β suppression of Alfvén cascade modes in the National Spherical Torus Experiment

E. D. Fredrickson; N. A. Crocker; N. N. Gorelenkov; W. W. Heidbrink; S. Kubota; F. M. Levinton; H. Yuh; J. E. Menard; R. E. Bell

doi:10.1063/1.2768038

β suppression of Alfvén cascade modes in the National Spherical Torus Experiment

E. D. Fredrickson, N. A. Crocker, N. N. Gorelenkov, W. W. Heidbrink, S. Kubota, F. M. Levinton, H. Yuh, J. E. Menard, R. E. Bell

PPPL Theory

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Abstract

Alfvén cascade modes have been found in low density, low β plasmas on the National Spherical Torus Experiment [M. Ono et al., Nucl. Fusion 40, 557 (2000)]. An extension of the theory of cascade modes which includes the coupling to geodesic acoustic modes [Breizman et al., Phys. Plasmas 12, 112506 (2005)] is shown to imply their absence for typical spherical tokamak ratios of electron thermal to magnetic energy, β. A scan in electron β confirmed a threshold for suppression of cascade modes in good agreement with theoretical predictions.

Original language	English (US)
Article number	102510
Journal	Physics of Plasmas
Volume	14
Issue number	10
DOIs	https://doi.org/10.1063/1.2768038
State	Published - 2007

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.2768038

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title = "β suppression of Alfv{\'e}n cascade modes in the National Spherical Torus Experiment",

abstract = "Alfv{\'e}n cascade modes have been found in low density, low β plasmas on the National Spherical Torus Experiment [M. Ono et al., Nucl. Fusion 40, 557 (2000)]. An extension of the theory of cascade modes which includes the coupling to geodesic acoustic modes [Breizman et al., Phys. Plasmas 12, 112506 (2005)] is shown to imply their absence for typical spherical tokamak ratios of electron thermal to magnetic energy, β. A scan in electron β confirmed a threshold for suppression of cascade modes in good agreement with theoretical predictions.",

author = "Fredrickson, \{E. D.\} and Crocker, \{N. A.\} and Gorelenkov, \{N. N.\} and Heidbrink, \{W. W.\} and S. Kubota and Levinton, \{F. M.\} and H. Yuh and Menard, \{J. E.\} and Bell, \{R. E.\}",

year = "2007",

doi = "10.1063/1.2768038",

language = "English (US)",

volume = "14",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - β suppression of Alfvén cascade modes in the National Spherical Torus Experiment

AU - Fredrickson, E. D.

AU - Crocker, N. A.

AU - Gorelenkov, N. N.

AU - Heidbrink, W. W.

AU - Kubota, S.

AU - Levinton, F. M.

AU - Yuh, H.

AU - Menard, J. E.

AU - Bell, R. E.

PY - 2007

Y1 - 2007

N2 - Alfvén cascade modes have been found in low density, low β plasmas on the National Spherical Torus Experiment [M. Ono et al., Nucl. Fusion 40, 557 (2000)]. An extension of the theory of cascade modes which includes the coupling to geodesic acoustic modes [Breizman et al., Phys. Plasmas 12, 112506 (2005)] is shown to imply their absence for typical spherical tokamak ratios of electron thermal to magnetic energy, β. A scan in electron β confirmed a threshold for suppression of cascade modes in good agreement with theoretical predictions.

AB - Alfvén cascade modes have been found in low density, low β plasmas on the National Spherical Torus Experiment [M. Ono et al., Nucl. Fusion 40, 557 (2000)]. An extension of the theory of cascade modes which includes the coupling to geodesic acoustic modes [Breizman et al., Phys. Plasmas 12, 112506 (2005)] is shown to imply their absence for typical spherical tokamak ratios of electron thermal to magnetic energy, β. A scan in electron β confirmed a threshold for suppression of cascade modes in good agreement with theoretical predictions.

UR - https://www.scopus.com/pages/publications/36049041057

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U2 - 10.1063/1.2768038

DO - 10.1063/1.2768038

M3 - Article

AN - SCOPUS:36049041057

SN - 1070-664X

VL - 14

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 10

M1 - 102510

ER -

β suppression of Alfvén cascade modes in the National Spherical Torus Experiment

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