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PreprintCC BY 4.0arXiv

Theory for the power threshold of the L-H transition in tokamaks

  • Brenno De Lucca
  • Paolo Ricci
  • Benoit Labit
  • Davide Mancini
  • Louis Stenger
  • Zeno Tecchiolli
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Abstract

Flux-driven two-fluid simulations in a diverted tokamak exhibit a confinement transition when a critical heating threshold is exceeded, as in experimental observations of the L-H transition. The simulations show that electromagnetic drift-wave turbulence spontaneously generates a sheared E× B flow responsible for transport suppression in the edge. The toroidal-field asymmetry of the transition, here reproduced in simulations for the first time, arises from time-reversal symmetry breaking by finite collisionality, as demonstrated by a quasilinear calculation of the turbulent momentum flux. Scaling laws are analytically derived for the L-H power threshold in the high- and low-density branches, for the density minimum, and for the minimum power, all matching or surpassing the accuracy of existing empirical scalings.

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Cite

BibTeXRIS
BibTeX
@misc{lucca2026theory,
  title = {{Theory for the power threshold of the L-H transition in tokamaks}},
  author = {Brenno De Lucca and Paolo Ricci and Benoit Labit and Davide Mancini and Louis Stenger and Zeno Tecchiolli},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2605.00624},
  eprint = {2605.00624},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.00624},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Theory for the power threshold of the L-H transition in tokamaks
AU  - Brenno De Lucca
AU  - Paolo Ricci
AU  - Benoit Labit
AU  - Davide Mancini
AU  - Louis Stenger
AU  - Zeno Tecchiolli
PY  - 2026
DA  - 2026/10/26
PB  - arXiv
DO  - 10.48550/arxiv.2605.00624
UR  - https://arxiv.org/abs/2605.00624
AB  - Flux-driven two-fluid simulations in a diverted tokamak exhibit a confinement transition when a critical heating threshold is exceeded, as in experimental observations of the L-H transition. The simulations show that electromagnetic drift-wave turbulence spontaneously generates a sheared E× B flow responsible for transport suppression in the edge. The toroidal-field asymmetry of the transition, here reproduced in simulations for the first time, arises from time-reversal symmetry breaking by finite collisionality, as demonstrated by a quasilinear calculation of the turbulent momentum flux. Scaling laws are analytically derived for the L-H power threshold in the high- and low-density branches, for the density minimum, and for the minimum power, all matching or surpassing the accuracy of existing empirical scalings.
ER  -