Recent experiments on DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] and National Spherical Torus Experiment (NSTX) [M. Ono et al, Nucl. Fusion 40, 557 (2000)] have focused on investigating mechanisms of driving rotation in fusion plasmas. The so-called intrinsic rotation is generated by an effective torque, driven by residual stresses in the plasma, which appears to originate in the plasma edge. A clear scaling of this intrinsic drive with the H-mode pressure gradient is observed. Coupled with the experimentally inferred pinch of angular momentum, such an edge source is capable of producing sheared rotation profiles. Intrinsic drive is also possible directly in the core, although the physics mechanisms are much more complex. Another option which is being explored is the use of nonresonant magnetic fields for spinning the plasma. It is found beneficially that the torque from these fields can be enhanced at low rotation, which assists in spinning the plasma from rest, and offers increased resistance against plasma slowing.
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May 2010
Research Article|
March 30 2010
Mechanisms for generating toroidal rotation in tokamaks without external momentum inputa)
W. M. Solomon;
W. M. Solomon
c)
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543, USA
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K. H. Burrell;
K. H. Burrell
2
General Atomics
, P.O. Box 85608, San Diego, California 92186-5608, USA
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A. M. Garofalo;
A. M. Garofalo
2
General Atomics
, P.O. Box 85608, San Diego, California 92186-5608, USA
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S. M. Kaye;
S. M. Kaye
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543, USA
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R. E. Bell;
R. E. Bell
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543, USA
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A. J. Cole;
A. J. Cole
3
University of Wisconsin
, Madison, Wisconsin 53706-1609, USA
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J. S. deGrassie;
J. S. deGrassie
2
General Atomics
, P.O. Box 85608, San Diego, California 92186-5608, USA
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P. H. Diamond;
P. H. Diamond
4Center for Astrophysics and Space Sciences,
University of California
, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0424, USA
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T. S. Hahm;
T. S. Hahm
1Princeton Plasma Physics Laboratory,
Princeton University
, Princeton, New Jersey 08543, USA
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G. L. Jackson;
G. L. Jackson
2
General Atomics
, P.O. Box 85608, San Diego, California 92186-5608, USA
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M. J. Lanctot;
M. J. Lanctot
5
Columbia University
, New York, New York 10027, USA
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C. C. Petty;
C. C. Petty
2
General Atomics
, P.O. Box 85608, San Diego, California 92186-5608, USA
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H. Reimerdes;
H. Reimerdes
5
Columbia University
, New York, New York 10027, USA
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S. A. Sabbagh;
S. A. Sabbagh
5
Columbia University
, New York, New York 10027, USA
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E. J. Strait;
E. J. Strait
2
General Atomics
, P.O. Box 85608, San Diego, California 92186-5608, USA
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T. Tala;
T. Tala
6Association EURATOM-Tekes,
VTT
, P.O. Box 1000, FIN-02044 VTT, Finland
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R. E. Waltz
R. E. Waltz
2
General Atomics
, P.O. Box 85608, San Diego, California 92186-5608, USA
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c)
Invited speaker. Electronic mail: wsolomon@pppl.gov.
a)
Paper NI3 2, Bull. Am. Phys. Soc. 54, 181 (2009).
Phys. Plasmas 17, 056108 (2010)
Article history
Received:
December 02 2009
Accepted:
February 02 2010
Citation
W. M. Solomon, K. H. Burrell, A. M. Garofalo, S. M. Kaye, R. E. Bell, A. J. Cole, J. S. deGrassie, P. H. Diamond, T. S. Hahm, G. L. Jackson, M. J. Lanctot, C. C. Petty, H. Reimerdes, S. A. Sabbagh, E. J. Strait, T. Tala, R. E. Waltz; Mechanisms for generating toroidal rotation in tokamaks without external momentum input. Phys. Plasmas 1 May 2010; 17 (5): 056108. https://doi.org/10.1063/1.3328521
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