EP1123641A1 - Gasgefüllter teilchenbeschleuniger mit einer gepulsten plasmaquelle - Google Patents
Gasgefüllter teilchenbeschleuniger mit einer gepulsten plasmaquelleInfo
- Publication number
- EP1123641A1 EP1123641A1 EP99952541A EP99952541A EP1123641A1 EP 1123641 A1 EP1123641 A1 EP 1123641A1 EP 99952541 A EP99952541 A EP 99952541A EP 99952541 A EP99952541 A EP 99952541A EP 1123641 A1 EP1123641 A1 EP 1123641A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- discharge
- particle accelerator
- trigger
- plasma source
- sliding discharge
- 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
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J27/00—Ion beam tubes
- H01J27/02—Ion sources; Ion guns
- H01J27/08—Ion sources; Ion guns using arc discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T2/00—Spark gaps comprising auxiliary triggering means
- H01T2/02—Spark gaps comprising auxiliary triggering means comprising a trigger electrode or an auxiliary spark gap
-
- 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
- H05H1/52—Generating plasma using exploding wires or spark gaps
Definitions
- the invention relates to a pulsed plasma source for a gas-filled particle accelerator.
- a pulsed plasma source for a gas-filled particle accelerator.
- an ignition plasma of sufficient density which is provided by a plasma source, is necessary.
- Such a plasma source (see FIG. 4) consists of an inner conductor, an outer conductor in the form of a copper tube and a Teflon insulator.
- the Teflon insulator between the inner and outer conductors serves as a plasma dispenser.
- the copper tube is introduced into the hollow cathode space 4 of the particle accelerator.
- the outer conductor 3 of the tube is connected to the potential of the hollow cathode 2.
- the center electrode is pulled to ground potential to initiate the ignition process by igniting the spark gap 16. This leads to a surface sliding discharge between the outer and inner conductors along the insulator surface, as a result of which the insulator material evaporates and is ionized on the surface (plasma formation).
- the service life of the plasma source is of little interest for industrial use, a maximum of 10 5 - 10 ° ignition processes, since a lot of insulator material (Teflon) is evaporated and ionized during an ignition process.
- the material is usually removed on one side, so that after a short operating time, ie a few 10 5 ignitions, erosion channels are burned into the Teflon insulator.
- the ignition plasma is then no longer generated on the surface of the trigger and does not penetrate into the hollow cathode space, the generation of a particle beam does not occur. There is then a short circuit across this plasma in the erosion channel of the trigger, with the capacitor acting as an electrical energy source about a discharge resistor and the discharge that starts the discharge
- the trigger is placed in the hollow cathode hole. It is therefore located at a location that is particularly subject to severe erosion in hollow cathode arrangements.
- the trigger circuit and load circuit have different voltage levels.
- the required ignition voltage in pressure ranges below p 1.2 Pa is over 15 kV.
- the invention is therefore based on the object of having a plasma source for an industrially used particle accelerator for the ablation of material on a substrate which is very robust and has a long-term constancy which is excellent for the application problems.
- Their construction must be simple because of the low susceptibility to malfunction and it must be inexpensive. It must have a long service life, ie withstand 10 7 - 10 9 discharges, and work with repetition frequencies up to a few 100 Hz.
- the object is achieved by a pulsed plasma source according to the preamble and the characterizing features of claim 1.
- the new plasma source or the newly developed slide discharge trigger works in a pressure range of 0.1 ⁇ p ⁇ lOPa.
- the generation of a sufficient plasma for the reproducible and safe generation of a particle beam is essential there. However, this can only be achieved to a limited extent with low-erosion ceramics.
- the trigger and load circuit are supplied by the same voltage source (up to 20 kV).
- a high-current discharge is generated via an auxiliary capacitor, which means that it is also possible to use low-erosion ceramics as ignition media.
- the service life is 2xl0 7 discharges at a working pressure of 1 Pa, whereby the erosion increases with falling working pressure. With a higher working pressure, it becomes correspondingly lower.
- a ceramic insulator (10) is inserted as an insulator between the two ignition electrodes.
- no discharges take place over the surface even after a trigger pulse (20 kV) is applied. It is therefore necessary to pre-treat the surface of the insulator so that the resistance to surface sliding discharges is reduced.
- a thin layer of soda-water glass is applied to the surface of the ceramic, which supports the discharge in the initial stage.
- a differently insulating and easily evaporable material can also be applied to the ceramic surface. While this starting layer is used up, discharges also take place via the ceramic insulator itself, which contaminates the surface with oxides. After the soda-water glass has been used up, the surface of the insulator is so contaminated that surface discharge can take place over the surface. The ceramic material is then evaporated and ionized during further operation.
- the trigger serves as a stable plasma source over a large pressure range (0.1 Pa ⁇ p ⁇ 10 Pa).
- an emission ring 7 is installed in the hollow cathode space, it serves as an emission edge for the main discharge of the particle accelerator and thus as protection for the cathodes of the Triggers 8 from erosion. Is the plasma source of the potential of the
- FIG. 2 Main discharge separated (Fig. 2), the erosion of the plasma source (trigger electrodes, ceramic insulator) is also reduced. 2 shows an example for the control of such a plasma source.
- the subclaim 2 specifies the ceramic that lies between the two coaxial electrodes of the plasma source.
- Claim 3 characterizes the coaxial electrode arrangement in a very suitable and commercially inexpensive embodiment, namely as a car spark plug.
- a special connection of the trigger anode is used to control the ignition duration and the ignition energy. It is characterized in claim 4.
- the plasma source is very reliable, shows good ignition behavior even at low working pressures ( ⁇ 1 Pa) and has a long service life (several 10 7 shots).
- the execution with the Zundker centrigger allows discharge frequencies up to over 300 Hz without dropouts.
- proven technology - spark plugs are available on the market - a durable and reliable plasma source can be built at a low cost.
- the plasma source used is explained in more detail below with reference to the drawing. It shows: 1 shows the spark plug trigger with potential isolation,
- Figure 2 shows the triggering with potential isolation
- FIG. 3 shows the spark plug trigger in a multi-channel arrangement
- FIG. 4 shows the plasma source according to the prior art.
- the section in FIG. 1 shows the schematic, concentric structure of the trigger.
- the spark plug consists of the inner conductor 6, which ends in the anode 9 of the trigger, the surrounding insulator tube 5, which collides at the anode 9 with the insulator 10 of the anode 9, and the sheathed housing 3.
- the spark plug is modified, it has as the cathode 8 the cup-shaped structure at the end of the spark plug in the housing 3, so that the front of the anode 9 and the insulator 10 and the outer bottom of the cathode 8 have a flat end face form. This arrangement sits in the insulator 4, which electrically separates the spark plug from the hollow cathode 2.
- the emission ring 7 In front of the forehead of the modified spark plug is the emission ring 7, which is embedded in the hollow cathode 2 there. It is dimensioned in such a way that its inside emission edge leaves the sliding discharge area of the trigger free. In front of it is the hollow cathode space 4, into which the channel spark tube 1 opens. The channel spark tube is connected in a vacuum-tight manner to the hollow cathode 2 via the O-ring 11.
- the electrical wiring is shown in Figure 2.
- the capacitor 12 is charged by the high-voltage source via the protective diode 14 and the inductance 13.
- the resistor 15 controls the potential, it keeps the anode 9 of the spark plug trigger at the same potential as the cathode.
- the spark gap 16 ignites and sets the inner conductor 6 of the spark plug center via the trigger capacitor 18 to ground potential.
- the potential change between anode 9 and cathode 8 of the trigger leads to ignition the surface sliding discharge and plasma formation over the ceramic insulator 10.
- the spark remains until the trigger capacity 18 is charged.
- the trigger energy per discharge is set using the trigger capacitance 18.
- the cathode 8 and the outer jacket 3 of the spark plug trigger have the same potential during charging, since they are coupled to the hollow cathode via the inductor 19 and the diode 20 lying in series therewith. During ignition, both are decoupled from one another via precisely this branch 19, 20, so that the energy from the capacitor 12 for igniting the main discharge is only conducted via the emission ring 7. This additionally reduces the erosion at the plasma source, namely the trigger electrodes 8, 9 and the insulator 10. After the main discharge has been ignited, the trigger capacitance 18 is discharged via the resistor 17.
- the multi-channel arrangement for a coating system is shown in FIG. 3. Only now does the respective inductive decoupling 13, 14 of the particle accelerator (channel spark sources) make sense, namely simultaneous charging, but decoupled discharge during ignition. With the same wiring and dimensioning, the jitter between the discharges is very low; it has no negative quality impact on the coating. Discharge frequencies of over 100 Hz can be carried out over the long term without misconduct.
- FIG. 2 The dimensioning of the components in FIG. 2 is exemplary; it depends on the application and can therefore also vary depending on which material is to be ablated where and how. Reference list
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19849894 | 1998-10-29 | ||
DE19849894A DE19849894C1 (de) | 1998-10-29 | 1998-10-29 | Gepulste Plasmaquelle für einen gasgefüllten Teilchenbeschleuniger |
PCT/EP1999/007557 WO2000027170A1 (de) | 1998-10-29 | 1999-10-08 | Gasgefüllter teilchenbeschleuniger mit einer gepulsten plasmaquelle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1123641A1 true EP1123641A1 (de) | 2001-08-16 |
EP1123641B1 EP1123641B1 (de) | 2005-06-01 |
Family
ID=7886059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99952541A Expired - Lifetime EP1123641B1 (de) | 1998-10-29 | 1999-10-08 | Gasgefüllter teilchenbeschleuniger mit einer gepulsten plasmaquelle |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1123641B1 (de) |
AT (1) | ATE297108T1 (de) |
DE (2) | DE19849894C1 (de) |
WO (1) | WO2000027170A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10207835C1 (de) * | 2002-02-25 | 2003-06-12 | Karlsruhe Forschzent | Kanalfunkenquelle zur Erzeugung eines stabil gebündelten Elektronenstrahls |
WO2003092039A1 (fr) * | 2002-04-24 | 2003-11-06 | Apit Corp. S.A. | Dispositif pour le traitement de surface de recipients par plasma |
IT1395701B1 (it) * | 2009-03-23 | 2012-10-19 | Organic Spintronics S R L | Dispositivo per la generazione di plasma e per dirigere un flusso di elettroni verso un bersaglio |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8503420U1 (de) * | 1985-02-07 | 1986-06-05 | Siemens AG, 1000 Berlin und 8000 München | Triggerfunkenstrecke für einen Stoßwellengenerator |
JPS63313487A (ja) * | 1987-06-13 | 1988-12-21 | Horiba Ltd | ギヤツプスイツチ |
-
1998
- 1998-10-29 DE DE19849894A patent/DE19849894C1/de not_active Expired - Fee Related
-
1999
- 1999-10-08 EP EP99952541A patent/EP1123641B1/de not_active Expired - Lifetime
- 1999-10-08 WO PCT/EP1999/007557 patent/WO2000027170A1/de active IP Right Grant
- 1999-10-08 DE DE59912123T patent/DE59912123D1/de not_active Expired - Lifetime
- 1999-10-08 AT AT99952541T patent/ATE297108T1/de not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO0027170A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1123641B1 (de) | 2005-06-01 |
DE19849894C1 (de) | 2000-06-29 |
ATE297108T1 (de) | 2005-06-15 |
DE59912123D1 (de) | 2005-07-07 |
WO2000027170A1 (de) | 2000-05-11 |
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