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Second harmonic waveguide free electron lasers (FELs) have been shown to be capable of both effective electron energy reduction and large interaction gain in the X-band region. In this paper, we consider the extension of this unconventional waveguide FEL scheme into the millimetre-wave region. Through assessment of their resonant conditions, small-signal gain, energy spread effects, and amplification...
Second harmonic waveguide free electron lasers (FELs) have recently been considered as an electron energy reduction technique for compact waveguide FELs operated from microwave to the far-infrared. As their gain mechanism is based on a strong coupling between the oscillatory component of the axial electron velocity and the axial electric field of TM modes in a cylindrical waveguide, second harmonic...
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