Model C stellarator
The Model C stellarator was the first large-scale stellarator to be built, during the early stages of fusion power research. Planned since 1952, construction began in 1961 at what is today the Princeton Plasma Physics Laboratory (PPPL). The Model C followed the table-top sized Model A, and a series of Model B machines that refined the stellarator concept and provided the basis for the Model C, which intended to reach break-even conditions. Model C ultimately failed to reach this goal, producing electron temperatures of 400 eV when about 100,000 were needed. In 1969, after UK researchers confirmed that the USSR's T-3 tokamak was reaching 1000 eV, the Model C was converted to the Symmetrical Tokamak, and stellarator development at PPPL ended.
|Location||Princeton, New Jersey, United States|
|Affiliation||Princeton Plasma Physics Laboratory|
|Minor Radius||5–7.5 m (16–25 ft)|
|Magnetic field||3.5 T (35,000 G)|
|Date(s) of construction||1961|
|Year(s) of operation||1962 – 1969|
|Preceded by||Model A/B stellarators|
|Succeeded by||Symmetric Tokamak (ST)|
The Model C had a racetrack shape. The total length (of the tube axis?) was 1.2m. The plasma could have a 5-7.5 cm minor radius. Magnetic coils could produce a toroidal field (along the tube) of 35,000 Gauss. It was only capable of pulsed operation.
It had helical windings on the curved sections.
An average ion temperature of 400 eV was reached in 1969.
Construction funding/approval was announced in April 1957.
Starts operating March 1962.
- Stix, T. H. (1998). "Highlights in early stellarator research at Princeton" (PDF). J. Plasma Fusion Res. 1: 3–8.
- Princeton Alumni Weekly, Volume 57. April 19. p9
- See 1962
- See 1969,1970
- Experiments on the Model C stellarator. S. Yoshikawa and T.H. Stix
- A CONCEPTUAL DESIGN OF THE MODEL C STELLARATOR. 1956 Says 9" vacuum tube, but 150 ft long seems unlikely. 150,000 kW peak of pulsed power to the magnets.