نتایج جستجو برای: tokamak

تعداد نتایج: 4114  

2013
M. Hirota P. J. Morrison Y. Ishii M. Yagi N. Aiba

A mechanism for fast magnetic reconnection in collisionless plasma is studied for understanding sawtooth collapse in tokamak discharges using a two-fluid model for cold ions and electrons. Explosive growth of the tearing mode enabled by electron inertia is analytically estimated using an energy principle with a nonlinear displacement map. Decrease in the potential energy in the nonlinear regime...

2015
K. Ida T. Kobayashi T. E. Evans S. Inagaki M. E. Austin M. W. Shafer S. Ohdachi Y. Suzuki S.-I. Itoh K. Itoh

The coupling between the transport and magnetic topology is an important issue because the structure of magnetic islands, embedded in a toroidal equilibrium field, depends on the nature of the transport at the edge of the islands. Measurements of modulated heat pulse propagation in the DIII-D tokamak have revealed the existence of self-regulated oscillations in the radial energy transport into ...

Journal: :The Review of scientific instruments 2010
G S Yun W Lee M J Choi J B Kim H K Park C W Domier B Tobias T Liang X Kong N C Luhmann A J H Donné

The ECE imaging (ECEI) diagnostic tested on the TEXTOR tokamak revealed the sawtooth reconnection physics in unprecedented detail, including the first observation of high-field-side crash and collective heat transport [H. K. Park, N. C. Luhmann, Jr., A. J. H. Donné et al., Phys. Rev. Lett. 96, 195003 (2006)]. An improved ECEI system capable of visualizing both high- and low-field sides simultan...

2008
Kozo YAMAZAKI Ikuhiro YAMADA Tetsutarou OISHI Hideki ARIMOTO Tatsuo SHOJI

The impurity transport simulation code TOTAL (TOroidal Transport Analysis Linkage) consisting of 1-D(dimensional) transport and 2or 3-D equilibrium is developed for analyzing tokamak and helical burning plasmas controlled by feedback scheme with gas puffing, pellet fueling injection and heating power modulations. In this code multi-species of impurity ions can be treated including neoclassical ...

2004
K. L. Wong

Alfvén instabilities excited by energetic ions are used as a means to reduce the central magnetic shear in a tokamak via redistribution of energetic ions. When the central magnetic shear is low enough, ballooning modes become stable for any plasma pressure gradient and an internal transport barrier (ITB) with a steep pressure gradient can exist. This mechanism can sustain a steady-state ITB as ...

2008
S. Yu. Medvedev Y. Hu A. A. Martynov L. Villard

Several tokamak experiments have reported the existence of plasma equilibria with a zero total toroidal current in their AC operations. By taking a plasma profile model based on linear functions of the poloidal flux function ψ , a variety of equilibrium configurations with a zero total toroidal current have been found. The MHD_N0 stability code [1] is able to compute axisymmetric mode stability...

2015
Ge Li

A Faraday wheel (FW)-an electric generator of constant electrical polarity that produces huge currents-could be implemented in an existing tokamak to study high-gain high-field (HGHF) fusion plasma, such as the Experimental Advanced Superconducting Tokamak (EAST). HGHF plasma can be realized in EAST by updating its pulsed-power system to compress plasma in two steps by induction fields; high ga...

2004
G. O. Ludwig E. Del Bosco J. G. Ferreira

Abstract. A series of calculations and measurements have been made to evaluate the effect of eddy currents in the spherical tokamak ETE (Experimento Tokamak Esférico). Eddy currents occur in the central column of the conventional copper toroidal field magnet, around which the ohmic heating solenoid was tightly wound, and in the continuous wall of the vacuum vessel manufactured from inconel allo...

2010
A H Hakim J R Cary J Candy J Cobb R H Cohen T Epperly D J Estep S Krasheninnikov A D Malony D C McCune L McInnes A Pankin S Balay J A Carlsson M R Fahey R J Groebner S E Kruger M Miah A Pletzer S Shasharina S Vadlamani D Wade-Stein T D Rognlien A Morris S Shende G W Hammett K Indireshkumar A Yu Pigarov H Zhang

The FACETS project aims to provide computational tools for whole device simulation of tokamak transport for use in fusion applications. The framework provides flexibility by allowing users to choose the best model for a given physics target. Our goals are to develop accurate transport solvers using neoclassical and turbulent fluxes with varying degree of fidelity and computational complexity, i...

2000
G. S. Lee

The extensive design effort has been focused on two major aspects of the KSTAR project mission, steady-state operation capability and “advanced tokamak” physics. The steady-state aspect of mission is reflected in the choice of superconducting magnets, provision of actively cooled in-vessel components, and longpulse current-drive and heating systems. The “advanced tokamak” aspect of the mission ...

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