EP3578014A1 - Source de plasma - Google Patents
Source de plasmaInfo
- Publication number
- EP3578014A1 EP3578014A1 EP17832280.6A EP17832280A EP3578014A1 EP 3578014 A1 EP3578014 A1 EP 3578014A1 EP 17832280 A EP17832280 A EP 17832280A EP 3578014 A1 EP3578014 A1 EP 3578014A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- diameter
- plasma
- plasma source
- opening
- 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
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J27/00—Ion beam tubes
- H01J27/02—Ion sources; Ion guns
- H01J27/16—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation
-
- 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
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
- H05H1/461—Microwave discharges
- H05H1/463—Microwave discharges using antennas or applicators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/06—Sources
- H01J2237/08—Ion sources
- H01J2237/0815—Methods of ionisation
- H01J2237/0817—Microwaves
-
- 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
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
- H05H1/4645—Radiofrequency discharges
- H05H1/466—Radiofrequency discharges using capacitive coupling means, e.g. electrodes
Definitions
- the present invention relates to a gaseous plasma source and more particularly to a source in which the plasma is obtained by interaction between a high-frequency electromagnetic radiation and a low-pressure gas.
- FIG. 1 attached is Figure 1 of Japanese Patent Application Publication Number JPH09245658 describing a plasma source. Only certain elements of this figure will be described below. Reference can be made to the Japanese patent application for more complete explanations.
- the plasma source represented in this figure comprises a plasma chamber 1, in which is disposed a quarter-wave antenna 6.
- the antenna 6 is isolated from the chamber of the plasma chamber 1 at its base by an insulator 2
- the free end of the antenna 6 is located opposite an electrode 8.
- An inlet 4 allows the introduction of gas into the low pressure chamber of the chamber 1.
- the antenna is excited by a high frequency electromagnetic field and a plasma 5 is formed in the chamber 1 at locations where the field electromagnetic is maximum, as indicated by a scatter plot.
- Permanent magnets 3 are arranged around the chamber of the plasma chamber 1, so as to confine the plasma. Plasma charges may be extracted by an opening or extraction grid 14.
- the antenna 6 is described as having a life of two to three hours, and this is attributed to the fact that the antenna 6 is subjected to spraying, same as the walls of the chamber 1. It is specified that it is therefore necessary to regularly change the antenna 6 and clean the plasma chamber 1. Accordingly, it is necessary to regularly remove the plasma source of the vacuum chamber in which it is used, which leads to relatively long maintenance and vacuum restoration operations.
- an embodiment provides a plasma source comprising a quarter-wave antenna located in a cylindrical chamber provided with an opening opposite the end of the antenna, wherein: the diameter of the antenna is included between the third and the quarter of the internal diameter of the enclosure, the distance between the end of the antenna and the opening is between 2/3 and 5/3 of the diameter of the antenna.
- the internal diameter of the enclosure is of the order of 10 mm.
- the internal diameter of the chamber is 10 mm
- the diameter of the antenna is between 2.5 and 3.3 mm
- the distance between the end of the antenna and the opening is between 1.5 and 5.5 mm.
- the opening is a circular opening with a diameter of between 1 ⁇ m and the internal diameter of the enclosure.
- the opening is an extraction grid.
- the excitation frequency of the antenna is 2.45 GHz.
- One embodiment provides a large plasma source comprising an assembly of plasma sources, such as those previously described, arranged side by side.
- Figure 1 described above, is a sectional view of a plasma source, and shows Figure 1 of the patent application JPH09245658;
- FIGS. 2A to 2C show plasma chambers provided with antennas of different diameters
- Figs. 3A and 3B are diagrams showing the average energy E radiated by the antenna in various areas as a function of the diameter d of the antenna.
- Figure 4 is a schematic front view of an embodiment of a plasma source.
- the same elements have been designated by the same references in the various figures. For the sake of clarity, only the elements useful for understanding the described embodiments have been shown and are detailed.
- the plasma source elements surrounding the plasma chamber such as in particular a gas inlet, permanent magnets, high frequency signal connections and extraction electrodes are not shown.
- the terms “approximately”, “substantially” and “of the order of” mean within 10%, preferably within 5%.
- FIGS. 2A to 2C are sectional views of cylindrical plasma chambers 100, all identical, in which quarter-wave antennas 102 of different diameters are disposed.
- a quarter-wave antenna is here understood to mean an antenna whose length is approximately equal to a quarter of the wavelength of the excitation signal of this antenna.
- the antennas of FIGS. 2A, 2B and 2C have respective diameters of 1, 3 and 6 mm.
- Each plasma chamber 100 includes an opening or extraction grid 104 through which plasma ions can be extracted.
- a surface 105 defines a plasma formation zone.
- This plasma formation zone corresponds to the area surrounding the antenna in which the electromagnetic field has a high enough value to allow plasma formation. This value may for example be of the order of 10 ⁇ V / m.
- the inventors consider a first region 106 in each plasma formation zone. This region 106 is located on the side of the opening or extraction grid 104.
- the region 106 called here useful region, contains a plasma that will be called the useful plasma, that is to say the plasma from from which ions can be extracted to form an ion source.
- This region 108 is located around the antenna 102 over at least a part of its length.
- the region 108 called here useless region, contains a plasma which will be called the useless plasma.
- the useless plasma can not be extracted from the plasma source, thus has no useful role but proves to be the cause of the degradation of the antenna 102 described in the patent application JPH09245658.
- the inventors have therefore sought to maximize the useful plasma volume while reducing the unnecessary plasma volume. For this, the inventors have studied the incidence of the diameter of the antenna 102 of a plasma chamber 100 on these plasma regions useful and useless.
- plasma chambers 100 with an internal diameter of 10 mm are considered as examples.
- the antenna 102 has a diameter of 1 mm. This corresponds to the dimensions of the antenna and the plasma chamber illustrated in the aforementioned Japanese patent application.
- the antenna 102 has a diameter of 3 mm.
- the unnecessary region 108 has a smaller volume than in the case of Figure 2A, resulting in reduced degradation.
- the useful region 106 retains a similar volume.
- the antenna 102 has a diameter of 6 mm.
- the useless region 108 has a still smaller volume. However, the volume of the useful region 106 is also reduced.
- FIGS. 3A and 3B are diagrams respectively representing the energy E stored in the useful region 106 and in the useless region 108, as a function of the diameter d of the antenna 102, for the same radiated power with an intensity of 5 W at a frequency of 2.45 GHz.
- the energy E stored in the useful region 106 for diameters d of the antenna 102 between 1 and 3 mm, is approximately constant, and close to ⁇ . ⁇ - !! J. It is also noted that, for diameters of between 3 and 6 mm, the energy E stored in the useful region 106 decreases sharply until it reaches a value substantially half, close to 3.10%. for a diameter d of the antenna 102 of 6 mm.
- an increase in the diameter of the antenna causes a decrease in the volume of the useless region 108, i.e. a decrease in the amount of unnecessary plasma capable of damaging the antenna 102.
- the useful region 106 contains a substantially constant amount of plasma useful for antenna diameters 102 approximately between 1 and 3 mm.
- An advantageous diameter of the antenna 102 is therefore a diameter which makes it possible to keep a useful region volume 106 as large as possible while reducing as much as possible the volume of the useless region 108.
- a diameter of the advantageous antenna is about 3 mm, for example between 2.5 and 3.3 mm, for an internal diameter of the plasma chamber 100 of 10 mm. This corresponds to a diameter of the antenna of a plasma source between a quarter and a third of the internal diameter of the plasma chamber.
- FIG. 4 is a schematic sectional view of an embodiment of a plasma chamber 200.
- the plasma chamber 200 comprises a cylindrical enclosure 202.
- a quarter-wave antenna 204 is disposed in the enclosure 202.
- the The base of the antenna 204 is isolated from the enclosure by an insulator 206.
- the enclosure 202 comprises an opening 208 facing the end of the antenna 204.
- the opening 208 is, in this example, a circular opening .
- the opening 208 may also be an extraction grid.
- the internal diameter d ] _ of the enclosure is in this example of 10 mm.
- an optimum value of the diameter d of the antenna 204 is between a quarter and a third of the internal diameter d ] _ of the enclosure, that is to say approximately between 2.5 and 3.3 mm.
- the distance 1 between the end of the antenna 204 and the opening 208 has a value for example between 2/3 and 5/3 of the diameter of the antenna 204, that is to say between here 1 , 5 and 5.5 mm.
- the diameter d2 of the opening 208 in the example of FIG. 4 has a diameter approximately equal to the diameter d of the antenna 208, for example between 4/5 and 6/5 of the diameter d of the antenna 204.
- the inner diameter d] _ from the plasma chamber is described herein as having a value of 10 mm. This diameter can be chosen differently.
- the diameter of the opening 208 may vary between 1 ⁇ m and the internal diameter d ] _ of the enclosure.
- Such plasma sources can be associated with each other to form an extended plasma source.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Electromagnetism (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Plasma Technology (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL17832280T PL3578014T3 (pl) | 2017-02-06 | 2017-12-21 | Źródło plazmy |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1750978A FR3062770B1 (fr) | 2017-02-06 | 2017-02-06 | Source de plasma |
| PCT/FR2017/053798 WO2018142036A1 (fr) | 2017-02-06 | 2017-12-21 | Source de plasma |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3578014A1 true EP3578014A1 (fr) | 2019-12-11 |
| EP3578014B1 EP3578014B1 (fr) | 2020-10-28 |
Family
ID=58547698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17832280.6A Active EP3578014B1 (fr) | 2017-02-06 | 2017-12-21 | Source de plasma |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US10798810B2 (fr) |
| EP (1) | EP3578014B1 (fr) |
| JP (1) | JP6847267B2 (fr) |
| KR (1) | KR102526862B1 (fr) |
| CN (1) | CN110383957B (fr) |
| DK (1) | DK3578014T3 (fr) |
| FR (1) | FR3062770B1 (fr) |
| PL (1) | PL3578014T3 (fr) |
| WO (1) | WO2018142036A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3136104A1 (fr) | 2022-05-30 | 2023-12-01 | Polygon Physics | Dispositif à faisceau d’électrons pour le traitement d’une surface |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3023055A1 (de) * | 1979-07-12 | 1981-02-05 | Emi Ltd | Antenne |
| FR2480552A1 (fr) * | 1980-04-10 | 1981-10-16 | Anvar | Generateur de plasma |
| US5361737A (en) * | 1992-09-30 | 1994-11-08 | West Virginia University | Radio frequency coaxial cavity resonator as an ignition source and associated method |
| US7103460B1 (en) * | 1994-05-09 | 2006-09-05 | Automotive Technologies International, Inc. | System and method for vehicle diagnostics |
| JPH09245658A (ja) * | 1996-03-12 | 1997-09-19 | Nissin Electric Co Ltd | 永久磁石によるecr共鳴を利用するプラズマ生成機構 |
| US5961772A (en) * | 1997-01-23 | 1999-10-05 | The Regents Of The University Of California | Atmospheric-pressure plasma jet |
| US20070095823A1 (en) * | 2005-10-27 | 2007-05-03 | Sedlmayr Steven R | Microwave nucleon-electron-bonding spin alignment and alteration of materials |
| CN100388559C (zh) * | 2005-12-29 | 2008-05-14 | 上海交通大学 | 自重构等离子体天线 |
| PT2211916E (pt) * | 2007-11-06 | 2016-01-11 | Creo Medical Ltd | Sistema de esterilização por plasma de micro-ondas e respetivos aplicadores |
| KR101012345B1 (ko) * | 2008-08-26 | 2011-02-09 | 포항공과대학교 산학협력단 | 저 전력 휴대용 마이크로파 플라즈마 발생기 |
| FR2937494B1 (fr) * | 2008-10-17 | 2012-12-07 | Centre Nat Rech Scient | Source de plasma gazeux basse puissance |
| US20110248002A1 (en) * | 2010-04-13 | 2011-10-13 | General Electric Company | Plasma generation apparatus |
| EP2928011B1 (fr) * | 2014-04-02 | 2020-02-12 | Andrew Wireless Systems GmbH | Résonateur à cavité micro-ondes |
-
2017
- 2017-02-06 FR FR1750978A patent/FR3062770B1/fr not_active Expired - Fee Related
- 2017-12-21 KR KR1020197025109A patent/KR102526862B1/ko active Active
- 2017-12-21 DK DK17832280.6T patent/DK3578014T3/da active
- 2017-12-21 US US16/480,063 patent/US10798810B2/en active Active
- 2017-12-21 JP JP2019563692A patent/JP6847267B2/ja active Active
- 2017-12-21 WO PCT/FR2017/053798 patent/WO2018142036A1/fr not_active Ceased
- 2017-12-21 PL PL17832280T patent/PL3578014T3/pl unknown
- 2017-12-21 CN CN201780085783.XA patent/CN110383957B/zh active Active
- 2017-12-21 EP EP17832280.6A patent/EP3578014B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR3062770A1 (fr) | 2018-08-10 |
| US20190394866A1 (en) | 2019-12-26 |
| US10798810B2 (en) | 2020-10-06 |
| EP3578014B1 (fr) | 2020-10-28 |
| CN110383957B (zh) | 2021-09-17 |
| FR3062770B1 (fr) | 2019-03-29 |
| JP6847267B2 (ja) | 2021-03-24 |
| WO2018142036A1 (fr) | 2018-08-09 |
| JP2020506526A (ja) | 2020-02-27 |
| KR102526862B1 (ko) | 2023-04-27 |
| KR20190109749A (ko) | 2019-09-26 |
| PL3578014T3 (pl) | 2021-05-31 |
| CN110383957A (zh) | 2019-10-25 |
| DK3578014T3 (da) | 2020-11-30 |
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