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Evolution of a finite pulse of radiation in a high-power free-electron laser

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4 Author(s)
A. Ting ; US Naval Res. Lab., Washington, DC, USA ; B. Hafizi ; P. Sprangle ; C. M. Tang

The development of an optical pulse of finite axial extent is studied by means of an axisymmetric time-dependent particle simulation code for different rates of tapering of the wiggler field. The results illustrate a number of physical phenomena underlying the free-electron laser mechanism. These include: suppression of the sideband instability: the role of gain focusing versus that of refractive guiding: efficiency enhancement; and pulse slippage. It is found that a significant reduction in the sideband modulation of the optical field can be achieved with a faster tapering of the wiggler parameters. Increasing the tapering rate also reduces refractive guiding, causing the optical wavefronts to become more convex, thus spreading the optical field into a larger cross section. The corresponding enhancement of the peak output power is associated with an increased lateral extent of the optical field rather than an increase in the field amplitude

Published in:

IEEE Journal of Quantum Electronics  (Volume:27 ,  Issue: 12 )