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DTSTAMP:20260624T171341Z
LOCATION:Bldg. 6 - 003
DTSTART;TZID=Europe/Stockholm:20260630T134500
DTEND;TZID=Europe/Stockholm:20260630T141500
UID:submissions.pasc-conference.org_PASC26_sess142_msa160@linklings.com
SUMMARY:Leveraging Exascale Computing for Multiscale Turbulence Simulation
  of Fusion Plasmas
DESCRIPTION:Emily A. Belli and Jeff Candy (General Atomics) and Igor Sfili
 goi (University of California San Diego)\n\nPredicting turbulence and tran
 sport in burning plasma regimes is central to designing future fusion pilo
 t plants with optimal energy confinement and fusion performance.  CGYRO is
  a scalable, GPU-optimized 5D gyrokinetic solver for multiscale electromag
 netic plasma turbulence.  This turbulence bridges ion and electron spatio-
 temporal scales spanning many orders of magnitude.  The code is widely use
 d by the global fusion community and private fusion companies.  CGYRO supp
 orts all modern GPU architectures, including NVIDIA, AMD, and Intel GPUs, 
 and is well-suited for capability-scale simulation on exascale systems suc
 h as OLCF Frontier and ALCF Aurora.  We present on emerging HPC and physic
 s capabilities and performance optimizations of CGYRO targeting next-gener
 ation multi-exascale leadership-class systems.  CGYRO has pioneered advanc
 ed numerical algorithms for Eulerian gyrokinetic simulation, including bot
 h high-order and spectrally-accurate discretizations, and scalable array d
 istribution schemes. Essential components include full GPU-offloading, lev
 eraging GPU-aware MPI to minimize communication costs, and hipFFT librarie
 s optimized for large wavenumber counts.  CGYRO also implements a novel, n
 umerically efficient hybrid global-spectral method for non-local effects t
 hat avoids spurious effects due to Dirichlet boundary conditions, and adap
 tive time-stepping that gives fast solution for multiscale systems with st
 iff nonadiabatic electron physics, electromagnetic perturbations, and nonl
 inear dynamics. This work is supported by US DOE DE-SC0024425.\n\nDomain: 
 Physics, Computational Methods and Applied Mathematics\n\nSession Chair: E
 ric Sonnendrücker (Max Planck Institute for Plasma Physics, Technical Univ
 ersity of Munich)\n\n
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