The role of the nφ=1 column mode in spheromak formation

被引：11

作者：

Cohen, B. I. ^{[1
]}

Romero-Talamas, C. A. ^{[1
,2
]}

Ryutov, D. D. ^{[1
]}

Hooper, E. B. ^{[1
]}

LoDestro, L. L. ^{[1
]}

McLean, H. S. ^{[1
]}

Stewart, T. L. ^{[1
]}

Wood, R. D. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[2] Univ Maryland, IREAP, College Pk, MD 20742 USA

来源：

PHYSICS OF PLASMAS | 2009年 / 16卷 / 04期

关键词：

N=1 MODE; SUSTAINMENT; STABILITY; PLASMA;

D O I：

10.1063/1.3097909

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：

Observations in strongly driven spheromak experiments and simulations using a time-dependent, three-dimensional, nonlinear, resistive magnetohydrodynamic code indicate that in the formation phase an n(phi)=1 instability (n(phi) is the toroidal Fourier mode) is excited by the current-carrying column injected from the gun region. The growth of the n(phi)=1 column mode terminates in a violent event in which there is significant magnetic reconnection and a topology change. The combined action of the n(phi)=1 kink instability and the reconnection event amplifies the poloidal flux. By means of experimental diagnostics, detailed diagnostics and visualizations in the simulations, and a phenomenological model of the linear perturbations, we investigate the roles of the n(phi)=1 column mode and reconnection in forming the spheromak. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3097909]

引用

页数：15

共 40 条

[1]

ABRAMOWITZ M, 1970, HDB MATH FUNCTIONS, pCH9

[2]

BELLAN PM, 2000, SPHEROMAKS PRACTICAL, pCH3

[3]

Braginskii S. I., 1965, Rev. Plasma Phys, V1, P205

[4] Stability studies and the origin of the n=1 mode in the SPHEX spheromak experiment [J].