Cathode center layout of Hall thruster

Abstract

The invention discloses a cathode center layout of a Hall thruster. By means of the cathode center layout, the uniformity of plasma in a discharge channel can be improved, the coupling voltage between a cathode and a discharge chamber is reduced, plume neutral loss energy is reduced, and the efficiency of the thruster is effectively improved finally. A cylindrical cavity penetrating through an inner winding column and an inner pole shoe is formed in the inner winding column and the inner pole shoe of an existing Hall thruster structure along the center axis of the Hall thruster first; afterwards, the ampere turns of coils on the inner winding column and an outer winding column of the Hall thruster are adjusted till a magnetic field meeting the requirement of a discharge chamber channel of the Hall thruster is obtained, and the magnetic field of the inner winding column is in an unsaturation state; and finally, a cylindrical cathode body structure is placed in a cavity of the inner winding column, and a ceramic sleeve is installed between the cathode and the cavity of the inner winding column.

Description

technical field [0001] The invention relates to the fields of aerospace technology and low-temperature plasma technology, in particular to a cathode center layout of a Hall thruster. Background technique [0002] The cathode is an important part of the Hall thruster. The electrons emitted by the cathode have two main functions. Some of the electrons enter the channel of the Hall thruster and are used to ionize the working fluid; the other part of the electrons recombine with the beam ions in the plume. , to ensure electrical neutrality in the plume region. A large number of experiments have shown that due to the coupling effect of the cathode and thruster discharge process, the installation position and angle of the cathode have a great influence on the discharge plasma characteristics, thrust macroscopic performance and beam neutralization characteristics of the Hall thruster. [0003] In the Hall thruster structure of the prior art, the cathode is placed outside the disch...

AI Technical Summary

Problems solved by technology

The main problems are as follows: (1) Since the cathode is arranged outside the discharge chamber, the electrons emitted by the cathode cannot evenly enter the discharge channel, and the coupling voltage between the cathode and the discharge chamber is high, which affects the overall efficiency of the thruster; (2) due to The position of the cathode deviates from the central axis of the discharge chamber, and the beam neutralization effect is not ideal, which brings certain difficulties to satellite space plume protection

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