Magnetic surface breaking in three-dimensional l =2 heliotron/torsatron equilibria

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860064· OSTI ID:7113184

Hayashi, T; Takei, A; Sato, T ^[1]

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1. National Institute for Fusion Science, Nagoya 464-01 (Japan)

Magnetic surface breaking due to finite pressure effect is analyzed for three-dimensional magnetohydrodynamic equilibria of {ital l}=2 heliotron/torsatron configuration. Characteristics of magnetic island formation are numerically studied in detail. Main results are as follows: (i) There exists a clear-cut boundary, which practically determines the position of the outermost closed surface. The boundary position shifts as beta increases, though not affected by the external axisymmetric fields. (ii) The clear-cut boundary is maintained for a higher beta plasma as the aspect ratio of the configuration increases. For a low aspect ratio configuration, however, high beta equilibria with clear surfaces can be obtained by controlling the external poloidal field, especially the vertical field. (iii) The external {ital l}=1 field is particularly viable in controlling the breaking of magnetic surfaces.

• OSTI ID: 7113184
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:6; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700370* -- Plasma Fluid & MHD Properties-- (1992-)
CLOSED PLASMA DEVICES
EQUILIBRIUM
HELIOTRON
HIGH-BETA PLASMA
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC ISLANDS
MAGNETIC SURFACES
MHD EQUILIBRIUM
PLASMA
PLASMA SIMULATION
SIMULATION
STELLARATORS
THERMONUCLEAR DEVICES
TORSATRON STELLARATORS