Showing posts with label Yu. K. Kalynov. Show all posts
Showing posts with label Yu. K. Kalynov. Show all posts

Wednesday, June 12, 2019

Abstract-Powerful continuous-wave sub-terahertz electron maser operating at the 3rd cyclotron harmonic

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Yu. K. Kalynov, V. N. Manuilov, A. Sh. Fiks,  N. A. Zavodski
Photo (a), a drawing of the LOG with a cryomagnet (b), and a scheme of the electron-optical system with a magnetic-field reversal (c). Trajectories of particles in the collector region at a fixed time instant (d) and a scheme of the collector coil system (e).

https://aip.scitation.org/doi/abs/10.1063/1.5094875

Coherent subterahertz radiation is achieved in an electron cyclotron maser (large-orbit gyrotron configuration) operating at a higher cyclotron harmonic in the continuous-wave generation regime. This auto-oscillator is based on the use of a gun with a magnetic field cusp and a section for adiabatic magnetic compression with a factor of 1000, forming a 30 keV/0.7 A axis-encircling electron beam in a magnetic field of 5 T. A stable single-mode generation is achieved in the case of operation at the third and second cyclotron harmonics at frequencies of 0.394 THz and 0.267 THz with radiation powers of 0.37 kW and 0.9 kW, respectively.

Friday, January 29, 2016

Abstract-Gyrotron with a sectioned cavity based on excitation of a far-from-cutoff operating mode




A typical problem of weakly relativistic low-power gyrotrons (especially in the case of operation at high cyclotron harmonics) is the use of long cavities ensuring extremely high diffraction Q-factors for the operating near-cutoff waves. As a result, a great share of the rf power radiated by electrons is spent in Ohmic losses. In this paper, we propose to use a sectioned cavity with π-shifts of the wave phase between sections. In such a cavity, a far-from-cutoff axial mode of the operating cavity having a decreased diffraction Q-factor is excited by the electron beam in a gyrotron-like regime.

(This paper is focused basically on the problems of the gyrotrons operating at high cyclotron harmonics in the terahertz frequency range)