Relativistic backward wave oscillator for generating linearly polarized TE11 mode directly

Abstract

The invention, which belongs to the maser field, directly relates to a relativistic backward wave oscillator for generating a linearly polarized TE11 mode directly. The relativistic backward wave oscillator comprises an arc cathode, a reflector, an angular partition slow wave structure, an output waveguide and a magnetic field coil. The arc cathode is arranged at the front end of the relativistic backward wave oscillator; the reflector, the angular partition slow wave structure, and the output waveguide are arranged at the rear side of the arc cathode successively; and the magnetic field coil is installed at the periphery. According to the invention, with the nonaxisymmetrical arc cathode and the angular partition slow wave structure, the TE11 mode is excited directly. The reflector employs the dual-premodulation-cavity unit preferably and is used for carrying out premodulation on an arc relativistic electron beam and leaking the part of TE11 mode to enter the arc cathode zone, so that certain premodulation of the electron beam at the arc cathode zone is realized and thus the beam wave conversion efficiency is improved. Moreover, the oscillator has advantages of simple structure and high conversion efficiency; and the linearly polarized TE11 mode can be generated directly.

Description

technical field [0001] The invention belongs to the field of microwave masers, in particular to a relativistic return wave tube. Background technique [0002] The relativistic backward wave oscillator (hereinafter referred to as RBWO) has the characteristics of high power, high efficiency, and suitable for repetition frequency operation, and is one of the most important high-power microwave sources. Currently commonly used RBWO such as figure 1 As shown (patent number: ZL200710082042.4, high power relativistic return wave tube), it includes a ring cathode 6, a resonant reflector 7, a slow wave structure 8, an output waveguide 4 and a magnetic field coil 5. The ring cathode 1 is located at the front of the device, the resonant reflector 7, the slow wave structure 8 and the output waveguide 4 are separated from the ring cathode 6 by a certain distance, and placed behind it in turn, and the magnetic field coil 5 is located at the ring cathode 6, the resonant reflector 7 and th...

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Problems solved by technology

However, the structure of the Bragg reflector used is complex and difficult to process; in order to ensure sufficient mode conversion, the Bragg reflector must have multiple periods, and its length is equivalent to or even longer than that of the slow wave structure, resulting in the overall failure of the magnetic field coil and the return wave tube. lengthened; in addition, the Bragg reflector affects the modulation of the electron beam, resulting in the TM in the electron beam and the slow wave structure 01 Mode interaction efficiency is low, only 16.5%

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