Observation of a nonaxisymmetric magnetohydrodynamic self-organized state

被引：4
|
作者：
Cothran, C. D. [1 ]
Brown, M. R. [1 ]
Gray, T. [1 ]
Schaffer, M. J. [2 ]
Marklin, G. [3 ]
Lukin, V. S. [4 ]
机构：
[1] Swarthmore Coll, Swarthmore, PA 19081 USA
[2] Gen Atom Co, San Diego, CA 92186 USA
[3] Univ Washington, Seattle, WA 98195 USA
[4] USN, Div Space Sci, Res Lab, Washington, DC 20375 USA
来源：
PHYSICS OF PLASMAS | 2010年 / 17卷 / 05期
关键词：
plasma magnetohydrodynamics; plasma toroidal confinement; REVERSED-FIELD-PINCH; TILTING INSTABILITY; RELAXATION; PLASMA;
D O I：
10.1063/1.3327214
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
A nonaxisymmetric stable magnetohydrodynamic (MHD) equilibrium within a prolate cylindrical conducting boundary has been produced experimentally at Swarthmore Spheromak Experiment (SSX) [M. R. Brown , Phys. Plasmas 6, 1717 (1999)]. It has m=1 toroidal symmetry, helical distortion, and flat lambda profile. Each of these observed characteristics are in agreement with the magnetically relaxed minimum magnetic energy Taylor state. The Taylor state is computed using the methods described by A. Bondeson [Phys. Fluids 24, 1682 (1981)] and by J. M. Finn [Phys. Fluids 24, 1336 (1981)] and is compared in detail to the measured internal magnetic structure. The lifetime of this nonaxisymmetric compact torus (CT) is comparable to or greater than that of the axisymmetric CTs produced at SSX; thus suggesting confinement is not degraded by its nonaxisymmetry. For both one- and two-spheromak initial state plasmas, this same equilibrium consistently emerges as the final state. (C) 2010 American Institute of Physics. [doi:10.1063/1.3327214]
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页数：7
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