Simulation of Multispecies Impurity Transport in Tokamaks
Title | Simulation of Multispecies Impurity Transport in Tokamaks PDF eBook |
Author | |
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Pages | |
Release | 1978 |
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To simulate multispecies impurity transport in tokamaks, a set of coupled continuity equations including source and sink terms from atomic processes (rate terms) were solved numerically. The diffusion and rate terms are integrated separately in time using a fractional step-splitting technique which is accurate to second order in the time step. Calculations were performed treating individually all the ionization stages of oxygen and iron impurities in a hydrogen plasma. Calculated O VI and O VII relative density profiles agree qualitatively with profiles measured in the Adiabatic Toroidal Compressor (ATC) tokamak when purely neoclassical diffusion coefficients are used.
Simulation of Impurity Transport in Tokamaks I
Title | Simulation of Impurity Transport in Tokamaks I PDF eBook |
Author | T. Amano |
Publisher | |
Pages | 44 |
Release | 1982 |
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Multi-fluid Code Simulations Including Anomalous Non-diffusive Transport of Plasma and Impurities in the Tokamak SOL.
Title | Multi-fluid Code Simulations Including Anomalous Non-diffusive Transport of Plasma and Impurities in the Tokamak SOL. PDF eBook |
Author | |
Publisher | |
Pages | 9 |
Release | 2003 |
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Fast intermittent transport has been observed in the scrape-off layer (SOL) of major tokamaks including Alcator C-Mod, DIII-D, and NSTX. This kind of transport is not diffusive but rather convective. It strongly increases plasma flux to the chamber walls and enhances the recycling of neutral particles in the main chamber. We discuss anomalous cross-field convection (ACFC) model for impurity and main plasma ions and its relation to intermittent transport events, i.e. plasma density blobs and holes in the SOL. Along with plasma diffusivity coefficients, our transport model introduces time-independent anomalous cross-field convective velocity. In the discharge modelling, diffusivity coefficients and ACFC velocity profiles are adjusted to match a set of representative experimental data. We use this model in the edge plasma physics code UEDGE to simulate the multi-fluid two-dimensional transport for these three tokamaks. We present simulation results suggesting the dominance of anomalous convection in the far SOL transport. These results are consistent with the hypothesis that the chamber wall is an important source of impurities and that different impurity charge states have different directions of anomalous convective velocity.
Modelling of multi-component plasma for TOKES
Title | Modelling of multi-component plasma for TOKES PDF eBook |
Author | Yuri Igitkhanov |
Publisher | KIT Scientific Publishing |
Pages | 150 |
Release | 2011 |
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Improved Modelling of Impurity Transport in Tokamaks
Title | Improved Modelling of Impurity Transport in Tokamaks PDF eBook |
Author | Moritz Fichtmüller |
Publisher | |
Pages | 103 |
Release | 1998 |
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Scientific and Technical Aerospace Reports
Title | Scientific and Technical Aerospace Reports PDF eBook |
Author | |
Publisher | |
Pages | 700 |
Release | 1995 |
Genre | Aeronautics |
ISBN |
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Fusion Energy Update
Title | Fusion Energy Update PDF eBook |
Author | |
Publisher | |
Pages | 132 |
Release | 1979 |
Genre | Controlled fusion |
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