Fluid features of the stochastic layer transport in LHD

Feng, Y.; Kobayashi, M.; Morisaki, T.; Masuzaki, S.; Miyazawa, J.; Peterson, B.J.; Morita, S.; Shoji, M.; Ida, K.; Yamada, I.; Narihara, K.; Ashikawa, N.; Yamada, H.; Ohyabu, N.; Komori, A.; Motojima, O.; Sardei, F.; Reiter, D.

doi:10.1088/0029-5515/48/2/024012

Cited by 43 publications

(58 citation statements)

References 20 publications

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“…In typical parameters of LHD experiments, the collisionality is expected the Rechester-Rosenbluth (RR) regime in the region expected stochastically because χ || /χ ⊥ ∼ 10 6 [9][10][11]. The radial heat conductivity due to the stochasticity of field lines is given by…”

Section: Radial Heat Diffusivity Due To Stochastic Field Linesmentioning

confidence: 99%

“…In order to compare χ r with the experimental data, it is necessary to analyze the local transport in the stochastic region (R > 4.5 m). The comparison of that and other estimation, which are obtained from the transport code for the edge plasma [9,17], is a future subject. In tokamaks, it is pointed out that the RR formulation is larger than results of simulated studies [12,13].…”

Section: Radial Heat Diffusivity Due To Stochastic Field Linesmentioning

confidence: 99%

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Effects of the Stochasticity on Transport Properties in High-β LHD

Suzuki

Watanabe

Funaba

et al. 2009

Plasma and Fusion Research

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Effects of the stochasticity of magnetic field lines on transport properties are investigated. In a high-β LHD plasma, the structure of field lines in the peripheral region becomes stochastic by finite-β effects but the finite pressure gradient exists in that region. The radial diffusion coefficient and the Kolmogorov length of stochastic field lines are estimated. In the stochastic region, the radial diffusion of stochastic field lines becomes large and the Kolmogorov length becomes short due to increasing β. In that region, the radial heat transport becomes large due to the stochasticity of field lines.

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Section: Radial Heat Diffusivity Due To Stochastic Field Linesmentioning

confidence: 99%

Section: Radial Heat Diffusivity Due To Stochastic Field Linesmentioning

confidence: 99%

Effects of the Stochasticity on Transport Properties in High-β LHD

Suzuki

Watanabe

Funaba

et al. 2009

Plasma and Fusion Research

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“…It provides a self-consistent fluid treatment of particle, parallel momentum and electron and ion energy transport for the plasma as well as recycling and kinetic neutral particle transport. It is regularly applied to stellarator configurations such as W7-AS, W7-X and LHD [10,11,12,13] and, since resent years, also to tokamak configurations. These latter include limiter configurations e.g.…”

Section: Introductionmentioning

confidence: 99%

On gas flow effects in 3D edge transport simulations for DIII-D plasmas with resonant magnetic perturbations

et al. 2012

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Abstract. Pumping of neutral gas and re-fuelling in other locations (e.g. neutral beam injection, gas puffing) is a key ingredient in divertor physics. However, this has not been included in previous 3D edge plasma transport simulations with the EMC3-EIRENE code. Including these effects brings the simulations closer to reality and we demonstrate that this has a significant impact on divertor parameters. In particular, we study the impact of the pumping efficiency on ITER similar shape plasmas at the DIII-D tokamak in the presence of resonant magnetic perturbations (RMPs). Further, we investigate the so called "particle pump-out effect". We show that in the present transport model and for given pumping and re-fuelling rates, the density at the transition to the core region decreases with increasing perturbation current, but the temperature as well. The striation patterns in the target particle and heat fluxes are extended into the regular SOL, which is caused by cross-field transport into a thin layer around the perturbed separatrix.

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“…4, the measured profiles have steeper gradient than simulated profiles in the inner region (R < 4.65 m). It was pointed out in reference [7] that the transport property should be changed at this region, and the simulation using constant cross-field transport coefficients cannot reproduce the measured profiles in the inner and outer regions simultaneously. In this study, the cross-field transport coefficients were selected to fit the outer region.…”

Section: Resultsmentioning

confidence: 97%

“…Plasma transport in the LHD SOL has been investigated experimentally using Thomson scattering measurement [4] and Langmuir probes [5], and theoretically using three dimensional edge transport code, EMC3-EIRENE [6,7]. For example, it was revealed with the simulation that the perpendicular transport is comparable to parallel transport in the LHD SOL, and counter flows induced by the ergodic field lines break the pressure conservation along flux tubes through the friction [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the influence of plasma properties and SOL transport on the particle flux profiles on divertor plates in the Large Helical Device

Masuzaki

Kobayashi

Morisaki

et al. 2009

Journal of Nuclear Materials

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Particle flux profiles on the divertor plates and the electron temperature profiles in the scrape-off layer (SOL) in the Large Helical Device (LHD) heliotron were investigated with EMC3-EIRENE code. These profiles are modified during a discharge due to the changes of the edge plasma density and temperature those can cause the change of transport coefficient.Comparison of the edge electron temperature profiles between the measurements and the simulations revealed that the cross field transport coefficients in the LHD scrape-off layer depend on plasma parameters, especially electron temperature. For the particle flux profile on the divertor plates, the absolute value of the simulation results with the transport coefficient consistent with the edge temperature profile analysis were well agree with the experimental data, though the profile shapes of experimental data were not necessarily reproduced well by the simulation.

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Fluid features of the stochastic layer transport in LHD

Cited by 43 publications

References 20 publications

Effects of the Stochasticity on Transport Properties in High-β LHD

Effects of the Stochasticity on Transport Properties in High-β LHD

On gas flow effects in 3D edge transport simulations for DIII-D plasmas with resonant magnetic perturbations

Investigation on the influence of plasma properties and SOL transport on the particle flux profiles on divertor plates in the Large Helical Device

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