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DTSTAMP:20250822T115804Z
LOCATION:Room 5.0B56
DTSTART;TZID=Europe/Stockholm:20250617T120000
DTEND;TZID=Europe/Stockholm:20250617T123000
UID:submissions.pasc-conference.org_PASC25_sess122_msa121@linklings.com
SUMMARY:Accelerated Neutral Solvers for Plasma Simulations
DESCRIPTION:Margherita Guido (EPFL, EPFL-SPC); Daniel Kressner (EPFL); and
  Paolo Ricci (EPFL-SPC)\n\nThe simulation of turbulence in the boundary re
 gion of a tokamak is crucial for understanding and optimizing the performa
 nce of fusion reactors. However, these simulations pose significant comput
 ational challenges due to the complex plasma dynamics at the boundary. In 
 this talk, we explore how low-rank linear algebra techniques can enhance t
 he efficiency of boundary simulations, specifically by accelerating the co
 mputation of neutral particle dynamics. When modeled deterministically, th
 is problem leads to the solution of integral equations, which typically re
 sult in dense linear systems upon discretization. We employ hierarchical m
 atrix approximations to significantly reduce the computational cost of ass
 embling and solving linear systems, leading to substantial savings in both
  time and memory. Our method is implemented and tested within the GBS fram
 ework, achieving over 90% reduction in computation time and memory and ena
 bling simulations with unprecedented spatial resolution for neutral partic
 les. The scalability of this approach represents a critical step towards s
 imulating turbulence in larger fusion reactors, facilitating high-resoluti
 on studies of plasma-neutral interactions and enhancing the safety and ope
 rational efficiency of fusion devices.\n\nDomain: Physics, Computational M
 ethods and Applied Mathematics\n\nSession Chair: Eric Sonnendrücker (Max P
 lanck Institute for Plasma Physics, Technical University of Munich)\n\n
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