A new device for the production of microwave radiation is proposed. The device exploits the electromagnetic instabilities of nonequilibrium plasmas. The plasma parameters are chosen in such a way as to avoid electrostatic instabilities. The main advantage of the proposed device over other microwave production devices is that in the former case one can achieve very highhyphen;power densities in the active medium and utilize large volume of the same. This opens the way to the generation of much larger amounts of microwave power than before. A linear stability analysis of a homogeneous magnetized plasma having anisotropic velocity distribution shows that a plasma of volume 104cm3immersed in a magnetic field of 1 T and having parallel and perpendicular temperatures of 1 and 2 keV, respectively, is capable of emitting about 0.4 kJ of energy in microwave form in a time span of about 10minus;10s.
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