### Abstract

A new resistive, low-frequency (ω≪ω_{ba}∼ν _{a}, where ω is the frequency of the mode and ω_{ba} and ν_{a} are the bounce frequency and collision frequency for species a) instability is found in a tokamak geometry. The mode is driven unstable by the parallel viscous (bootstrap) current induced by the radial pressure gradient. It has a growth rate γ∼(ω _{*e}^{2}ν_{i})^{1/3} for ν_{i}≫ω_{*e}, where ω_{*e} is the electron diamagnetic drift frequency and ν_{i} is the ion-ion collision frequency. The frequency dependence of the parallel viscosity is also derived and utilized to show that drift wave branches of these modes are stable, but that this new mode remains unstable when the diamagnetic drift effects are included.

Original language | English |
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Pages (from-to) | 1859-1865 |

Number of pages | 7 |

Journal | Physics of Fluids |

Volume | 28 |

Issue number | 6 |

DOIs | |

Publication status | Published - 1985 Jan 1 |

### All Science Journal Classification (ASJC) codes

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

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## Cite this

*Physics of Fluids*,

*28*(6), 1859-1865. https://doi.org/10.1063/1.864929