Results 21 to 30 of about 559 (132)

NEOCLASSICAL TRANSPORT THEORY OF A MULTICOMPONENT PLASMA

Acta Physica Sinica, 1984
The neoclassical scaling relations satisfying kenetic requirements are derived for a mul-ticomponent plasma in an axisymmetric toroidal magnetic configuration, using a model collision-operator and the variational principle developed by Rosenbluth and Glasser.
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Comparable levels of turbulent and neoclassical transport of high-Z impurities: integrated modelling in AUG, JET and C-Mod

Nuclear Fusion
Operation with beam heating is prone to central accumulation of high- Z impurities in present-day tokamaks due to a dominant neoclassical pinch. Fusion reactors are expected to have a different core transport regime for high- Z impurities, where ...
D. Fajardo, C. Angioni, C. Giroud, C. Perks, A. Loarte, M. Poradzinski, J. Rice, O. Samoylov, I. Carvalho, Z. Huang, D. Keeling, D. King, D. Kos, B. Labit, E. Litherland-Smith, S. Menmuir, N. Vianello, the ASDEX Upgrade Team, JET Contributors, the EUROfusion Tokamak Exploitation Team   +19 more
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Self-consistent, global, neoclassical radial-electric-field calculations of electron-ion-root transitions in the W7-X stellarator

Nuclear Fusion
The radial electric field in the Wendelstein 7-X stellarator is computed by means of self-consistent, global, neoclassical simulations using the gyrokinetic particle-in-cell code EUTERPE.
M.D. Kuczyński, R. Kleiber, H.M. Smith, C.D. Beidler, M. Borchardt, J. Geiger, P. Helander   +6 more
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Neoclassical transport theory of a multispecies plasma in the low collision frequency regime

The Physics of Fluids, 1975
A comprehensive neoclassical transport theory for a multispecies plasma in the low collision frequency banana regime is developed. A recently developed approximate collision operator is used to analytically calculate the transport coefficients in a nonisothermal, finite beta plasma for arbitrary mass ratios and all values of the aspect ratio.
S. P. Hirshman, D. J. Sigmar, J. F. Clarke   +2 more
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Investigation of multi-ion heat and neoclassical transport using new edge main ion measurements at ASDEX Upgrade

Nuclear Fusion
This study provides new insights into multi-ion heat transport and the validation of neoclassical theory at the edge of H-mode plasmas. Utilizing a high-resolution main ion charge exchange recombination spectroscopy system, the first characterization of ...
P. Cano-Megias, E. Viezzer, R.M. McDermott, C. Angioni, E. Fable, A. Jansen van Vuuren, M. Cavedon, D.J. Cruz-Zabala, R. Dux, P. Manas, J. P.-Gonzalez, R. Takacs, C.F.B. Zimmermann, R. Chacartegui, the ASDEX Upgrade Team, the EUROfusion Tokamak Exploitation Team   +15 more
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Lagrangian neoclassical transport theory applied to the region near the magnetic axis

Physics of Plasmas, 2002
Neoclassical transport theory around the magnetic axis of a tokamak is studied, in which relatively wide “potato” orbits play an important role in transport. Lagrangian formulation of transport theory, which has been investigated to reflect finiteness of guiding-center orbit widths to transport equations, is developed in order to analyze neoclassical ...
Shinsuke Satake, Masao Okamoto, Hideo Sugama   +2 more
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Quasilinear theory and modelling of gyrokinetic turbulent transport in tokamaks

Nuclear Fusion
The theory, development, and validation of reduced quasilinear models of gyrokinetic turbulent transport in the closed flux surface core of tokamaks is reviewed.
G. Staebler, C. Bourdelle, J. Citrin, R. Waltz   +3 more
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Radiative damping of toroidal Alfvén eigenmode in low-shear plasmas

Fundamental Plasma Physics
Instabilities of Alfvén eigenmodes (AEs) are of significant concern because they can enhance the cross-field transport of fusion-born alpha particles beyond the neoclassical level in magnetic fusion plasmas. The threshold value of alpha-particle pressure
B.N. Breizman, S.E. Sharapov
doaj   +1 more source

Magnetic-island induced geometric stabilization of turbulence triggering eITB bifurcation

Nuclear Fusion
We demonstrate that geometric deformation of flux-surface induced by a magnetic island can trigger the bifurcation to an electron internal transport barrier (eITB) through a novel positive feedback loop arising from the nonlinear coupling between the ...
Zhangsheng Huang, Nengchao Wang, Weixin Guo, Lu Wang   +3 more
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Analysis of Radial Electric Field Bifurcation in LHD Based on Neoclassical Transport Theory

Journal of Plasma and Fusion Research, 2003
Radial electric field (Er) properties in LHD have been investigated based on the neoclassical transport theory and have also been applied to LHD experimental results. The effects of the helicity of the magnetic configuration on the condition required to realize the electron root are examined.
Masayuki YOKOYAMA, Katsumi IDA, Takashi SHIMOZUMA, Kiyomasa WATANABE, Shin KUBO, Yasuhiko TAKEIRI, Kazumichi NARIHARA, Shigeru MORITA, Kenji TANAKA, Sadayoshi MURAKAMI, Hiroshi IDEI, Yasuo YOSHIMURA, Takashi NOTAKE, Masaki OSAKABE, Nobuyoshi OHYABU, Kimitaka ITOH, Keisuke MATSUOKA, Osamu MOTOJIMA, null LHD Experimental Group   +18 more
openaire   +2 more sources