Observation of instability-induced current redistribution in a spherical-torus plasma

被引：85

作者：

Menard, J. E. ^{[1
]}

Bell, R. E.

Gates, D. A.

Kaye, S. M.

LeBlanc, B. P.

Levinton, F. M.

Medley, S. S.

Sabbagh, S. A.

Stutman, D.

Tritz, K.

Yuh, H.

机构：

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

[2] Nova Photon Inc, Princeton, NJ USA

[3] Columbia Univ, New York, NY USA

[4] Johns Hopkins Univ, Baltimore, MD USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.97.095002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A motional Stark effect diagnostic has been utilized to reconstruct the parallel current density profile in a spherical-torus plasma for the first time. The measured current profile compares favorably with neoclassical theory when no large-scale magnetohydrodynamic instabilities are present in the plasma. However, a current profile anomaly is observed during saturated interchange-type instability activity. This apparent anomaly can be explained by redistribution of neutral beam injection current drive and represents the first observation of interchange-type instabilities causing such redistribution. The associated current profile modifications contribute to sustaining the central safety factor above unity for over five resistive diffusion times, and similar processes may contribute to improved operational scenarios proposed for ITER.

引用

页数：4

共 34 条

[1] DIFFUSION DRIVEN PLASMA CURRENTS AND BOOTSTRAP TOKAMAK [J].

BICKERTON, RJ ;

CONNOR, JW ;

TAYLOR, JB .

NATURE-PHYSICAL SCIENCE, 1971, 229 (04) :110-+

[2] Simulations of beam ion transport during tearing modes in the DIII-D tokamak [J].

Carolipio, EM ;

Heidbrink, WW ;

Forest, CB ;

White, RB .

NUCLEAR FUSION, 2002, 42 (07) :853-862

[3] Resistive interchange modes in negative central shear tokamaks with peaked pressure profiles [J].

Chu, MS ;

Greene, JM ;

Lao, LL ;

Miller, RL ;

Bondeson, A ;

Sauter, O ;

Rice, BW ;

Strait, EJ ;

Taylor, TS ;

Turnbull, AD .

PHYSICAL REVIEW LETTERS, 1996, 77 (13) :2710-2713

[4] Reduction in neutral beam driven current in a tokamak by tearing modes [J].

Forest, CB ;

Ferron, JR ;

Gianakon, T ;

Harvey, RW ;

Heidbrink, WW ;

Hyatt, AW ;

LaHaye, RJ ;

Murakami, M ;

Politzer, PA ;

StJohn, HE .

PHYSICAL REVIEW LETTERS, 1997, 79 (03) :427-430

[5] DETERMINATION OF THE NONINDUCTIVE CURRENT PROFILE IN TOKAMAK PLASMAS [J].

FOREST, CB ;

KUPFER, K ;

LUCE, TC ;

POLITZER, PA ;

LAO, LL ;

WADE, MR ;

WHYTE, DG ;

WROBLEWSKI, D .

PHYSICAL REVIEW LETTERS, 1994, 73 (18) :2444-2447

[6] Sustained stabilization of the resistive-wall mode by plasma rotation in the DIII-D tokamak [J].

Garofalo, AM ;

Strait, EJ ;

Johnson, LC ;

La Haye, RJ ;

Lazarus, EA ;

Navratil, GA ;

Okabayashi, M ;

Scoville, JT ;

Taylor, TS ;

Turnbull, AD .

PHYSICAL REVIEW LETTERS, 2002, 89 (23)

[7] Progress towards steady state on NSTX [J].

Gates, DA ;

Kessel, C ;

Menard, J ;

Taylor, G ;

Wilson, JR ;

Bell, MG ;

Bell, RE ;

Bernabei, S ;

Bialek, J ;

Biewer, T ;

Blanchard, W ;

Boedo, J ;

Bush, C ;

Carter, MD ;

Choe, W ;

Crocker, N ;

Darrow, DS ;

Davis, W ;

Delgado-Aparicio, L ;

Diem, S ;

Ferron, J ;

Field, A ;

Foley, J ;

Fredrickson, ED ;

Gibney, T ;

Harvey, R ;

Hatcher, RE ;

Heidbrink, W ;

Hill, K ;

Hosea, JC ;

Jarboe, TR ;

Johnson, DW ;

Kaita, R ;

Kaye, S ;

Kubota, S ;

Kugel, HW ;

Lawson, J ;

LeBlanc, BP ;

Lee, KC ;

Levinton, F ;

Maingi, R ;

Manickam, J ;

Maqueda, R ;

Marsala, R ;

Mastrovito, D ;

Mau, TK ;

Medley, SS ;

Meyer, H ;

Mikkelsen, DR ;

Mueller, D .

NUCLEAR FUSION, 2006, 46 (03) :S22-S28

[8] High β, long pulse, bootstrap sustained scenarios on the National Spherical Torus Experiment (NSTX) [J].

Gates, DA .

PHYSICS OF PLASMAS, 2003, 10 (05) :1659-1664

[9]

Glasser A., 1997, Bull. Am. Phys. Soc, V42, P1848

[10] RESISTIVE INSTABILITIES IN GENERAL TOROIDAL PLASMA CONFIGURATIONS [J].

GLASSER, AH ;

GREENE, JM ;

JOHNSON, JL .

PHYSICS OF FLUIDS, 1975, 18 (07) :875-888

← 1 2 3 4 →