Vlasov Simulation of the Microturbulence

Watanabe, Toshiya

doi:10.1585/jspf.81.686

Cited by 14 publications

(25 citation statements)

References 30 publications

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“…8 The transport coefficients L 1 ␣ and L 2 ␣ are formulated in the conventional neoclassical transport theory. 9,10 The Ohmic current can be written as j oh = ͑e 2 n e ee / m e ͒L E ͑͗BE ʈ ͘B / ͗B 2 ͒͘, where ee =3 1/2 /4 ee , ee is the el-el collision frequency.…”

mentioning

confidence: 99%

Neoclassical reversed-field pinch equilibrium with dominant self-induced plasma current

et al. 2005

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The neoclassical magnetohydrodynamic equilibrium of reversed-field pinch (RFP) is self-consistently solved considering the self-induced plasma current IϕSI in a reactor relevant parameter regime. The current IϕSI consists of bootstrap currents due to α particles as well as the bulk plasma, where the conventional neoclassical transport theory is applied without considering the finite banana-width effect, Pfirsch–Schluter current, and diamagnetic current. The neoclassical effect enhances IϕSI in a low-aspect-ratio RFP (aspect ratio A=2), when β is high. An IϕSI as high as 94.4% of the plasma current in the equilibrium with ellipticity κ=1.4 and triangularity δ=0.4 is obtained with a flat pressure profile, which provides a toroidal β of βt=63% (volume-averaged β, ⟨β⟩=66%) stable against both the ideal kink mode and Mercier mode. This dominant self-induced current makes the steady-state approach feasible. Its hollow current profile gives a strong magnetic shear and a high-stability β.

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confidence: 99%

Neoclassical reversed-field pinch equilibrium with dominant self-induced plasma current

et al. 2005

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“…In order to trace the re-entering particles appropriately, the particleloss boundary must be set on the vacuum vessel wall, i.e., the particles reaching the vacuum vessel wall are regarded as the lost particles. Therefore, the rotating helical coordinate system [11] is adopted. We use the 6th-order Runge-Kutta formulas [12] and three-dimensional higherorder spline function [13] to accurately trace the complicated orbits of the particles in the plasma periphery.…”

Section: Methodsmentioning

confidence: 99%

Particle Orbit Analysis in the Finite Beta Plasma of the Large Helical Device using Real Coordinates

Seki

Matsumoto

Suzuki

et al. 2008

Plasma and Fusion Research

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High-energy particles in a finite beta plasma of the Large Helical Device (LHD) are numerically traced in a real coordinate system. We investigate particle orbits by changing the beta value and/or the magnetic field strength. No significant difference is found in the particle orbit classifications between the vacuum magnetic field and the finite beta plasma cases. The deviation of a banana orbit from the flux surfaces strongly depends on the beta value, although the deviation of the orbit of a passing particle is independent of the beta value. In addition, the deviation of the orbit of the passing particle, rather than that of the banana-orbit particles, depends on the magnetic field strength. We also examine the effect of re-entering particles, which repeatedly pass in and out of the last closed flux surface, in the finite beta plasma of the LHD. It is found that the number of re-entering particles in the finite beta plasma is larger than that in the vacuum magnetic field. As a result, the role of reentering particles in the finite beta plasma of the LHD is more important than that in the vacuum magnetic field, and the effect of the charge-exchange reaction on particle confinement in the finite beta plasma is large.

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“…In particular, a number of experiments on high-␤ stellarator configurations have shown no discernable degradation in the plasma operation when operating in a Mercier unstable region ͑D I Ͼ 1 / 4͒. [5][6][7][8][9] The physics of what controls the ␤ limit in currentless stellarator operation is a topic of considerable interest. Understanding why Mercier stability predictions do not limit operation is a primary motivation for the work presented here.…”

Section: ͒mentioning

confidence: 99%

Compressibility effect on magnetic-shear-localized ideal magnetohydrodynamic interchange instability

2005

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Vlasov Simulation of the Microturbulence

Cited by 14 publications

References 30 publications

Neoclassical reversed-field pinch equilibrium with dominant self-induced plasma current

Neoclassical reversed-field pinch equilibrium with dominant self-induced plasma current

Particle Orbit Analysis in the Finite Beta Plasma of the Large Helical Device using Real Coordinates

Compressibility effect on magnetic-shear-localized ideal magnetohydrodynamic interchange instability

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