Neoclassical Transport

Bauer, Frances

doi:10.1016/b978-0-12-082815-9.50008-3

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1994

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“…Recently it has been found that an additional I = 1 helical coil on the axisymmetric toroidal chamber helps to produce more Helias-like magnetic surfaces and form the magnetic well at the vacuum [ 181. For this configuration the MHD properties and the particle confinement are checked by the BETA equilibrium, stability and transport codes [19] and the NSTAB code [20]. Inclusion of this type of helical coil in the Helias-Heliac hybrid stellarator will also be the subject of a future study.…”

Section: Lettersmentioning

confidence: 99%

A Helias-Heliac hybrid stellarator

Yokoyama¹,

Nakamura²,

Wakatani³

1994

Nucl. Fusion

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Placing an 1 = 1 continuous helical coil with a pitch modulation in an axisymmetric toroidal magnetic field, a helical axis configuration was obtained with characteristics similar to the Heiias configuration for Wendelstein 7-X (W7-X). In the four pitch case, a device with an aspect ratio of 4-5 and good accessibility becomes possible, although a very weak magnetic hill exists.In a particular finite 0 magnetohydrodynamic (MHD) equilibrium, the magnetic well appears in the whole region for a central beta value of p(0) -1%. About a quarter of the particles at half radius are lost at f l = 0; however, both the radial electric field and the finite f l effect improve the particle orbit confinement significantly. The possibility of an open divertor is shown.

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Section: Lettersmentioning

confidence: 99%