The National Spherical Torus Experiment (NSTX) has explored the effects of shaping on plasma performance as determined by many diverse topics including the stability of global magnetohydrodynamic (MHD) modes (e.g., ideal external kinks and resistive wall modes), edge localized modes (ELMs), bootstrap current drive, divertor flux expansion, and heat transport. Improved shaping capability has been crucial to achieving . Precise plasma shape control has been achieved on NSTX using real-time equilibrium reconstruction. NSTX has simultaneously achieved elongation and triangularity . Ideal MHD theory predicts increased stability at high values of shaping factor , which has been observed at large values of the on NSTX. The behavior of ELMs is observed to depend on plasma shape. A description of the ELM regimes attained as shape is varied will be presented. Increased shaping is predicted to increase the bootstrap fraction at fixed . The achievement of strong shaping has enabled operation with pulses with , and for for . Analysis of the noninductive current fraction as well as empirical analysis of the achievable plasma pulse length as elongation is varied will be presented. Data are presented showing a reduction in peak divertor heat load due to increasing in flux expansion.
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Research Article|
May 26 2006
Effect of plasma shaping on performance in the National Spherical Torus Experimenta)
D. A. Gates;
D. A. Gates
c)
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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R. Maingi;
R. Maingi
4
Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831
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J. Menard;
J. Menard
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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S. Kaye;
S. Kaye
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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S. A. Sabbagh;
S. A. Sabbagh
2Department of Applied Physics,
Columbia University
, New York, New York 10027
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G. Taylor;
G. Taylor
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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J. R. Wilson;
J. R. Wilson
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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M. G. Bell;
M. G. Bell
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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R. E. Bell;
R. E. Bell
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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S. Bernabei;
S. Bernabei
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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J. Bialek;
J. Bialek
2Department of Applied Physics,
Columbia University
, New York, New York 10027
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T. Biewer;
T. Biewer
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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W. Blanchard;
W. Blanchard
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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J. Boedo;
J. Boedo
3
University of California
, San Diego, California 92093
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C. Bush;
C. Bush
4
Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831
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M. D. Carter;
M. D. Carter
4
Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831
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W. Choe;
W. Choe
5
Korea Advanced Institute of Science and Technology
, Taejon 305-701, Republic of Korea
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N. Crocker;
N. Crocker
6
University of California
, Los Angeles, California 94524
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D. S. Darrow;
D. S. Darrow
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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W. Davis;
W. Davis
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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L. Delgado-Aparicio;
L. Delgado-Aparicio
7
Johns Hopkins University
, Baltimore, Maryland 21218
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S. Diem;
S. Diem
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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J. Ferron;
J. Ferron
8
General Atomics
, San Diego, California 92186
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A. Field;
A. Field
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Euratom-UKAEA Fusion Associates
, Abingdon, Oxfordshire OX14 3DB, United Kingdom
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J. Foley;
J. Foley
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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E. D. Fredrickson;
E. D. Fredrickson
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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R. E. Hatcher;
R. E. Hatcher
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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W. Heidbrink;
W. Heidbrink
11
University of California
, Irvine, California 92967
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K. Hill;
K. Hill
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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J. C. Hosea;
J. C. Hosea
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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T. R. Jarboe;
T. R. Jarboe
12
University of Washington
, Seattle, Washington 98195
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D. W. Johnson;
D. W. Johnson
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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R. Kaita;
R. Kaita
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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C. Kessel;
C. Kessel
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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S. Kubota;
S. Kubota
6
University of California
, Los Angeles, California 94524
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H. W. Kugel;
H. W. Kugel
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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J. Lawson;
J. Lawson
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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B. P. LeBlanc;
B. P. LeBlanc
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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K. C. Lee;
K. C. Lee
13
University of California
, Davis, California 95616
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F. Levinton;
F. Levinton
14
Nova Photonics
, Princeton, New Jersey 08540
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J. Manickam;
J. Manickam
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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R. Maqueda;
R. Maqueda
14
Nova Photonics
, Princeton, New Jersey 08540
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R. Marsala;
R. Marsala
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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D. Mastrovito;
D. Mastrovito
1Princeton Plasma Physics Laboratory,
Princeton University
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T. K. Mau;
T. K. Mau
3
University of California
, San Diego, California 92093
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S. S. Medley;
S. S. Medley
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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H. Meyer;
H. Meyer
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Euratom-UKAEA Fusion Associates
, Abingdon, Oxfordshire OX14 3DB, United Kingdom
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D. R. Mikkelsen;
D. R. Mikkelsen
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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D. Mueller;
D. Mueller
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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T. Munsat;
T. Munsat
15
University of Colorado
, Boulder, Colorado 80309
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B. A. Nelson;
B. A. Nelson
12
University of Washington
, Seattle, Washington 98195
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C. Neumeyer;
C. Neumeyer
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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N. Nishino;
N. Nishino
16
Hiroshima University
, Hiroshima 739-8511, Japan
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M. Ono;
M. Ono
1Princeton Plasma Physics Laboratory,
Princeton University
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H. Park;
H. Park
1Princeton Plasma Physics Laboratory,
Princeton University
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W. Park;
W. Park
1Princeton Plasma Physics Laboratory,
Princeton University
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S. Paul;
S. Paul
1Princeton Plasma Physics Laboratory,
Princeton University
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W. Peebles;
W. Peebles
6
University of California
, Los Angeles, California 94524
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M. Peng;
M. Peng
4
Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831
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C. Phillips;
C. Phillips
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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A. Pigarov;
A. Pigarov
3
University of California
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R. Pinsker;
R. Pinsker
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General Atomics
, San Diego, California 92186
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A. Ram;
A. Ram
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Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139
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S. Ramakrishnan;
S. Ramakrishnan
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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R. Raman;
R. Raman
12
University of Washington
, Seattle, Washington 98195
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D. Rasmussen;
D. Rasmussen
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Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831
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M. Redi;
M. Redi
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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M. Rensink;
M. Rensink
18
Lawrence Livermore National Laboratory
, Livermore, California 94550
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G. Rewoldt;
G. Rewoldt
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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J. Robinson;
J. Robinson
1Princeton Plasma Physics Laboratory,
Princeton University
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P. Roney
1Princeton Plasma Physics Laboratory,
Princeton University
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L. Roquemore;
L. Roquemore
1Princeton Plasma Physics Laboratory,
Princeton University
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E. Ruskov;
E. Ruskov
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University of California
, Irvine, California 92967
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P. Ryan;
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Oak Ridge National Laboratory
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H. Schneider;
H. Schneider
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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C. H. Skinner;
C. H. Skinner
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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D. R. Smith;
D. R. Smith
1Princeton Plasma Physics Laboratory,
Princeton University
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A. Sontag;
A. Sontag
2Department of Applied Physics,
Columbia University
, New York, New York 10027
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V. Soukhanovskii;
V. Soukhanovskii
18
Lawrence Livermore National Laboratory
, Livermore, California 94550
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T. Stevenson;
T. Stevenson
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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D. Stotler
1Princeton Plasma Physics Laboratory,
Princeton University
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B. Stratton
1Princeton Plasma Physics Laboratory,
Princeton University
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D. Stutman;
D. Stutman
7
Johns Hopkins University
, Baltimore, Maryland 21218
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D. Swain;
D. Swain
4
Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831
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E. Synakowski;
E. Synakowski
1Princeton Plasma Physics Laboratory,
Princeton University
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Y. Takase;
Y. Takase
19
Tokyo University
, Tokyo 113-8654, Japan
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K. Tritz;
K. Tritz
7
Johns Hopkins University
, Baltimore, Maryland 21218
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A. von Halle;
A. von Halle
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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M. Wade;
M. Wade
4
Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831
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R. White;
R. White
1Princeton Plasma Physics Laboratory,
Princeton University
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J. Wilgen;
J. Wilgen
4
Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831
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M. Williams;
M. Williams
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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W. Zhu;
W. Zhu
2Department of Applied Physics,
Columbia University
, New York, New York 10027
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S. J. Zweben;
S. J. Zweben
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543
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R. Akers;
R. Akers
9
Euratom-UKAEA Fusion Associates
, Abingdon, Oxfordshire OX14 3DB, United Kingdom
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P. Beiersdorfer;
P. Beiersdorfer
18
Lawrence Livermore National Laboratory
, Livermore, California 94550
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R. Betti;
R. Betti
20
University of Rochester
, Rochester, New York 14627
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T. Bigelow
T. Bigelow
4
Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831
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Phys. Plasmas 13, 056122 (2006)
Article history
Received:
October 27 2005
Accepted:
March 30 2006
Citation
D. A. Gates, R. Maingi, J. Menard, S. Kaye, S. A. Sabbagh, G. Taylor, J. R. Wilson, M. G. Bell, R. E. Bell, S. Bernabei, J. Bialek, T. Biewer, W. Blanchard, J. Boedo, C. Bush, M. D. Carter, W. Choe, N. Crocker, D. S. Darrow, W. Davis, L. Delgado-Aparicio, S. Diem, J. Ferron, A. Field, J. Foley, E. D. Fredrickson, R. Harvey, R. E. Hatcher, W. Heidbrink, K. Hill, J. C. Hosea, T. R. Jarboe, D. W. Johnson, R. Kaita, C. Kessel, S. Kubota, H. W. Kugel, J. Lawson, B. P. LeBlanc, K. C. Lee, F. Levinton, J. Manickam, R. Maqueda, R. Marsala, D. Mastrovito, T. K. Mau, S. S. Medley, H. Meyer, D. R. Mikkelsen, D. Mueller, T. Munsat, B. A. Nelson, C. Neumeyer, N. Nishino, M. Ono, H. Park, W. Park, S. Paul, W. Peebles, M. Peng, C. Phillips, A. Pigarov, R. Pinsker, A. Ram, S. Ramakrishnan, R. Raman, D. Rasmussen, M. Redi, M. Rensink, G. Rewoldt, J. Robinson, P. Roney, L. Roquemore, E. Ruskov, P. Ryan, H. Schneider, C. H. Skinner, D. R. Smith, A. Sontag, V. Soukhanovskii, T. Stevenson, D. Stotler, B. Stratton, D. Stutman, D. Swain, E. Synakowski, Y. Takase, K. Tritz, A. von Halle, M. Wade, R. White, J. Wilgen, M. Williams, W. Zhu, S. J. Zweben, R. Akers, P. Beiersdorfer, R. Betti, T. Bigelow; Effect of plasma shaping on performance in the National Spherical Torus Experiment. Phys. Plasmas 1 May 2006; 13 (5): 056122. https://doi.org/10.1063/1.2198174
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