Wendelstein II-B

WII-B

Wendelstein II-B
The original Wendelstein II-B, preserved in the entrance hall of IPP Greifswald.
Device type	Stellarator
Location	Garching, West Germany
Affiliation	Max Planck Institute for Plasma Physics
Technical specifications
Major radius	0.5 m (1 ft 8 in)[1]
Minor radius	0.05 m (2.0 in)[1]
Magnetic field	1.25 T (12,500 G)[1]
Plasma temperature	< 300 eV[1]
History
Year(s) of operation	1971[1]–1975[2]
Preceded by	Wendelstein II-A
Succeeded by	Wendelstein 7-A

Wendelstein II-B was a stellarator operated from 1971 at the Max Planck Institute for Plasma Physics.^[1] It was built after the failure of the Princeton Model C stellarator and the subsequent US shift to the tokamak type exclusively, following the success of the Soviet T-3 tokamak. The Germans were encouraged by contrary positive results on their own contemporaneous stellarator, Wendelstein II-A, but this machine was much smaller than the Model C. Its successor WII-B began operation the same year as the Princeton conversion of the Model C to a tokamak, whence it was renamed the Symmetrical Tokamak.^[3]

WII-B was a circular classical stellarator, with two pairs of helical electromagnetic coils to produce the stellarator magnetic field, and five field periods around the torus.^[3] It was heated only by gun injection or Ohmic heating and had relatively low heating power. It demonstrated tokamak-like plasma confinement with temperatures up to 300eV. It was followed by the larger and more powerful Wendelstein 7-A stellarator.^[1][4]

• Saturn-1, USSR
• CLASP, UK
• Model C stellarator, USA