Electron motion in the combined ion-channel, helical wiggler and axial magnetic fields is
analyzed in the absence of a radiation field. Detailed analysis of the gain equation in a free …

In this article, the dispersion characteristics of the paraxial (near axis) electromagnetic (EM)
waves in a relativistic electron beam guided by the ion channel are investigated. Equilibrium …

Chaotic behavior of an electron motion in a free-electron laser with realistic helical wiggler
and ion-channel guiding is studied using Poincaré surface-of-section maps. The effects of a …

A relativistic theory for twostream free electron laser (FEL) with a onedimensional helical
wiggler and ion-channel guiding in the presence of self-fields are presented. A dispersion …

Efficiency enhancement in free-electron laser is studied by three-dimensional and nonlinear
simulation using tapered helical wiggler magnetic field or tapered ion-channel density. In …

A theory of self-fields in a one-dimensional helical wiggler free electron laser with ion-
channel guiding and axial magnetic field is presented. The steady-state orbits under the …

Dispersion characteristics of electromagnetic waves with radial and azimuthal polarization in
a rotating relativistic electron beam guided by an ion channel are investigated. Ion-channel …

A three-dimensional simulation of a steady-state amplifier model of a long-wavelength free-
electron laser (FEL) with realizable helical wiggler and ion-channel guiding is presented …

The dynamical behavior of relativistic electron governed by the combination of a realistic
helical-wiggler free-electron laser (FEL) with a uniform axial guide magnetic field is …

The polarization evolution of electromagnetic radiation propagating through an electron
beam-ion channel system is studied in the presence of the coupling instability. Employing …