CN106373842A - Method for expanding point mode discharge current range of hollow cathode - Google Patents
Method for expanding point mode discharge current range of hollow cathode Download PDFInfo
- Publication number
- CN106373842A CN106373842A CN201610959108.2A CN201610959108A CN106373842A CN 106373842 A CN106373842 A CN 106373842A CN 201610959108 A CN201610959108 A CN 201610959108A CN 106373842 A CN106373842 A CN 106373842A
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- hollow cathode
- discharge current
- tungsten
- throttle orifice
- dot pattern
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 claims description 8
- WMTSAHAFZXEJBV-UHFFFAOYSA-N [Ba].[W] Chemical compound [Ba].[W] WMTSAHAFZXEJBV-UHFFFAOYSA-N 0.000 claims description 6
- IADRPEYPEFONML-UHFFFAOYSA-N [Ce].[W] Chemical compound [Ce].[W] IADRPEYPEFONML-UHFFFAOYSA-N 0.000 claims description 6
- FAYUQEZUGGXARF-UHFFFAOYSA-N lanthanum tungsten Chemical compound [La].[W] FAYUQEZUGGXARF-UHFFFAOYSA-N 0.000 claims description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical group [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052721 tungsten Inorganic materials 0.000 claims description 6
- 239000010937 tungsten Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 1
- 238000013508 migration Methods 0.000 abstract 3
- 230000005012 migration Effects 0.000 abstract 3
- 238000013021 overheating Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- -1 lab6 Chemical compound 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052756 noble gas Inorganic materials 0.000 description 1
- 150000002835 noble gases Chemical class 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Plasma Technology (AREA)
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
The present invention relates to the technical field of broadening hollow cathode discharge current range.
Background technology
Hollow cathode is a kind of electron source, is widely used in the fields such as space electric propulsion technology, plasma processing techniques.
Hollow cathode generally uses noble gases as working medium, forms plasma environment by ionized gas in hollow cathode inner chamber.
Pull-out electronics when extraneous potential is higher so that it may inside hollow cathode.Hollow cathode has two kinds of mode of operations, respectively puts mould
Formula and plume pattern.The feature of dot pattern is that discharge voltage is low, and voltage and current vibration is little.Corresponding, the feature of plume pattern
It is that discharge voltage is high, voltage and current vibration is big.Electric propulsion system in the past, only applies and keeps in communications satellite geo-stationary orbit.
The thrust variation scope of system is little, and the discharge current of hollow cathode is substantially stationary.Developed full electric propulsion platform at present it is simply that
On the basis of original track holding task, increased one and target object is risen to needed for work from near-earth low orbit
Remote ground high orbit.Power needed for lifting track is more than power when track keeps, and the discharge current of therefore negative electrode greatly increases.
The hollow cathode that this will demand perfection the outfit of electric propulsion platform has the ability of interior change discharge current on a large scale.And work as discharge current
During change, the mode of operation of hollow cathode can be changed between dot pattern and plume pattern.Plume pattern can produce energetic ion,
Corroding cathode part, also can consume accelerating potential, reduce system thrust.Negative electrode plume pattern is coupled together and can reduce with electromotor
The stability of system, or even cause engine misses.Therefore broadening hollow cathode dot pattern discharge current scope is that research is hollow
One of key technology of negative electrode.
The method of conventional Extension hollow cathode dot pattern discharge current scope is to increase air demand: increases gas supply flow permissible
So that the discharge voltage of hollow cathode is reduced, be conducive to maintaining dot pattern work.Because hollow cathode does not carry in electric propulsion system
Arch thrust, increasing supply can make the specific impulse of whole propulsion system reduce.In addition, after gas supply flow increases, plasma can be pushed away
To negative electrode throttle orifice, plasma heating effect herein strengthens, and effective transmitting length of emitter shortens, and thermograde increases
Plus, it is very easy to cause negative electrode overheated, bring baptism to the parts material and life-span of negative electrode.
Content of the invention
The invention aims to solving hollow cathode dot pattern discharge current narrow range, and conventional Extension hollow cathode
The method of dot pattern discharge current scope can make the specific impulse of whole propulsion system reduce and easily cause the overheated problem of negative electrode, thus
A kind of method of broadening hollow cathode dot pattern discharge current scope is provided.
A kind of method of broadening hollow cathode dot pattern discharge current scope of the present invention, the method includes following step
Rapid:
Step one: according to hollow cathode actual demand design negative electrode part, and initial setting throttle orifice inset from；
Step 2: make negative electrode normal work, measure hollow cathode running parameter；
Step 3: according to hollow cathode work layout throttle orifice inset from, then make negative electrode normal work, measurement
Hollow cathode running parameter；
Repeat step three, until find optimum throttle orifice inset from.
Preferably, the material of throttle orifice is tungsten, lab6, cerium tungsten, lanthanum tungsten or barium tungsten, the material of the emitter of hollow cathode
For tungsten, lab6, cerium tungsten, lanthanum tungsten or barium tungsten.
Preferably, the length of the emitter of hollow cathode and internal diameter according to the electron emissivity of emitter and required
Big discharge current determines, the minima in throttle orifice aperture determines according to via electric current density, the maximum in throttle orifice aperture according to
Needed for gas supply flow and negative electrode, minimum restriction effect determines.
Preferably, throttle orifice inset from scope be hollow cathode emitter total length 20%-50%.
Preferably, the current range of hollow cathode is 5a-200a.
Preferably, the scope of negative electrode gas supply flow is 2sccm-50sccm.
The present invention reduces thermograde and electron emission task is distributed to throttling in the hole by changing throttling hole site
Outer two parts emitter.According to actual current range requirement, reasonable distribution electron emission task, optimize the electronics by throttle orifice
Current ratio, the method for extension dot pattern discharge current scope.Ensure in required current range, both will not be because of electric current hour
Plasma heating energy is not enough and extinguish, also will not because of electric current big when cathode temperature too high.
Beneficial effects of the present invention: the present invention proposes one kind and utilizes interior shifting throttle orifice, reduce emitter thermograde, increase
The method obtaining broader dot pattern discharge current scope added with effect emission area, the method is implemented simple it is not necessary to increase cloudy
Pole gas supply flow.
The present invention is applied to broadening hollow cathode dot pattern discharge current scope.
Brief description
Fig. 1 is the stream of a kind of method of broadening hollow cathode dot pattern discharge current scope described in specific embodiment one
Cheng Tu；
Fig. 2 is the curve chart of the electron emission current relationship between density and temperature in specific embodiment three；
Fig. 3 is the hollow cathode test system in specific embodiment five；1 is throttle orifice, and 2 is barometer.
Specific embodiment
Specific embodiment one: illustrate present embodiment with reference to Fig. 1, one kind broadening described in present embodiment is hollow
The method of negative electrode dot pattern discharge current scope, the method comprises the following steps:
Step one: according to hollow cathode actual demand design negative electrode part, and initial setting throttle orifice inset from；
Step 2: make negative electrode normal work, measure hollow cathode running parameter；
Step 3: according to hollow cathode work layout throttle orifice inset from, then make negative electrode normal work, measurement
Hollow cathode running parameter；
Repeat step three, until find optimum throttle orifice inset from.
The material of selection design emitter and throttle orifice and size and throttle orifice inset are from measurement is empty according to the actual requirements
The parameter such as heart cathode gas pressure and discharge current, according to flash-over characteristic optimize throttle orifice inset from.
The change by heat source position for the present embodiment, increases and effectively launches length, broaden the scope of work.
Specific embodiment two: present embodiment is to a kind of broadening hollow cathode point mould described in specific embodiment one
The method of formula discharge current scope is described further, and in present embodiment, the material of throttle orifice is tungsten, lab6, cerium tungsten, lanthanum tungsten
Or barium tungsten etc., the material of the emitter of hollow cathode is tungsten, lab6, cerium tungsten, lanthanum tungsten or barium tungsten etc..
Specific embodiment three: illustrate present embodiment with reference to Fig. 2, present embodiment is to specific embodiment one
Or a kind of method of the broadening hollow cathode dot pattern discharge current scope described in two is described further, in present embodiment,
The length of the emitter of hollow cathode and internal diameter determine according to the electron emissivity of emitter and required maximum discharge current, section
The minima of orifice aperture determines, the maximum in throttle orifice aperture is according to needed for gas supply flow and negative electrode according to via electric current density
Minimum restriction effect determines.
Fig. 2 is the curve chart of electron emission current relationship between density and temperature.
Specific embodiment four: present embodiment is to a kind of broadening hollow cathode described in specific embodiment one or two
The method of dot pattern discharge current scope is described further, in present embodiment, throttle orifice inset from scope be hollow
The 20%-50% of the emitter total length of negative electrode.
Specific embodiment five: illustrate present embodiment with reference to Fig. 3, present embodiment is to specific embodiment one
Or a kind of method of the broadening hollow cathode dot pattern discharge current scope described in two is described further, in present embodiment,
According to shifting degree in estimation, processing length is that the emitter of 20%, 30% and the 50% of emitter total length is tested；
Select processing emitter and throttle orifice according to mission requirements first, assemble negative electrode, then allow hollow cathode in such as Fig. 3
Shown hollow cathode test system and test, in contrast difference, the characteristic of shifting degree, selects preferred plan.
Mission requirements current range is 2a-10a, and gas supply flow is 3sccm-5sccm.Select lab6As emitter, electricity
Sub- emissivities are 20a/cm2.Emitter is designed and sized to internal diameter 2mm, external diameter 5mm, is divided into two sections, total length 10mm.Interior shifting
Distance respectively 2mm, 3mm and 5mm.Throttle orifice aperture 0.8mm.
By interior shifting throttle orifice, reduce emitter thermograde, expand effective electron emission area, prevent negative electrode overheated,
Reduce running voltage, extend dot pattern discharge current scope.The method is simple, can on the premise of not increasing gas supply flow,
The discharge current scope of extending cathode power mode.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of the spirit or essential attributes of the present invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Although herein with reference to specific embodiment, the present invention to be described it should be understood that, these are real
Apply the example that example is only principles and applications.It should therefore be understood that exemplary embodiment can be carried out
Many modifications, and can be designed that other arrangements, the spirit of the present invention being limited without departing from claims
And scope.It should be understood that can come by way of different from described by original claim with reference to different appurtenances
Profit requires and feature specifically described herein.It will also be appreciated that can use with reference to the feature described by separate embodiments
In other described embodiments.
Claims (6)
1. a kind of method of broadening hollow cathode dot pattern discharge current scope is it is characterised in that the method comprises the following steps:
Step one: according to hollow cathode actual demand design negative electrode part, and initial setting throttle orifice inset from；
Step 2: make negative electrode normal work, measure hollow cathode running parameter；
Step 3: according to hollow cathode work layout throttle orifice inset from then making negative electrode normal work, measurement is hollow
Negative electrode running parameter；
Repeat step three, until find optimum throttle orifice inset from.
2. according to claim 1 a kind of broadening hollow cathode dot pattern discharge current scope method it is characterised in that
The material of throttle orifice is tungsten, lab6, cerium tungsten, lanthanum tungsten or barium tungsten, the material of the emitter of hollow cathode is tungsten, lab6, cerium tungsten, lanthanum
Tungsten or barium tungsten.
3. the method for a kind of broadening hollow cathode dot pattern discharge current scope according to claim 1 and 2, its feature exists
True according to the electron emissivity of emitter and required maximum discharge current in, the length of the emitter of hollow cathode and internal diameter
Fixed, the minima in throttle orifice aperture determines, the maximum in throttle orifice aperture is according to gas supply flow and the moon according to via electric current density
Extremely required minimum restriction effect determines.
4. the method for a kind of broadening hollow cathode dot pattern discharge current scope according to claim 1 and 2, its feature exists
In, throttle orifice inset from scope be hollow cathode emitter total length 20%-50%.
5. the method for a kind of broadening hollow cathode dot pattern discharge current scope according to claim 1 and 2, its feature exists
In the current range of hollow cathode is 5a-200a.
6. the method for a kind of broadening hollow cathode dot pattern discharge current scope according to claim 1 and 2, its feature exists
In the scope of negative electrode gas supply flow is 2sccm-50sccm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610959108.2A CN106373842B (en) | 2016-11-03 | 2016-11-03 | A kind of method for widening hollow cathode dot pattern discharge current range |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610959108.2A CN106373842B (en) | 2016-11-03 | 2016-11-03 | A kind of method for widening hollow cathode dot pattern discharge current range |
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| CN106373842A true CN106373842A (en) | 2017-02-01 |
| CN106373842B CN106373842B (en) | 2018-07-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108009386A (en) * | 2017-12-29 | 2018-05-08 | 哈尔滨工业大学 | A kind of hollow cathode touches the optimum design method for holding pole aperture |
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|---|---|---|---|---|
| JPH0896709A (en) * | 1994-09-27 | 1996-04-12 | Shimadzu Corp | Manufacture of multipole electrode |
| JP2004169606A (en) * | 2002-11-19 | 2004-06-17 | National Aerospace Laboratory Of Japan | Hollow cathode |
| JP2007250316A (en) * | 2006-03-15 | 2007-09-27 | Mitsubishi Electric Corp | Hollow cathode |
| CN202917423U (en) * | 2012-11-30 | 2013-05-01 | 电子科技大学 | A hollow cathode assembly |
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| CN105764225A (en) * | 2016-05-19 | 2016-07-13 | 中国工程物理研究院材料研究所 | Compact type high-power hollow cathode discharge device |
-
2016
- 2016-11-03 CN CN201610959108.2A patent/CN106373842B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0896709A (en) * | 1994-09-27 | 1996-04-12 | Shimadzu Corp | Manufacture of multipole electrode |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108009386A (en) * | 2017-12-29 | 2018-05-08 | 哈尔滨工业大学 | A kind of hollow cathode touches the optimum design method for holding pole aperture |
| CN108009386B (en) * | 2017-12-29 | 2021-03-30 | 哈尔滨工业大学 | Optimization design method for aperture of hollow cathode holding electrode |
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| CN106373842B (en) | 2018-07-06 |
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Granted publication date: 20180706 |