Non-resonant destabilization of (1/1) internal kink mode by suprathermal electron pressure

L. Delgado-Aparicio; L. Sugiyama; S. Shiraiwa; J. Irby; R. Granetz; R. Parker; S. G. Baek; I. Faust; G. Wallace; D. A. Gates; N. Gorelenkov; R. Mumgaard; S. Scott; N. Bertelli; C. Gao; M. Greenwald; A. Hubbard; J. Hughes; E. Marmar; P. E. Phillips; J. E. Rice; W. L. Rowan; R. Wilson; S. Wolfe; S. Wukitch

doi:10.1063/1.4919964

Non-resonant destabilization of (1/1) internal kink mode by suprathermal electron pressure

L. Delgado-Aparicio, L. Sugiyama, S. Shiraiwa, J. Irby, R. Granetz, R. Parker, S. G. Baek, I. Faust, G. Wallace, D. A. Gates, N. Gorelenkov, R. Mumgaard, S. Scott, N. Bertelli, C. Gao, M. Greenwald, A. Hubbard, J. Hughes, E. Marmar, P. E. PhillipsJ. E. Rice, W. L. Rowan, R. Wilson, S. Wolfe, S. Wukitch

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11 Scopus citations

Abstract

New experimental observations are reported on the structure and dynamics of short-lived periodic (1, 1) "fishbone"-like oscillations that appear during radio frequency heating and current-drive experiments in tokamak plasmas. For the first time, measurements can directly relate changes in the high energy electrons to the mode onset, saturation, and damping. In the relatively high collisionality of Alcator C-Mod with lower hybrid current drive, the instability appears to be destabilized by the non-resonant suprathermal electron pressure - rather than by wave-particle resonance, rotates toroidally with the plasma and grows independently of the (1, 1) sawtooth crash driven by the thermal plasma pressure.

Original language	English (US)
Article number	050701
Journal	Physics of Plasmas
Volume	22
Issue number	5
DOIs	https://doi.org/10.1063/1.4919964
State	Published - May 1 2015

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.4919964

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Delgado-Aparicio, L., Sugiyama, L., Shiraiwa, S., Irby, J., Granetz, R., Parker, R., Baek, S. G., Faust, I., Wallace, G., Gates, D. A., Gorelenkov, N., Mumgaard, R., Scott, S., Bertelli, N., Gao, C., Greenwald, M., Hubbard, A., Hughes, J., Marmar, E., ... Wukitch, S. (2015). Non-resonant destabilization of (1/1) internal kink mode by suprathermal electron pressure. Physics of Plasmas, 22(5), Article 050701. https://doi.org/10.1063/1.4919964

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title = "Non-resonant destabilization of (1/1) internal kink mode by suprathermal electron pressure",

abstract = "New experimental observations are reported on the structure and dynamics of short-lived periodic (1, 1) {"}fishbone{"}-like oscillations that appear during radio frequency heating and current-drive experiments in tokamak plasmas. For the first time, measurements can directly relate changes in the high energy electrons to the mode onset, saturation, and damping. In the relatively high collisionality of Alcator C-Mod with lower hybrid current drive, the instability appears to be destabilized by the non-resonant suprathermal electron pressure - rather than by wave-particle resonance, rotates toroidally with the plasma and grows independently of the (1, 1) sawtooth crash driven by the thermal plasma pressure.",

author = "L. Delgado-Aparicio and L. Sugiyama and S. Shiraiwa and J. Irby and R. Granetz and R. Parker and Baek, \{S. G.\} and I. Faust and G. Wallace and Gates, \{D. A.\} and N. Gorelenkov and R. Mumgaard and S. Scott and N. Bertelli and C. Gao and M. Greenwald and A. Hubbard and J. Hughes and E. Marmar and Phillips, \{P. E.\} and Rice, \{J. E.\} and Rowan, \{W. L.\} and R. Wilson and S. Wolfe and S. Wukitch",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",

year = "2015",

month = may,

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doi = "10.1063/1.4919964",

language = "English (US)",

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Delgado-Aparicio, L, Sugiyama, L, Shiraiwa, S, Irby, J, Granetz, R, Parker, R, Baek, SG, Faust, I, Wallace, G, Gates, DA , Gorelenkov, N, Mumgaard, R, Scott, S, Bertelli, N, Gao, C, Greenwald, M, Hubbard, A, Hughes, J, Marmar, E, Phillips, PE, Rice, JE, Rowan, WL, Wilson, R, Wolfe, S & Wukitch, S 2015, 'Non-resonant destabilization of (1/1) internal kink mode by suprathermal electron pressure', Physics of Plasmas, vol. 22, no. 5, 050701. https://doi.org/10.1063/1.4919964

TY - JOUR

T1 - Non-resonant destabilization of (1/1) internal kink mode by suprathermal electron pressure

AU - Delgado-Aparicio, L.

AU - Sugiyama, L.

AU - Shiraiwa, S.

AU - Irby, J.

AU - Granetz, R.

AU - Parker, R.

AU - Baek, S. G.

AU - Faust, I.

AU - Wallace, G.

AU - Gates, D. A.

AU - Gorelenkov, N.

AU - Mumgaard, R.

AU - Scott, S.

AU - Bertelli, N.

AU - Gao, C.

AU - Greenwald, M.

AU - Hubbard, A.

AU - Hughes, J.

AU - Marmar, E.

AU - Phillips, P. E.

AU - Rice, J. E.

AU - Rowan, W. L.

AU - Wilson, R.

AU - Wolfe, S.

AU - Wukitch, S.

PY - 2015/5/1

Y1 - 2015/5/1

N2 - New experimental observations are reported on the structure and dynamics of short-lived periodic (1, 1) "fishbone"-like oscillations that appear during radio frequency heating and current-drive experiments in tokamak plasmas. For the first time, measurements can directly relate changes in the high energy electrons to the mode onset, saturation, and damping. In the relatively high collisionality of Alcator C-Mod with lower hybrid current drive, the instability appears to be destabilized by the non-resonant suprathermal electron pressure - rather than by wave-particle resonance, rotates toroidally with the plasma and grows independently of the (1, 1) sawtooth crash driven by the thermal plasma pressure.

AB - New experimental observations are reported on the structure and dynamics of short-lived periodic (1, 1) "fishbone"-like oscillations that appear during radio frequency heating and current-drive experiments in tokamak plasmas. For the first time, measurements can directly relate changes in the high energy electrons to the mode onset, saturation, and damping. In the relatively high collisionality of Alcator C-Mod with lower hybrid current drive, the instability appears to be destabilized by the non-resonant suprathermal electron pressure - rather than by wave-particle resonance, rotates toroidally with the plasma and grows independently of the (1, 1) sawtooth crash driven by the thermal plasma pressure.

UR - https://www.scopus.com/pages/publications/84929105253

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SN - 1070-664X

VL - 22

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

M1 - 050701

ER -

Non-resonant destabilization of (1/1) internal kink mode by suprathermal electron pressure

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