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PreprintCC BY-NC-SA 4.0arXiv

A reduced model for neoclassical transport in non-axisymmetric magnetic configurations

  • Y. Ban
  • X. Garbet
  • R. Varennes
  • Z. Qu
  • K. Lim
  • Y. Sarazin
  • A. Ibrahim
  • Y. C. Tay
  • B. B. Ang
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Abstract

A unified framework is proposed to compute a neoclassical equilibrium for tokamaks with non-axisymmetric magnetic perturbations, based on a Hamiltonian description combined with a variational approach that relies on a principle of minimum entropy production. This approach allows for a transparent identification of the respective contributions from different classes of trapped particles in magnetic well minima. Analytic expressions are derived for specific collisionality regimes, and a fast and efficient numerical procedure is devised to compute the entropy production rate. Finding the extremum of the entropy production leads to tractable expressions of transport coefficients that can be computed quickly and efficiently.

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Cite

BibTeXRIS
BibTeX
@misc{ban2026reduced,
  title = {{A reduced model for neoclassical transport in non-axisymmetric magnetic configurations}},
  author = {Y. Ban and X. Garbet and R. Varennes and Z. Qu and K. Lim and Y. Sarazin and A. Ibrahim and Y. C. Tay and B. B. Ang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.15561},
  eprint = {2610.15561},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.15561},
  note = {CC BY-NC-SA 4.0},
}
RIS
TY  - UNPB
TI  - A reduced model for neoclassical transport in non-axisymmetric magnetic configurations
AU  - Y. Ban
AU  - X. Garbet
AU  - R. Varennes
AU  - Z. Qu
AU  - K. Lim
AU  - Y. Sarazin
AU  - A. Ibrahim
AU  - Y. C. Tay
AU  - B. B. Ang
PY  - 2026
DA  - 2026/10/11
PB  - arXiv
DO  - 10.48550/arxiv.2610.15561
UR  - https://arxiv.org/abs/2610.15561
AB  - A unified framework is proposed to compute a neoclassical equilibrium for tokamaks with non-axisymmetric magnetic perturbations, based on a Hamiltonian description combined with a variational approach that relies on a principle of minimum entropy production. This approach allows for a transparent identification of the respective contributions from different classes of trapped particles in magnetic well minima. Analytic expressions are derived for specific collisionality regimes, and a fast and efficient numerical procedure is devised to compute the entropy production rate. Finding the extremum of the entropy production leads to tractable expressions of transport coefficients that can be computed quickly and efficiently.
ER  -