"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki)  ISSN 1684-1719, N 2, 2019

contents of issue      DOI  10.30898/1684-1719.2019.2.6     full text in Russian (pdf)  

Simulation of high-current relativistic gyrotron on longitudinally slotted cavity TM-mode

 

M. N. Vilkov1, A. N. Leontyev1, R. M. Rozental1, V. P. Tarakanov2,3 

1 Institute of Applied Physics, Russian Academy of Sciences, 46 Ul'yanov st., 603950, Nizhny Novgorod, Russia

2 Moscow Engineering Physics Institute, 31 Kashirskoe sh., 115409, Moscow, Russia

3 Joint Institute for High Temperatures, Russian Academy of Sciences, 13 Izhorskaya st. Bd.2, 125412, Moscow, Russia

 

The paper is received on January 30, 2019

 

Abstract.  Pulse gyrotrons with relativistic helical electron beams, formed by explosive emission cathodes, are promising sources of electromagnetic radiation of the millimeter wavelength range with output power level in the hundreds of megawatts. However, an increase of the working current of the electron beam above a certain value, while maintaining the working cavity mode, leads to a significant decrease of gyrotrone efficiency due to the rebunching of electrons. Thus, the maximum power and maximum efficiency regimes in the gyrotron may not significantly overlap. The solution to this problem can be found in lowering the coupling coefficient of the electron beam with the high-frequency field due to the use of transverse magnetic working mode. In this paper calculation results for the Ka-band high-current relativistic gyrotron on TM-mode are presented. A cavity formed by separate longitudinal metal plates with slots between them was used to discriminate parasitic TE-modes in the gyrotron. It is shown that in a system of this type, compared to the traditional solid cavity, the TM-modes structure remains practically unchanged, while the TE-modes are radiated through the slots. The possibility of selective exciting of the TM51 mode with output power of more than 230 MW in such structure was demonstrated using the PIC-simulation with the 3D KARAT code.

Keywords: gyrotron, millimeter-wave radiation, high-current relativistic electron beams.

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For citation:

M. N. Vilkov, A. N. Leontyev, R. M. Rozental, V. P. Tarakanov. Simulation of high-current relativistic gyrotron on longitudinally slotted cavity TM-mode. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2019. No. 2. Available at http://jre.cplire.ru/jre/feb19/6/text.pdf

DOI  10.30898/1684-1719.2019.2.6