Experimental study of a THz band double-beam gyrotron

In this paper, we present the preliminary results of an ongoing experimental study of a novel double-beam gyrotron, which has been designed to operate in CW regime on the second harmonic of the cyclotron resonance with a frequency of 0.79 THz. A number of fundamental and second harmonic modes can be excited in the frequency range 0.3-0.8 THz. The observed output power levels of the order of several tens watt are available at the second harmonic of cyclotron resonance for application of this tube as a powerful radiation source for a high-field 1.2 GHz, proton DNP-NMR spectroscopy.