Ponderomotive force in a nonisothermal plasma

1988 ◽  
Vol 31 (1) ◽  
pp. 90-94 ◽  
Author(s):  
Nam C. Lee ◽  
George K. Parks
Keyword(s):  
Ponderomotive Force ◽  
Nonisothermal Plasma

New method to improve He-removal performance of pump limiter by RF ponderomotive force

1995 ◽  
Vol 220-222 ◽  
pp. 483-487 ◽  
Author(s):  
T. Shoji ◽  
Y. Sakawa ◽  
K. Tsuji ◽  
T. Watari ◽  
K.H. Finken
Keyword(s):  
Ponderomotive Force ◽  
New Method

Alternative Laser Driven Fusion Reactions for Nuclear Energy Without Radioactivity

2010 ◽  
Author(s):  
Mahmoud Ghoranneviss ◽  
Babak Malekynia ◽  
Nader Azizi ◽  
Henrich Hora ◽  
George H. Miley
Keyword(s):  
Nuclear Energy ◽  
Ponderomotive Force ◽  
Fusion Energy ◽  
Contrast Ratio ◽  
Laser Pulses ◽  
State Density ◽  
Helium Isotope ◽  
Fusion Reactions ◽  
Solid Density ◽  
Radioactive Radiation

Following the first result of generating nuclear fusion energy without dangerous radioactive radiation by laser ignition of the proton-11Boron reaction (HB11), we applied this method to evaluate other fusion reactions with no primary neutron production as the proton-7Lithium reaction (HLi7) and of the burning of solid density helium isotope 3He (He3-He3). The new method is a combination of now available laser pulses of 10 petawatt (PW) power and duration in the range of picoseconds (ps) or less. The new mechanism follows the initial theory of Chu and of Bobin for side-on ignition of solid state density fusion fuel developed in about 1972 where some later known physics phenomena had to be added. The essential innovation is the use of the discovery of a predicted anomaly when the mentioned laser pulses are sufficiently clean, i.e. free from prepulses by at least a contrast ratio 108 where acceleration by the nonlinear (ponderomotive) force is dominating.

scholarly journals Single-particle motion under the influence of the perpendicular ponderomotive force

1987 ◽  
Vol 37 (3) ◽  
pp. 497-506
Author(s):  
M. C. Festeau-Barrioz ◽  
M. L. Sawley ◽  
J. Václavík
Keyword(s):  
Electromagnetic Field ◽  
Single Particle ◽  
Particle Motion ◽  
Ponderomotive Force ◽  
Equation Of Motion ◽  
Exact Equation ◽  
Particle Theory ◽  
Magnetostatic Field ◽  
Single Particle Motion

The motion of a single particle under the influence of the ponderomotive force directed perpendicular to the external magnetostatic field is analysed. By solving the exact equation of motion for a specific applied electromagnetic field, the resultant ponderomotive drift is compared with the prediction of a single-particle theory using the oscillation-centre approximation. The regime of validity of this theory is discussed. It is shown that, for certain values of the amplitude and frequency of the electromagnetic field, the particle motion is unstable and therefore the concept of a single-particle ponderomotive force is meaningless.

Slowing-down of the velocity of an ion wave in a nonisothermal plasma

1970 ◽  
Vol 4 (15) ◽  
pp. 685-688 ◽  
Author(s):  
S. Takamura ◽  
S. Aihara
Keyword(s):  
Slowing Down ◽  
Nonisothermal Plasma

The effect of microscale random Alfvén waves on the propagation of large-scale Alfvén waves

1983 ◽  
Vol 29 (2) ◽  
pp. 243-253 ◽  
Author(s):  
Tomikazu Namikawa ◽  
Hiromitsu Hamabata
Keyword(s):  
Large Scale ◽  
Ponderomotive Force ◽  
Collisionless Plasma ◽  
Alfven Waves ◽  
Velocity Fields ◽  
Velocity Shear ◽  
Alfvén Waves ◽  
Spectrum Function ◽  
Spatial Derivatives ◽  
Derivatives Of

The ponderomotive force generated by random Alfvén waves in a collisionless plasma is evaluated taking into account mean magnetic and velocity shear and is expressed as a series involving spatial derivatives of mean magnetic and velocity fields whose coefficients are associated with the helicity spectrum function of random velocity field. The effect of microscale random Alfvén waves through ponderomotive and mean electromotive forces generated by them on the propagation of large-scale Alfvén waves is also investigated.

scholarly journals Magnetic Decreases (MDs) and mirror modes: two different plasma β changing mechanisms

2010 ◽  
Vol 17 (5) ◽  
pp. 467-479 ◽  
Author(s):  
B. T. Tsurutani ◽  
G. S. Lakhina ◽  
O. P. Verkhoglyadova ◽  
E. Echer ◽  
F. L. Guarnieri
Keyword(s):  
Free Energy ◽  
Energetic Particle ◽  
Ponderomotive Force ◽  
Interplanetary Space ◽  
The Other ◽  
Characteristic Scale ◽  
Physical Processes ◽  
Scale Size ◽  
Mirror Mode ◽  
Energetic Particle Transport

Abstract. We discuss two different physical processes that create localized high β plasma regions. One is nonlinear wave-steepening, generating magnetic decreases (MDs) by a ponderomotive force. The other is the mirror instability generating alternating high and low β plasma regions. It is demonstrated that MDs and mirror modes are observationally quite different structures. MDs spatially occur in interplanetary space and mirror modes primarily in planetary magnetosheaths. MDs are characterized by: 1) variable (exponentially decreasing number with increasing) angular changes, 2) variable (exponentially decreasing) thicknesses, and 3) no characteristic inter-event spacings. In sharp contrast, mirror modes are characterized by: 1) little or no angular changes across the structures, 2) a characteristic scale size, and 3) are quasiperiodic in nature. Arguments are presented for the recently observed magnetic dips in the heliosheath being mirror mode structures. The sources of free energy for instability are discussed. Both structures are important for energetic particle transport in astrophysical and heliospheric plasmas.

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