### Abstract

It is shown that ion thermal conductivity close to the magnetic axis in tokamaks is reduced by a factor of |S|^{5/3} if (M_{i}/M_{e})^{2/3}(T_{e}/T_{i}) ^{4/3}/|S|^{5/3}≫ 1. Here, S is the orbit squeezing factor, M_{i}(M_{e}) is the ion (electron) mass, and T_{i}(T_{e}) is the ion (electron) temperature. The reduction reflects both the increase of the fraction of trapped particles by a factor of \S\^{1/3}, and the decrease of the orbit size in units of the poloidal flux ψ by a factor of |S|^{2/3}.

Original language | English |
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Pages (from-to) | 1371-1374 |

Number of pages | 4 |

Journal | Physics of Plasmas |

Volume | 4 |

Issue number | 5 |

DOIs | |

Publication status | Published - 1997 May |

### All Science Journal Classification (ASJC) codes

- Condensed Matter Physics

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## Cite this

Shaing, K. C., Hazeltine, R. D., & Zarnstorff, M. C. (1997). Effects of orbit squeezing on ion transport processes close to magnetic axis.

*Physics of Plasmas*,*4*(5), 1371-1374. https://doi.org/10.1063/1.872312