Improved neoclassical plasma confinement and turbulence suppression in a magnetic well in tokamak reactors

2021 ◽  
Vol 61 (9) ◽  
pp. 096031
Author(s):  
K.C. Shaing ◽  
M.S. Chu ◽  
Y.-K.M. Peng
Keyword(s):  
Plasma Confinement ◽  
Turbulence Suppression ◽  
Tokamak Reactors ◽  
Magnetic Well

A Helical Field Configuration for Plasma Confinement with a Very Deep Magnetic Well

1977 ◽  
Vol 42 (3) ◽  
pp. 1075-1076 ◽  
Author(s):  
Shigeo Nagao ◽  
Hiroshi Chishima ◽  
Norihiko Sasaki
Keyword(s):  
Field Configuration ◽  
Plasma Confinement ◽  
Magnetic Well ◽  
Helical Field

Enhanced plasma confinement in a magnetic well by whistler waves

1981 ◽  
Vol 84 (2) ◽  
pp. 65-67
Author(s):  
A.A. Balmashnov ◽  
J.Juul Rasmussen
Keyword(s):  
Plasma Confinement ◽  
Whistler Waves ◽  
Magnetic Well

JETTO simulations ofTe/Tieffects on plasma confinement

2005 ◽  
Vol 47 (3) ◽  
pp. 505-519 ◽  
Author(s):  
E Asp ◽  
J Weiland ◽  
X Garbet ◽  
P Mantica ◽  
V Parail ◽  
...  
Keyword(s):  
Plasma Confinement

scholarly journals Enhanced X-ray emission arising from laser-plasma confinement by a strong transverse magnetic field

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Evgeny D. Filippov ◽  
Sergey S. Makarov ◽  
Konstantin F. Burdonov ◽  
Weipeng Yao ◽  
Guilhem Revet ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transverse Magnetic ◽  
Radiative Properties ◽  
Magnetic Field Direction ◽  
Solid Target ◽  
Total Plasma ◽  
Plasma Confinement ◽  
X Ray ◽  
Magnetic Compression ◽  
The Magnetic Field

AbstractWe analyze, using experiments and 3D MHD numerical simulations, the dynamic and radiative properties of a plasma ablated by a laser (1 ns, 10$$^{12}$$ 12 –10$$^{13}$$ 13 W/cm$$^2$$ 2 ) from a solid target as it expands into a homogeneous, strong magnetic field (up to 30 T) that is transverse to its main expansion axis. We find that as early as 2 ns after the start of the expansion, the plasma becomes constrained by the magnetic field. As the magnetic field strength is increased, more plasma is confined close to the target and is heated by magnetic compression. We also observe that after $$\sim 8$$ ∼ 8  ns, the plasma is being overall shaped in a slab, with the plasma being compressed perpendicularly to the magnetic field, and being extended along the magnetic field direction. This dense slab rapidly expands into vacuum; however, it contains only $$\sim 2\%$$ ∼ 2 % of the total plasma. As a result of the higher density and increased heating of the plasma confined against the laser-irradiated solid target, there is a net enhancement of the total X-ray emissivity induced by the magnetization.

scholarly journals The on-axis magnetic well and Mercier's criterion for arbitrary stellarator geometries

2021 ◽  
Vol 87 (2) ◽  
Author(s):  
P. Kim ◽  
R. Jorge ◽  
W. Dorland
Keyword(s):  
Magnetic Field ◽  
Original Work ◽  
Three Dimensional ◽  
Radial Distance ◽  
Analytical Form ◽  
One Dimensional ◽  
Modern Notation ◽  
Magnetic Well ◽  
First Time ◽  
Dimensional Integral

A simplified analytical form of the on-axis magnetic well and Mercier's criterion for interchange instabilities for arbitrary three-dimensional magnetic field geometries is derived. For this purpose, a near-axis expansion based on a direct coordinate approach is used by expressing the toroidal magnetic flux in terms of powers of the radial distance to the magnetic axis. For the first time, the magnetic well and Mercier's criterion are then written as a one-dimensional integral with respect to the axis arclength. When compared with the original work of Mercier, the derivation here is presented using modern notation and in a more streamlined manner that highlights essential steps. Finally, these expressions are verified numerically using several quasisymmetric and non-quasisymmetric stellarator configurations including Wendelstein 7-X.

scholarly journals Experimental study of water droplet break up in water in oil dispersions using an apparatus that produces localized pressure drops

2019 ◽  
Vol 74 ◽  
pp. 1 ◽  
Author(s):  
Fabricio S. Silva ◽  
Ricardo A. Medronho ◽  
Luiz Fernando Barca
Keyword(s):  
Experimental Study ◽  
Droplet Size Distribution ◽  
Energy Dissipation Rate ◽  
Experimental Results ◽  
Good Prediction ◽  
Pressure Drops ◽  
Turbulence Suppression ◽  
Kolmogorov Length Scale ◽  
Control Production ◽  
Break Up

Oil production facilities have choke/control valves to control production and protect downstream equipment against over pressurization. This process is responsible for droplets break up and the formation of emulsions which are difficult to treat. An experimental study of water in oil dispersion droplets break up in localized pressure drop is presented. To accomplish that, an apparatus simulating a gate valve was constructed. Droplet Size Distribution (DSD) was measured by laser light scattering. Oil physical properties were controlled and three different break up models were compared with the experimental results. All experimental maximum diameters (dmax) were above Kolmogorov length scale. The results show that dmax decreases with increase of energy dissipation rate (ε) according to the relation dmax ∝ ε−0.42. The Hinze (1955, AIChE J.1, 3, 289–295) model failed to predict the experimental results, although, it was able to adjust reasonably well those points when the original proportional constant was changed. It was observed that increasing the dispersed phase concentration increases dmax due to turbulence suppression and/or coalescence phenomenon. Turbulent viscous break up model gave fairly good prediction.

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