## Abstract

An eikonal ballooning mode formalism is developed to describe curvature-driven modes of hot electron plasmas in bumpy tori. The formalism treats frequencies comparable to the ion cyclotron frequency, as well as arbitrary finite Larmor radius and field polarization, although the detailed analysis is restricted to E_{∥}=0. Moderate hot electron finite Larmor radius effects are found to lower the background beta core limit, whereas strong finite Larmor radius effects produce stabilization. The critical finite Larmor radius parameter with weak curvature is FR=k_{⊥} ^{2}p_{h}^{2}R/ Δ_{b} (1 + P _{∥}′/P_{⊥}′) where k⊥ is the perpendicular wavenumber, p_{h} the hot electron Larmor radius, R the magnetic field radius of curvature at the hot-electron layer, Δ_{b} the magnetic field scale length in the diamagnetic well, and P_{∥}′,_{⊥} are the parallel and perpendicular pressure gradients. The interchange instability arises if 1 > FR > 1 - β_{c}R/[2Δ (1+P_{∥}′/P _{⊥}′], whereas all modes are stable if FR > 1, where β_{c} is the core plasma beta and Δ is the core plasma pressure gradient length.

Original language | English |
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Pages (from-to) | 2642-2651 |

Number of pages | 10 |

Journal | Physics of Fluids |

Volume | 26 |

Issue number | 9 |

DOIs | |

Publication status | Published - 1983 Jan 1 |

## All Science Journal Classification (ASJC) codes

- Computational Mechanics
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Fluid Flow and Transfer Processes