kapchinskij-Vladimirskij [4] are no longer valid. The work utilizes results that were obtained earlier as part of the research activities of Prof. Allan Kaufman and members of his group.
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