Vlasov modelling of parallel transport in a tokamak scrape-off layer

نویسندگان

  • Giovanni Manfredi
  • Sever Adrian Hirstoaga
  • Stéphane Devaux
  • G. Manfredi
  • S. Hirstoaga
  • S. Devaux
چکیده

A one-dimensional Vlasov-Poisson model is used to describe the parallel transport in a tokamak scrape-off layer. Thanks to a recently-developed ‘asymptoticpreserving’ numerical scheme, it is possible to lift numerical constraints on the time step and grid spacing, which are no longer limited by, respectively, the electron plasma period and Debye length. The Vlasov approach provides a good velocityspace resolution even in regions of low density. The model is applied to the study of parallel transport during edge-localized modes (ELMs), with particular emphasis on the particles and energy fluxes on the divertor plates. The numerical results are compared to analytical estimates based on a free-streaming model, with good general agreement. An interesting feature is the observation of an early electron energy flux, due to suprathermal electrons escaping the ions’ attraction. In contrast, the long-time evolution is essentially quasi-neutral and dominated by the ion dynamics. Parallel transport in a tokamak scrape-off layer 2

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

The Scrape - Off - Layer in Alcator C - Mod – Transport , Turbulence , and Flows

Research on the scrape-off-layer plasma of the Alcator C-Mod Tokamak is reviewed. The research has focused on understanding the transport of energy and particles both parallel and perpendicular to the magnetic field. Large differences between the inboard, high-field side scrape-off-layer and the outboard, low-field side are found. On the outboard side large levels of anomalous cross-field trans...

متن کامل

A theoretical interpretation of the main scrape-off layer heat-flux width scaling for tokamak inner-wall limited plasmas

The International Tokamak Physics Activity Topical Group on scrape-off layer and divertor physics has amassed a database comprising hundreds of reciprocating Langmuir probe measurements of the main scrape-off layer heat-flux width λq in inner-wall limited discharges. We have carried out an analysis, based on turbulent transport theory, of the variation of λq with respect to the dimensionless pl...

متن کامل

Statistical analysis and modeling of intermittent transport events in the tokamak SOL Statistical analysis and modeling of intermittent transport events in the tokamak scrape-off layer

Statistical analysis and modeling of intermittent transport events in the tokamak scrape-off layer Johan Anderson, a) Federico D. Halpern, Pavlos Xanthopoulos, Paolo Ricci, and Ivo Furno Department of Earth and Space Sciences, Chalmers University of Technology, SE-412 96 Göteborg, Sweden École Polytechnique Fédérale de Lausanne (EPFL), Centre de Recherches en Physique des Plasmas, CH-1015 Lausa...

متن کامل

Parallel transport in a tokamak scrape-off layer

G. Manfredi1, S. Hirstoaga2, S. Devaux3, E. Havlíčková4, D. Tskhakaya5 1 Institut de Physique et Chimie des Matériaux, Strasbourg, France 2 INRIA and Institut de Recherche en Mathématiques Avancées, Strasbourg, France 3 Max-Planck-Institut für Plasmaphysik, Garching, Germany 4 Culham Centre for Fusion Energy, Abingdon, United Kingdom 5 Institute for Theoretical Physics, University of Innsbruck,...

متن کامل

The Influence of Filaments on Scrape-Off Layer Transport in MAST

The tokamak scrape-off-layer (SOL) is a primary component of the interface between the core plasma and the material surfaces of the vacuum vessel. Investigations on the Mega-Ampere Spherical Tokamak (MAST) have been undertaken in an effort to characterise the filamentary nature of the SOL and to assess the influence of this intermittency on traditional steady-state approximations of the plasma ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2017