Energetic-electron-driven instability in the helically symmetric experiment

C. B. Deng; D. L. Brower; B. N. Breizman; D. A. Spong; A. F. Almagri; D. T. Anderson; F. S.B. Anderson; W. X. Ding; W. Guttenfelder; K. M. Likin; J. N. Talmadge

doi:10.1103/PhysRevLett.103.025003

Energetic-electron-driven instability in the helically symmetric experiment

C. B. Deng, D. L. Brower, B. N. Breizman, D. A. Spong, A. F. Almagri, D. T. Anderson, F. S.B. Anderson, W. X. Ding, W. Guttenfelder, K. M. Likin, J. N. Talmadge

Plasma Theory and Modeling

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31 Scopus citations

Abstract

Energetic electrons generated by electron cyclotron resonance heating are observed to drive instabilities in the quasihelically symmetric stellarator device. The coherent, global fluctuations peak in the plasma core and are measured in the frequency range of 20-120 kHz. Mode propagation is in the diamagnetic drift direction of the driving species. When quasihelical symmetry is broken, the mode is no longer observed. Experimental observations indicate that the unstable mode is acoustic rather than Alfvénic.

Original language	English
Article number	025003
Journal	Physical Review Letters
Volume	103
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.103.025003
State	Published - Aug 6 2009

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10.1103/PhysRevLett.103.025003

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title = "Energetic-electron-driven instability in the helically symmetric experiment",

abstract = "Energetic electrons generated by electron cyclotron resonance heating are observed to drive instabilities in the quasihelically symmetric stellarator device. The coherent, global fluctuations peak in the plasma core and are measured in the frequency range of 20-120 kHz. Mode propagation is in the diamagnetic drift direction of the driving species. When quasihelical symmetry is broken, the mode is no longer observed. Experimental observations indicate that the unstable mode is acoustic rather than Alfv{\'e}nic.",

author = "Deng, {C. B.} and Brower, {D. L.} and Breizman, {B. N.} and Spong, {D. A.} and Almagri, {A. F.} and Anderson, {D. T.} and Anderson, {F. S.B.} and Ding, {W. X.} and W. Guttenfelder and Likin, {K. M.} and Talmadge, {J. N.}",

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doi = "10.1103/PhysRevLett.103.025003",

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T1 - Energetic-electron-driven instability in the helically symmetric experiment

AU - Deng, C. B.

AU - Brower, D. L.

AU - Breizman, B. N.

AU - Spong, D. A.

AU - Almagri, A. F.

AU - Anderson, D. T.

AU - Anderson, F. S.B.

AU - Ding, W. X.

AU - Guttenfelder, W.

AU - Likin, K. M.

AU - Talmadge, J. N.

PY - 2009/8/6

Y1 - 2009/8/6

N2 - Energetic electrons generated by electron cyclotron resonance heating are observed to drive instabilities in the quasihelically symmetric stellarator device. The coherent, global fluctuations peak in the plasma core and are measured in the frequency range of 20-120 kHz. Mode propagation is in the diamagnetic drift direction of the driving species. When quasihelical symmetry is broken, the mode is no longer observed. Experimental observations indicate that the unstable mode is acoustic rather than Alfvénic.

AB - Energetic electrons generated by electron cyclotron resonance heating are observed to drive instabilities in the quasihelically symmetric stellarator device. The coherent, global fluctuations peak in the plasma core and are measured in the frequency range of 20-120 kHz. Mode propagation is in the diamagnetic drift direction of the driving species. When quasihelical symmetry is broken, the mode is no longer observed. Experimental observations indicate that the unstable mode is acoustic rather than Alfvénic.

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DO - 10.1103/PhysRevLett.103.025003

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VL - 103

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

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ER -

Energetic-electron-driven instability in the helically symmetric experiment

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