The Effect of Ion-Channel Guiding on the Chaotic Electron Trajectories in a Free Electron Laser

• Authors: S. Saviz , H. Mehdian
• Languages of publication: EN

Abstracts

EN

It has been confirmed that when the equilibrium self-fields were taken into account, the motion of an electron in a helical wiggler with axial magnetic field may be chaotic. In this paper, the effect of an ion-channel guiding on the chaotic electron trajectories is analyzed. It is shown that the ion-channel guiding may modify the chaotic electron trajectories. It is also found that when the parameter ε, i.e. ε=ω_{pb}^2/4ω^2_c, is increased, the density of the ion-channel guiding, i.e. α_i=ω^2_{pi}/4ω^2_c, must be increased to keep the modification of the chaotic motion. The chaotic trajectories for constant parameter ε and increased density of the ion-channel guiding are presented. Numerical calculations are used to find the intersection between steady state group I and group II and resonance curves. Poincaré surface-of-section maps are generated to demonstrate the chaotic electron trajectories with axial magnetic field and its modification in the presence of an ion-channel guiding.

Keywords

EN

41.60.Cr

Discipline

• 41.60.Cr: Free-electron lasers(see also 52.59.Rz Free-electron devices—in plasma physics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 107
• Issue: 6
• Pages: 895-906

Dates

published

2005-06

received

2005-02-14

Contributors

author

S. Saviz

• Department of Physics, Teacher Training University, Tehran, Iran

author

H. Mehdian

• Department of Physics, Teacher Training University, Tehran, Iran

References

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Identifiers

DOI

10.12693/APhysPolA.107.895