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Hall thruster ion energy distribution measuring method and system

A Hall thruster and ion energy technology, which is applied in measurement devices, testing of machine/structural components, instruments, etc., can solve the problems of no practical application value, and it is difficult to obtain the dynamic characteristics of ion energy distribution in the plume.

Active Publication Date: 2017-04-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The low-frequency oscillation characteristics of the Hall thruster will change the ion energy distribution in the plume area. The current measurement method can only measure the plume ion energy distribution of the thruster under steady-state conditions, which has no practical application value. within a few tens of microseconds, it is difficult to obtain the dynamic characteristics of the ion energy distribution in the plume

Method used

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  • Hall thruster ion energy distribution measuring method and system
  • Hall thruster ion energy distribution measuring method and system
  • Hall thruster ion energy distribution measuring method and system

Examples

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Embodiment 1

[0066] Place the multi-grid probe on the central axis of the channel, 75cm away from the outlet section of the channel, and the height is equal to the center of the thruster channel.

[0067] Adjust the stop voltage of the multi-gate probe to U 1 When , the curve L of the ion current received by the multi-gate probe changing with the oscillation period is measured 1 and discharge current curve; adjust the stop voltage of the multi-gate probe to U 2 When , the curve L of the ion current received by the multi-gate probe changing with the oscillation period is measured 2 and discharge current curves until the curves of the ion current changing with the oscillation period and the discharge current curves under the stop voltage of the selected n multi-gate probes are measured. Since the low-frequency oscillation period is almost constant, the fluctuation curves of the discharge current obtained under the stop voltage of each multi-gate probe are similar, so it is assumed that the...

Embodiment 2

[0070] Embodiment 2 of the Hall thruster ion energy distribution measurement system and method of the present invention: the difference between this embodiment and Embodiment 1 is: in the discharge current curve L d A time value is selected at intervals of 0.15 microseconds above, and other measurement processes are the same as in Embodiment 1.

Embodiment 3

[0071] Embodiment 3 of the Hall thruster ion energy distribution measurement system and method of the present invention: This embodiment differs from Embodiment 1 in that the multi-gate probe is 50 cm away from the cross section of the channel exit, and other measurement processes are the same as Embodiment 1.

[0072] Embodiment 4 of the Hall thruster ion energy distribution measurement system and method of the present invention: The difference between this embodiment and Embodiment 1 is that the multi-gate probe is 100 cm away from the cross-section of the channel outlet, and other measurement processes are the same as Embodiment 1.

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Abstract

The present invention discloses a Hall thruster ion energy distribution measuring method and system. According to the method, the curve of the change of ion current of a multi-gate probe under different stopping voltage with the time is measured; current values corresponding to the different stopping voltage at the same time point are obtained, and the function relationship of the current and the voltage at the time point is obtained; an ion average velocity at the time point is obtained, and ion energy at the time point is obtained; ion energy at other time points in an oscillation period is obtained at set time intervals; and the ion energy at different time points is fitted according to a time sequence, so that the curve of the change of ion energy distribution with the time in a low-frequency oscillation period is obtained. With the method and system of the invention adopted, the measurement of the dynamic characteristics of ion energy distribution in a plume area is realized, the change curve of the ion energy distribution in the plume area in the low-frequency oscillation period is obtained; the problem that an existing measurement method cannot obtain the dynamic change of ion energy distribution in a plume area at a magnitude of dozens of microseconds with the time can be solved; and an effective technique means is provided for the study of Hall thruster plume area ion energy distribution change.

Description

technical field [0001] The invention relates to the field of plasma propulsion, in particular to a method and system for measuring ion energy distribution of a Hall thruster. Background technique [0002] Since the Hall thruster was successfully developed in 1970, it has been widely used in space propulsion tasks such as satellite position maintenance and orbit transfer due to its advantages of high efficiency, high specific impulse and high reliability. Hall thruster plumes generally consist of electrons, low-energy ions generated by charge exchange of high-energy ions, and neutral atoms. Among them, high-energy ions collide with the surface of the spacecraft to cause sputtering and erosion, and the sputtered substances will pollute sensitive surfaces such as solar panels on the spacecraft, thereby degrading or failing their performance. At the same time, the high-energy ions directly collide with the sensitive surface, causing the sensitive surface to be damaged and the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/00G01M15/02
CPCG01M15/00G01M15/02
Inventor 魏立秋丁永杰李文博于达仁
Owner HARBIN INST OF TECH