High wave-band space travelling wave tube PPM structure optimization designing method

Abstract

The invention belongs to the technical field of microwave vacuum electronic devices, and relates to a high wave-band space travelling wave tube PPM structure optimization designing method. According to the invention, by presetting the offset quantity of a magnet ring to be within 0.2mm, and using magnetic field simulation software to simulate a PPM pole shoe structure of offset of the magnet ring,the inner diameter of the pole shoe is reduced, so the symmetry of the magnetic field during asymmetry of the magnet ring can be reduced, the asymmetry of the magnet ring caused by asymmetry of assembly of the magnet ring is improved, the electronic beam flow rate is greatly improved, the asymmetry of the optimized magnetic field is obviously reduced and the fluctuation of the electronic beams isreduced. Compared with the prior art, a preprocessing idea is provided; during design, the PPM structure is optimized, so the asymmetry of the magnetic field caused by asymmetry of the magnet ring caused by assembly is reduced, the electronic beam flow rate is improved, the design cost of the travelling wave tube is reduced and it is facilitated that the travelling wave tube is developed towardshigh wave bands.

Description

technical field [0001] The invention belongs to the technical field of microwave vacuum electronic devices, and relates to a PPM structure optimization design method of a high-band space traveling wave tube. Background technique [0002] Space traveling wave tube is an important core device of national defense equipment such as radar, satellite, and electronic countermeasures. With the rapid development of the national defense industry, the space traveling wave tube is also developing towards the high-band, but the electron optical system is a major technical difficulty of the high-band traveling wave tube. After the wave band of the space traveling wave tube increases, the size of the helix becomes very small , the electron beam channel is very thin, and the interaction part must have a long length, which puts forward high requirements for the focusing system. The PPM structure in the high-wave band is small in size, difficult to process and assemble, and the small asymmet...

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Problems solved by technology

[0003] In the PPM structure, the circular magnetic rings and pole shoes are arranged alternately. The circular magnetic rings are installed on the tube shaft by dividing the magnetic rings into two halves during the assembly of the PPM structure, but this is easy to appear during the assembly process. Assembly error, resulting in asymmetrical magnetic ring

The asymmetry of the assembly of the magnetic ring may cause the magnetic field of the magnetic system to be wrong and cause electrons to be intercepted in the slow wave structure

[0004] At present, there are two ways to adjust the magnetic field asymmetry caused by subsequent assembly: one is to adjust the magnetic system by rotating the magnetic ring without moving the tube; the other is to paste a permanent magnetic sheet or a soft magnetic sheet on the outer surface of the magnetic system to adjust the magnetic field Asymmetry, but this method should not paste too many magnetic sheets, otherwise the entire focusing system will be too large, and may even defocus after a period of time

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