High-current multi-channel metal cathode

A metal cathode, multi-channel technology, applied in circuits, electrical components, discharge tube electron guns, etc., can solve the problems of unsuitable magnetic plasma thrusters, complex cathode structure, difficult system control, etc., so as to reduce the material ablation rate. , the structure and control are simple, the effect of improving the emission current capability
CN106531591AActive Publication Date: 2017-03-22SHANGHAI INST OF SPACE PROPULSION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI INST OF SPACE PROPULSION
Publication Date
2017-03-22

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Abstract

The invention discloses a high-current multi-channel metal hollow cathode, which comprises a cathode tube, multiple metal emitters and an air circuit interface, wherein the cathode tube is a thin refractory metal tube, the multiple refractory metal emitters are arranged at one end of the cathode tube in parallel, the surfaces between the metal emitters and between the metal emitters and the inner wall of the cathode tube are tangent and the other end of the cathode tube is hermetically welded with the air circuit interface. According to the high-current multi-channel metal cathode, multiple emission channels are formed by adopting multiple metal bars or tubes with low work functions and high electron emission ability, the emission area is increased under the condition of a finite size, the emission current capacity is improved, an external heater is not needed, a certain flow of gas working medium is introduced to the inside, certain high voltage is applied to the outside and electron current of 100-500A can be emitted through direct ignition; and the emission current density of unit area does not exceed 10A / cm<2>, thereby greatly reducing the surface temperatures of the emitters and the material ablation rate and prolonging the service life of the hollow cathode and a thruster.
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Description

technical field

[0001] The invention belongs to the field of space propulsion, and in particular relates to a large-current multi-channel metal cathode. Background technique

[0002] Compared with chemical propulsion, electric propulsion has a high specific impulse. It can be widely used in missions such as spacecraft orbit transfer, orbit maintenance, attitude control, drag-free control, and main propulsion for deep space exploration. agents, increase spacecraft life, or reduce onboard requirements. With the development of space propulsion technology, the current mature Hall or ion thrusters have a high specific impulse (1500-3000s), but the thrust is small (40-300mN), which cannot meet the tasks of deep space exploration and manned moon landing. The required propulsion tasks require large thrust (several cattle to tens of cattle) and high specific impulse (6000-10000s). The theoretical value of the specific impulse of the magnetic plasma thruster (MPDT, MagenetoPlasma Dy...

Claims

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