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DTSTAMP:20210916T132529Z
LOCATION:Lise Girardin
DTSTART;TZID=Europe/Stockholm:20210706T110000
DTEND;TZID=Europe/Stockholm:20210706T130000
UID:submissions.pasc-conference.org_PASC21_sess124@linklings.com
SUMMARY:Towards Exascale Computing in Kinetic Simulations of Magnetic Fusi
 on Plasmas. Part I - Code Developments
DESCRIPTION:Minisymposium\n\nMagnetic fusion plasmas are subject to a plet
 hora of collective effects such as electromagnetic waves and instabilities
 , spanning multiple time- and length- scales. The low collisionality of re
 actor core plasmas makes a kinetic description mandatory for an accurate r
 epresentation. Ions and electrons have very different dynamics, and theref
 ore the problem is intrinsically multi-scale, both in space and time. As w
 e go towards the plasma edge, collisionality increases and the relative fl
 uctuation amplitudes become close to unity. Due to the extreme challenges 
 at hand, fusion plasma computations have always exploited the largest HPC 
 resources available at any point in time, and it is anticipated that will 
 remain so in the foreseeable future. Adapting the codes to the ever changi
 ng landscape of new and emerging computer architectures is a non-trivial c
 hallenge. In this Part I of the minisymposium, the emphasis will be on cod
 e developments and software advances in particular for ensuring the effici
 ent exploitation of  heterogeneous architectures.\n\nECP WDMApp: An Exasca
 le Software Project\n\nEthier, Germaschewski, Suchyta, D'Azevedo, Allen...
 \n\nWhile the most visible achievement of the US DOE Exascale Computing Pr
 oject will certainly be the roll out of 3 exascale computers, the ECP scie
 ntists themselves are primarily involved in software and algorithms develo
 pment aimed at securing a diverse set of exascale-capable codes ready to r
 un at sc...\n\n---------------------\nHow to Prepare the GYSELA Gyrokineti
 c Code to Future Exascale Edge-Core Simulations\n\nGrandgirard, Asahi, Big
 ot, Bourne, Dif-Pradalier...\n\nUnderstanding turbulence and heat transpor
 t in fusion plasmas is a key challenge for future fusion devices like ITER
 . Core transport modelling in tokamak plasmas has now reached maturity wit
 h non-linear 5D gyrokinetic codes in the world available to address this i
 ssue. However, despite numerous succ...\n\n---------------------\nIntegrat
 ed Fusion Simulation at Exascale Using GTC\n\nLin\n\nConfinement propertie
 s in burning plasmas with self-heating by energetic αlpha-particles i
 s one of the most uncertain physics issues when extrapolating from existin
 g fusion plasma experiments to the fusion reactor ITER, the crucial next s
 tep in the quest for the fusion energy. Predictive capabi...\n\n----------
 -----------\nDevelopment of Exascale full-f Gyrokinetic Simulation on Summ
 it and FUGAKU\n\nIdomura\n\nThe Gyrokinetic Toroidal 5D full-f Eulerian co
 de GT5D [Idomura, CPC2008] is based on a semi-implicit finite difference s
 cheme, in which a stiff linear 4D convection operator is subject to implic
 it time integration, and the implicit finite difference solver for fast ki
 netic electrons occupies more th...\n\n\nDomain: CS and Math, Physics
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