Small-size and miniwatt hollow barium-tungsten cathode

A hollow cathode, barium tungsten technology, applied in the field of electric propulsion, can solve the problems of low power, unsuitable body size, low emission current, etc., and achieve the effects of good sealing effect, easy deformation and high reliability

Active Publication Date: 2016-07-20
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional hollow cathodes are not suitable for low-power electric thrusters in terms of power and size, so ...

Method used

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  • Small-size and miniwatt hollow barium-tungsten cathode
  • Small-size and miniwatt hollow barium-tungsten cathode
  • Small-size and miniwatt hollow barium-tungsten cathode

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Embodiment Construction

[0025] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0026] The present invention is a barium tungsten hollow cathode, such as figure 1 , figure 2 As shown, the whole is a segmented cylindrical structure, using a closed contact stage 7 and an armored heater (the ceramic heater 10 is an armored heater), and the barium-tungsten hollow cathode is installed on the outside of the Hall thruster , the axes of the two are in the same plane and form a certain angle.

[0027] Barium tungsten hollow cathode includes contact stage 7, heat shield 8, ceramic heater 10, heater jacket 9, barium tungsten emitter 12, cathode tube 11, graphite block 13, tungsten spring 14, cathode tube ceramic sleeve 15, ceramic Block piece 16, ceramic flange 18, bottom flange 19, graphite gasket 17, second bolt ceramic sleeve 5, first bolt insulating sleeve 6, first bolt 2, second bolt 3, first nut 1, second nut 4.

[0028] The cath...

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Abstract

The invention discloses a small-size and miniwatt hollow barium-tungsten cathode for an electric thruster. Barium-tungsten emissive material conducts thermionic emission through external heating. The small-size and miniwatt hollow barium-tungsten cathode is small and compactly structured, is mainly applied to low-power Hall thrusters and ion thrusters, and can provide high energy electrons for ionization of propellant and neutralize plume flows of the thrusters. A sidewise hole of a ceramic separation blade is used for introducing a heating wire, and a cathode pipe ceramic sleeve prevents contact of the wire and a cathode pipe to prevent short circuit due to contact of the wire and the cathode pipe. When the heating wire heats an emitter to 1100 DEG C, high voltage is applied on a contact holding stage for igniting. After successful ignition, the heating wire can be turned off and a self-holding heating mode is on. Electrons generated in the hollow cathode are sprayed to a high potential area on the downstream of the cathode, thereby completing thermionic emission.

Description

technical field [0001] The invention belongs to the field of electric propulsion, and relates to a hollow cathode that utilizes external heating to make barium-tungsten emission materials emit thermal electrons. Background technique [0002] Electric propulsion is a kind of advanced propulsion method that uses electric energy to directly heat the propellant or ionizes and accelerates the propellant to obtain propulsion power. It has high specific impulse, thrust and efficiency. It has broad application prospects in space missions such as space navigation and interstellar navigation. [0003] In some electric thrusters, such as Hall thrusters and ion thrusters, the hollow cathode is placed outside (or inside) the thruster and is an independent component of the thruster, which mainly provides high-energy electrons for the ionization of the propellant and Neutralizes the ion plume. Since the hollow cathode is the component with the highest plasma density, the highest current ...

Claims

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Application Information

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IPC IPC(8): H01J1/88H01J1/22
CPCH01J1/22H01J1/88
Inventor 汤海滨姜逸伟任军学曹帅
Owner BEIHANG UNIV
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