Cyclotron maser experiment in a 2D periodic waveguide

The experimental study of a cyclotron-resonance maser (CRM) in a 2D periodic-waveguide is reported. Using a low-energy electron beam (/spl sim/5 keV, 0.1 A), the experiment is operated in microwave-frequency around 7 GHz in an axial magnetic field (/spl sim/3 kG). The corresponding efficiency is /spl sim/10%. This experiment is a first stage in the development of a new CRM-array concept.