CN104269336A - Ion thruster discharge chamber magnetic pole structure and design method thereof - Google Patents
Ion thruster discharge chamber magnetic pole structure and design method thereof Download PDFInfo
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- CN104269336A CN104269336A CN201410447552.7A CN201410447552A CN104269336A CN 104269336 A CN104269336 A CN 104269336A CN 201410447552 A CN201410447552 A CN 201410447552A CN 104269336 A CN104269336 A CN 104269336A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J27/00—Ion beam tubes
- H01J27/02—Ion sources; Ion guns
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H1/00—Using plasma to produce a reactive propulsive thrust
- F03H1/0081—Electromagnetic plasma thrusters
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Abstract
The invention discloses an ion thruster discharge chamber magnetic pole structure which comprises a lower magnetic pole (1), a middle magnetic pole (2), an upper magnetic pole (3), a lower pole shoe (4), a middle pole shoe (5) and an upper pole shoe (6). The lower pole shoe (4), the middle pole shoe (5) and the upper pole shoe (6) are correspondingly connected with the lower magnetic pole (1), the middle magnetic pole (2) and the upper magnetic pole (3). The structure further comprises permanent magnets (9 and 10). A magnetic force line loop is formed among the magnetic poles through the pole shoes (4, 5 and 6) and the permanent magnets (9 and 10). A loop tip cusped magnetic field is formed in a discharge chamber. The structure is characterized in that positive pole cylinders (7 and 8) of the discharge chamber are arranged in the cusped magnetic field, all the magnetic poles extend to the inner surfaces of the positive pole cylinders (7 and 8) and are charged with negative electricity relative to the positive pole cylinders (7 and 8), and a discharge chamber negative pole (11) installed on the lower pole shoe (4) directly extends into the discharge chamber under the circumstance without the positive pole cylinders ahead. The invention further discloses a design method for the ion thruster discharge chamber magnetic pole structure. When the structure is used, the primary electron utilization rate can be increased, and the discharging efficiency and the beam uniformity are improved.
Description
Technical field
The present invention relates to a kind of ion thruster arc chamber field structure and method for designing thereof, belong to space technology and lower temperature plasma technology field.
Background technology
Ion thruster, as the spacemarching of a kind of advanced person, possesses than leaping high, the advantage such as life-span length, compact conformation, thrust controllable precise, becomes domestic and international application one of space electric propulsion device the most widely.The height of ion thruster combination property embodies a concentrated reflection of realization and the plasma confinement ability aspect of efficiency index, comprises high working medium utilance, low discharge loss and high line glacing flatness.The physical basis realizing above-mentioned target is exactly size, the layout designs of arc chamber magnetic pole, is produced the magnetic field morpheme configuration optimized by the field structure optimized, and reaches the object improving discharging efficiency and improve plasma confinement ability.
At present, magnet pole layout's many employings ring point cusped magnetic field form, Fig. 1 (a) and Fig. 1 (b) is magnet pole layout's structural representation of prior art, wherein Fig. 1 (a) mainly illustrates Distribution of Magnetic Field, and Fig. 1 (b) illustrates the layout of magnetic pole in arc chamber and the position relationship of anode canister.As shown in Fig. 1 (b), traditional ring point cusped magnetic field adopts annular magnet (shown in figure is the cross section of annular magnet) as magnetic pole, to comprise magnetic pole, consequent pole and lower magnetic pole.Being arc chamber cone section between lower magnetic pole and consequent pole, is arc chamber shell of column between consequent pole and upper magnetic pole.Magnetic pole is distributed in outside anode canister, and the magnetic field configuration under this magnet pole layout is as shown in Fig. 1 (a).
Electronics, after negative electrode outgoing, under the constraint of the magnetic line of force, moves back and forth between magnetic pole around the magnetic line of force, when with the propellant working medium collision rift in arc chamber, it passes through the magnetic line of force and anode canister collides and disappears.
Before colliding with propellant working medium, do not wish that electronics and anode canister collide, cause meaningless electrical losses, reduce electronics utilance.But according to the magnet pole layout of Fig. 1, magnetic pole is positioned at outside anode canister, the magnetic line of force and the arc chamber anode canister inwall of boring in the middle part of section of formation exists and intersects on a small quantity, when this will cause electronics to move to infall along the magnetic line of force, and touching anode canister and disappearing.
Time near electron motion to magnetic pole, because magnetic pole is outside anode canister, the restriction ability of magnetic field to electronics weakens, and electronics, under the effect of electric field, is attracted by the anode near magnetic pole, collides this region and disappears, also result in the loss of electronics.
And, in current magnetic field configuration, can not take into account completely anode canister surface and cathode outlet place magnetic field intensity reach maximum simultaneously, namely to greatest extent the primary electron of cathode emission can not be constrained in anode near wall.Meanwhile, not, namely field-free region is large not for the decay of thruster exit magnetic field intensity, and too much primary electron in the gate near axis is assembled.The design original intention of this and arc chamber is not inconsistent, design original intention be all primary electrons from negative electrode send rear by magnetically confined to anode canister near surface, in this region by ionization by collision Working medium gas, the cation after ionization is evenly distributed in the space of field-free region by free diffusing.Gate upper surface region ion distribution is more even, and the line glacing flatness of extraction is better.Otherwise ion concentration will be larger than marginal density near grid axis, the gate hole focusing performance near axis will be deteriorated, and finally cause grid bad stability.Existing magnetic field configuration will meet design original intention exactly as much as possible, reaches an optimized magnetic field configuration, effectively improves primary electron utilization factor and beam homogeneity.
Summary of the invention
In view of this, the present invention has put forward a kind of ion thruster arc chamber field structure and method for designing thereof, can improve primary electron utilization factor, improves discharging efficiency and beam homogeneity.
In order to solve the problems of the technologies described above, the present invention is achieved in that
A kind of ion thruster arc chamber field structure, comprise lower magnetic pole, consequent pole, upper magnetic pole and corresponding lower pole shoe, middle pole shoe and the upper pole shoe connected, also comprise permanent magnet, between magnetic pole, form flux loop by pole shoe and permanent magnet, form ring point cusped magnetic field in arc chamber inside; Feature of the present invention is: the anode canister of arc chamber is placed in cusp field inside; Each magnetic pole all stretches into anode canister inner surface, and electronegative relative to anode canister; The arc chamber negative electrode be installed on lower pole shoe directly stretches into arc chamber inside when front does not have anode canister.
Preferably, lower magnetic pole is two field structures of two concentric ring compositions, and wherein one extremely near arc chamber cathode side, and another is extremely near anode canister.
Preferably, upper magnetic pole and upper pole shoe are Split type structure, and the upper magnetic pole arranging multiple length specification is as alternative.
Preferably, the direction stretching into anode canister with magnetic pole is defined as length direction, then the length direction of lower magnetic pole and upper magnetic pole is parallel to arc chamber axis direction, and the length direction of consequent pole is perpendicular to arc chamber axis direction.
Preferably, described anode canister is that two-part structure comprises cone section anode canister and shell of column anode canister.
Preferably, lower magnetic pole stretches into the one end in anode canister and bores the distance a1=8mm of section anode canister upper surface, the thick b1=2mm of ring of lower magnetic pole; An end face near lower magnetic pole is cone section anode canister upper surface; Consequent pole stretches into the distance a2=7mm of one end in anode canister and shell of column anode canister inwall, the ring width b2=4mm of consequent pole; The upper magnetic pole (3) of various length specification, ring is thick is b3=2mm, and the distance a3 stretching into one end in anode canister and upper pole shoe installed surface is respectively 6mm, 8mm, 10mm, 12mm.
Preferably, described permanent magnet comprises cone section magnet steel and shell of column magnet steel; Cone section magnet steel is distributed on electric discharge locular wall cone section excircle, connects lower pole shoe and middle pole shoe; Shell of column magnet steel is distributed on arc chamber pilaster section excircle, pole shoe and upper pole shoe in the middle of connecting; Shell of column magnet steel is identical in the polarity of middle pole shoe with cone section magnet steel.
Preferably, bore section magnet steel and axially axially axially all become miter angle with consequent pole with lower magnetic pole.
Preferably, magnetic pole and pole shoe all select electrical pure iron DT4C to make, and permanent magnet all selects high-temperature rare earth cobalt Sm2Co17 material to make; The equal aluminium alloy of anode canister makes.
Present invention also offers a kind of method for designing of ion thruster arc chamber field structure, comprise the steps:
Step 1, using above-mentioned arc chamber field structure as initial configuration, wherein permanent magnet adopt electromagnet replace; Utilize electromagnetic field software emulation to obtain arc chamber internal magnetic field configuration, load on the basis of setting exciting current at electromagnet, by adjustment pole dimension and the length stretching into anode canister, be optimized magnetic field configuration, optimization aim is:
A) magnetic field that formed in anode canister inner surface area of magnetic pole, the magnetic line of force is not crossing with anode canister inner surface, and as far as possible parallel with anode canister inner surface;
B) magnetic field is limited in anode canister near zone, makes the most of region near arc chamber internal gate be close to field-free region;
C) adjustment maximum magnetic field strength axially is just positioned at cathode outlet place;
Step 2, the magnetic pole emulated data determined according to step 1, structure actual magnetic electrode structure, still replace permanent magnet with electromagnet, by changing the exciting current of electromagnet, and on the basis of upper magnetic pole emulated data, in setting among a small circle, change the upper magnetic pole of different size, carry out the true field optimization of arc chamber axis direction; Optimization aim is: the discharge loss under fixing beam electronic current and beam voltage condition is minimum and working medium utilance is the highest, and the line glacing flatness calculated by measurement current density contours is the highest;
Step 3, complete above-mentioned two step Optimization Works after, under the design of the exciting current of current field structure and electromagnet, measure the total magnetic flux of cone section and shell of column, according to the principle that total magnetic flux is equal, complete permanent magnet design processing.
Beneficial effect:
Field structure of the present invention makes the magnetic line of force near anode parallel with anode surface, takes into account cathode outlet magnetic field intensity simultaneously and maximizes, improve primary electron utilization factor; And by the optimization to upper magnetic pole length, by the design of thruster exit region close to field-free region, improve line glacing flatness.Method for designing conveniently realizes optimized design and reduces experimentation cost.Specifically:
(1) the present invention makes magnetic pole stretch into arc chamber inside, exceeds anode canister inner surface, makes the magnetic line of force as far as possible away from anode canister, thus as far as possible non-intersect with anode canister.Due to non-intersect electronics would not be caused to move along the magnetic line of force time touch anode canister at infall or near magnetic pole.And the present invention makes magnetic pole electronegative relative to anode canister, therefore, when electronics to move along the magnetic line of force arrive near magnetic pole time, can not get on magnetic pole because of electric field action.So, primary electron can only by collision or turbulent transport diffusion can pass through the magnetic line of force and anode collides and disappears, and improves electronics utilance.
(2) because lower magnetic pole stretches into arc chamber inside, make the magnetic field at cathode outlet place stronger, all electronics from negative electrode out, will be more along the magnetic line of force toward border movement, design magnetic field is limited in anode near zone, major part Working medium gas is in this region by primary electron ionization by collision, and the ion of ionization is distributed in without in field region by free diffusing even action.By optimizing upper magnetic pole length, the most of region near grid is made to be close to field-free region, more be conducive to the even diffusion of ion, improve the uniformity of educt beaming flow, avoid the deterioration of the excessive gate hole focusing power caused of ion concentration near grid axis, cause grid bad stability, gate area utilizes the problems such as insufficient, thus improves discharging efficiency and line glacing flatness.
(3) this magnetic field structure, cone section magnetic flux density is better than shell of column magnetic flux density, and the magnetic field intensity on arc chamber axis is touched to hold near top, pole at negative electrode and reached maximum, arrives shell of column region, magnetic field intensity decays rapidly, reaches the object taking into account ionizing efficiency and beam homogeneity.
(4) lower magnetic pole adopts two field structure, makes anode canister surface and cathode outlet place reach stronger magnetic field intensity simultaneously.
Accompanying drawing explanation
The schematic diagram of the ion thruster field structure that Fig. 1 (a) and Fig. 1 (b) is prior art.
Fig. 2 is ion thruster field structure schematic diagram of the present invention.
Fig. 3 is consequent pole parameter schematic diagram.
Wherein, 1-lower magnetic pole; 2-consequent pole; The upper magnetic pole of 3-; Pole shoe under 4-; Pole shoe in the middle of 5-; The upper pole shoe of 6-; 7-bores section anode canister; 8-shell of column anode canister; 9-bores section magnet steel; 10-shell of column magnet steel; 11-negative electrode; 12-grid.A-arc chamber cone section; B-arc chamber shell of column.
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
The invention provides a kind of field structure of ion thruster arc chamber, arc chamber comprises electric discharge locular wall, anode canister, and field structure comprises magnetic pole, pole shoe, permanent magnet.Specifically, as shown in Figure 2, magnetic pole comprises lower magnetic pole 1, consequent pole 2 and upper magnetic pole 3, is loop configuration, and be that what is its cross section in figure, arc chamber is divided into cone section and shell of column two parts by consequent pole 2.Pole shoe is corresponding with magnetic pole, comprises lower pole shoe 4, middle pole shoe 5 and upper pole shoe 6.Form flux loop by pole shoe and permanent magnet between magnetic pole, form ring point cusped magnetic field in arc chamber inside.Feature of the present invention is: the anode canister of arc chamber is placed in cusp field inside; Each magnetic pole all stretches into anode canister inner surface, and electronegative relative to anode canister; The arc chamber negative electrode be installed on lower pole shoe directly stretches into arc chamber inside when front does not have anode canister.
Visible, the present invention makes magnetic pole stretch into arc chamber inside, exceeds anode canister inner surface, makes the magnetic line of force as far as possible away from anode canister, thus as far as possible non-intersect with anode canister.Due to non-intersect electronics would not be caused to move along the magnetic line of force time touch anode canister at infall or near magnetic pole.And the present invention makes magnetic pole electronegative relative to anode canister, therefore, when electronics to move along the magnetic line of force arrive near magnetic pole time, can not get on magnetic pole because of electric field action.So, primary electron can only by collision or turbulent transport diffusion can pass through the magnetic line of force and anode collides and disappears, and improves electronics utilance.
And, because lower magnetic pole stretches into arc chamber inside, make the magnetic field at cathode outlet place stronger, all electronics from negative electrode out, will be more along the magnetic line of force toward border movement, design magnetic field is limited in anode near zone, and most of Working medium gas is in this region by primary electron ionization by collision, and the ion of ionization is distributed in without in field region by free diffusing even action.By optimizing upper magnetic pole length, the most of region near grid is made to be close to field-free region, more be conducive to the even diffusion of ion, improve the uniformity of educt beaming flow, avoid the deterioration of the excessive gate hole focusing power caused of ion concentration near grid axis, cause grid bad stability, gate area utilizes the problems such as insufficient, thus improves discharging efficiency and line glacing flatness.
Below in conjunction with Fig. 2, the details that realizes of the present invention is described in detail.
In structure shown in Fig. 2, because magnetic pole stretches into anode canister inside, therefore preferably, anode canister is designed to two-part structure, comprises cone section anode canister 7 and shell of column anode canister 8.
Permanent magnet also comprises cone section magnet steel 9 and shell of column magnet steel 10.Cone section magnet steel 9 is distributed on electric discharge locular wall cone section excircle, connects lower pole shoe 4 and middle pole shoe 5.Shell of column magnet steel 10 is distributed on arc chamber pilaster section excircle, pole shoe 5 and upper pole shoe 6 in the middle of connecting; Shell of column magnet steel 10 is identical in the polarity at middle pole shoe 6 place with cone section magnet steel 9, is all S or is all N.It is even as far as possible that uniform benefit is to make arc chamber internal magnetic field, avoids the not uniform flux path magnetic resistance difference caused, and then the uniformity of impact electric discharge chamber piasma distribution.
Lower magnetic pole 1 and lower pole shoe 4 are structure as a whole (also can be separate structure), are positioned at arc chamber rear end.The direction stretching into anode canister with magnetic pole is defined as length direction, then the length direction of lower magnetic pole 1 is parallel to arc chamber axis direction.On the axis direction of arc chamber, cone section magnet steel 9 axially (in general permanent magnet is all column) is installed with the angled α of axis of lower magnetic pole 1, α prioritizing selection 45 degree.Cone section magnet steel 9 n root altogether, n range of choice is 8 to 16, is distributed on electric discharge locular wall cone section excircle.
In order to both ensure that cathode outlet place magnetic field intensity is optimum, ensure that again anode surface magnetic field intensity meets the demands, lower magnetic pole 1 is two field structures of two concentric ring compositions, and wherein one extremely near arc chamber negative electrode 11 side, and another is extremely near cone section anode canister 7.Magnetic Field Design criterion calls, anode canister surface and cathode outlet place all will reach stronger magnetic field intensity, and single magnetic pole well can not take into account the demand, therefore adopt two magnetic pole, make anode canister surface and cathode outlet place reach desirable field strength values simultaneously.
Consequent pole 2 and middle pole shoe 5 are structure as a whole (also can be separate structure), and be positioned at arc chamber stage casing, the length direction of consequent pole 2 is perpendicular to arc chamber axis direction.Consequent pole 2 axially axially becomes beta angle to install with cone section magnet steel, β prioritizing selection 45 degree.Conveniently install, bore in the middle of section magnet steel between two, axially install shell of column magnet steel along arc chamber, shell of column magnet steel is m root altogether, and m range of choice is 8 to 16, is distributed on arc chamber pilaster section excircle.
Upper magnetic pole 3 is Split type structure with upper pole shoe 6, and be positioned at arc chamber front end, the length direction of upper magnetic pole 3 is parallel to arc chamber axis direction.Axially corresponding shell of column magnet steel is installed along arc chamber outside upper pole shoe 3.The length halved tie stream glacing flatness that upper magnetic pole 3 stretches into anode canister is responsive, therefore upper magnetic pole and upper pole shoe is designed to Split type structure, facilitates the replacing of magnetic pole length.The upper magnetic pole 3 of multiple length specification so should be set as alternative.
In material, magnetic pole and the pole shoe electrical pure iron DT4C that all preferably magnetic permeability is high makes; Cone section magnet steel and shell of column magnet steel all preferably high-temperature rare earth cobalt Sm2Co17 material make, and its working temperature is high, and high-temperature stability is good; Cone section anode canister and shell of column anode canister all preferably aluminium alloy make, and it is magnetic conduction not, and quality is light, and specific stiffness is large.
Based on above-mentioned field structure, present invention also offers a kind of method for designing of ion thruster arc chamber field structure, it comprises the steps:
Step 1, using above-mentioned arc chamber field structure as initial configuration, wherein permanent magnet adopt electromagnet replace, to emulate.Utilize electromagnetic field software emulation to obtain arc chamber internal magnetic field configuration, load on the basis of setting exciting current at electromagnet, by adjustment pole dimension and the length stretching into anode canister, be optimized magnetic field configuration, optimization aim is:
A) magnetic field that formed in anode canister inner surface area of magnetic pole, the magnetic line of force is not crossing with anode canister inner surface, and as far as possible parallel with anode canister inner surface, and this can realize the low pressure of discharge plasma, densification and homogenizing;
B) magnetic field is limited in anode canister near zone, makes the most of region in arc chamber near grid 12 be close to field-free region, can strengthen the distributing homogeneity of educt beaming flow;
C) bore section magnetic flux density and be better than shell of column magnetic flux density, and order maximum magnetic field strength axially is just positioned at negative electrode 11 exit, thus the magnetic field intensity arriving shell of column region is decayed rapidly, to reach the object taking into account ionizing efficiency and beam homogeneity.
Step 2, the magnetic pole emulated data determined according to step 1, structure actual magnetic electrode structure, still replace permanent magnet with electromagnet, by changing the exciting current of electromagnet, and at the upper magnetic pole changing different size among a small circle on the basis of upper magnetic pole emulated data, carry out the true field optimization of arc chamber axis direction; Optimization aim is: the discharge loss under fixing beam electronic current and beam voltage (being also screen-grid voltage) condition is minimum and working medium utilance is the highest, and the line glacing flatness calculated by measurement current density contours is the highest; .
Step 3, complete above-mentioned two step Optimization Works after, under the design of the exciting current of current field structure and electromagnet, measure the total magnetic flux of cone section and shell of column, according to the principle that total magnetic flux is equal, complete permanent magnet design processing.
In conjunction with above-mentioned method for designing and factor consideration in many ways, finally determine that one end that lower magnetic pole 1 stretches in anode canister is a1=8mm with the distance of cone section anode canister 7 upper surface (end face near lower magnetic pole is bore section anode canister 7 upper surface), the thick b1=2mm of ring of lower magnetic pole 1;
Consequent pole 2 stretches into the distance a2=7mm of one end in anode canister and shell of column anode canister 8 inwall, the ring width b2=4mm of consequent pole 2; See Fig. 3;
The upper magnetic pole 3 of various length specification, ring is thick is b3=2mm, and the distance a3 stretching into one end in anode canister and upper pole shoe 3 installed surface is respectively 6mm, 8mm, 10mm, 12mm.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an ion thruster arc chamber field structure, comprise lower magnetic pole (1), consequent pole (2), upper magnetic pole (3) and corresponding lower pole shoe (4), middle pole shoe (5) and the upper pole shoe (6) connected, also comprise permanent magnet (9,10), by pole shoe (4,5,6) and permanent magnet (9 between magnetic pole, 10) form flux loop, form ring point cusped magnetic field in arc chamber inside; It is characterized in that, the anode canister (7,8) of arc chamber is placed in cusp field inside; Each magnetic pole all stretches into anode canister (7,8) inner surface, and electronegative relative to anode canister (7,8); The arc chamber negative electrode (11) be installed on lower pole shoe (4) directly stretches into arc chamber inside when front does not have anode canister.
2. ion thruster arc chamber field structure as claimed in claim 1, is characterized in that, lower magnetic pole (1) is two field structures of two concentric ring compositions, and wherein one extremely near arc chamber negative electrode (11) side, and another is extremely near anode canister.
3. ion thruster arc chamber field structure as claimed in claim 1 or 2, is characterized in that, upper magnetic pole (3) and upper pole shoe (6) are Split type structure, and the upper magnetic pole (3) arranging multiple length specification is as alternative.
4. ion thruster arc chamber field structure as claimed in claim 1, it is characterized in that, the direction stretching into anode canister with magnetic pole is defined as length direction, then the length direction of lower magnetic pole (1) and upper magnetic pole (3) is parallel to arc chamber axis direction, and the length direction of consequent pole (2) is perpendicular to arc chamber axis direction.
5. ion thruster arc chamber field structure as claimed in claim 1, is characterized in that, described anode canister is that two-part structure comprises cone section anode canister (7) and shell of column anode canister (8).
6. ion thruster arc chamber field structure as claimed in claim 5, it is characterized in that, lower magnetic pole (1) stretches into the one end in anode canister and bores the distance a1=8mm of section anode canister (7) upper surface, the thick b1=2mm of ring of lower magnetic pole (1); An end face near lower magnetic pole is cone section anode canister (7) upper surface;
Consequent pole (2) stretches into the distance a2=7mm of one end in anode canister and shell of column anode canister (8) inwall, the ring width b2=4mm of consequent pole (2);
The upper magnetic pole (3) of various length specification, ring is thick is b3=2mm, and the distance a3 stretching into one end in anode canister and upper pole shoe installed surface is respectively 6mm, 8mm, 10mm, 12mm.
7. ion thruster arc chamber field structure as claimed in claim 1, is characterized in that, described permanent magnet comprises cone section magnet steel (9) and shell of column magnet steel (10); Cone section magnet steel (9) is distributed on electric discharge locular wall cone section excircle, connects lower pole shoe (4) and middle pole shoe (5); Shell of column magnet steel (10) is distributed on arc chamber pilaster section excircle, pole shoe (6) and upper pole shoe (6) in the middle of connecting; Shell of column magnet steel (10) is identical in the polarity at middle pole shoe (6) place with cone section magnet steel (9).
8. ion thruster arc chamber field structure as claimed in claim 7, is characterized in that, cone section magnet steel (9) axially axially axially all becomes miter angle with consequent pole (2) with lower magnetic pole (1).
9. ion thruster arc chamber field structure as claimed in claim 1, it is characterized in that, magnetic pole and pole shoe all select electrical pure iron DT4C to make, and permanent magnet all selects high-temperature rare earth cobalt Sm2Co17 material to make; The equal aluminium alloy of anode canister makes.
10. a method for designing for ion thruster arc chamber field structure, is characterized in that, comprises the steps:
Step 1, using arc chamber field structure according to claim 3 as initial configuration, wherein permanent magnet adopt electromagnet replace; Utilize electromagnetic field software emulation to obtain arc chamber internal magnetic field configuration, load on the basis of setting exciting current at electromagnet, by adjustment pole dimension and the length stretching into anode canister, be optimized magnetic field configuration, optimization aim is:
A) magnetic field that formed in anode canister inner surface area of magnetic pole, the magnetic line of force is not crossing with anode canister inner surface, and as far as possible parallel with anode canister inner surface;
B) magnetic field is limited in anode canister near zone, makes the most of region near grid in arc chamber (12) be close to field-free region;
C) adjustment maximum magnetic field strength axially is just positioned at arc chamber negative electrode (11) exit;
Step 2, the magnetic pole emulated data determined according to step 1, structure actual magnetic electrode structure, still replace permanent magnet with electromagnet, by changing the exciting current of electromagnet, and on the basis of upper magnetic pole emulated data, in setting among a small circle, change the upper magnetic pole of different size, carry out the true field optimization of arc chamber axis direction; Optimization aim is: the discharge loss under fixing beam electronic current and beam voltage condition is minimum and working medium utilance is the highest, and the line glacing flatness calculated by measurement current density contours is the highest;
Step 3, complete above-mentioned two step Optimization Works after, under the design of the exciting current of current field structure and electromagnet, measure the total magnetic flux of cone section and shell of column, according to the principle that total magnetic flux is equal, complete permanent magnet design processing.
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| CN112943572A (en) * | 2021-03-23 | 2021-06-11 | 哈尔滨工业大学 | Magnetic circuit structure for changing post-loading degree of magnetic field of Hall thruster |
| CN113202707A (en) * | 2021-05-12 | 2021-08-03 | 兰州空间技术物理研究所 | Diameter-variable ion thruster magnetic pole |
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| CN112696330A (en) * | 2020-12-28 | 2021-04-23 | 上海空间推进研究所 | Magnetic pole structure of Hall thruster |
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| CN113357110A (en) * | 2021-07-02 | 2021-09-07 | 哈尔滨工业大学 | Method and structure for reducing primary electron loss in miniature ionic electric thruster |
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