Hall thruster plume divergence angle measurement and correction method

Abstract

A Hall thruster plume divergence angle measurement and correction method belongs to the field of Hall thrusters. The invention aims to solve the problem concerning relative error generated at different measurement radiuses during Hall thruster plume divergence angle measurement. The method comprises the following steps: S1, getting an arc measurement value b corresponding to the boundary of plume divergence angle through an arc measurement mode; S2, performing first correction according to the arc measurement value b; and S3, performing second correction according to a formula (a=x1*a'+x2*b+x3), and taking a as the final value of plume divergence angle.

Description

technical field [0001] The invention belongs to the field of Hall thrusters. Background technique [0002] Hall Thruster (Hall Thruster) uses electric energy to ionize the working gas (usually inert gas Xe) to generate plasma, and then uses the electric field formed in the annular channel of the thruster to accelerate the ions out of the channel along the axial direction to obtain power. Electric propulsion. It has the advantages of simple structure, high specific impulse, long life, high reliability, etc. It is suitable for position maintenance, orbit transfer, resistance compensation, deep space exploration, etc. of various spacecraft. It is currently the most widely used and most mature electric propulsion technology in the world. . [0003] There are high-energy ions in the plume of the Hall thruster, and the high-energy ions bombard the surface of the spacecraft, causing sputtering, deposition pollution, and deflection torque on the surface of the spacecraft. one of ...

AI Technical Summary

Problems solved by technology

[0005] The measurement of plume divergence angle needs to approximate the thruster as a point source model, such as figure 2 As shown, due to the difference between the center of rotation of the probe and the point source center of the thruster, the smaller the measurement radius is, the larger the divergence angle of the plume is calculated. figure 2 For example, a'>a”>a, therefore, theoretically, the ion current density measurement point by point within a larger radius range can be used to calculate the real plume divergence angle, but most vacuum systems are limited The diameter size does not have a large measurement radius measurement, so it will bring a large error to the measurement of the plume divergence angle

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