Harmonic gyroresonance of electrons in combined helical wiggler and axial guide magnetic fields

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Abstract
[[abstract]]A driven-oscillator model is developed to examine the orbital-velocity harmonics of off-axis electrons in combined helical wiggler and axial guide magnetic fields. The gyroresonance effect is found to occur at harmonics of the wiggler frequency in addition to the well-known fundamental-harmonic resonance. Resonance at the first negative harmonic is potentially important for providing an explanation of the unexpected observations of a recent free-electron-laser experiment. Exploration of the gyroresonance effect as a harmonic selection mechanism for the free-electron laser is discussed[[fileno]]2010126010064[[department]]物理