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HEPP Seminar Summer 2026 #6: M. da Silva Barros / O. Varley

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HGW-SR2 / GAR-D2

HGW-SR2 / GAR-D2
Gustavo Grenfell (Max Planck Institute for Plasma Physics - Garching), René Bussiahn (IPP Bereich Greifswald)
Description

https://eu02web.zoom-x.de/j/68203618730?pwd=0ftcdSo212mi4VamayjXSCmZX0tUZJ.1

Meeting-ID: 682 0361 8730
Kenncode: 267281

 
HEPP Seminar
Participants
  • Gustavo Grenfell
  • René Bussiahn
    • 16:00 → 16:30
      M. da Silva Barros (P): Fluid Turbulence Simulations in Geometries with Internal Magnetic Islands 30m

      no abstract provided

      Speaker: Miguel Da Silva Barros Madeira (IPP Bereich Greifswald)
      Abstract.pdf
    • 16:30 → 17:00
      O. Varley (P): Finite-Beta Effects on Divertor Island Topology in Optimised QI Stellarators with JOREK 30m

      Quasi-isodynamic (QI) stellarators with island divertors are promising candidates for future fusion reactors [1]. Experiments on W7-X and MHD modelling with HINT [2] have shown that divertor performance is highly sensitive to changes in magnetic topology. Increasing plasma beta can modify the size and position of magnetic islands, while also enhancing stochasticity. Recent studies further suggest that, in certain optimised QI stellarators, increasing beta may trigger a phase transition within the magnetic islands, leading to dramatic changes in island topology [3].

      In this work, we use the fully implicit nonlinear MHD code JOREK to investigate these effects and compare the results against HINT calculations. Refined workflows are developed to improve the robustness of JOREK edge modelling. Initial studies show qualitative agreement between JOREK and HINT, although a free-boundary extension of JOREK is required to achieve quantitative agreement.

      [1] A. Goodman et al. J. Plasma Phys. 91, E153 (2025).

      [2] Y. Suzuki et al. Nucl. Fusion 46, L19 (2006).

      [3] J. Geiger et al. 24th ISHW, Poster Session 1, Poster 42 (2024).

      Speaker: Orin Varley

      Quasi-isodynamic (QI) stellarators with island divertors are promising candidates for future fusion reactors [1]. Experiments on W7-X and MHD modelling with HINT [2] have shown that divertor performance is highly sensitive to changes in magnetic topology. Increasing plasma beta can modify the size and position of magnetic islands, while also enhancing stochasticity. Recent studies further suggest that, in certain optimised QI stellarators, increasing beta may trigger a phase transition within the magnetic islands, leading to dramatic changes in island topology [3].

      In this work, we use the fully implicit nonlinear MHD code JOREK to investigate these effects and compare the results against HINT calculations. Refined workflows are developed to improve the robustness of JOREK edge modelling. Initial studies show qualitative agreement between JOREK and HINT, although a free-boundary extension of JOREK is required to achieve quantitative agreement.

      [1] A. Goodman et al. J. Plasma Phys. 91, E153 (2025).

      [2] Y. Suzuki et al. Nucl. Fusion 46, L19 (2006).

      [3] J. Geiger et al. 24th ISHW, Poster Session 1, Poster 42 (2024).