Unequal-weight macro particle correction method of electron collision ionization Monte Carlo model

Abstract

The invention belongs to the field of Monte Carlo simulation of electron collision ionization in a discharge chamber of an ion thruster, and particularly relates to an unequal-weight macro particle correction method of an electron collision ionization Monte Carlo model. According to the method, improvement and correction are carried out according to the collision condition among macro particles with different weights, an ionization collision weight reference value wbm is introduced, the weight of each macro particle participating in ionization collision is split, each macro particle is subdivided into equivalent Nc and j times from one time of collision judgment, and the original collision characteristics are guaranteed to the maximum extent. The actual macro particle weight in each effective ionization collision is controlled to be equal, and the corresponding post-collision macro particle attribute is updated, instead of directly taking any one of two macro particles with unequal weights, so that the non-conservation of charges or energy in the ionization collision process is avoided. The problem that an existing electron collision ionization Monte Carlo model is not suitable for unequal-weight macro particle simulation is effectively solved.

Description

technical field [0001] The invention belongs to the field of Monte Carlo simulation of electron impact ionization in an ion thruster discharge chamber. When using the Monte Carlo model to simulate the electron collision ionization process in the discharge chamber of the ion thruster, in view of the fact that the weights of the macro particles participating in the collision are different in the system, by introducing a reference value of the ionization collision weight, the collision is added when calculating the ionization collision Correction, specifically the unequal weight macro particle correction method of the electron impact ionization Monte Carlo model. Background technique [0002] With the rapid development of aerospace technology, space missions have higher and higher requirements on the working efficiency and working life of space thrusters. Among many aerospace thrusters, ion thrusters have become one of the best-developed and most widely used thrusters due to t...

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned problems or deficiencies, in order to solve the problem that the existing electron impact ionization Monte Carlo model is not applicable in the simulation of non-equal weight macro particles, the present invention provides a non-equal weight macro of the electron impact ionization Monte Carlo model Particle correction method, on the basis of retaining the basic flow of the existing electron impact ionization Monte Carlo model and the non-equal weight characteristics of macro particles in the system, by introducing a reference value of ionization collision weight, the ionization in the calculation collision grid The number of collisions is corrected according to the reference value, and corresponding corrections are made when the properties of the macroparticles participating in the effective ionization collision are subsequently updated. While maintaining the original collision characteristics, the energy conservation and charge of the entire ionization collision process are effectively guaranteed. Conservation

Images