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Thermal effects on the linear gain in free-electron lasers

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3 Author(s)
Freund, H.P. ; Sci. Applications Int., Corp., McLean, VA, USA ; Davidson, R.C. ; Kirkpatrick, D.A.

The authors develop a self-consistent formulation of the linear gain in both helical and planar wiggler configurations in the presence of an axial energy spread derived from a beam pitch-angle spread. Such a beam may be thought of as monoenergetic but with a non-vanishing emittance. The analysis includes collective Raman effects for both the helical and planar wiggler systems, and describes the gain at harmonics in the case of a planar wiggler. General dispersion equations are derived, and solved numerically, for each wiggler configuration which includes a general thermal function which describes the effect of the pitch-angle spread

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