The Vlasov susceptibility for two interacting electromagnetic waves is derived by using an extended version of the ‘‘κ–χ theorem.’’ The plasma is relativistic and magnetized. It is allowed for arbitrary k⊥ρ, ω/Ω, k⊥/k∥, and v/c. Nonuniformities in the background quasistatic magnetic field are also included. As an application, a general expression for the free‐electron laser susceptibility is derived.
|Number of pages||2|
|Journal||Physics of Fluids|
|Publication status||Published - May 1986|