WANG HAILING, CHEN JIANWEN. Free-electron coherent radiation in axial and helical magnetic fields[J]. Acta Optica Sinica, 1984, 4(9): 791
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A detailed discussion is made on phase-space motion equations and radiation field equations for free-electrons near the magnetic resonance in the axial and helical magnetic fields. Red-shift spectral broadening and gain enhancement for free-electron radiation are obtained near magnetic resonance. Our theory is applicable to variable periodic and taper helical wiggler fields.