Stellarator

A stellarator is a magnetic confinement device. The rotational transform is predominantly generated by external coils - as opposed to a tokamak, in which the poloidal field is generated by plasma currents. Hybrid concepts (including the concepts known as quasi-axisymmetry and quasi-omnigeneity) employ both external coils and self-generated (bootstrap) currents (e.g. NCSX).

NCSX plasma vessel.

Defunct stellarators

• ATF (Oak Ridge, TN, USA)
• CHS (Japan)
• NCSX (Princeton, NJ, USA) - cancelled before construction was completed
• W7-AS (Garching, Germany, 1988-2002)

Operational stellarators

• CAT/CTH (Auburn, USA)
• H-1NF (Canberra, Australia)
• Heliotron-J (Kyoto, Japan)
• HSX (Madison, WI, USA)
• LHD (Toki, Japan)
• TJ-II (Madrid, Spain)
• TJ-K (Stuttgart, Germany) - formerly TJ-IU
• TU Heliac (Tohoku Univ., Sendai, Japan)
• UST-1 (Spain) - tabletop experiment
• WEGA (Greifswald, Germany)

Future stellarators

• W7-X (under construction, Greifswald, Germany)
• QPS (in design phase, TN, USA)

See also

• Stellarator reactor
• International Stellarator and Heliotron Workshop
• Stellarator symmetry
• Stellarator News
• ARIES Project (conceptual design of a compact stellarator)
• Spherical Stellarator design study