Results 71 to 80 of about 2,547,829 (287)

Evaluation of neoclassical transport in nearly quasi-isodynamic stellarator magnetic fields using MONKES

Nuclear Fusion
Stellarator magnetic fields that are perfectly optimized for neoclassical transport (with levels of radial neoclassical transport comparable to tokamaks) are called omnigenous.
F.J. Escoto, J.L. Velasco, I. Calvo, E. Sánchez   +3 more
doaj   +1 more source

Edge Fluid Turbulence Simulations of Stellarators With GRILLIX

Contributions to Plasma Physics, EarlyView.
ABSTRACT The edge fluid turbulence code GRILLIX has recently been extended from axisymmetric tokamak geometries to support 3D stellarator configurations. Following successful proof‐of‐principle simulations published in Stegmeir et al., we present here a comprehensive simulation of the Wendelstein 7‐AS stellarator.
Andreas Stegmeir, Christoph Pitzal, Barnabas Csillag, Miguel Madeira, Marion Finkbeiner   +4 more
wiley   +1 more source

Flux-surface variations of the electrostatic potential in stellarators: impact on the radial electric field and neoclassical impurity transport

Plasma Physics and Controlled Fusion, 2018
Flux-surface variations of the electrostatic potential are typically neglected in standard neoclassical theory, but in 3D devices they can be large enough to affect the radial particle flux of impurities.
A. Mollén, M. Landreman, H. Smith, J. M. García-Regaña, M. Nunami   +4 more
semanticscholar   +1 more source

Heat Load Mitigation Studies in the W7‐X Stellarator Experiment

Contributions to Plasma Physics, EarlyView.
ABSTRACT During the experiments at the stellarator Wendelstein 7‐X (W7‐X) with fully water‐cooled plasma‐facing components (PFC), including carbon‐fiber composite (CFC) divertor targets with a thermal load capability of 10 MW/m2, high performance was achieved.
Dirk Naujoks, Amit Kharwandikar, Jasper Dettmar, Michael Endler, Joris Fellinger, Yu Gao, Joachim Geiger, Marcin Jakubowski, Thomas Sieber, Sebastian Thiede, Christian Voß, W7‐X Team   +11 more
wiley   +1 more source

The effect of magnetic islands on ITG turbulence driven transport

, 2015
In this work, we address the question of the influence of magnetic islands on the perpendicular transport due to steady-state ITG turbulence on the energy transport time scale.
Hariri, F., Hill, P., Ottaviani, M.
core   +1 more source

Direct optimization of neoclassical ion transport in stellarator reactors

Nuclear Fusion
We directly optimize stellarator neoclassical ion transport while holding neoclassical electron transport at a moderate level, creating a scenario favorable for impurity expulsion and retaining good ion confinement.
B.F. Lee, S.A. Lazerson, H.M. Smith, C.D. Beidler, N.A. Pablant   +4 more
doaj   +1 more source

The Bazaar as a Model for Knowledge Work

Knowledge and Process Management, EarlyView.
ABSTRACT This paper presents fieldwork that extends existing metaphors of knowledge work as a process shaped by hierarchical or market forces. A qualitative, ethnographic study of six knowledge‐intensive businesses in two countries identifies striking parallels with the Middle Eastern bazaar in contrast to Western impersonal markets and hierarchies. We
Reed Elliot Nelson, Andrew B. Hargadon, José Osvaldo De Sordi   +2 more
wiley   +1 more source

Theory of the Spatio-Temporal Dynamics of Transport Bifurcations

, 1996
The development and time evolution of a transport barrier in a magnetically confined plasma with non-monotonic, nonlinear dependence of the anomalous flux on mean gradients is analyzed.
Burrell K. H., Lebedev V. B., P. H. Diamond, V. B. Lebedev   +3 more
core   +1 more source

Direct Gyrokinetic Comparison of Pedestal Transport in JET with Carbon and ITER-Like Walls [PDF]

, 2019
This paper compares the gyrokinetic instabilities and transport in two representative JET pedestals, one (pulse 78697) from the JET configuration with a carbon wall (C) and another (pulse 92432) from after the installation of JET's ITER-like Wall (ILW ...
Field, A. R., Giroud, C., Hatch, D. R., Hillesheim, J. C., Kotschenreuther, M., Maggi, C. F., Mahajan, S. M., Merlo, G., Perez von Thun, C., Roach, C. M., Saarelma, S., Subba, F.   +11 more
core   +2 more sources

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 ...
openaire   +3 more sources