Abstract
The nonlinear analysis and numerical simulation of Free-Electron Laser and other microwave devices is discussed. The technique employed makes use a single-mode approximation which permits an average of the Maxwell-Poisson equations to be performed over the wave period. The advantage of this technique is that the averaging process permits the consideration of only one “beamlet” of electrons which enters the interaction region within one wave period. This results in the requirement of far fewer electrons than is possible in large-scale particle-in-cell simulations. In addition, the average also removes the fast-time-scale phenomena from the field equations which permits a relatively large step size to be used in the integration. As a result, the computational requirements are substantially less than that for a particle-in-cell simulation, and the technique is a powerful tool in the study of narrow bandwidth coherent radiation sources. This includes the Free-Electron Laser, Cyclotron Maser (i.e., Gyroton, Gyro-TWT, Gyro-Klystron, CARM), and the Orbitron Maser. Because the fast-time-scale phenomena are excluded from the averaged equations, the formulation will also scale to the analysis of short wavelength (i.e., optical) operation of the Free-Electron Laser. A detailed discussion of the derivation of the relevant equations is given in 1-dimension for the Free-Electron Laser, and the generalization to 3-dimensions is discussed. Numerical examples will be given. Applications to other devices will be discussed.
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Freund, H.P. (1991). Nonlinear Analysis and Modeling of Free-Electron Laser and Microwave Devices. In: Drobot, A.T. (eds) Computer Applications in Plasma Science and Engineering. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-3092-2_9
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DOI: https://doi.org/10.1007/978-1-4612-3092-2_9
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