Numerical Simulation Method of Microwave Gas Discharge in Waveguide Devices

Abstract

The invention discloses a microwave gas discharge numerical simulation method of a waveguide device. The method establishes a fluid model of a microwave gas discharge in a waveguide structure, and performs accurate numerical simulations of electron density, electron fluid velocity and average electron energy in the process of gas breakdown. Through the analysis, the law of electric field intensity and electron density at different observation points with time can be obtained in the case of gas discharge in complex structure waveguide devices with different geometric shapes. Based on the time-domain spectral element method, the present invention can realize the modeling of waveguide devices with arbitrary complex structures; the generated mass matrix is ​​a block diagonal matrix, and the inverse matrix can be directly obtained, which greatly reduces the calculation time; at the same time, the method of numerical simulation can Avoid repeated experiments to obtain the internal electric field distribution and electron density of waveguide devices, obtain the breakdown threshold, shorten the design cycle, and save design costs. It is very suitable for effective simulation design and numerical simulation of complex waveguide devices with discontinuous structures .

Description

technical field [0001] The invention belongs to the simulation technology of electromagnetic characteristics involving multiple physical fields, in particular to a novel numerical simulation method for analyzing gas discharge breakdown of waveguide structure microwave devices. Background technique [0002] With the rapid development of space technology, the circuit integration of electronic equipment is getting higher and higher, and the operating frequency of microwave devices is constantly increasing; at the same time, with the continuous maturity of high-power pulse generator technology, its output power can reach the order of tens of Gw. The numerical analysis and computer simulation of the microwave breakdown and gas discharge phenomena of microwave devices with different gas-filled space waveguide structures are increasingly valued by scientific research institutions, and it is one of the hot problems in the field of space technology and high-power pulses. The research...

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Problems solved by technology

Compared with the long period and high cost of the experimental method, the prediction by the numerical method faces difficulties such as complex structure of the solution object, high nonlinearity, long calculation time and low calculation accuracy.

[0003] At present, the analysis method of microwave breakdown and gas discharge mainly adopts the time-domain finite difference method in the differential equation method, such as literature 1. Yee, Jick H., et al, "Propagation of intense microwave pulses in air and in a waveguide, "IEEE Transactions on Antennas and Propagation, 39.9 (1991), pp:1421-1427. and finite volume integration method, such as literature 2. Adnane Hamiaz, et al," Finite VolumeTime Domain modeling of microwave breakdown and plasma formation in metallic aperture, "Computer Physics Communications 183(2012), pp:1634–1640. The above-mentioned published documents are all used to analyze the two-dimensional gas discharge problem with simple structure. Although the numerical distribution and prediction of the electric field and electron density of the simple problem can be given, but There are disadvantages such as simple model, low accuracy, and long calculation time

At present, there are no literature reports on the simulation of gas discharge phenomena in waveguide structures using the time-domain spectral element method

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