Abstract
It has been investigated theoretically1 that a relativistic electron beam with finite transverse dc momentum passing through a region of combined uniform solenoidal and longitudinal wiggler magnetic fields is capable of generating coherent radiation at frequency Ω≈2γ where w C and V 0 are respectively the electron cyclotron frequency and electron axial velocity, but the energy conversion mechanism is concluded to be a low efficiency process. The output frequency is uneable and is higher than either a free electron laser with the same wiggler wave number or a Doppler-shift dominated cyclotron maser with the same solenoidal field. On the other hand, it has been shown through computer simulations2 that a Doppler-shift dominated cyclotron maser can convert 25% of the beam kinetic energy into coherent radiation. In this paper we carry out computer simulations to demonstrate that using the magnetic configuration described above also has potential to achieve high efficiency.
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