Realistic Gain in Raman Regime Free Electron Laser —Effect of Beam Energy Spread—
Abstract
The influence of electron beam energy spread on FEL gain is investigated quantitatively. The dispersion relation is derived according to Johnston’s formulation. As the results of the analysis, it is found that the growth rate of the high frequency FEL instability is greater (less) than that of the low frequency instability when the beam energy spread \varDeltaγ<(>)\varDeltaγ_{c}. Here, \varDeltaγ_{c} is the critical beam energy spread which depends upon the beam current and energy, the wiggler wavelength and so on.
 Publication:

Journal of the Physical Society of Japan
 Pub Date:
 April 1986
 DOI:
 10.1143/JPSJ.55.1122
 Bibcode:
 1986JPSJ...55.1122K
 Keywords:

 Electron Beams;
 Electron Energy;
 Free Electron Lasers;
 Raman Lasers;
 Wiggler Magnets;
 Fourier Transformation;
 Maxwell Equation;
 Vlasov Equations;
 Wave Equations;
 Lasers and Masers