In this paper, we develop a new approach to the SASE FEL theory. It is based on the well-known system of Klimontovich-Maxwell equations. The special choice of the independent variable makes it possible to eliminate both electromagnetic field and retardation. That allows us to write down the BBGKY hierarchy for the s-particle distribution functions. Due to the smallness of the higher-order correlations we consider only two equations from the beginning of this hierarchy. © 2003 Elsevier B.V. All rights reserved.
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