Patent US4852180A successfully refreshed from Google Patents.
US3798488A
Expired / Lapsed
US
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Plasma source of charged particles
Assignee: Individual
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Filing: 1971-07-28
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Granted: 1974-03-19
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Expires: 1991-07-28
Abstract
Abstract A plasma source of charged particles is provided by an arrangement having two solenoids mounted on a single axis and connected in opposition in a gas-discharge chamber to set up a magnetic field increasing along the radius; the arrangement also includes two electrodes in the gas-discharge chamber one of which made in the shape of a disk having at least one emission slit placed approximately on the median surface of the magnetic field, and a system of charged perticle extraction, acceleration and focusing.
Inventors
- 👤 N Semashko
- 👤 I Chukhin
- 👤 N Pleshivtsev
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:36
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/24; H01; H01J; H01J27/00; H01J27/02; H05H1/54; Y; Y10; Y10S; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
146 words
A plasma source of charged particles comprising: a gasdischarge chamber; two solenoids mounted on a single axis passing through said discharge chamber, electrically connected in opposition and designed to set up a magnetic field increasing along the radius; two electrodes mounted in said discharge chamber, a first one of which has the shape of a disk with at least one emission slit and positioned approximately on a median surface of said magnetic field, said electrodes designed for creating a radial discharge in said gas-discharge chamber close to the median surface of said magnetic field; a system of extraction, acceleration and focusing of the charged particles obtained in the source, said system being located on the outside of said gas-discharge chamber close to the emission slit of said electrode; and sources of supply for said solenoids, electrodes and system of extraction, acceleration and focusing of charged particles.
Claim 2
Dependent Claim
146 words
A plasma source of charged particles comprising: a gasdischarge chamber; two solenoids mounted on a single axis passing through said discharge chamber, electrically connected in opposition and designed to set up a magnetic field increasing along the radius; two electrodes mounted in said discharge chamber, a first one of which has the shape of a disk with at least one emission slit and positioned approximately on a median surface of said magnetic field, said electrodes designed for creating a radial discharge in said gas-discharge chamber close to the median surface of said magnetic field; a system of extraction, acceleration and focusing of the charged particles obtained in the source, said system being located on the outside of said gas-discharge chamber close to the emission slit of said electrode; and sources of supply for said solenoids, electrodes and system of extraction, acceleration and focusing of charged particles.
Claim 3
Dependent Claim
31 words
A plasma source, as of claim 1, which has a third solenoid mounted on the extension of the axis of said second solenoid and performing the function of a focusing system.
Claim 4
Dependent Claim
19 words
A plasma source of charged particles, as of claim 1, in which said solenoids are provided with soft-iron shields.
Claim 5
Dependent Claim
19 words
A plasma source of charged particles, as of claim 1, which said solenoids can be displaced along their axis.
Claim 6
Dependent Claim
45 words
A plasma source of charged particles, as of claim 1, in which said disk-shaped electrode is connected as an anode and made in the shape of a funnel having its mouth disposed toward said median surface, said second electrode being connected to be a cathode.
Claim 7
Dependent Claim
39 words
A plasma source of charged particles, as of claim 5, which is equipped with a third electrode in the shape of a ring positioned on said median surface coaxially with said anode and connected to perform as an anticathode.
Claim 8
Dependent Claim
33 words
A plasma source of charged particles, as of claim 5, which is equipped with an additional second anode analogous to said first one and symmetrical to it with respect to said median surface.
Claim 9
Dependent Claim
33 words
A plasma source of charged particlEs, as of claim 7, which is equipped with a third anode in the shape of a ring positioned on said median surface coaxially with said disk-shaped anodes.
Claim 10
Dependent Claim
79 words
A plasma source of charged particles, as of claim 5, in which said second electrode is connected as a directly heated cathode and is made up an external cylinder and an inner coaxial cylinder positioned coaxially with said disk-shaped anode and passing through a central hole in said anode. 10 A plasma source, as of claim 9, in which on the outer surface of said external cylinder there is an emissive coating in a region adjoining said median surface.
Claim 11
Dependent Claim
36 words
A plasma source of charged particles, as of claim 9, in which said external cylinder has a plurality of longitudinal slits uniformly spread along the circumference of the cylinder in a region adjoining said median surface.
Claim 12
Dependent Claim
72 words
A plasma source of charged particles, as of claim 5, in which a second electrode of said electrodes is connected as an indirectly heated cathode and made in the shape of a ring positioned coaxially with said anode on said median surface, and made of a material having a high emissive power and providing uniform emission about the entire working area of the cathode, and equipped with a device for ring heating.
Claim 13
Dependent Claim
75 words
A plasma source of charged particles, as of claim 5, in which said second electrode is connected as a directly heated cathode and made in the shape of a disk with a cross-section varying along its radius, providing uniform emission of electrons about the entire surface of the disk and positioned coaxially with said disk-shaped anode at a distance from said median surface providing for plasma extraction into a region immediately adjoining said median surface.
Claim 14
Dependent Claim
63 words
A plasma source of charged particles, as of claim 5, in which said second electrode is connected as an indirectly heated cathode and made in the shape of a disk positioned coaxially with said disk-shaped anode at a distance from said median surface providing for plasma extraction into a region immediately adjoining said median surface, and equipped with a device for disk heating.
Claim 15
Dependent Claim
61 words
A plasma source of charged particles, as of claim 5, in which said second electrode is a hollow cathode made up of two coaxial tubes connected together at one end positioned coaxially with said disk-shaped anode at a distance from said median surface providing for electron ejection from the inner tube and plasma formation in a region adjoining said median surface.
Claim 16
Dependent Claim
48 words
A plasma source of charged particles, as of claim 5, in which said second electrode is connected as a cathode and shaped like a ring positioned on said median surface coaxially with said disk-shaped anode close to said emission slit of said anode which has a circular configuration.
Claim 17
Dependent Claim
110 words
A plasma source of charged particles, as of claim 1, in which said disk-shaped electrode is a cold cathode shaped like a funnel with the mouth toward said median surface, said second electrode is connected as an anode and shaped like a rod positioned coaxially with said disk-shaped electrode, with its end pressed against said median surface, and there is a third electrode which is cold cathode, analogous to said first electrode and symmetrical to said first electrode with respect to said median surface, and a fourth electrode which is also a cold cathode in the shape of a ring positioned on said median surface coaxially with said disk-shaped electrode.
Claim 18
Dependent Claim
30 words
A plasma source of charged particles, as of claim 1, having a plurality of emission slits which are radial and spread uniformly about the entire surface of said disk-shaped electrode.
Claim 19
Dependent Claim
123 words
A plasma source of charged particles, as of claim 18, in which said system of electrodes for the extration, acceleration and focusing of charged particles is built around two disk-shaped electrodes with concentric circular slits on a side of said disk-shaped electrode external with respect to said median surface in order to create a discharge at a distance providing for the extraction and focusing Of hollow beams of charged particles in the direction of the axis of said solenoids, as well as providing for the electric stability of said system of electrodes for the extraction, acceleration and focusing of particles, and wherein said circular slits of the electrodes of the system of extraction are aligned opposite said emission slits of the discharge-producing electrodes.
Claim 20
Dependent Claim
30 words
A plasma source of charged particles, as of claim 1, having a plurality of emission slits which are radial and distributed uniformly about the entire surface of said disk-shaped electrode.
Claim 21
Dependent Claim
128 words
A plasma source of charged particles, as of claim 19, in which said system of electrodes for the extraction, acceleration and focusing of charged particles is built around two disk-shaped electrodes with radial slits uniformly spread about the entire surface of the electrodes, situated on a side of said disk-shaped electrode external with respect to said median surface in order to provide a discharge at a distance providing for the extraction and focusing of charged particles in the direction of the axis of said solenoids, as well as providing for the dielectric strength of said system of electrodes for the extraction, acceleration and focusing of particles, and wherein said slits of the electrodes of the system of extraction are aligned opposite said emission slits of the discharge-producing electrodes.
References Cited (Backward Citations)
US3456146A
Cited
US3377506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |