Equilibrium orbit analysis in a free-electron laser with a coaxial wiggler

Details Equilibrium orbit analysis in a free-electron laser with a coaxial wiggler Equilibrium orbit analysis in a free-electron laser with a coaxial wiggler

2000-02-17

arxiv.org/abs/physics/0002032v1

Physics

Plasma Physics

13 pages, 9 figures, to appear in phys. rev. E

Scientific paper

10.1103/PhysRevE.61.7046

An analysis of single-electron orbits in combined coaxial wiggler and axial guide magnetic fields is presented. Solutions of the equations of motion are developed in a form convenient for computing orbital velocity components and trajectories in the radially dependent wiggler. Simple analytical solutions are obtained in the radially-uniform-wiggler approximation and a formula for the derivative of the axial velocity $v_{\|}$ with respect to Lorentz factor $\gamma$ is derived. Results of numerical computations are presented and the characteristics of the equilibrium orbits are discussed. The third spatial harmonic of the coaxial wiggler field gives rise to group $III$ orbits which are characterized by a strong negative mass regime.

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