Integrated Modeling of Whole Tokamak Plasma

Development and integration of models for the whole tokamak plasma have progressed on the basis of experimental analyses and first principle simulations. Integrated models of core, edge-pedestal and scrape-offlayer (SOL)-divertor clarified complex and autonomous features of reactor relevant plasmas. The integrated core plasma model including an anomalous transport of alpha particles by Alfven eigenmodes is developed in the core transport code TOPICS-IB and indicates the degradation of fusion performance. The integrated rotation model is developed in the advanced transport code TASK/TX and clarifies the mechanism of alpha particle-driven toroidal flow. A transport model of high-Z impurities is developed and predicts large inward pinch in a plasma rotating in the direction counter to the plasma current. TOPICS-IB is extended to include the edge-pedestal model by integrating with the stability code, simple SOL-divertor and pellet models, and clarifies the mechanism of pellet triggered ELM. The integrated SOL-divertor code SONIC is further integrated with TOPICS-IB and enables to study and design operation scenarios compatible with both the high confinement in the core and the low heat load on divertor plates.

[1]  Tomonori Takizuka,et al.  Integrated simulation of ELM energy loss determined by pedestal MHD and SOL transport , 2007 .

[2]  Shinji Tokuda,et al.  Extension of the Newcomb equation into the vacuum for the stability analysis of tokamak edge plasmas , 2006, Comput. Phys. Commun..

[3]  N. Oyama.  Progress and issues in understanding the physics of ELM dynamics, ELM mitigation, and ELM control , 2008 .

[4]  T. Takizuka,et al.  Effect of core pressure gradient just inside the top of the pedestal on the energy loss due to the edge localized mode in JT-60U , 2011 .

[5]  M. Honda,et al.  Dynamic transport simulation code including plasma rotation and radial electric field , 2008, J. Comput. Phys..

[6]  V. Parail,et al.  Integrated simulation of ELM triggered by a pellet through energy absorption and transport enhancement , 2011 .

[7]  S. Günter.  IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems , 2008 .

[8]  Hiroshi Shirai,et al.  Characteristics of internal transport barriers in JT-60U reversed shear plasmas , 2001 .

[9]  Y. Kamada,et al.  SlimCS—compact low aspect ratio DEMO reactor with reduced-size central solenoid , 2007 .

[10]  T. Takizuka,et al.  Accumulation Process of High‐Z Impurity in Toroidal Rotating Tokamak Plasma , 2010 .

[11]  Y. Kamada,et al.  Observation of an energetic-particle-driven instability in the wall-stabilized high-beta plasmas in the JT-60U tokamak. , 2009, Physical review letters.

[12]  W. Houlberg,et al.  Bootstrap current and neoclassical transport in tokamaks of arbitrary collisionality and aspect ratio , 1997 .

[13]  A. Fukuyama,et al.  Confinement degradation and transport of energetic ions due to Alfvén eigenmodes in JT-60U weak shear plasmas , 2007 .

[14]  Self-consistent simulation of torque generation by radial current due to fast particles , 2009 .

[15]  A. Fukuyama.  Integrated Transport Simulation of Burning Plasmas , 2009 .

[16]  Keiji Tani,et al.  Effect of Toroidal Field Ripple on Fast Ion Behavior in a Tokamak , 1981 .

[17]  V. Parail,et al.  Integrated simulation of ELM energy loss and cycle in improved H-mode plasmas , 2009 .

[18]  Nobuhiko Hayashi,et al.  Advanced tokamak research with integrated modeling in JT-60 Upgradea) , 2010 .

[19]  T. Ozeki,et al.  High-beta steady-state research with integrated modeling in the JT-60 Upgradea) , 2007 .

[20]  T. Takizuka,et al.  Alpha particle-driven toroidal rotation in burning plasmas , 2011 .

[21]  T. Takizuka,et al.  Numerical analysis of the effect of fast-ion losses on plasma rotation in a tokamak with toroidal field ripple , 2008 .

[22]  J. W. Van Dam,et al.  Excitation of the toroidicity-induced shear Alfvén eigenmode by fusion alpha particles in an ignited tokamak , 1989 .

[23]  Naoyuki Oyama,et al.  Overview of JT-60U results towards the establishment of advanced tokamak operation , 2009 .