Comprehensive control of resistive wall modes in DIII-D advanced tokamak plasmas

被引：61

作者：

Okabayashi, M. ^{[1
]}

Bogatu, I. N. ^{[2
]}

Chance, M. S. ^{[1
]}

Chu, M. S. ^{[3
]}

Garofalo, A. M. ^{[3
]}

In, Y. ^{[2
]}

Jackson, G. L. ^{[3
]}

La Haye, R. J. ^{[3
]}

Lanctot, M. J. ^{[4
]}

Manickam, J. ^{[1
]}

Marrelli, L. ^{[5
]}

Martin, P. ^{[5
]}

Navratil, G. A. ^{[4
]}

Reimerdes, H. ^{[4
]}

Strait, E. J. ^{[3
]}

Takahashi, H. ^{[1
]}

Welander, A. S. ^{[3
]}

Bolzonella, T. ^{[5
]}

Budny, R. V. ^{[1
]}

Kim, J. S. ^{[2
]}

Hatcher, R. ^{[1
]}

Liu, Y. Q. ^{[6
]}

Luce, T. C. ^{[3
]}

机构：

[1] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[2] FAR TECH Inc, San Diego, CA 92121 USA

[3] Gen Atom Co, San Diego, CA 92186 USA

[4] Columbia Univ, New York, NY 10027 USA

[5] Consorzio RFX, I-35127 Padua, Italy

[6] UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

来源：

NUCLEAR FUSION | 2009年 / 49卷 / 12期

基金：

英国工程与自然科学研究理事会;

关键词：

HIGH-BETA; FEEDBACK STABILIZATION; TEARING MODE; STABILITY; CONFINEMENT; COILS;

D O I：

10.1088/0029-5515/49/12/125003

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：

The resistive wall mode (RWM) and neoclassical tearing mode (NTM) have been simultaneously suppressed in the DIII-D for durations of over 2s at beta values 20% above the no-wall limit with modest electron cyclotron current drive and very low plasma rotation. The achieved plasma rotation was significantly lower than reported previously. However, in this regime where stable operation is obtained, it is not unconditionally guaranteed. Various MHD activities, such as edge localized modes (ELMs) and fishbones, begin to couple to the RWM branch near the no-wall limit; feedback has been useful in improving the discharge stability to such perturbations. Simultaneous operation of slow dynamic error field correction and fast feedback suppressed the pile-up of ELM-induced RWM at a series of ELM events. This result implies that successful feedback operation requires not only direct feedback against unstable RWM but also careful control of MHD-induced RWM aftermath, which is the dynamical response to a small-uncorrected error field near the no-wall beta limit. These findings are extremely useful in defining the challenge of control of the RWM and NTM in the unexplored physics territory of burning plasmas in ITER.

引用

页数：16

共 25 条

[1] Tearing mode stability studies near ideal stability boundaries in DIII-D [J].

Brennan, DP ;

Strait, EJ ;

Turnbull, AD ;

Chu, MS ;

La Haye, RJ ;

Luce, TC ;

Taylor, TS ;

Kruger, S ;

Pletzer, A .

PHYSICS OF PLASMAS, 2002, 9 (07) :2998-3006

[2]

BUTTERY RJ, 2008, J PHYS PLASMAS, V15

[3] KINETIC EXTENSIONS OF MAGNETOHYDRODYNAMICS FOR AXISYMMETRICAL TOROIDAL PLASMAS [J].

CHENG, CZ .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 1992, 211 (01) :1-51

[4] Normal mode approach to modelling of feedback stabilization of the resistive wall mode [J].

Chu, MS ;

Chance, MS ;

Glasser, AH ;

Okabayashi, M .

NUCLEAR FUSION, 2003, 43 (06) :441-454

[5] Chapter 2: Plasma confinement and transport [J].

Department of Electrical Engineering, PSTI, University of California, Los Angeles, CA, United States ;

不详 ;

不详 .

Nucl Fusion, 2007, 6 (S18-S127) :S18-S127

[6] Stability and control of resistive wall modes in high beta, low rotation DIII-D plasmas [J].

Garofalo, A. M. ;

Jackson, G. L. ;

La Haye, R. J. ;

Okabayashi, M. ;

Reimerdes, H. ;

Strait, E. J. ;

Ferron, J. R. ;

Groebner, R. J. ;

In, Y. ;

Lanctot, M. J. ;

Matsunaga, G. ;

Navratil, G. A. ;

Solomon, W. M. ;

Takahashi, H. ;

Takechi, M. ;

Turnbull, A. D. .

NUCLEAR FUSION, 2007, 47 (09) :1121-1130

[7] Access to sustained high-beta with internal transport barrier and negative central magnetic shear in DIII-D [J].

Garofalo, A. M. ;

Doyle, E. J. ;

Ferron, J. R. ;

Greenfield, C. M. ;

Groebner, R. J. ;

Hyatt, A. W. ;

Jackson, G. L. ;

Jayakumar, R. J. ;

Kinsey, J. E. ;

La Haye, R. J. ;

McKee, G. R. ;

Murakami, M. ;

Okabayashi, M. ;

Osborne, T. H. ;

Petty, C. C. ;

Politzer, P. A. ;

Reimerdes, H. ;

Scoville, J. T. ;

Solomon, W. M. ;

John, H. E. St. ;

Strait, E. J. ;

Turnbull, A. D. ;

Wade, M. R. ;

VanZeeland, M. A. .

PHYSICS OF PLASMAS, 2006, 13 (05)

[8] Stabilization of the external kink and control of the resistive wall mode in tokamaks [J].

Garofalo, AM ;

Turnbull, AD ;

Strait, EJ ;

Austin, ME ;

Bialek, J ;

Chu, MS ;

Fredrickson, E ;

La Haye, RJ ;

Navratil, GA ;

Lao, LL ;

Lazarus, EA ;

Okabayashi, M ;

Rice, BW ;

Sabbagh, SA ;

Scoville, JT ;

Taylor, TS ;

Walker, ML .

PHYSICS OF PLASMAS, 1999, 6 (05) :1893-1898

[9] Resistive wall mode in collisionless quasistationary plasmas [J].

Hu, B ;

Betti, R .

PHYSICAL REVIEW LETTERS, 2004, 93 (10) :105002-1

[10] Modelling resistive wall modes in ITER with self-consistent inclusion of drift kinetic resonances [J].

Liu, Yueqiang ;

Chu, M. S. ;

Chapman, I. T. ;

Hender, T. C. .

NUCLEAR FUSION, 2009, 49 (03)

← 1 2 3 →