High-n collisionless ballooning modes in axisymmetric toroidal plasmas

C. Z. Cheng

研究成果: Article同行評審

33 引文 斯高帕斯(Scopus)

摘要

A collisionless kinetic ballooning-mode equation which includes the full ion finite-Larmorradius (FLR) the magnetic-drift and the trapped-electron effects is derived and investigated for a largeaspect- ratio circular-flux-surface equilibrium in the frequency regime ωbiωti< ω < ωbeωteThe finite-Larmor-radius effects can reduce the growth rate but do not stabilize the ballooning modes due to the destabilizing influence of the ion-magnetic-drift resonances. It is in general incorrect to simulate the FLR effects by employing the often used FLR-modified MHD model for (kθρi)2≳ 0.1 and ϵn≳ 0.1 where kθρiis the ion FLR parameter and ϵn= Ln/R measures the magnetic-drift frequency. The trapped electrons have a stabilizing effect due to the reduction of the destabilizing circulating-electron parallel-current perturbation. For a typical tokamak aspect ratio the critical β can be improved by 40%.

原文English
頁(從 - 到)773-785
頁數13
期刊Nuclear Fusion
22
發行號6
DOIs
出版狀態Published - 1982 6月

All Science Journal Classification (ASJC) codes

  • 核能與高能物理
  • 凝聚態物理學

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