Feedback control of the proximity to marginal RWM stability using active MHD spectroscopy

被引：15

作者：

Hanson, J. M. ^{[1
,2
]}

Reimerdes, H. ^{[1
]}

Lanctot, M. J. ^{[1
]}

In, Y. ^{[3
]}

La Haye, R. J. ^{[4
]}

Jackson, G. L. ^{[4
]}

Navratil, G. A. ^{[1
]}

Okabayashi, M. ^{[5
]}

Sieck, P. E. ^{[4
]}

Strait, E. J. ^{[4
]}

机构：

[1] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA

[2] Oak Ridge Inst Sci Educ, Oak Ridge, TN 37830 USA

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

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

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

来源：

NUCLEAR FUSION | 2012年 / 52卷 / 01期

关键词：

RESISTIVE WALL MODES; STORED ENERGY; STABILIZATION; INSTABILITIES; DISCHARGES; DYNAMICS; ROTATION; PLASMAS; SYSTEM;

D O I：

10.1088/0029-5515/52/1/013003

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：

DIII-D experiments yield the first proof-of-principle results in feedback control of the proximity to the resistive wall mode (RWM) stability boundary using an active MHD spectroscopic stability measurement and neutral beam injection heating. In contrast to calculations of the stability of reconstructed equilibria, the spectroscopic measurement is independent of the assumed RWM stability model. The real-time implementation enables the control system to react to unforeseen changes in plasma parameters and hence stability limits. In the experimentally accessed regime, near but below the ideal-MHD no-wall limit for the n = 1 external kink instability, the control dynamics are described by a linear model that depends on the plasma stored energy. This model is used to aid in optimizing feedback gain settings.

引用

页数：7

共 37 条

[1]

Astrom K.J., 2008, Adaptive control, V2 edn

[2] The role of kinetic effects, including plasma rotation and energetic particles, in resistive wall mode stabilitya) [J].

Berkery, J. W. ;

Sabbagh, S. A. ;

Reimerdes, H. ;

Betti, R. ;

Hu, B. ;

Bell, R. E. ;

Gerhardt, S. P. ;

Manickam, J. ;

Podesta, M. .

PHYSICS OF PLASMAS, 2010, 17 (08)

[3] STABILIZATION OF EXTERNAL-MODES IN TOKAMAKS BY RESISTIVE WALLS AND PLASMA ROTATION [J].

BONDESON, A ;

WARD, DJ .

PHYSICAL REVIEW LETTERS, 1994, 72 (17) :2709-2712

[4] Error field amplification and rotation damping in tokamak plasmas [J].

Boozer, AH .

PHYSICAL REVIEW LETTERS, 2001, 86 (22) :5059-5061

[5] Improved charge coupled device detectors for the edge charge exchange spectroscopy system on the DIII-D tokamak [J].

Burrell, KH ;

Kaplan, DH ;

Gohil, P ;

Nilson, DG ;

Groebner, RJ ;

Thomas, DM .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2001, 72 (01) :1028-1033

[6] DESIGN AND OPERATION OF THE MULTIPULSE THOMSON SCATTERING DIAGNOSTIC ON DIII-D [J].

CARLSTROM, TN ;

CAMPBELL, GL ;

DEBOO, JC ;

EVANKO, R ;

EVANS, J ;

GREENFIELD, CM ;

HASKOVEC, J ;

HSIEH, CL ;

MCKEE, E ;

SNIDER, RT ;

STOCKDALE, R ;

TROST, PK ;

THOMAS, MP .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1992, 63 (10) :4901-4906

[7] Suppression of resistive wall instabilities with distributed, independently controlled, active feedback coils [J].

Cates, C ;

Shilov, M ;

Mauel, ME ;

Navratil, GA ;

Maurer, D ;

Mukherjee, S ;

Nadle, D ;

Bialek, J ;

Boozer, A .

PHYSICS OF PLASMAS, 2000, 7 (08) :3133-3136

[8] Analysis of stable resistive wall modes in a rotating plasma [J].

Garofalo, AM ;

Jensen, TH ;

Strait, EJ .

PHYSICS OF PLASMAS, 2003, 10 (12) :4776-4783

[9] Sustained rotational stabilization of DIII-D plasmas above the no-wall beta limit [J].

Garofalo, AM ;

Jensen, TH ;

Johnson, LC ;

La Haye, RJ ;

Navratil, GA ;

Okabayashi, M ;

Scoville, JT ;

Strait, EJ ;

Baker, DR ;

Bialek, J ;

Chu, MS ;

Ferron, JR ;

Jayakumar, J ;

Lao, LL ;

Makowski, MA ;

Reimerdes, H ;

Taylor, TS ;

Turnbull, AD ;

Wade, MR ;

Wong, SK .

PHYSICS OF PLASMAS, 2002, 9 (05) :1997-2005

[10] Resistive wall mode dynamics and active feedback control in DIII-D [J].

Garofalo, AM ;

Chu, MS ;

Fredrickson, ED ;

Gryaznevich, M ;

Jensen, TH ;

Johnson, LC ;

La Haye, RJ ;

Navratil, GA ;

Okabayashi, M ;

Scoville, JT ;

Strait, EJ ;

Turnbull, AD .

NUCLEAR FUSION, 2001, 41 (09) :1171-1176

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