Runaway electron modelling in the self-consistent core European Transport Simulator
Artikel i vetenskaplig tidskrift, 2019

Relativistic runaway electrons are a major concern in tokamaks. Although significant theoretical development had been undertaken in recent decades, we still lack a self-consistent simulator that could simultaneously capture all aspects of this phenomenon. The European framework for Integrated Modelling (EU-IM) facilitates the integration of different plasma simulation tools by providing a standard data structure for communication that enables relatively easy integration of different physics codes. A three-level modelling approach was adopted for runaway electron simulations within the EU-IM. Recently, a number of runaway electron modelling modules have been integrated into this framework. The first level of modelling (Runaway Indicator) is limited to the indication if runaway electron generation is possible or likely. The second level (Runaway Fluid) adopts an approach similar to e.g. the GO code, using analytical formulas to estimate changes in the runaway electron current density. The third level is based on the solution of the electron kinetics. One such code is LUKE that can handle the toroidicity-induced effects by solving the bounce-averaged Fokker-Planck equation. Another approach is used in NORSE, which features a fully nonlinear collision operator that makes it capable of simulating major changes in the electron distribution, for example slide-away. Both codes handle the effect of radiation on the runaway distribution. These runaway-electron modelling codes are in different stages of integration into the EU-IM infrastructure, and into the European Transport Simulator (ETS), which is a fully capable modular 1.5D core transport simulator. The ETS with Runaway Fluid was benchmarked to the GO code implementing similar physics. Coherent integration of kinetic solvers requires more effort on the coupling, especially regarding the definition of the boundary between runaway and thermal populations, and on consistent calculation of resistivity. Some of these issues are discussed.

tokamak

integrated modelling

transport solver

runaway electron

plasma

Författare

Pokol

Budapesti Muszaki es Gazdasagtudomanyi Egyetem

Soma Olasz

Budapesti Muszaki es Gazdasagtudomanyi Egyetem

Boglarka Erdos

Budapesti Muszaki es Gazdasagtudomanyi Egyetem

Gergely Papp

Max Planck-institutet

Matyas Aradi

Technische Universität Graz

Mathias Hoppe

Chalmers, Fysik, Subatomär fysik och plasmafysik

Thomas Johnson

Kungliga Tekniska Högskolan (KTH)

Jorge Ferreira

Universidade de Lisboa

David Coster

Max Planck-institutet

Yves Peysson

Le Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)

Joan Decker

Ecole Polytechnique Federale De Lausanne

Pär Strand

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Plasmafysik och fusionsenergi

Dimitriy Yadykin

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Plasmafysik och fusionsenergi

Denis Kalupin

EUROfusion Programme Management Unit

Nuclear Fusion

0029-5515 (ISSN)

Vol. 59 7 076024

Ämneskategorier

Fusion, plasma och rymdfysik

DOI

10.1088/1741-4326/ab13da

Mer information

Senast uppdaterat

2019-09-05