9.4 Hot Electron Confinement in a Cusped Magnetic Field by ECRH Wrapping

1970 ◽  
Author(s):  
S. Aihara ◽  
M. Fujiwara ◽  
M. Hosokawa ◽  
H. Ikegami ◽  
Hugh C. Wolfe ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hot Electron ◽  
Electron Confinement

scholarly journals Beltrami fields in a hot electron–positron–ion plasma

2012 ◽  
Vol 78 (3) ◽  
pp. 207-210 ◽  
Author(s):  
M. IQBAL ◽  
P. K. SHUKLA
Keyword(s):  
Magnetic Field ◽  
Plasma Flow ◽  
Strong Interaction ◽  
Field Configuration ◽  
Hot Electron ◽  
Magnetic Field Configuration ◽  
Beltrami Fields ◽  
Ion Plasma ◽  
Electron Positron ◽  
Laboratory Plasmas

AbstractA possibility of relaxation of relativistically hot electron and positron (e − p) plasma with a small fraction of hot or cold ions has been investigated analytically. It is observed that a strong interaction of plasma flow and field leads to a non-force-free relaxed magnetic field configuration governed by the triple curl Beltrami (TCB) equation. The triple curl Beltrami (TCB) field composed of three different Beltrami fields gives rise to three multiscale relaxed structures. The results may have the strong relevance to some astrophysical and laboratory plasmas.

scholarly journals Generation of focusing ion beams by magnetized electron sheath acceleration

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
K. Weichman ◽  
J. J. Santos ◽  
S. Fujioka ◽  
T. Toncian ◽  
A. V. Arefiev
Keyword(s):  
Magnetic Field ◽  
High Energy ◽  
Ion Source ◽  
High Energy Density ◽  
Ion Acceleration ◽  
Acceleration Process ◽  
Hot Electron ◽  
Magnetic Field Effects ◽  
Multiple Species ◽  
2D And 3D

Abstract We present the first 3D fully kinetic simulations of laser driven sheath-based ion acceleration with a kilotesla-level applied magnetic field. The application of a strong magnetic field significantly and beneficially alters sheath based ion acceleration and creates two distinct stages in the acceleration process associated with the time-evolving magnetization of the hot electron sheath. The first stage delivers dramatically enhanced acceleration, and the second reverses the typical outward-directed topology of the sheath electric field into a focusing configuration. The net result is a focusing, magnetic field-directed ion source of multiple species with strongly enhanced energy and number. The predicted improvements in ion source characteristics are desirable for applications and suggest a route to experimentally confirm magnetization-related effects in the high energy density regime. We additionally perform a comparison between 2D and 3D simulation geometry, on which basis we predict the feasibility of observing magnetic field effects under experimentally relevant conditions.

Effect of spatially uniform external periodic magnetic field on wave propagation through a hot electron plasma

1971 ◽  
Vol 5 (2) ◽  
pp. 151-159 ◽  
Author(s):  
K. P. Das
Keyword(s):  
Magnetic Field ◽  
Wave Propagation ◽  
Dispersion Relation ◽  
Electron Plasma ◽  
Hydrodynamic Equations ◽  
Hot Electron ◽  
Periodic Magnetic Field ◽  
Excitation Conditions

Starting from hydrodynamic equations, a dispersion relation is obtained for wave propagation through a hot electron plasma perpendicular to a spatially uniform external periodic magnetic field, B0 cos ω0t, and several excitation conditions are deduced.

Effects of the Hot Electron Interchange Instability on Plasma Confined in a Dipolar Magnetic Field

2007 ◽  
Vol 26 (1-2) ◽  
pp. 139-144 ◽  
Author(s):  
E. E. Ortiz ◽  
A. C. Boxer ◽  
J. L. Ellsworth ◽  
D. T. Garnier ◽  
A. K. Hansen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hot Electron ◽  
Interchange Instability

scholarly journals Simulation study on parametric dependence of whistler-mode hiss generation in the plasmasphere

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Yin Liu ◽  
Yoshiharu Omura ◽  
Mitsuru Hikishima
Keyword(s):  
Magnetic Field ◽  
Electron Density ◽  
Nonlinear Process ◽  
Background Field ◽  
Realistic Model ◽  
Equatorial Region ◽  
Generation Process ◽  
Hot Electron ◽  
Wave Growth ◽  
Background Magnetic Field

AbstractWe conduct electromagnetic particle simulations to examine the applicability of nonlinear wave growth theory to the generation process of plasmaspheric hiss. We firstly vary the gradient of the background magnetic field from a realistic model to a rather steep gradient model. Under such variation, the threshold amplitude in the nonlinear theory increases quickly and the overlap between threshold and optimum amplitude disappears correspondingly, the nonlinear process is suppressed. In the simulations, as we enlarge the gradient coefficient of the background magnetic field, waves generated near the equator do not grow through propagation. By examining the range of suitable values of inhomogeneity factor S (i.e., $$|S|<2$$ | S | < 2 ), we find the generation of wave packets is limited to the equatorial region when the background field is steep, showing a good agreement with what is indicated by critical distance in the theory. We then check the dependence of generation of hiss emissions on different hot electron densities. Since the overlap between threshold and optimum amplitude vanishes, the nonlinear process is weakened when hot electron density becomes smaller. In the simulation results, we find similar wave structures in all density cases, yet with different magnitudes. The existence of suitable S values implies that the nonlinear process occurs even at a low level of hot electron density. However, by examining $$J_E$$ J E that closely relates to the wave growth, we find energy conveyed from particles to waves is much limited in small density cases. Therefore, the nonlinear process is suppressed when hot electron density is small, which agrees with the theoretical analysis. Graphical Abstract

scholarly journals Collimation of hot electron beams by external field from magnetic-flux compression

2013 ◽  
Vol 31 (4) ◽  
pp. 579-582 ◽  
Author(s):  
Yuqiu Gu ◽  
Jinqing Yu ◽  
Weimin Zhou ◽  
Fengjuan Wu ◽  
Jian Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electron Beam ◽  
External Magnetic Field ◽  
Magnetic Flux ◽  
External Field ◽  
Fast Ignition ◽  
Hot Electrons ◽  
Hot Electron ◽  
Flux Compression ◽  
Magnetic Flux Compression

AbstractIn fast ignition of inertial confinement fusion, hot electron beam is considered to be an appropriate energy source for ignition. However, hot electrons are divergent as they are transporting in over-dense plasma. So collimating the hot electrons becomes one of the most important issues in fast ignition. A method to collimate hot electron beam by external magnetic field is proposed in this paper. The external field can be generated by compressing a seed magnetic field at the stage of laser-driven implosion. This method is confirmed by particle-in-cell simulations. The results show that hot electrons are well collimated by external magnetic field from magnetic-flux compression.

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