Advances in high-harmonic fast wave physics in the National Spherical Torus Experiment

G. Taylor; R. E. Bell; J. C. Hosea; B. P. Leblanc; C. K. Phillips; M. Podesta; E. J. Valeo; J. R. Wilson; J. W. Ahn; G. Chen; D. L. Green; E. F. Jaeger; R. Maingi; P. M. Ryan; J. B. Wilgen; W. W. Heidbrink; D. Liu; P. T. Bonoli; T. Brecht; M. Choi; R. W. Harvey

doi:10.1063/1.3371956

Advances in high-harmonic fast wave physics in the National Spherical Torus Experiment

G. Taylor, R. E. Bell, J. C. Hosea, B. P. Leblanc, C. K. Phillips, M. Podesta, E. J. Valeo, J. R. Wilson, J. W. Ahn, G. Chen, D. L. Green, E. F. Jaeger, R. Maingi, P. M. Ryan, J. B. Wilgen, W. W. Heidbrink, D. Liu, P. T. Bonoli, T. Brecht, M. ChoiR. W. Harvey

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Abstract

Improved core high-harmonic fast wave (HHFW) heating at longer wavelengths and during start-up and plasma current ramp-up has now been obtained by lowering the edge density with lithium wall conditioning, thereby moving the critical density for perpendicular fast-wave propagation away from the vessel wall. Lithium conditioning allowed significant HHFW core electron heating of deuterium neutral beam injection (NBI) fuelled H-mode plasmas to be observed for the first time. Large edge localized modes were observed immediately after the termination of rf power. Visible and infrared camera images show that fast wave interactions can deposit considerable rf energy on the outboard divertor. HHFW-generated parametric decay instabilities were observed to heat ions in the plasma edge and may be the cause for a measured drag on edge toroidal rotation during HHFW heating. A significant enhancement in neutron rate and fast-ion profile was measured in NBI-fuelled plasmas when HHFW heating was applied.

Original language	English (US)
Article number	056114
Journal	Physics of Plasmas
Volume	17
Issue number	5
DOIs	https://doi.org/10.1063/1.3371956
State	Published - May 2010

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.3371956

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Taylor, G., Bell, R. E., Hosea, J. C., Leblanc, B. P., Phillips, C. K., Podesta, M., Valeo, E. J., Wilson, J. R., Ahn, J. W., Chen, G., Green, D. L., Jaeger, E. F., Maingi, R., Ryan, P. M., Wilgen, J. B., Heidbrink, W. W., Liu, D., Bonoli, P. T., Brecht, T., ... Harvey, R. W. (2010). Advances in high-harmonic fast wave physics in the National Spherical Torus Experiment. Physics of Plasmas, 17(5), Article 056114. https://doi.org/10.1063/1.3371956

@article{1947dc4f9f2c4eabac8a8adf57c4a045,

title = "Advances in high-harmonic fast wave physics in the National Spherical Torus Experiment",

abstract = "Improved core high-harmonic fast wave (HHFW) heating at longer wavelengths and during start-up and plasma current ramp-up has now been obtained by lowering the edge density with lithium wall conditioning, thereby moving the critical density for perpendicular fast-wave propagation away from the vessel wall. Lithium conditioning allowed significant HHFW core electron heating of deuterium neutral beam injection (NBI) fuelled H-mode plasmas to be observed for the first time. Large edge localized modes were observed immediately after the termination of rf power. Visible and infrared camera images show that fast wave interactions can deposit considerable rf energy on the outboard divertor. HHFW-generated parametric decay instabilities were observed to heat ions in the plasma edge and may be the cause for a measured drag on edge toroidal rotation during HHFW heating. A significant enhancement in neutron rate and fast-ion profile was measured in NBI-fuelled plasmas when HHFW heating was applied.",

author = "G. Taylor and Bell, \{R. E.\} and Hosea, \{J. C.\} and Leblanc, \{B. P.\} and Phillips, \{C. K.\} and M. Podesta and Valeo, \{E. J.\} and Wilson, \{J. R.\} and Ahn, \{J. W.\} and G. Chen and Green, \{D. L.\} and Jaeger, \{E. F.\} and R. Maingi and Ryan, \{P. M.\} and Wilgen, \{J. B.\} and Heidbrink, \{W. W.\} and D. Liu and Bonoli, \{P. T.\} and T. Brecht and M. Choi and Harvey, \{R. W.\}",

year = "2010",

month = may,

doi = "10.1063/1.3371956",

language = "English (US)",

volume = "17",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "5",

}

Taylor, G, Bell, RE, Hosea, JC, Leblanc, BP, Phillips, CK, Podesta, M, Valeo, EJ, Wilson, JR, Ahn, JW, Chen, G, Green, DL, Jaeger, EF, Maingi, R, Ryan, PM, Wilgen, JB, Heidbrink, WW, Liu, D, Bonoli, PT, Brecht, T, Choi, M & Harvey, RW 2010, 'Advances in high-harmonic fast wave physics in the National Spherical Torus Experiment', Physics of Plasmas, vol. 17, no. 5, 056114. https://doi.org/10.1063/1.3371956

TY - JOUR

T1 - Advances in high-harmonic fast wave physics in the National Spherical Torus Experiment

AU - Taylor, G.

AU - Bell, R. E.

AU - Hosea, J. C.

AU - Leblanc, B. P.

AU - Phillips, C. K.

AU - Podesta, M.

AU - Valeo, E. J.

AU - Wilson, J. R.

AU - Ahn, J. W.

AU - Chen, G.

AU - Green, D. L.

AU - Jaeger, E. F.

AU - Maingi, R.

AU - Ryan, P. M.

AU - Wilgen, J. B.

AU - Heidbrink, W. W.

AU - Liu, D.

AU - Bonoli, P. T.

AU - Brecht, T.

AU - Choi, M.

AU - Harvey, R. W.

PY - 2010/5

Y1 - 2010/5

N2 - Improved core high-harmonic fast wave (HHFW) heating at longer wavelengths and during start-up and plasma current ramp-up has now been obtained by lowering the edge density with lithium wall conditioning, thereby moving the critical density for perpendicular fast-wave propagation away from the vessel wall. Lithium conditioning allowed significant HHFW core electron heating of deuterium neutral beam injection (NBI) fuelled H-mode plasmas to be observed for the first time. Large edge localized modes were observed immediately after the termination of rf power. Visible and infrared camera images show that fast wave interactions can deposit considerable rf energy on the outboard divertor. HHFW-generated parametric decay instabilities were observed to heat ions in the plasma edge and may be the cause for a measured drag on edge toroidal rotation during HHFW heating. A significant enhancement in neutron rate and fast-ion profile was measured in NBI-fuelled plasmas when HHFW heating was applied.

AB - Improved core high-harmonic fast wave (HHFW) heating at longer wavelengths and during start-up and plasma current ramp-up has now been obtained by lowering the edge density with lithium wall conditioning, thereby moving the critical density for perpendicular fast-wave propagation away from the vessel wall. Lithium conditioning allowed significant HHFW core electron heating of deuterium neutral beam injection (NBI) fuelled H-mode plasmas to be observed for the first time. Large edge localized modes were observed immediately after the termination of rf power. Visible and infrared camera images show that fast wave interactions can deposit considerable rf energy on the outboard divertor. HHFW-generated parametric decay instabilities were observed to heat ions in the plasma edge and may be the cause for a measured drag on edge toroidal rotation during HHFW heating. A significant enhancement in neutron rate and fast-ion profile was measured in NBI-fuelled plasmas when HHFW heating was applied.

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JO - Physics of Plasmas

JF - Physics of Plasmas

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ER -

Advances in high-harmonic fast wave physics in the National Spherical Torus Experiment

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