Alpha-particle effects on low-n magnetohydrodynamic modes

C. Z. Cheng

doi:10.13182/FST90-A29280

Alpha-particle effects on low-n magnetohydrodynamic modes

C. Z. Cheng

Institute of Space and Plasma Sciences

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

13 Citations (Scopus)

Abstract

The NOVA-K code is employed to study the effects of alpha particles on two types of magnetohydrodynamic (MHD) modes: (a) the stabilization of ideal MHD internal modes and the excitation of resonant internal modes, and (b) the alpha-particle destabilization of toroidicity-induced Alfven eigenmodes (TAEs) via transit resonances. Analytical theories are also presented to help explain the NOVA-K results. The trapped alpha particles are found to destabilize the n = 1 internal mode and lower the total beta threshold. The circulating alpha particles can strongly destabilize TAE modes via inverse Landau damping associated with the spatial gradient of the alpha-particle pressure.

Original language	English
Pages (from-to)	443-454
Number of pages	12
Journal	Fusion Technology
Volume	18
Issue number	3
DOIs	https://doi.org/10.13182/FST90-A29280
Publication status	Published - 1990

All Science Journal Classification (ASJC) codes

General Engineering

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10.13182/FST90-A29280

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abstract = "The NOVA-K code is employed to study the effects of alpha particles on two types of magnetohydrodynamic (MHD) modes: (a) the stabilization of ideal MHD internal modes and the excitation of resonant internal modes, and (b) the alpha-particle destabilization of toroidicity-induced Alfven eigenmodes (TAEs) via transit resonances. Analytical theories are also presented to help explain the NOVA-K results. The trapped alpha particles are found to destabilize the n = 1 internal mode and lower the total beta threshold. The circulating alpha particles can strongly destabilize TAE modes via inverse Landau damping associated with the spatial gradient of the alpha-particle pressure.",

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language = "English",

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journal = "Fusion Technology",

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T1 - Alpha-particle effects on low-n magnetohydrodynamic modes

AU - Cheng, C. Z.

PY - 1990

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N2 - The NOVA-K code is employed to study the effects of alpha particles on two types of magnetohydrodynamic (MHD) modes: (a) the stabilization of ideal MHD internal modes and the excitation of resonant internal modes, and (b) the alpha-particle destabilization of toroidicity-induced Alfven eigenmodes (TAEs) via transit resonances. Analytical theories are also presented to help explain the NOVA-K results. The trapped alpha particles are found to destabilize the n = 1 internal mode and lower the total beta threshold. The circulating alpha particles can strongly destabilize TAE modes via inverse Landau damping associated with the spatial gradient of the alpha-particle pressure.

AB - The NOVA-K code is employed to study the effects of alpha particles on two types of magnetohydrodynamic (MHD) modes: (a) the stabilization of ideal MHD internal modes and the excitation of resonant internal modes, and (b) the alpha-particle destabilization of toroidicity-induced Alfven eigenmodes (TAEs) via transit resonances. Analytical theories are also presented to help explain the NOVA-K results. The trapped alpha particles are found to destabilize the n = 1 internal mode and lower the total beta threshold. The circulating alpha particles can strongly destabilize TAE modes via inverse Landau damping associated with the spatial gradient of the alpha-particle pressure.

UR - https://www.scopus.com/pages/publications/0025516691

UR - https://www.scopus.com/pages/publications/0025516691#tab=citedBy

U2 - 10.13182/FST90-A29280

DO - 10.13182/FST90-A29280

M3 - Article

AN - SCOPUS:0025516691

SN - 0748-1896

VL - 18

SP - 443

EP - 454

JO - Fusion Technology

JF - Fusion Technology

IS - 3

ER -

Alpha-particle effects on low-n magnetohydrodynamic modes

Abstract

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