Results 1 to 10 of about 120,584 (295)
Nuclear Materials and Energy, 2022 Tungsten (W) impurity transport and the corresponding core W accumulation is a critical issue in tokamak with W as plasma facing material. In this work, a kinetic W impurity transport code based on the guiding center approximation is applied for the ...
Yihan Wu +5 more
doaj +3 more sources
On neoclassical impurity transport in stellarator geometry [PDF]
Plasma Physics and Controlled Fusion, 2013 The impurity dynamics in stellarators has become an issue of moderate concern due to the inherent tendency of the impurities to accumulate in the core when the neoclassical ambipolar radial electric field points radially inwards (ion root regime).
Beidler C D +14 more
core +4 more sources
Topological transport of mobile impurities [PDF]
Physical Review B, 2021 We study the Hall response of topologically trivial mobile impurities (Fermi polarons) interacting weakly with majority fermions forming a Chern-insulator background. This setting involves a rich interplay between the genuine many-body character of the polaron problem and the topological nature of the surrounding cloud.
Pimenov, D. +5 more
openaire +6 more sources
Suppression of anomalous impurity transport in NBI-heated W7-X plasmas
Nuclear Fusion, 2023 Radial impurity density profiles in two Wendelstein 7-X (W7-X) experiments heated by neutral beam injection (NBI) are analyzed with respect to their impurity transport properties.
T. Romba +6 more
doaj +1 more source
Nuclear Fusion, 2023 The standard neoclassical theory of the impurity transport in tokamak plasma is improved by including the plasma elongation effect. The neoclassical up/down asymmetry of the impurity density is largely enhanced by the plasma elongation and is under ...
Chengkang Pan
doaj +1 more source
Pfirsch–Schlüter impurity transport in stellarators [PDF]
Physics of Plasmas, 2010 The Pfirsch–Schluter transport of impurities is calculated for stellarator geometry. Contrary to the tokamak case, where the only contribution to the particle flux arises from friction between different species, in a stellarator there is another source of impurity transport due to pressure anisotropy.
Braun, S., Helander, P.
openaire +3 more sources
Observation of tearing mode triggering by sawtooth crash with high-Z impurity accumulation in EAST
AIP Advances, 2023 The high-Z impurity accumulation in the plasma core could degrade the plasma performance and may affect sawtooth crash and trigger tearing modes (TMs) in experimental advanced superconducting tokamak (EAST).
Shanshan Pan +11 more
doaj +1 more source
Nuclear Fusion, 2023 We assess the turbulent particle transport being responsible for the limitation of the confinement and, thus, the overall performance of the neoclassically optimized stellarator Wendelstein 7-X.
J.A. Alcusón +15 more
doaj +1 more source
OEDGE modeling of far-SOL tungsten impurity sources and screening in WEST
Nuclear Materials and Energy, 2022 The plasma background and impurity transport in the scrape-off layer (SOL) of the WEST tokamak are modeled for three discharges over a Psep power scan ranging between 1.5 and 2.35 MW. An extended modeling grid is used to investigate far-SOL sourcing from
J.B. Maeker +10 more
doaj +1 more source
Impurity and Trace Tritium Transport in Tokamak Edge Turbulence [PDF]
, 2004 The turbulent transport of impurity or minority species, as for example Tritium, is investigated in drift-Alfv\'en edge turbulence. The full effects of perpendicular and parallel convection are kept for the impurity species. The impurity density develops
M. E. Perry +3 more
core +1 more source