Optimal error field correction (EFC) is thought to be achieved when coupling to the least-stable “dominant” mode of the plasma is nulled at each toroidal mode number (n). The limit of this picture is tested in the DIII-D tokamak by applying superpositions of in- and ex-vessel coil set n = 1 fields calculated to be fully orthogonal to the n = 1 dominant mode. In co-rotating H-mode and low-density Ohmic scenarios, the plasma is found to be, respectively, 7× and 20× less sensitive to the orthogonal field as compared to the in-vessel coil set field. For the scenarios investigated, any geometry of EFC coil can thus recover a strong majority of the detrimental effect introduced by the n = 1 error field. Despite low sensitivity to the orthogonal field, its optimization in H-mode is shown to be consistent with minimizing the neoclassical toroidal viscosity torque and not the higher-order n = 1 mode coupling.
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July 2014
Research Article|
July 09 2014
The importance of matched poloidal spectra to error field correction in DIII-D
C. Paz-Soldan;
C. Paz-Soldan
1General Atomics, P.O. Box 85608, San Diego, California 92121,
USA
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M. J. Lanctot;
M. J. Lanctot
1General Atomics, P.O. Box 85608, San Diego, California 92121,
USA
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N. C. Logan;
N. C. Logan
2
Princeton Plasma Physics Laboratory
, Princeton, New Jersey 08543, USA
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D. Shiraki;
D. Shiraki
3Department of Applied Physics and Applied Mathematics,
Columbia University
, New York, New York 10027, USA
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R. J. Buttery;
R. J. Buttery
1General Atomics, P.O. Box 85608, San Diego, California 92121,
USA
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J. M. Hanson;
J. M. Hanson
3Department of Applied Physics and Applied Mathematics,
Columbia University
, New York, New York 10027, USA
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R. J. La Haye;
R. J. La Haye
1General Atomics, P.O. Box 85608, San Diego, California 92121,
USA
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J.-K. Park;
J.-K. Park
2
Princeton Plasma Physics Laboratory
, Princeton, New Jersey 08543, USA
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W. M. Solomon;
W. M. Solomon
2
Princeton Plasma Physics Laboratory
, Princeton, New Jersey 08543, USA
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E. J. Strait
E. J. Strait
1General Atomics, P.O. Box 85608, San Diego, California 92121,
USA
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b)
Invited speaker
c)
Electronic mail: paz-soldan@fusion.gat.com
a)
Paper TI2 1, Bull. Am. Phys. Soc. 58, 280 (2013).
Phys. Plasmas 21, 072503 (2014)
Article history
Received:
February 14 2014
Accepted:
May 26 2014
Citation
C. Paz-Soldan, M. J. Lanctot, N. C. Logan, D. Shiraki, R. J. Buttery, J. M. Hanson, R. J. La Haye, J.-K. Park, W. M. Solomon, E. J. Strait; The importance of matched poloidal spectra to error field correction in DIII-D. Phys. Plasmas 1 July 2014; 21 (7): 072503. https://doi.org/10.1063/1.4886795
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