Microwave tube permanent magnet focusing system

Abstract

The invention discloses a microwave tube permanent magnet focusing system, which comprises an electron gun permanent magnet assembly, a collector permanent magnet assembly and an outer ring transitionring, wherein the electron gun permanent magnet assembly sequentially comprises an upper magnetic screen with an opening formed in the center, an upper magnetic ring and an upper magnetic steel outerring; the collector permanent magnet assembly sequentially comprises a lower magnetic screen with an opening formed in the center, a lower magnetic ring and a lower magnetic steel outer ring, and thelower magnetic ring and the upper magnetic ring have opposite magnetizing directions; and the two end parts of the outer ring transition ring sleeve the upper magnetic steel outer ring and the lowermagnetic steel outer ring, one sides, facing the outer ring transition ring, of the upper magnetic steel outer ring and the lower magnetic steel outer ring comprise an upper matching end surface and alower matching end surface in corresponding match with the end surface of the outer ring transition ring, and in the axial direction of the microwave tube, the distance between the upper matching endsurface and the lower matching end surface is larger than the length of the outer ring transition ring. According to the focusing system disclosed in the invention, tunability of the electron beam focusing length and the magnetic field strength of the microwave tube can be realized, and the electron beams are ensured to be focused in an electron beam channel with the diameter of 0.3 to 0.5 mm andthe length of 10 to 20 nm.

Description

Technical field

[0001] The invention relates to the field of microwave tube tooling design, in particular to a microwave tube permanent magnet focusing system. Background technique

[0002] Microwave tube is a kind of power amplifier device that uses the interaction of high-speed electron beam and microwave signal to convert the kinetic energy of electron beam into microwave energy. Microwave tubes are widely used in electronic systems such as missile homing, aerospace measurement and control, target imaging, weather detection, electronic countermeasures, and satellite communications, and are the core power components of radar systems. In radar systems, one or several microwave tubes are usually used as the final power amplifier.

[0003] The interaction of the microwave tube occurs in the interaction system. The electron beam needs to be focused when passing through the interaction system, otherwise the electron beam will immediately diverge due to the repulsive force between the...

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