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A free-electron maser based on a new generation of induction linacs capable of forming 5 - 20 MeV / 2 kA / 200 ns electron beams is currently under development. In this work, we study possibilities for realization of powerful THz two-wave oscillators based on the use of the regime of frequency multiplication.

The 30 keV / 0.7 A CW gyrotron is developed for the spectroscopy applications. Recently, selective operation at the second (0.267 THz) and at the third (0.394 THz) cyclotron harmonics was achieved. Special quasi-regular cavities are designed to achieve the fourth-harmonic operation at frequencies of up to 0.65 THz. The pulsed 80-100 keV / 0.7-1.0 A gyrotron is aimed to provide high-power pulses of radiation at the third cyclotron harmonic at frequencies close to 1 THz. Now we study possibilities to increase the peak level of the output power up to the level of several kW in order to use this gyrotron in plasma applications.