Stellarator

Configurations Several different configurations of stellarator exist, including: ;Torsatron: A stellarator with continuous helical coils.

Stellarator configurations such as the proposed NCSX, a quasi-axisymmetric stellarator design, can be created with negative magnetic shear and positive bootstrap current to achieve stability to the NTM.

Stellarator Stellarator magnetic field Spitzer's innovation was a change in geometry.

The physical shape of the stellarator is defined by magnets that exert the specially shaped field that confines the super-heated plasma necessary for fusion reactions.

The stellarator has permanent magnets, a first for a fusion experiment.

Bozhenov took a detailed look at the experiments and Beidler traced control of the leakage to the advanced design of the stellarator.

As a result of this meeting and a review of the invention by designated scientists throughout the nation, the stellarator proposal was funded in 1951 as Project Matterhorn.

As a result, the stellarator is not "perfect" in terms of canceling out the drift, but the net result is to so greatly reduce drift that long confinement times appeared possible.

As currents were ramped up during the 1980s it appeared that they might represent a serious problem to further improvements in confinement, and the all-magnetic stellarator designs saw renewed interest.

A worked without issue, but even by the time B was being used it was clear the stellarator was also suffering from instabilities and plasma leakage.

Coils are prepared for the experimental stellarator.

Example of a stellarator design, as used in the Wendelstein 7-X experiment: A coil system (blue) surrounds plasma (yellow).

It might be possible to use these additional degrees of design freedom to optimize a stellarator in ways that are not possible with tokamaks.

More recently, in the 1990s, problems with the tokamak concept have led to renewed interest in the stellarator design, citation and a number of new devices have been built.

New stellarator experiments such as NCSX (proposed) will test the prediction that addition of appropriately designed helical coils can stabilize ideal kink modes at high beta, and lower-beta tests of ballooning stability are possible in HSX.

Some important modern stellarator experiments are Wendelstein 7-X in Germany, the Helically Symmetric Experiment (HSX) in the USA, and the Large Helical Device in Japan.

Spitzer's idea won funding and he began work on the stellarator under the code name Project Matterhorn.

Stellarator : These are twisted rings of hot plasma.

The HSX is the first stellarator to use a quasisymmetric magnetic field.