Direct generation of a circularly polarized TE₁₁ mode in a relativistic backward wave oscillator by loading anisotropic medium

Abstract

A relativistic backward wave oscillator (RBWO) for direct generation of a circularly polarized TE11 mode is proposed. Using a coaxially loaded anisotropic medium with an appropriate longitudinal conductivity, the TM01 mode is effectively suppressed and the TE11 mode successfully stimulated. A dual-resonant reflector is incorporated in the RBWO to effectively reflect the TE11 mode. An isotropic absorber is deployed in front of the dual-resonant reflector to reduce the external Q factor of the TM01 mode and avoid undesired modulation. These distinctive features of the RBWO, allow a circularly polarized TE11 mode output to be obtained. Particle-in-cell simulations show that for a beam voltage of 1.12 MeV and a beam current of 12.3 kA, circularly polarized TE11 mode microwaves with power 3.9 GW and frequency 6.4 GHz can be obtained.

Harmonic generation in magnetized plasma for electromagnetic wave propagating parallel to external magnetic field

“…acceleration [16,17], microwave heated chemical reactions [18] and mirror machines [19,20]. While high-power lasers have already been available for a long time, the production of high-power microwave (HPM) sources is more recent [21][22][23]. In a recent study [23,24], an HPM pulsed source of up to 4.6 GW and of frequency 9.96 GHz has been achieved in experiments.…”

Analysis of Destructive Effects with Electron Bombardment in Slow-Wave Structures

“…Relativistic backward wave oscillator (RBWO) is one of the most promising high-power microwave (HPM) devices owing to its compact structure, high-conversion efficiency, and repetitive operation [1][2][3][4][5][6][7][8]. In the past several decades, many methods have been proposed to continuously improve the power capacity and pulse width of RBWOs, such as the overmoded structures, the more effective resonant reflector, and the surface treating methods [9][10][11][12][13][14].…”