Abstract-Energy Spectra of Electron Beams and the Possibility of Double-Stage Energy Recuperation in a Double-Beam Terahertz Gyrotron

M. Yu. Glyavin, V. Yu. Zaslavsky, I. V. Zotova, V. N. Manuilov, A. P. Fokin,

https://link.springer.com/article/10.1007/s11141-019-09981-y

We study theoretically the possibilities of double-stage energy recuperation in a double-beam terahertz gyrotron. Numerical modeling, which was performed for a gyrotron producing radiation with a frequency of 0.78 THz and operating at the second cyclotron-frequency harmonic at the TE8.5 mode, demonstrates the possibility of spatial and energy separation of electron beams. This makes it possible to implement a double-stage recuperation scheme. The found energy spectra of electrons suggest an increase in the gyrotron efficiency by 3.5–4 times.

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

Applied Physics Letters

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.