Discontinuous field matching method for general beam-wave interaction model of traveling wave tube

Abstract

The invention discloses a discontinuous field matching method for a general beam-wave interaction model of a traveling wave tube. The method comprises the following steps of S1, solving passive high-frequency field axial distribution e1 and e2 and transmission power p1 and p2 in a structural cycle; S2, performing phase retrieval on e1 and e2 to obtain e10 and e20; S3, performing periodic phase extension on e10 to obtain passive high-frequency field axial distribution E1 of an l1 section; S4, performing phase matching on a field at a jump cross section to obtain a field distribution parameter,with a continuous phase, of a high-frequency field axial component at the jump cross section; S5, performing power and reflection matching on the field at the jump cross section to obtain a passive high-frequency field axial distribution parameter of an l2 section in one structural cycle; and S6, performing periodic phase extension on the parameter obtained in the step S5 to obtain field distribution E2. Through the phase, power and reflection matching and phase extension methods, the field distribution of a whole interaction region is obtained, so that the general beam-wave interaction theoretical model can simulate the beam-wave interaction problem of the traveling wave tube adopting a high-frequency structure with dynamic phase velocity jump.

Description

technical field [0001] The invention belongs to the simulation technology of traveling wave tubes, and relates to an improvement of a simulation method for injection wave interaction of traveling wave tubes, in particular to a discontinuous field matching method for a general injection wave interaction model of traveling wave tubes. Background technique [0002] Traveling wave tubes are currently the most widely used electric vacuum devices. Because of their wide frequency bandwidth and high power, they are widely used in satellite communications, electronic countermeasures and other fields. Computer-aided design (CAD) technology has the advantages of rapidity and cost saving. Today, microwave tube CAD software has become an important tool for the design and optimization of traveling wave tubes. The injection-wave interaction process of TWT is the core of TWT's work. How to accurately simulate the interaction process through numerical methods is an important research area of...

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Problems solved by technology

[0003] At present, the software for simulating injection-wave interaction in traveling wave tubes is mainly divided into two categories. One is large-scale commercial electromagnetic simulation software using particle simulation method, which has wide applicability and high accuracy but takes too long to calculate.

The second is the special software independently developed by the microwave tube research unit. It is based on the parameter theory model and the calculation speed is very fast. Tubes such as terahertz traveling wave tubes and ribbon beam traveling wave tubes, it is difficult to establish an effective theoretical model of beam interaction parameters

However, in order to improve the interaction efficiency of electrons, the design of practical traveling wave tubes usually introduces the method of phase velocity gradient and phase velocity jump, which makes the entire high-frequency structure of the traveling wave tube no longer uniformly distributed. The general theoretical model Traveling wave tubes with non-uniform distribution of these high-frequency structures cannot be simulated

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