Alpha-particle effects on low-n magnetohydrodynamic modes

C. Z. Cheng

Research output: Contribution to journalArticle

13 Citations (Scopus)


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 languageEnglish
Pages (from-to)443-454
Number of pages12
JournalFusion Technology
Issue number3
Publication statusPublished - 1990 Jan 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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