Ideal saturated MHD helical structures in axisymmetric hybrid plasmas

被引：18

作者：

Brunetti, D. ^{[1
]}

Graves, J. P. ^{[1
]}

Cooper, W. A. ^{[1
]}

Terranova, D. ^{[2
]}

机构：

[1] Ecole Polytech Fed Lausanne, Assoc Euratom Confederat Suisse, Ctr Rech Phys Plasmas, CH-1015 Lausanne, Switzerland

[2] EURATOM ENEA Assoc, Consorzio RFX, I-35127 Padua, Italy

来源：

NUCLEAR FUSION | 2014年 / 54卷 / 06期

基金：

瑞士国家科学基金会;

关键词：

plasma; tokamak; RFP; MHD; INTERNAL KINK MODES; NONLINEAR EVOLUTION; TOROIDAL GEOMETRY; Q PROFILES; TOKAMAKS; EQUILIBRIA; OSCILLATIONS; STABILITY;

D O I：

10.1088/0029-5515/54/6/064017

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：

Kinked saturated m = 1 helical structures are frequently observed in tokamak hybrid plasmas and in reversed field pinches (RFP). These modes occur when an extremum in the safety factor is close to, but necessarily resonant with, a low order rational (typically q(min) approximate to 1/1 in tokamaks, and q(max) approximate to 1/7 in RFPs). If the exact resonance can be avoided, the essential character of these modes can be modelled assuming ideal nested magnetic flux surfaces. The methods used to characterize these structures include linear and nonlinear ideal magnetohydrodynamic stability calculations, which evaluate the departure from an axisymmetric plasma state, or equilibrium calculations using a 3D equilibrium code. The extent to which these approaches agree in tokamaks and reverse field pinches is investigated, and compared favourably for the first time with an analytic nonlinear treatment that is valid for arbitrary toroidal mode number.

引用

页数：9

共 25 条

[1] MAGNETIC RECONNECTION AND M = 1 OSCILLATIONS IN CURRENT-CARRYING PLASMAS [J].

ARA, G ;

BASU, B ;

COPPI, B ;

LAVAL, G ;

ROSENBLUTH, MN ;

WADDELL, BV .

ANNALS OF PHYSICS, 1978, 112 (02) :443-476

[2] NONLINEAR STATE OF M=1 INSTABILITY IN TOKAMAKS WITH NONMONOTONIC Q PROFILES [J].

AVINASH ;

HASTIE, RJ ;

TAYLOR, JB ;

COWLEY, SC .

PHYSICAL REVIEW LETTERS, 1987, 59 (23) :2647-2649

[3] NONLINEAR EVOLUTION OF IDEAL INTERNAL KINK MODES IN TOKAMAKS WITH NONMONOTONIC Q PROFILES [J].

AVINASH, K .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1990, 2 (10) :2373-2382

[4] MHD properties in the core of ITER-like hybrid scenarios [J].

Brunetti, D. ;

Cooper, W. A. ;

Graves, J. P. ;

Halpern, F. ;

Wahlberg, C. ;

Luetjens, H. ;

Luciani, J. F. .

JOINT VARENNA-LAUSANNE INTERNATIONAL WORKSHOP 2012, 2012, 401

[5] INTERNAL KINK MODES IN TOROIDAL PLASMAS WITH CIRCULAR CROSS-SECTIONS [J].

BUSSAC, MN ;

PELLAT, R ;

EDERY, D ;

SOULE, JL .

PHYSICAL REVIEW LETTERS, 1975, 35 (24) :1638-1641

[6] NONLINEAR EVOLUTION OF THE INTERNAL KINK IN TOKAMAKS [J].

BUSSAC, MN ;

PELLAT, R .

PHYSICAL REVIEW LETTERS, 1987, 59 (23) :2650-2653

[7] Saturated ideal modes in advanced tokamak regimes in MAST [J].

Chapman, I. T. ;

Hua, M. -D. ;

Pinches, S. D. ;

Akers, R. J. ;

Field, A. R. ;

Graves, J. P. ;

Hastie, R. J. ;

Michael, C. A. .

NUCLEAR FUSION, 2010, 50 (04)

[8] Helical ITER hybrid scenario equilibria [J].

Cooper, W. A. ;

Graves, J. P. ;

Sauter, O. .

PLASMA PHYSICS AND CONTROLLED FUSION, 2011, 53 (02)

[9] Tokamak Magnetohydrodynamic Equilibrium States with Axisymmetric Boundary and a 3D Helical Core [J].

Cooper, W. A. ;

Graves, J. P. ;

Pochelon, A. ;

Sauter, O. ;

Villard, L. .

PHYSICAL REVIEW LETTERS, 2010, 105 (03)

[10]

Freidberg J. P., 1987, IDEAL MAGNETOHYDRODY, P292

← 1 2 3 →