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Columbia Non-neutral Torus : ウィキペディア英語版 | Columbia Non-neutral Torus
The Columbia Non-neutral Torus (CNT) is a small stellarator at the Columbia University Plasma Physics Laboratory designed by Thomas Sunn Pedersen with the aid of Wayne Reiersen and Fred Dahlgren of the Princeton Plasma Physics Laboratory to conduct the first investigation of non-neutral plasmas confined on magnetic surfaces. The experiment, which began operation in November 2004, is funded by the National Science Foundation and the United States Department of Energy in the form of a Faculty Early Career Development (CAREER) award. == Technical Design ==
CNT, which is housed in a cylindrical vacuum chamber made of 316 stainless steel, measures 60 inches in diameter and stands 75 inches tall. The empty chamber is capable of reaching a pressure of 2x10-10 Torr. CNT is unique in its simple geometry. Magnetic surfaces are created using only 4 electromagnetic coils - two interlocking coils inside the chamber, and two poloidal field coils outside the chamber. The two interlocking coils have a radius of .405m, and the angle between them can be manually selected to be 64°, 78°, or 88°, allowing for different shear and rotational transform values, and magnetic surface configuration. The poloidal field coils have a radius of 1.08 m. The coils are powered by a 200 kW power supply and are capable of producing magnetic fields of 0.01-0.2T. The configuration of CNT creates a very low aspect ratio of 1.9, the lowest of any stellarator built.
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