US3607627A
Expired / Lapsed
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Stellarator configuration utilizing internal separatrices
Assignee: United States Atomic Energy Commission
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Filing: 1968-10-10
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Granted: 1971-09-21
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Expires: 1988-10-10
Abstract
Abstract Stellarator having internal separatrices such that the equilibrium properties are favorable for stability and stellarator method for providing a stable equilibrium region for confining a plasma both inside and outside the internal separatrices, and for maximizing the three functions of large rotational transform, strong shear theta , and deep well V''''.
Inventors
- 👤 Harold P Furth
- 👤 John L Johnson
- 👤 George V Sheffield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:11
CPC Classifications
G; G21; G21B; G21B1/00; G21B1/05; G21B1/055; Y; Y02; Y02E; Y02E30/00; Y02E30/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
22 words
The invention of claim 1 in which said internal magnetic separatrix 2 forms a triangular cross section having three sharp corners 12.
Claim 2
Dependent Claim
53 words
The invention of claim 1 in which said confinement tube 17 has a large ratio of major to minor radius, and said helical windings 14 have perfect helical symmetry forming helixes of the same pitch for providing a rotational transform Iota , strong shear theta , and deep negative average magnetic wells V''''.
Claim 3
Dependent Claim
60 words
The invention of claim 1 having stagnation lines located to make V'' a maximum on said internal magnetic separatrix 2 and decreasing immediately outside thereof, a rotational transform Iota on said internal magnetic separatrix 2 of 2 pi , and both large rotational transform Iota and large shear theta in a strong negative V'''' region just outside said separatrix 2.
Claim 4
Dependent Claim
53 words
The invention of claim 1 in which said helical windings 14 comprise n turns at radius a each twisting around the axis of said confinement tube 17 in the direction of the field Bo produced by said axial solenoid coil so that each turn is located at theta (kz+n) and carries In current.
Claim 5
Dependent Claim
50 words
The invention of claim 1 in which said helical windings 14, comprise three helical wires, 120* apart at radius a, and have equal currents In directed therein along the field B produced by said axial solenoid 15 and wherein the current In r/a 2 1/3 in the helical windings 14.
Claim 6
Dependent Claim
48 words
The invention of claim 1 in which said internal magnetic separatrix 2 represents a magnetic flux surface in a set 9 of said nested magnetic surfaces 7, outside of which said nested magnetic surfaces 7, have a different shape from those on the inside of said separatrix 2.
Claim 7
Dependent Claim
20 words
The invention of claim 1 in which said internal magnetic separatrix 2 has lobes 13 forming inherent natural divertors 21.
Claim 8
Dependent Claim
41 words
The invention of claim 1 in which said helical windings 14, comprise conductors that carry different amounts of current in the same direction in neighboring conductors so as selectively to reinforce the magnetic surfaces 7 produced by said axial solenoid 15.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |