An Alfvén eigenmode similarity experiment

W. W. Heidbrink; E. Fredrickson; N. N. Gorelenkov; A. W. Hyatt; G. Kramer; Y. Luo

doi:10.1088/0741-3335/45/6/311

An Alfvén eigenmode similarity experiment

W. W. Heidbrink
, E. Fredrickson
, N. N. Gorelenkov
, A. W. Hyatt
, G. Kramer
, Y. Luo

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

The major radius dependence of Alfvén mode stability is studied by creating plasmas with similar minor radius, shape, magnetic field (0.5 T), density (n_e ≃ 3 × 10¹⁹ m^-3), electron temperature (1.0 keV) and beam ion population (near-tangential 80 keV deuterium injection) on both NSTX and DIII-D. The major radius of NSTX is half the major radius of DIII-D. The super-Alfvénic beam ions that drive the modes have overlapping values of v_f/v_A in the two devices. Observed beam-driven instabilities include toroidicity-induced Alfvén eigenmodes (TAE). The stability threshold for the TAE is similar in the two devices. As expected theoretically, the most unstable toroidal mode number n is larger in DIII-D.

Original language	English (US)
Pages (from-to)	983-997
Number of pages	15
Journal	Plasma Physics and Controlled Fusion
Volume	45
Issue number	6
DOIs	https://doi.org/10.1088/0741-3335/45/6/311
State	Published - Jun 2003

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/45/6/311

Cite this

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title = "An Alfv{\'e}n eigenmode similarity experiment",

abstract = "The major radius dependence of Alfv{\'e}n mode stability is studied by creating plasmas with similar minor radius, shape, magnetic field (0.5 T), density (ne ≃ 3 × 1019 m-3), electron temperature (1.0 keV) and beam ion population (near-tangential 80 keV deuterium injection) on both NSTX and DIII-D. The major radius of NSTX is half the major radius of DIII-D. The super-Alfv{\'e}nic beam ions that drive the modes have overlapping values of vf/vA in the two devices. Observed beam-driven instabilities include toroidicity-induced Alfv{\'e}n eigenmodes (TAE). The stability threshold for the TAE is similar in the two devices. As expected theoretically, the most unstable toroidal mode number n is larger in DIII-D.",

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AU - Heidbrink, W. W.

AU - Fredrickson, E.

AU - Gorelenkov, N. N.

AU - Hyatt, A. W.

AU - Kramer, G.

AU - Luo, Y.

PY - 2003/6

Y1 - 2003/6

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AB - The major radius dependence of Alfvén mode stability is studied by creating plasmas with similar minor radius, shape, magnetic field (0.5 T), density (ne ≃ 3 × 1019 m-3), electron temperature (1.0 keV) and beam ion population (near-tangential 80 keV deuterium injection) on both NSTX and DIII-D. The major radius of NSTX is half the major radius of DIII-D. The super-Alfvénic beam ions that drive the modes have overlapping values of vf/vA in the two devices. Observed beam-driven instabilities include toroidicity-induced Alfvén eigenmodes (TAE). The stability threshold for the TAE is similar in the two devices. As expected theoretically, the most unstable toroidal mode number n is larger in DIII-D.

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DO - 10.1088/0741-3335/45/6/311

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VL - 45

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EP - 997

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 6

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An Alfvén eigenmode similarity experiment

Abstract

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