Results 11 to 20 of about 892 (228)

Neoclassical transport simulations for stellarators [PDF]

Physics of Plasmas, 2011
The benchmarking of the thermal neoclassical transport coefficients is described using examples of the Large Helical Device (LHD) and TJ-II stellarators. The thermal coefficients are evaluated by energy convolution of the monoenergetic coefficients obtained by direct interpolation or neural network techniques from the databases precalculated by ...
Turkin, Y., Beidler, C. D., Maassberg, H., Murakami, S., Tribaldos, V., Wakasa, A.   +5 more
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Kinetic neoclassical calculations of impurity radiation profiles

Nuclear Materials and Energy, 2017
Modifications of the drift-kinetic transport code XGC0 to include the transport, ionization, and recombination of individual charge states, as well as the associated radiation, are described.
D.P. Stotler, D.J. Battaglia, R. Hager, K. Kim, T. Koskela, G. Park, M.L. Reinke   +6 more
doaj   +1 more source

Energy transport analysis of NSTX plasmas with the TGLF turbulent and NEO neoclassical transport models

Nuclear Fusion, 2023
This work presents a study of plasma transport at low aspect ratio on the National Spherical Torus Experiment tokamak, where the turbulent and neoclassical energy fluxes calculated by the quasilinear Trapped Gyro Landau Fluid (TGLF) model and the multi ...
G. Avdeeva, K.E. Thome, S.P. Smith, D.J. Battaglia, C.F. Clauser, W. Guttenfelder, S.M. Kaye, J. McClenaghan, O. Meneghini, T. Odstrcil, G. Staebler   +10 more
doaj   +1 more source

Neoclassical Transport Including Collisional Nonlinearity

Physical Review Letters, 2011
In the standard δf theory of neoclassical transport, the zeroth-order (Maxwellian) solution is obtained analytically via the solution of a nonlinear equation. The first-order correction δf is subsequently computed as the solution of a linear, inhomogeneous equation that includes the linearized Fokker-Planck collision operator.
J, Candy, E A, Belli
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Locality effects on bifurcation paradigm of L-H transition in tokamak plasmas [PDF]

Songklanakarin Journal of Science and Technology (SJST), 2015
The locality effects on bifurcation paradigm of L-H transition phenomenon in magnetic confinement plasmas are investigated. One dimensional thermal transport equation with both neoclassical and anomalous transports effects included is considered, where
Boonyarit Chatthong, Thawatchai Onjun
doaj  

Preliminary Result of Neoclassical Impurity Transport Affected by ICRH with a 4-D Fokker-Planck Code [PDF]

EPJ Web of Conferences
To understand the role of ion cyclotron resonance heating (ICRH) in mitigating tungsten accumulation, we evaluate the impact of ICRH-induced poloidal asymmetries on neoclassical impurity transport using a newly developed 4-D Fokker–Planck code (FP4D ...
Jeong Yunho, Lee Hyeonjun, Bertelli Nicola, Yoon Eisung, Lee Jungpyo   +4 more
doaj   +1 more source

Neoclassical toroidal plasma viscosity in bounce-transit and drift resonance regimes in tokamaks

Nuclear Fusion, 2023
Neoclassical toroidal plasma viscosity in the bounce-transit and drift resonance regimes is calculated using a version of the drift kinetic equation that encompasses the physics of the nonlinear trapping and quasilinear plateau regimes in tokamaks. It is
K.C. Shaing, M. Garcia-Munoz, E. Viezzer
doaj   +1 more source

Prevention of core particle depletion in stellarators by turbulence

Physical Review Research, 2023
In reactor-relevant plasmas, neoclassical transport drives an outward particle flux in the core of large stellarators and predicts strongly hollow density profiles. However, this theoretical prediction is contradicted by experiments.
H. Thienpondt, J. M. García-Regaña, I. Calvo, J. A. Alonso, J. L. Velasco, A. González-Jerez, M. Barnes, K. Brunner, O. Ford, G. Fuchert, J. Knauer, E. Pasch, L. Vanó   +12 more
doaj   +1 more source

Neoclassical transport in a elliptic tokamak [PDF]

The Physics of Fluids, 1977
Neoclassical transport for an elliptic tokamak in all collisional regimes is investigated by the technique of partitioning the velocity space. It is found that in a tokamak of moderate elongation, particle and ion heat confinement times are increased by a factor of sigma/sup 2/, where sigma is the ratio of vertical minor radius to horizontal minor ...
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Neoclassical transport optimization of LHD

Nuclear Fusion, 2002
Neoclassical transport is studied for large helical device (LHD) configurations in which the magnetic axis has been shifted radially by determining the mono-energetic transport coefficient and the effective helical ripple. With respect to the transport in the long mean-free-path collisionality region—the so-called 1/ν transport—the optimum ...
Murakami, S., Wakasa, A., Maaßberg, H., Beidler, C., Yamada, H., Watanabe, K., LHD Experimental Group   +6 more
openaire   +2 more sources