Transport Processes In Tokamak Plasmas
Turbulent transport in rotating tokamak plasmas
... In gkw , hybrid parallelism is achieved by subdividing the most CPU inten- sive loops amongst OpenMP threads. The slowest of these is the loop in nonlinear terms, where for each local grid point, 5-7 FFTs in 2D must be ...
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Transport analysis of high radiation and high density plasmas in the ASDEX Upgrade tokamak
... The radial radiation distribution of the electromagnetic radiated power is an essential component of the power balance in tokamaks. It will be even more important in fusion reactors where a non-negligible fraction of the ...
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Calculation of D/XB Values of Hydrocarbon Molecules in Tokamak Edge Plasmas
... and B denotes the excitation rate coefficient from ground state into the electronically excited state and the branching ratio of the observed transition, respectively. In this calcu- lation, the coefficient D is determined ...
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Integrated Particle Transport Simulation of NBI Plasmas in LHD
... particle transport coefficients obtained are ...particle transport coefficient is flat due to the density dependency of the Alcator ...particle transport to reproduce the experimental results of the NBI ...
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Nonlocal Electron Heat Transport in Magnetized Dense Plasmas
... heat transport plays an important role in laser-produced ...heat transport and uniform implosion are ...produced plasmas, a magnetic field will be important because it implicates transport and ...
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Non-diffusive, non-local transport in fluids and plasmas
... As mentioned before, when the statistical moments exhibit anomalous scaling, the advection-diffusion model can not be applied and alternative models must be used. In this paper we review the use of fractional derivatives ...
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Fast particle driven ion cyclotron emission (ICE) in tokamak plasmas and the case for an ICE diagnostic in ITER
... The detection of fast particle-driven waves in the ion cyclotron frequency range (ion cyclotron emission or ICE) could provide a passive, non-invasive diagnostic of confined and escaping fast particles (fusion ...
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Study of Neoclassical Transport in LHD Plasmas by Applying the DCOM/NNW Neoclassical Transport Database
... neoclassical transport is one of the important issues for sustaining high-temperature ...neoclassical transport coefficient increases as collision frequency decreases (1/ν ...cal transport plays an ...
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Transitions to improved confinement regimes induced by changes in heating in zero dimensional models for tokamak plasmas
... Eq.(11). Figure 2 shows that the confinement properties of the ZCD post-heating O-mode are very similar to QH-mode, although weakly dependent on heating. These good confine- ment regimes effectively provide the benchmark ...
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Theoretical Modeling of Transport Barriers in Helical Plasmas
... unified transport model is proposed to study the physical mechanism for the formation of electron internal transport barriers (e-ITB) in helical plasmas and internal di ff usion barriers (IDB) ...
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Spectroscopic diagnostics of superthermal electrons with high-number harmonic EC radiation in tokamak reactor plasmas
... substantial part of heating from fusion alpha-particles and is close to the total auxiliary heating. Also, the fast increase of the EC losses with increasing temperature may have a positive impact on stabilization of ...
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Transport Properties of Charged Particles in Low Pressure Plasmas
... pressure plasmas. Electron transport governed by nonlocal EEPFs is a self-consistent adi- abatic process, during which the electron enthalpy converts into potential energy, therefore being the source of ion ...
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A noninvasive rf probe for the study of ionization and dissociation processes in technological plasmas
... excitation frequency 共 13.56 MHz 兲 that is dependent on the effective plasma capacitance. Resonance frequency shift data are given for He, Ne, Ar, O 2 , N 2 , and N 2 O as a function of both pressure 共 0.02–0.8 mbar 兲 ...
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Internal Transport Barrier Formation and Pellet Injection Simulation in Helical and Tokamak Reactors
... internal transport barrier (ITB) formation due to pellet injection have been simulated in tokamak and helical reactors using the toroidal transport linkage code ...reversed-shear tokamak and ...
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Interpretation of suprathermal emission at deuteron cyclotron harmonics from deuterium plasmas heated by neutral beam injection in the KSTAR tokamak
... (MCF) plasmas, the measured power spectrum of ion cyclotron emission (ICE) typically exhibits multiple narrow peaks whose frequencies are identified with sequential cyclotron harmonics of ions in the emitting ...
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Transport Analysis of High-Z Impurities Including Sawtooth Effects in a Tokamak System
... a tokamak plasma with respect to electron density to maintain Q > ...plified transport model, which reduces the diffusion coeffi- cient and thermal diffusivity near s ∼ ...
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Nonlinear Kinetic Ion Response to Small Scale Magnetic Islands in Tokamak Plasmas : Neoclassical Tearing Mode Threshold Physics
... The shift of the drift island for σ ¼ þ 1 is equal and opposite to that for σ ¼ − 1. In constructing the density, one sums over σ before integrating the distribution function over λ and v. Because the regions where the ...
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Transport in turbulent plasmas at the interface between different levels of description
... We study in detail the previously mentioned scenarios through numerical simula- tions using the hybrid approximation for the plasma, which treat ions as kinetic particles and electrons as a neutralizing massless fluid. ...
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Experimental Study of Nonlinear Processes in Edge Turbulence of Toroidal Plasmas
... nonlinear processes between meso-scale structures and turbulent fluctuations, by use of bispectral analysis, in the edge region of toroidal ...heated plasmas of the JFT-2M tokamak, the drift ...
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Configuration Effects on Local Transport in High-Beta LHD Plasmas
... Recently, plasmas with a β value close to 5% have been obtained in LHD ...such plasmas, the increment in the amplitude of fluctu- ations with beta is gradual, and no disruptive increment in magnetic ...
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