US3801438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toroidal apparatus for confining plasma
Assignee: United States Atomic Energy Commission
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Filing: 1970-04-03
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Granted: 1974-04-02
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Expires: 1990-04-03
Abstract
Abstract Toroidal apparatus for confining plasma in which at least three magnetic field producers are provided. One field producer provides a toroidal magnetic field. Another field producer provides a multipolar configuration for the toroidal field. A third field provides rotational transform for the multipolar magnetic field. All of the field producing means are outside of the toroidal confinement region.
Inventors
- 👤 T Ohkawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:43
CPC Classifications
H; H05; H05H; H05H1/00; H05H1/02; H05H1/10; H05H1/12; Y; Y02; Y02E; Y02E30/00; Y02E30/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
24 words
Apparatus in accordance with claim 1 wherein said flux surfaces are substantially symmetric with respect to the major axis of the said toroidal region.
Claim 2
Dependent Claim
22 words
Apparatus in accordance with Claim 1 wherein said coils are two planar coils perpendicular to the major axis of the toroidal region.
Claim 3
Dependent Claim
23 words
Apparatus in accordance with claim 3 wherein said planar coils each comprise a plurality of curved conductors positioned on segments of spiral curves.
Claim 4
Dependent Claim
24 words
Apparatus in accordance with claim 4 wherein said conductors are connected to one another so that current in adjacent conductors flows in opposite directions.
Claim 5
Dependent Claim
29 words
Apparatus in accordance with claim 5 wherein said spiral curves have a clockwise orientation for one of said coils and a counter-clockwise orientation for the other of said coils.
Claim 6
Dependent Claim
25 words
Apparatus in accordance with claim 6 wherein adjacent curved conductors in each coil are connected in series by conductors in the plane of said coil.
Claim 7
Dependent Claim
47 words
Apparatus in accordance with claim 6 including a plurality of straight conductors parallel to the major axis of said toroidal region alternately connecting the curved conductors in one of said coils with the curved conductors in the other of said coils so as to eliminate azimuthal currents.
Claim 8
Dependent Claim
37 words
Apparatus in accordance with claim 1 wherein said first magnetic field producing means comprises a plurality of spaced apart cylindrical coils surrounding said plasma confinement region so that access to said region between said coils is possible.
Claim 9
Dependent Claim
50 words
Apparatus in accordance with claim 1 wherein said second magnetic field producing means is more remote from said toroidal region than both of said other magnetic field producing means and said third magnetic field producing means is more remote from said toroidal region than said first magnetic field producing means.
Claim 10
Dependent Claim
24 words
Apparatus in accordance with claim 1 wherein said first magnetic field producing means comprises a single turn axially symmetrical secondary winding of a transformer.
Claim 11
Dependent Claim
16 words
Apparatus in accordance with claim 11 wherein said housing comprises said first magnetic field producing means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |