Abstract

In order to develop compact,reliable and high power terahertz radiation sources,multi-mode second-harmonic operation in a terahertz gyrotron was investigated theoretically and experimentally.The theoretical calculation results show that there are five second-harmonic modes which operate at single-mode oscillation state in the gyrotron by adjusting the design parameters.Experimental results demonstrated that there are four second-harmonic modes(TE16,TE64,TE46 and TE26) in the gyrotron operating with a 1.5A/41kV electron beam.Output powers of 1.5,2.1,3.0 and 1.4 kW can be generated at the corresponding frequencies of 0.391,0.404,0.416 and 0.423 THz,respectively.

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