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A Method of Widening the Range of Hollow Cathode Point Mode Discharge Current

A hollow cathode and discharge current technology, which is applied in the manufacture of discharge tubes/lamps, cold cathode manufacture, circuits, etc., can solve the problems of specific impulse reduction, cathode overheating, and narrow discharge current range of hollow cathode point mode, so as to reduce the temperature Gradient, simple implementation, and the effect of increasing the effective emission area

Active Publication Date: 2018-07-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the hollow cathode point mode discharge current range is narrow, and the traditional method of expanding the hollow cathode point mode discharge current range will reduce the specific impulse of the entire propulsion system and easily cause the cathode overheating. Method for Wide Hollow Cathode Point Mode Discharge Current Range

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  • A Method of Widening the Range of Hollow Cathode Point Mode Discharge Current
  • A Method of Widening the Range of Hollow Cathode Point Mode Discharge Current
  • A Method of Widening the Range of Hollow Cathode Point Mode Discharge Current

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specific Embodiment approach 1

[0021] Specific implementation mode one: combine figure 1 Specifically illustrate this embodiment, a method for widening the hollow cathode point mode discharge current range described in this embodiment, the method includes the following steps:

[0022] Step 1: Design the cathode parts according to the actual needs of the hollow cathode, and initially set the internal movement distance of the orifice;

[0023] Step 2: make the cathode work normally, and measure the working parameters of the hollow cathode;

[0024] Step 3: Optimizing the inward movement distance of the orifice according to the working parameters of the hollow cathode, then making the cathode work normally, and measuring the working parameters of the hollow cathode;

[0025] Repeat step 3 until the optimal orifice internal displacement distance is found.

[0026] Select and design the material and size of the emitter and orifice and the inward distance of the orifice according to actual needs, measure the pa...

specific Embodiment approach 2

[0028] Specific embodiment 2: This embodiment is a further description of a method for widening the range of hollow cathode point mode discharge current described in specific embodiment 1. In this embodiment, the material of the orifice is tungsten, LaB 6 , cerium tungsten, lanthanum tungsten or barium tungsten, etc., the emitter material of the hollow cathode is tungsten, LaB 6 , cerium tungsten, lanthanum tungsten or barium tungsten, etc.

specific Embodiment approach 3

[0029] Specific implementation mode three: combination figure 2 This embodiment is described in detail. This embodiment is a further description of a method for widening the range of the hollow cathode point mode discharge current described in the first or second embodiment. In this embodiment, the length of the emitter of the hollow cathode and The inner diameter is determined according to the electron emission capability of the emitter and the required maximum discharge current, the minimum value of the orifice aperture is determined according to the current density of the through hole, and the maximum value of the orifice aperture is determined according to the gas supply flow rate and the minimum throttle effect required by the cathode .

[0030] figure 2 It is a graph of electron emission current density versus temperature.

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Abstract

The invention provides a method for expanding a point mode discharge current range of a hollow cathode, relates to the technical field of expansion of the discharge current range of the hollow cathode and aims at solving the problem that the point mode discharge current range of the hollow cathode is narrow while the specific impulse of a whole propulsion system is reduced and overheating of the cathode is easily caused in a traditional method for expanding the point mode discharge current range of the hollow cathode. The method comprises the steps of (1) designing cathode parts according to the actual requirements of the hollow cathode and initially setting an internal migration distance of a throttling hole; (2) enabling the cathode to normally work and measuring working parameters of the hollow cathode; (3) optimizing the internal migration distance of the throttling hole according to the working parameters of the hollow cathode, enabling the cathode to normally work and measuring the working parameters of the hollow cathode; and (4) repeating the step (3) until the optimized internal migration distance of the throttling hole is found out. The method is suitable for expanding the point mode discharge current range of the hollow cathode.

Description

technical field [0001] The invention relates to the technical field of widening the discharge current range of the hollow cathode. Background technique [0002] Hollow cathode is an electron source, which is widely used in space electric propulsion technology, plasma processing technology and other fields. The hollow cathode generally uses an inert gas as a working medium, and forms a plasma environment in the inner cavity of the hollow cathode through the ionized gas. When the external potential is high, electrons can be pulled out from the inside of the hollow cathode. The hollow cathode has two working modes, which are point mode and plume mode. Spot mode is characterized by low discharge voltage and small voltage and current oscillations. Correspondingly, the plume mode is characterized by high discharge voltage and large voltage and current oscillations. The previous electric propulsion system was only used in communication satellites to maintain geosynchronous orbi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/02
CPCH01J9/02
Inventor 宁中喜张海广于达仁王亚楠王福锋韩星
Owner HARBIN INST OF TECH