One of the highest power device technologies for the generation and amplification of power in the millimeter wave bands (30–300 GHz) are the cyclotron resonance devices.

In cyclotron resonance devices (gyrotrons, gyro klystrons, gyro traveling-wave tubes, and gyro backward-wave oscillators), the electrons in the electron beam have substantial motion perpendicular to the axis of the beam and the solenoidal focusing magnetic field. They interact with radio-frequency electric fields perpendicular to the magnetic focusing field. The RF fields correspond to the fields of TE modes in cavities that, to a first approximation, are cylindrical, and the operating modes need not be the fundamental mode of the cavity. ...

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