Abstract
We study the possibility to develop a high-power free-electron maser amplifier with an operating frequency of 30 GHz to be used in particle acceleration experiments. Various operation regimes are considered, which are capable of ensuring a wide instantaneous amplification band with a high electron efficiency. It is shown that it is possible to achieve a gain ratio of more than 25 dB and an output power of 20 MW in a frequency band with a width of up to 20% of the operating frequency in the so-called dispersion curve contact regime by using a moderately relativistic electron beam formed by the LIU-3000 induction accelerator in an undulator with a regular winding. Application of the profiled undulator allows one to achieve a radiation power of up to 50 MW in a band having a width of more than 50% of the operating frequency in the regime of non-resonant trapping and deceleration of particles.
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