Abstract
Powerful terahertz masers are required for various important applications, such as heating and current drive in controlled nuclear fusion. Traditional relativistic electron masers are based on emission of a fixed transverse mode of the operating cavity; at terahertz frequencies, oversized cavities are obviously needed, and it is difficult to provide single-mode generation. This study proposes a fresh strategy for solving this problem, based on excitation of a supermode formed by a fixed set of partial transverse cavity modes. The approach is interesting as a means to realize high-power sources of coherent terahertz radiation.
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