A device for adjusting the measuring point of the plasma diagnostic probe in the ion thruster discharge chamber

Abstract

The invention discloses a device used for adjusting detection points of an ion thruster discharge chamber plasma diagnosis probe, which comprises a guide rail, a sealing piece group and a probe sleeve, and is characterized in that the guide rail is provided with two check blocks which are used for restraining the sealing piece group; the sealing piece group has six sealing pieces in total with the widths being identical and the lengths being increased sequentially, the shortest sealing piece is provided with a circular groove at the middle, and the remaining sealing pieces are provided with rounded rectangular holes with the widths being identical and the lengths being increased sequentially at the middle; and axial movements of the probe sleeve along a discharge chamber and sealing for the wall of the discharge chamber are realized through matching between the probe sleeve and the sealing piece group. By utilizing the device disclosed by the invention, continuous adjustment for axial and radial detection points of the probe in the discharge chamber can be completed under the condition of not turning off an engine and a vacuum system, and sealing for the wall of the discharge chamber is realized at the same time.

Description

technical field [0001] The invention belongs to the technical field of plasma distribution diagnosis in a discharge chamber of an ion thruster, and relates to a device for adjusting the measuring point of a plasma diagnosis probe in a discharge chamber of an ion thruster, which can realize the installation, sealing, axial and radial direction of the probe. Continuous adjustment of position. Background technique [0002] The ion thruster is a kind of electric thruster. Its specific impulse is high, which can save a lot of propellant and improve the payload of the spacecraft. In addition, the ion thruster also has the characteristics of long working time, safety and environmental protection. At present, it has a wide range of applications in spacecraft north-south position maintenance, orbit control and deep space exploration. The ion thruster uses the ionization of the propellant in the discharge chamber to generate ions, which are accelerated and ejected under the action o...

AI Technical Summary

Problems solved by technology

This method has two obvious disadvantages: one is that the thruster and the vacuum system must be turned off to adjust the axial measuring point, which not only wastes time, but also makes it difficult to make the thruster work under the same working conditions; The position of the measuring point is limited by the small hole, and the distance between the measuring points is relatively large, which affects the accuracy of the diagnosis result

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