### Abstract

A set of constants of motions is chosen which is found suitable for numerical solving of the three-dimensional neoclassical kinetic equation for low collisionality plasmas in tokamaks. With the chosen set, the constants of motion space is well filled with a unique correspondence to the orbits allowed in the configuration. The numerical treatment of the boundary between the trapped and counter-passing particles becomes more straightforward, because the boundary becomes a function of only one constants of motion coordinate.

Original language | English |
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Pages (from-to) | 149 - 154 |

Number of pages | 6 |

Journal | Computer Physics Communications |

Volume | 107 |

Issue number | 1-3 |

DOIs | |

Publication status | Published - 1997 |

MoE publication type | A1 Journal article-refereed |

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### Cite this

*Computer Physics Communications*,

*107*(1-3), 149 - 154. https://doi.org/10.1016/S0010-4655(97)00106-9

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*Computer Physics Communications*, vol. 107, no. 1-3, pp. 149 - 154. https://doi.org/10.1016/S0010-4655(97)00106-9

**Choice of constants of motion coordinates in numerical solving of the three-dimensional Fokker-Planck equation for tokamaks.** / Kiviniemi, Timo; Heikkinen, Jukka.

Research output: Contribution to journal › Article › Scientific › peer-review

TY - JOUR

T1 - Choice of constants of motion coordinates in numerical solving of the three-dimensional Fokker-Planck equation for tokamaks

AU - Kiviniemi, Timo

AU - Heikkinen, Jukka

N1 - Project code: ENE9606

PY - 1997

Y1 - 1997

N2 - A set of constants of motions is chosen which is found suitable for numerical solving of the three-dimensional neoclassical kinetic equation for low collisionality plasmas in tokamaks. With the chosen set, the constants of motion space is well filled with a unique correspondence to the orbits allowed in the configuration. The numerical treatment of the boundary between the trapped and counter-passing particles becomes more straightforward, because the boundary becomes a function of only one constants of motion coordinate.

AB - A set of constants of motions is chosen which is found suitable for numerical solving of the three-dimensional neoclassical kinetic equation for low collisionality plasmas in tokamaks. With the chosen set, the constants of motion space is well filled with a unique correspondence to the orbits allowed in the configuration. The numerical treatment of the boundary between the trapped and counter-passing particles becomes more straightforward, because the boundary becomes a function of only one constants of motion coordinate.

U2 - 10.1016/S0010-4655(97)00106-9

DO - 10.1016/S0010-4655(97)00106-9

M3 - Article

VL - 107

SP - 149

EP - 154

JO - Computer Physics Communications

JF - Computer Physics Communications

SN - 0010-4655

IS - 1-3

ER -