"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 11, 2017

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3D simulations of a Ka-band gyro-TWT with power up to 10 kW from the cathode to the end of interaction space


S. V. Samsonov 1, G. G. Denisov 1,2, S. V. Mishakin 1 

1 Institute of Applied Physics, Russian Academy of Sciences, 603950, Nizhny Novgorod, 46 Ulyanov St.

2 Nizhny Novgorod State University, 603950, Nizhny Novgorod, 23 Gagarin Av.


The paper is received on October 29, 2017


Abstract. Results of theoretical analysis of a Gyro-TWT with helically corrugated waveguide of 10-mm wavelength range are presented. The peculiarities of the presented Gyro-TWT variety are the use of a single barrier dielectric window (both for input and output of the microwave radiation), “warm” magnet with a power consumption of about 15 kW, as well as a relatively low-voltage (25 kV*2 A) DC power supply. Construction and technology of the manufacturing of such an amplifier appear to be quite similar to those of so-called technological gyrotron-oscillators that are reliable devices and used for numerous applications. 3D full electromagnetic computer modeling of the most important part of the device starting from the emitter of an electron beam and ending by significant downturn of the axial magnetic field bordering the beam-wave interaction space was performed for the first time. At the input power in the range of 10-50 W, the gyro-TWT was simulated to yield the output power of about 10 kW at the instantaneous bandwidth of 1 GHz or 3-5 kW at the bandwidth of 2 GHz depending on the tuning of the static magnetic field. The system was analyzed with respect to the most expected 3D imperfection in the form of the cathode axis radial shift. It was found that the critical axis shift amounted to about 0.5 mm at which the bandwidth was significantly reduced and the amplifier could start to oscillate.

Key words: gyrotron-type device, gyrotron travelling-wave tube, gyro-TWT, gyro-TWT with helically corrugated waveguide, 3D Finite-Difference Time-Domain Particle-in-Cell (FDTD PIC) simulations.


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For citation:

S.V. Samsonov, G.G. Denisov, S.V. Mishakin. 3D simulations of a Ka-band gyro-TWT with power up to 10 kW from the cathode to the end of interaction space. Zhurnal Radioelektroniki - Journal of Radio Electronics, 2017, No. 11. Available at http://jre.cplire.ru/jre/nov17/10/text.pdf. (In Russian)