What is the potential impact of research on this concept on increasing our knowledge of general plasma physics?
Stellarator research has driven the development of 3-D plasma physics. The theoretical techniques that have been developed have application over a far broader range of physics than just fusion. Three examples are given below. (i) The drift Hamiltonian theory developed for stellarators says particle drift orbits depend funda-mentally on only the magnetic field strength [19]. The most remarkable implication is quasi-helical symmetry [36] in which the drift Hamiltonian has a continuous symmetry and a conserved component of the canonical momentum even though the exact Hamiltonian has no symmetry directions. Experiments on quasi-helical symmetry, such as HSX [37], test this remarkable property of the drift equation. An important application of the drift Hamiltonian technique has been made to electron orbits in a terrella experiment [76], which is designed study the physics of the earth’s radiation belts. (ii) As part of stellarator research, the magnetic field trajectories were shown to be
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