Theory of energetic trapped particle‐induced resistive interchange‐ballooning modes
作者:
Hamid Biglari,
Liu Chen,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1986)
卷期:
Volume 29,
issue 9
页码: 2960-2974
ISSN:0031-9171
年代: 1986
DOI:10.1063/1.865496
出版商: AIP
数据来源: AIP
摘要:
A theory describing the influence of energetic trapped particles on resistive‐interchange‐ballooning modes in tokamaks is presented. It is shown that a population of hot particles trapped in the region of adverse curvature can resonantly interact with and destabilize the resistive interchange mode, which is stable in their absence because of favorable average curvature. The mode is different from the usual resistive interchange mode not only in its destablization mechanism, but also in that it has a real component to its frequency comparable to the precessional drift frequency of the rapidly circulating energetic species. Corresponding growth rate and threshold conditions for this trapped‐particle‐driven instability are derived and finite banana width effects are shown to have a stabilizing effect on the mode. Finally, the ballooning/tearing dispersion relation is generalized to include hot particles, so that both the ideal and the resistive modes are derivable in the appropriate limits.
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