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DTSTAMP:20260605T154541Z
LOCATION:Plenary Room (Bldg. 6 - 001)
DTSTART;TZID=Europe/Stockholm:20260629T192300
DTEND;TZID=Europe/Stockholm:20260629T192400
UID:submissions.pasc-conference.org_PASC26_sess124_pos112@linklings.com
SUMMARY:P04 - Algorithms and Optimizations for Global Non-Linear Hybrid Fl
 uid-Kinetic Finite Element Stellarator Simulations
DESCRIPTION:Luca Venerando Greco and Matthias Hoelzl (Max Planck Institute
  for Plasma Physics); Guido Huijsmans (CEA, IRFM); and Edoardo Carrà (Max 
 Planck Institute for Plasma Physics)\n\nPredictive modeling of stellarator
  plasmas is crucial for advancing nuclear fusion energy, yet it faces uniq
 ue computational difficulties. A primary challenge is accurately simulatin
 g the dynamics of specific particle species not well captured by fluid mod
 els, necessitating the use of hybrid fluid-kinetic models. The non-axisymm
 etric geometry of stellarators fundamentally couples toroidal Fourier mode
 s, in contrast to tokamaks, requiring specialized numerical treatment.\n\n
 This work presents a novel, globally coupled projection scheme inside the 
 JOREK finite element framework. The approach ensures a self-consistent and
  physically accurate transfer of kinetic markers to the fluid grid, effect
 ively handling complex 3D meshes by solving a unified linear system that e
 ncompasses all toroidal harmonics simultaneously. To manage computational 
 complexity, matrix construction is significantly accelerated using the Fas
 t Fourier Transform. Efficient localization of millions of particles is en
 abled by a 3D R-Tree spatial index, ensuring computational tractability at
  scale. On realistic Wendelstein 7-X stellarator geometries, the framework
 's fidelity is rigorously demonstrated. In sharp contrast to uncoupled app
 roaches, quantitative convergence tests verify that the coupled scheme att
 ains the theoretically anticipated spectral convergence. This study offers
  a crucial capability for the predictive analysis and optimization of next
 -generation stellarator designs by providing a validated, high-fidelity co
 mputational tool.\n\nSession Chair: Miroslava Nedyalkova (University of Fr
 ibourg)\n\n
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