Abstract
The Doppler-shift dominated electron cyclotron autoresonance maser (CARM) is an attractive source of high-power, coherent microwave radiation; it has favourable frequency scaling with electron beam energy, along with the potential for high efficiency. However, one concern has been that the gain, which decreases as ω/k → c, might be too small for practical purposes. It is suggested here that imposing a transverse helical wiggler onto the background solenoidal magnetic field can significantly enhance both the gain and efficiency of the CARM. The wiggler induces an energy-dependent perturbation in the electron orbit, which can be exploited to inhibit parasitic electron autoresonant acceleration. Results from computer simulations using 3-D waveguide particle codes are presented.
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