High non-inductive fraction H-mode discharges generated by high-harmonic fast wave heating and current drive in the National Spherical Torus Experiment

G. Taylor; J. C. Hosea; C. E. Kessel; B. P. Leblanc; D. Mueller; C. K. Phillips; E. J. Valeo; J. R. Wilson; P. M. Ryan; P. T. Bonoli; J. C. Wright; R. W. Harvey

doi:10.1063/1.3699364

High non-inductive fraction H-mode discharges generated by high-harmonic fast wave heating and current drive in the National Spherical Torus Experiment

G. Taylor, J. C. Hosea, C. E. Kessel, B. P. Leblanc, D. Mueller, C. K. Phillips, E. J. Valeo, J. R. Wilson, P. M. Ryan, P. T. Bonoli, J. C. Wright, R. W. Harvey

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Abstract

A deuterium H-mode discharge with a plasma current of 300 kA, an axial toroidal magnetic field of 0.55 T, and a calculated non-inductive plasma current fraction of 0.7-1 has been generated in the National Spherical Torus Experiment by 1.4 MW of 30 MHz high-harmonic fast wave (HHFW) heating and current drive. Seventy-five percent of the non-inductive current was generated inside an internal transport barrier that formed at a normalized minor radius ∼0.4. Three quarters of the non-inductive current was bootstrap current, and the remaining non-inductive current was generated directly by HHFW power inside a normalized minor radius ∼0.2.

Original language	English (US)
Article number	042501
Journal	Physics of Plasmas
Volume	19
Issue number	4
DOIs	https://doi.org/10.1063/1.3699364
State	Published - Apr 2012

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.3699364

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Taylor, G., Hosea, J. C., Kessel, C. E., Leblanc, B. P., Mueller, D., Phillips, C. K., Valeo, E. J., Wilson, J. R., Ryan, P. M., Bonoli, P. T., Wright, J. C., & Harvey, R. W. (2012). High non-inductive fraction H-mode discharges generated by high-harmonic fast wave heating and current drive in the National Spherical Torus Experiment. Physics of Plasmas, 19(4), Article 042501. https://doi.org/10.1063/1.3699364

@article{4bdaef4b2d534e43af4c8fb56f618f6b,

title = "High non-inductive fraction H-mode discharges generated by high-harmonic fast wave heating and current drive in the National Spherical Torus Experiment",

abstract = "A deuterium H-mode discharge with a plasma current of 300 kA, an axial toroidal magnetic field of 0.55 T, and a calculated non-inductive plasma current fraction of 0.7-1 has been generated in the National Spherical Torus Experiment by 1.4 MW of 30 MHz high-harmonic fast wave (HHFW) heating and current drive. Seventy-five percent of the non-inductive current was generated inside an internal transport barrier that formed at a normalized minor radius ∼0.4. Three quarters of the non-inductive current was bootstrap current, and the remaining non-inductive current was generated directly by HHFW power inside a normalized minor radius ∼0.2.",

author = "G. Taylor and Hosea, \{J. C.\} and Kessel, \{C. E.\} and Leblanc, \{B. P.\} and D. Mueller and Phillips, \{C. K.\} and Valeo, \{E. J.\} and Wilson, \{J. R.\} and Ryan, \{P. M.\} and Bonoli, \{P. T.\} and Wright, \{J. C.\} and Harvey, \{R. W.\}",

year = "2012",

month = apr,

doi = "10.1063/1.3699364",

language = "English (US)",

volume = "19",

journal = "Physics of Plasmas",

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publisher = "American Institute of Physics",

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Taylor, G, Hosea, JC, Kessel, CE, Leblanc, BP, Mueller, D, Phillips, CK, Valeo, EJ, Wilson, JR, Ryan, PM, Bonoli, PT, Wright, JC & Harvey, RW 2012, 'High non-inductive fraction H-mode discharges generated by high-harmonic fast wave heating and current drive in the National Spherical Torus Experiment', Physics of Plasmas, vol. 19, no. 4, 042501. https://doi.org/10.1063/1.3699364

TY - JOUR

T1 - High non-inductive fraction H-mode discharges generated by high-harmonic fast wave heating and current drive in the National Spherical Torus Experiment

AU - Taylor, G.

AU - Hosea, J. C.

AU - Kessel, C. E.

AU - Leblanc, B. P.

AU - Mueller, D.

AU - Phillips, C. K.

AU - Valeo, E. J.

AU - Wilson, J. R.

AU - Ryan, P. M.

AU - Bonoli, P. T.

AU - Wright, J. C.

AU - Harvey, R. W.

PY - 2012/4

Y1 - 2012/4

N2 - A deuterium H-mode discharge with a plasma current of 300 kA, an axial toroidal magnetic field of 0.55 T, and a calculated non-inductive plasma current fraction of 0.7-1 has been generated in the National Spherical Torus Experiment by 1.4 MW of 30 MHz high-harmonic fast wave (HHFW) heating and current drive. Seventy-five percent of the non-inductive current was generated inside an internal transport barrier that formed at a normalized minor radius ∼0.4. Three quarters of the non-inductive current was bootstrap current, and the remaining non-inductive current was generated directly by HHFW power inside a normalized minor radius ∼0.2.

AB - A deuterium H-mode discharge with a plasma current of 300 kA, an axial toroidal magnetic field of 0.55 T, and a calculated non-inductive plasma current fraction of 0.7-1 has been generated in the National Spherical Torus Experiment by 1.4 MW of 30 MHz high-harmonic fast wave (HHFW) heating and current drive. Seventy-five percent of the non-inductive current was generated inside an internal transport barrier that formed at a normalized minor radius ∼0.4. Three quarters of the non-inductive current was bootstrap current, and the remaining non-inductive current was generated directly by HHFW power inside a normalized minor radius ∼0.2.

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SN - 1070-664X

VL - 19

JO - Physics of Plasmas

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IS - 4

M1 - 042501

ER -

High non-inductive fraction H-mode discharges generated by high-harmonic fast wave heating and current drive in the National Spherical Torus Experiment

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