EP2191700A1 - Elektrostatische ionenbeschleunigeranordnung - Google Patents
Elektrostatische ionenbeschleunigeranordnungInfo
- Publication number
- EP2191700A1 EP2191700A1 EP08804132A EP08804132A EP2191700A1 EP 2191700 A1 EP2191700 A1 EP 2191700A1 EP 08804132 A EP08804132 A EP 08804132A EP 08804132 A EP08804132 A EP 08804132A EP 2191700 A1 EP2191700 A1 EP 2191700A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ionization chamber
- anode
- arrangement according
- electrode body
- reflector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/54—Plasma accelerators
-
- 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
- F03H1/0006—Details applicable to different types of plasma thrusters
- F03H1/0031—Thermal management, heating or cooling parts of the thruster
-
- 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
- F03H1/0037—Electrostatic ion thrusters
Definitions
- the invention relates to an electrostatic ion accelerator arrangement.
- Electrostatic ion accelerator arrangements can be advantageously used as drive devices in spacecraft.
- An advantageous embodiment known from WO 2003/000550 A1 provides a structure with a circular-cylindrical ionization chamber whose central longitudinal axis determines a longitudinal direction of the chamber geometry.
- the chamber is formed annularly around a central inner part.
- the ionization chamber has in the longitudinal direction on one side a jet outlet opening, through which a plasma jet is triggered in the longitudinal direction.
- a cathode is laterally offset outside the ionization chamber against the jet outlet opening.
- An anode is arranged in the longitudinal direction of the jet outlet opening opposite to the foot of the ionization chamber.
- a high voltage between anode and cathode forms in the ionization chamber a longitudinally directed electrostatic field which accelerates ions of a working gas ionized in the chamber in the direction of the jet exit opening and electrons in the direction of the anode.
- a magnetic field passing through the chamber causes a long residence time of electrons in the chamber before they are absorbed by the anode.
- the residual energy of the electrons when hitting the anode and the current through the anode cause the generation of heat loss in the anode, so that it heats up, which may limit the drive power and / or a complex and possibly interference-prone cooling by solid state heat dissipation and / or fluid cooling is required.
- the invention has for its object to provide an electrostatic ion accelerator arrangement, which copes with a simple structure, a high heat loss at the anode.
- a further, albeit small contribution to the dissipation of heat loss from the anode advantageously provides a supply of cold neutral working gas while flowing around the anode assembly, wherein the working gas receives heat from the anode assembly and into the ionization chamber transported.
- the working gas receives heat from the anode assembly and into the ionization chamber transported.
- the majority of the power loss occurring in the anode is radiated as heat radiation in the direction of the ionization chamber.
- the surface of the anode arrangement facing the ionization chamber reaches a temperature of at least 500 ° C. at a working point of the ion accelerator arrangement with maximum loss heat output. It is advantageously used that the output of a body as heat radiation power disproportionately increases (with the 4th power) to the temperature.
- the surface of the anode arrangement facing the ionization chamber is advantageously aligned substantially perpendicular to the longitudinal axis of the ionization chamber, so that the radiation component pointing in the direction of the surface normal faces the emission in the direction of the beam outlet opening and the heat radiation emitted in this direction is emitted directly into the surrounding free space.
- the reflector device may comprise a reflective coating of a rear side surface facing away from the ionization chamber
- Anode electrode include.
- the emissivity of the front side surface facing the ionization chamber in the direction of the jet outlet opening is higher than, in particular at least twice as high as the emissivity of the coated rear side surface of the anode electrode, in each case based on the spectral maximum of the thermal radiation emitted by the front side surface.
- the reflector device includes at least one longitudinally spaced from the anode electrode and on the side remote from the ionization chamber side of the anode electrode reflector surface, which is formed heat radiation reflecting.
- the emissivity of the front side surface of the anode electrode facing the ionization chamber is higher than, in particular at least twice, the emissivity of the reflector surface of the reflector device facing the anode electrode.
- at least two longitudinally spaced reflector surfaces are provided.
- the reflector surfaces are preferably metallic and are advantageously at the potential of the anode electrode and can in particular be structurally combined with this in a multi-part anode arrangement.
- the anode of a particular metallic support and a held thereon and in direct physical contact, the ionization chamber zu josden electrode material may be constructed, wherein the carrier z. B. may be cup-shaped and the emissivity of the rear side of the carrier facing away from the ionization chamber is less than, in particular at least half, that of the front side of the electrode material facing the ionization chamber.
- the anode electrode is formed by a disc-shaped body, which may be designed in particular as a material-homogeneous graphite body.
- Graphite is dimensionally stable up to high temperatures and shows a low electrical resistance and in particular a negative temperature coefficient of electrical resistance.
- the surface of graphite shows a particularly good radiation behavior.
- a coating of the rear side surface as a reflector device can be given by a vapor-deposited metal layer.
- the disk-shaped body of the anode electrode advantageously occupies the predominant cross-sectional area fraction of the chamber cross-section at substantially uniform temperature above the surface.
- the disc-shaped body is connected in the region of its center centrally at only one attachment point with a support body of the anode assembly, in particular screwed.
- the attachment structure advantageously consists of a highly heat-resistant material, in particular molybdenum.
- Fig. 1 shows schematically and in part an electrostatic ion accelerator arrangement with an anode arrangement.
- An ionization chamber IK of the ion accelerator arrangement is assumed to be rotationally symmetrical about a central longitudinal axis LA without restricting generality.
- the central longitudinal axis LA runs parallel to a longitudinal direction LR.
- a radial direction R is drawn in.
- the circular cross section of the ionization chamber is essentially constant in the longitudinal direction LR.
- the ionization chamber shows in the longitudinal direction LR on one side, in Fig. 1 to the right a jet outlet opening AO, from which an accelerated directed plasma stream PB is ejected.
- a cathode arrangement KA is arranged in the region of the jet outlet opening AO and preferably laterally offset therefrom.
- an anode assembly AN In the longitudinal direction of the jet outlet opening AO opposite set at the bottom of the ionization chamber is an anode assembly AN.
- Fig. 1 In Fig. 1 is because of the assumed rotational symmetry about the longitudinal axis LA only the above the longitudinal axis LA lying part of the ion accelerator arrangement shown.
- a high voltage HV which generates a longitudinally pointing in the ionization electric field.
- This electric field accelerates electrons in the direction of the anode arrangement and in the ionization chamber by ionization of a working gas generated positively charged ions in the direction of the jet exit opening AO.
- the ionization chamber is limited transversely to the longitudinal axis LA by a chamber wall KW of preferably dielectric, in particular ceramic material.
- a magnet arrangement MA On the side of the chamber wall which is radially outer with respect to the longitudinal axis, a magnet arrangement MA is arranged, the various possible structures of which are known in principle from the prior art and which is therefore only indicated schematically without details.
- the magnet arrangement generates a magnetic field in the ionization chamber, which increases the residence time of the electrons in the ionization chamber, which emit energy to the working gas by means of ionizing collisions before they reach the anode electrode EK. Effects of such ion accelerator in various constructive design, in particular with annular chamber geometry as in Hall ion accelerators are known from the prior art. Electrons impinging on the anode electrode EK from the ionization chamber cause the generation of heat loss in the anode electrode and its heating.
- the anode arrangement AN contains an anode electrode EK, a first reflector surface R1, a second reflector surface R2 and an anode carrier body AT in the direction of the longitudinal axis LA from the ionization chamber IK to the left.
- the plurality of components of the anode assembly are mechanically connected to each other via a support structure, which extends, for example, as a support pin TB of the support body AT in the direction of the anode electrode EK.
- the plurality of components are preferably all electrically conductive and are at a common electrical potential corresponding to an anode voltage HV, which is connected, for example, via the carrier body AT.
- the support pin TB at its ionization chamber end facing a thread on which a nut is screwed and secured.
- the relative position of the individual components of the anode assembly AN in the direction of the longitudinal axis LA can be precisely adjusted via spacers.
- the anode electrode EK is advantageously formed by a material-homogeneous graphite body.
- the reflector surfaces R1 and R2 are preferably formed as a substantially disk-shaped sheet metal body made of a high temperature resistant metal, such as molybdenum.
- the carrier body AT and the preferably integrally formed with this support pin TB advantageously also consist of a high temperature resistant material such as molybdenum in particular.
- a supply for a working gas AG is sketched via a diaphragm GB, via which the working gas AG in the vicinity of the longitudinal axis in the axial direction to the carrier body AT and fed along from the Ionization chamber IK weg disturbedd surface radially outward and in the region of the chamber wall KW in the longitudinal direction LR is directed in the direction of the ionization chamber.
- a portion of the reflector assembly is also provided between the radially outer edge of the anode electrode EK and the chamber wall, which may be formed, for example, by edge portions angled off the disk plane of one or both reflector devices R1, R2 in the longitudinal direction LR.
- the radial radiation of heat from the anode electrode EK in the direction of the chamber wall is reduced and, on the other hand, flow-on of the anode electrode EK by the working gas and thus the cooling of the anode electrode EK in the edge region is prevented.
- the anode electrode EK is heated, in particular by the residual energy of the electrons striking the anode electrode EK, it radiates increasingly heat radiation WS in the direction of the ionization chamber IK with increasing temperature.
- the maximum of the radiation characteristic of the surface of the anode electrode EK facing the ionization chamber IK runs in Direction of the surface normal, so that in a substantially planar design of the disc-shaped anode electrode EK, the maximum of the radiation characteristic is directed in the direction of the beam exit opening AO and radiated in this direction heat radiation WS is emitted directly into the free space.
- graphite as the material of the anode electrode EK, the radiation of heat radiation WS is particularly effective.
- the anode electrode EK radiates thermal radiation on its rear side in the same direction away from the ionization chamber IK toward the reflector device R1 in the same way. Due to the heat-reflecting reflector surface R1, whose emissivity is less than, in particular at most half as high as the emissivity of the front surface of the anode electrode, but a large part of this heat radiation is irradiated back to anode electrode EK, so that effectively away in the direction of the ionization EK radiated heat radiation component remains low.
- the second reflector surface R2 which in turn largely reflects the heat radiation power radiated by the latter with low emissivity in the direction of the reflector surface R2 when the first reflector surface R1 is heated.
- the radiated from the reflector surface R2 finally in the direction of the carrier body TK heat output remains low.
- a through this remaining heat radiation power as well as by the solid body heat conduction through the support pin TB on the carrier body TK reaching heat output is predominantly by solid state heat conduction through the metallic high voltage supply line and the typically dissipated nonmetallic, the anode assembly supporting structure.
- a small proportion of heat output can be dissipated again by the working gas flowing radially outward along the rear side of the carrier body.
- the heat radiation emitted by the ionization chamber IK to the front side surface of the anode electrode EK does not radiate directly through the jet outlet opening AO into the free space strikes the chamber wall KW and is there partly radiated into the ionization chamber and finally through the jet outlet opening AO in the free space or partially from absorbed the chamber wall and discharged by heating them again as heat radiation in the ionization chamber and through the jet outlet opening AO in the free space.
- the anode electrode EK can advantageously reach temperatures of more than 500 ° C. with maximum loss power, which typically occurs at maximum drive power of the ion accelerator arrangement.
- the high temperature leads to a high intensity of heat radiation WS with temperature over proportional (4th power) increase, so that sets a state of equilibrium.
- a dissipation of heat loss of the anode assembly via a solid heat conduction subordinate and can via the metallic electrical connection for supplying the Anodenhoch briefly and the suspension of the support body in the construction of the chamber are adequately managed. Active cooling via a much of the heat loss dissipating fluid cooling circuit is not required.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Particle Accelerators (AREA)
- Plasma Technology (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007044074A DE102007044074B4 (de) | 2007-09-14 | 2007-09-14 | Elektrostatische Ionenbeschleunigeranordnung |
| PCT/EP2008/062169 WO2009037200A1 (de) | 2007-09-14 | 2008-09-12 | Elektrostatische ionenbeschleunigeranordnung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2191700A1 true EP2191700A1 (de) | 2010-06-02 |
| EP2191700B1 EP2191700B1 (de) | 2015-11-11 |
Family
ID=40032472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08804132.2A Active EP2191700B1 (de) | 2007-09-14 | 2008-09-12 | Elektrostatische ionenbeschleunigeranordnung |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US8587227B2 (de) |
| EP (1) | EP2191700B1 (de) |
| JP (1) | JP5425081B2 (de) |
| KR (1) | KR101455214B1 (de) |
| CN (2) | CN101855949A (de) |
| DE (1) | DE102007044074B4 (de) |
| RU (1) | RU2523658C2 (de) |
| WO (1) | WO2009037200A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2602468C1 (ru) * | 2015-05-26 | 2016-11-20 | Акционерное общество "Конструкторское бюро химавтоматики" | Электроракетный двигатель (варианты) |
| FR3062545B1 (fr) * | 2017-01-30 | 2020-07-31 | Centre Nat Rech Scient | Systeme de generation d'un jet plasma d'ions metalliques |
| CN107795446B (zh) * | 2017-09-21 | 2020-01-24 | 北京机械设备研究所 | 一种大功率电推进器用电极的冷却装置及冷却方法 |
| WO2019090758A1 (en) * | 2017-11-13 | 2019-05-16 | Polyone Corporation | Polysiloxanes in thermoplastic elastomer compounds for overmolded thermoplastic articles |
| US10516216B2 (en) | 2018-01-12 | 2019-12-24 | Eagle Technology, Llc | Deployable reflector antenna system |
| US10707552B2 (en) | 2018-08-21 | 2020-07-07 | Eagle Technology, Llc | Folded rib truss structure for reflector antenna with zero over stretch |
| US12601330B1 (en) * | 2023-07-03 | 2026-04-14 | The Regents Of The University Of Michigan | Targeted-current-density hall thruster |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US34575A (en) * | 1862-03-04 | Improved high and low water detector for steam-boilers | ||
| US3159967A (en) * | 1963-03-12 | 1964-12-08 | James E Webb | Variable thrust ion engine utilizing thermally decomposable solid fuel |
| US4577461A (en) * | 1983-06-22 | 1986-03-25 | Cann Gordon L | Spacecraft optimized arc rocket |
| USRE34575E (en) * | 1986-04-30 | 1994-04-05 | Science Reseach Corporation | Electrostatic ion accelerator |
| US4825646A (en) * | 1987-04-23 | 1989-05-02 | Hughes Aircraft Company | Spacecraft with modulated thrust electrostatic ion thruster and associated method |
| JPH01244174A (ja) * | 1988-03-24 | 1989-09-28 | Toshiba Corp | 電子衝撃型イオンスラスタのホローカソード |
| FR2693770B1 (fr) * | 1992-07-15 | 1994-10-14 | Europ Propulsion | Moteur à plasma à dérive fermée d'électrons. |
| US5646476A (en) * | 1994-12-30 | 1997-07-08 | Electric Propulsion Laboratory, Inc. | Channel ion source |
| FR2743191B1 (fr) * | 1995-12-29 | 1998-03-27 | Europ Propulsion | Source d'ions a derive fermee d'electrons |
| JPH11351129A (ja) * | 1998-06-08 | 1999-12-21 | Ishikawajima Harima Heavy Ind Co Ltd | 直流アークスラスタ |
| US6336318B1 (en) * | 2000-02-02 | 2002-01-08 | Hughes Electronics Corporation | Ion thruster having a hollow cathode assembly with an encapsulated heater, and its fabrication |
| DE10014033C2 (de) * | 2000-03-22 | 2002-01-24 | Thomson Tubes Electroniques Gm | Plasma-Beschleuniger-Anordnung |
| US6391164B1 (en) * | 2000-06-23 | 2002-05-21 | Isak I. Beilis | Deposition of coatings and thin films using a vacuum arc with a non-consumable hot anode |
| DE10130464B4 (de) * | 2001-06-23 | 2010-09-16 | Thales Electron Devices Gmbh | Plasmabeschleuniger-Anordnung |
| JP3738734B2 (ja) * | 2002-02-06 | 2006-01-25 | 日新電機株式会社 | 静電加速管およびそれを備えるイオン注入装置 |
| RU2208871C1 (ru) * | 2002-03-26 | 2003-07-20 | Минаков Валерий Иванович | Плазменный источник электронов |
| US6608431B1 (en) * | 2002-05-24 | 2003-08-19 | Kaufman & Robinson, Inc. | Modular gridless ion source |
| US7116054B2 (en) * | 2004-04-23 | 2006-10-03 | Viacheslav V. Zhurin | High-efficient ion source with improved magnetic field |
-
2007
- 2007-09-14 DE DE102007044074A patent/DE102007044074B4/de active Active
-
2008
- 2008-09-12 WO PCT/EP2008/062169 patent/WO2009037200A1/de not_active Ceased
- 2008-09-12 CN CN200880115852A patent/CN101855949A/zh active Pending
- 2008-09-12 JP JP2010524505A patent/JP5425081B2/ja not_active Expired - Fee Related
- 2008-09-12 EP EP08804132.2A patent/EP2191700B1/de active Active
- 2008-09-12 US US12/733,624 patent/US8587227B2/en active Active
- 2008-09-12 RU RU2010114726/07A patent/RU2523658C2/ru active
- 2008-09-12 CN CN201510535297.6A patent/CN105228331B/zh active Active
- 2008-09-12 KR KR1020107008167A patent/KR101455214B1/ko not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009037200A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2523658C2 (ru) | 2014-07-20 |
| US20100289437A1 (en) | 2010-11-18 |
| DE102007044074B4 (de) | 2011-05-26 |
| CN101855949A (zh) | 2010-10-06 |
| DE102007044074A1 (de) | 2009-04-02 |
| JP2010539376A (ja) | 2010-12-16 |
| WO2009037200A1 (de) | 2009-03-26 |
| US8587227B2 (en) | 2013-11-19 |
| KR20100099677A (ko) | 2010-09-13 |
| KR101455214B1 (ko) | 2014-10-27 |
| JP5425081B2 (ja) | 2014-02-26 |
| RU2010114726A (ru) | 2011-10-20 |
| CN105228331A (zh) | 2016-01-06 |
| CN105228331B (zh) | 2018-10-02 |
| EP2191700B1 (de) | 2015-11-11 |
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