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Plasma sheath curvature measurement method of ion thruster

An ion thruster and plasma technology, applied in the directions of plasma and electrical components, can solve the problem of not considering the curvature of the plasma sheath, and achieve the effect of ensuring measurement accuracy

Inactive Publication Date: 2017-12-15
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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Problems solved by technology

Currently, the design of the ion thruster grid system does not take into account the effect of the curvature of the plasma sheath

Method used

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  • Plasma sheath curvature measurement method of ion thruster
  • Plasma sheath curvature measurement method of ion thruster

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Embodiment Construction

[0021] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0022] The invention provides a method for measuring the curvature of the plasma sheath of an ion thruster. The basic principle is to measure the plasma density based on the fact that the plasma density on the curved surface of the sheath is everywhere equal and the plasma density at the downstream adjacent position changes abruptly, so as to find out Sheath surface, and get the sheath curvature.

[0023] Such as figure 2 Shown is the plasma sheath curved surface measuring device of the present invention. The measuring device consists of a gas supply device, a mass flow meter, a Langmuir probe, a Faraday probe, a three-dimensional precision moving motor, and a control and data processing unit.

[0024] The measurement implementation steps are as follows:

[0025] Step 1. Change the gas flow rate of the high-purity xenon gas provided externally and dete...

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Abstract

The present invention discloses a plasma sheath curvature measurement method of an ion thruster. The method employs equal plasma density on a sheath curved surface and the plasma density jump at adjacent positions of an ion beam downstream to measure the plasma density so as to find out the sheath curved surface and obtain a sheath curvature. The present invention can provide a method for obtaining a plasma sheath curved surface so as to complete the ion thruster grid system design method and make up the problem that the design of the ion thruster grid system does not consider the plasma sheath curvature influence.

Description

technical field [0001] The invention relates to the field of grid system design of an ion thruster, in particular to a method for measuring the curvature of a plasma sheath of an ion thruster. Background technique [0002] Achieving ultra-high specific impulse has always been the focus of ion thruster development. The two-stage ion acceleration technology can greatly increase the specific impulse of the ion thruster. The dual-stage ion acceleration system consists of four grids, which are screen grid, extraction grid, acceleration grid and deceleration grid. During the working process of the ion thruster, a certain density of plasma will be generated in the discharge chamber, and the plasma will generate a plasma sheath near the screen grid downstream of the discharge chamber. Since the screen grid is a porous structure, and a positive potential is applied to the screen grid and the extraction grid, the electric field will penetrate into the discharge chamber. Under the c...

Claims

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Application Information

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IPC IPC(8): H05H1/00
CPCH05H1/0081
Inventor 贾连军张天平刘明正贾艳辉陈娟娟杨乐龙建飞
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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