scholarly journals Magnetization of Rydberg plasmas by electromagnetic waves

2009 ◽  
Vol 76 (1) ◽  
pp. 19-23 ◽  
Author(s):  
J. T. MENDONÇA ◽  
NITIN SHUKLA ◽  
P. K. SHUKLA
Keyword(s):  
Electromagnetic Wave ◽  
Magnetic Fields ◽  
High Frequency ◽  
Large Amplitude ◽  
Electromagnetic Waves ◽  
Ponderomotive Force

AbstractIt is shown that the ponderomotive force of a large-amplitude electromagnetic wave in Rydberg plasmas can generate quasi-stationary magnetic fields. The present result can account for the origin of seed magnetic fields in the ultracold Rydberg plasmas when they are irradiated by the high-frequency electromagnetic wave.

scholarly journals Generation of magnetic fields by the ponderomotive force of electromagnetic waves in dense plasmas

2009 ◽  
Vol 76 (1) ◽  
pp. 25-28 ◽  
Author(s):  
P. K. SHUKLA ◽  
NITIN SHUKLA ◽  
L. STENFLO
Keyword(s):  
Electromagnetic Wave ◽  
Magnetic Fields ◽  
Electromagnetic Waves ◽  
Ponderomotive Force ◽  
Intense Laser ◽  
Quantum Plasma ◽  
Dense Plasmas ◽  
Solid Density ◽  
Astrophysical Objects ◽  
Density Plasma

AbstractWe show that the non-stationary ponderomotive force of a large-amplitude electromagnetic wave in a very dense quantum plasma with streaming degenerate electrons can spontaneously create d.c. magnetic fields. The present result can account for the seed magnetic fields in compact astrophysical objects and in the next-generation intense laser–solid density plasma interaction experiments.

scholarly journals Excitation of ion wakefields by electromagnetic pulses in dense plasmas

2009 ◽  
Vol 75 (1) ◽  
pp. 15-18 ◽  
Author(s):  
P. K. SHUKLA
Keyword(s):  
Wave Equation ◽  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Electromagnetic Pulse ◽  
Dense Plasma ◽  
Ponderomotive Force ◽  
Electromagnetic Pulses ◽  
Dense Plasmas ◽  
High Energies

AbstractThe excitation of electrostatic ion wakefields by electromagnetic pulses in a very dense plasma is considered. For this purpose, a wave equation for the ion wakefield in the presence of the ponderomotive force of the electromagnetic waves is obtained. Choosing a typical profile for the electromagnetic pulse, the form of the ion wakefields is deduced. The electromagnetic wave-generated ion wakefields can trap protons and accelerate them to high energies in dense plasmas.

Theory of stimulated scattering of large-amplitude waves

2000 ◽  
Vol 64 (4) ◽  
pp. 353-357 ◽  
Author(s):  
L. STENFLO ◽  
P. K. SHUKLA
Keyword(s):  
Growth Rates ◽  
High Frequency ◽  
Large Amplitude ◽  
Electromagnetic Waves ◽  
Long Term Evolution ◽  
Stimulated Scattering ◽  
Term Evolution ◽  
Laboratory Plasmas ◽  
General Dispersion

Comprehensive comments on the theory of stimulated scattering instabilities of high-frequency electromagnetic waves in magnetized plasmas are presented. It is shown that our general dispersion relations are appropriate for deducing valuable information regarding the growth rates of scattering instabilities and the long-term evolution of modulationally unstable waves in space and laboratory plasmas as well as in astrophysical settings.

A comparison between electron orbits for both an axial magnetic field and an ion-channel guiding in a FEL with an electromagnetic wave wiggler

2008 ◽  
Vol 74 (2) ◽  
pp. 187-196 ◽  
Author(s):  
H. MEHDIAN ◽  
S. JAFARI
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Ion Channel ◽  
Free Electron ◽  
Free Electron Laser ◽  
Large Amplitude ◽  
Electromagnetic Waves ◽  
Axial Magnetic Field ◽  
Numerical Study ◽  
Guide Magnetic Field

AbstractThe operation of a free-electron laser (FEL) with electromagnetic wave wiggler in the presence of an ion-channel guiding as well as an axial guide magnetic field is considered and compared. Theoretical studies of electron trajectories and dispersion relations in a combined ion electrostatic field as well as large-amplitude backward-propagating electromagnetic waves are analyzed. The large-amplitude wave acts like a magnetostatic wiggler in a FEL. The results of a numerical study are presented and discussed. It is shown that in the wiggler pumped ion-channel free-electron laser (WPIC-FEL), electron orbits and dispersion relation are time-dependent, and over time, electron orbits while oscillating bear a periodic motion.

Weak nonlinear electromagnetic waves and low-frequency magnetic-field generation in electron-positron-ion plasmas

1988 ◽  
Vol 40 (2) ◽  
pp. 289-298 ◽  
Author(s):  
F. B. Rizzato
Keyword(s):  
Magnetic Fields ◽  
High Frequency ◽  
Electromagnetic Waves ◽  
Low Frequency ◽  
Spontaneous Generation ◽  
Magnetic Field Generation ◽  
Frequency Wave ◽  
Weakly Nonlinear ◽  
Nonlinear Localization ◽  
Electron Positron

The weakly nonlinear localization of obliquely modulated high-frequency electromagnetic waves in an electron-positron-ion plasma is considered. It is shown that the amplitude of the wave turns out to be a strongly dependent function of the angle between the slow modulations and the fast spatial variations and that the possibility appears of spontaneous generation of low-frequency magnetic fields. These magnetic fields are also functions of this angle and of the high-frequency wave polarization. The analysis of colinear modulation in electron-positron plasmas shows that some restriction must be made regarding the validity of previous calculations.

Stimulated scattering of electromagnetic waves by magnetosonic modes in a plasma

1985 ◽  
Vol 34 (1) ◽  
pp. 95-102 ◽  
Author(s):  
L. Stenflo
Keyword(s):  
Electromagnetic Wave ◽  
Dispersion Relation ◽  
High Frequency ◽  
Electromagnetic Waves ◽  
Stimulated Scattering

The dispersion relation for magnetosonic waves in a dissipative plasma, which is penetrated by a high-frequency electromagnetic wave, is derived. Previous results are generalized and discussed.

Characteristics Simulation of Ultra-High Frequency Electromagnetic Wave Excited by Equivalent Partical Discharge Mathematical Model in GIS

2014 ◽  
Vol 1070-1072 ◽  
pp. 1138-1143
Author(s):  
Guang Ke Xu ◽  
Wei Wei Zhang ◽  
Zhen Hua Zhu ◽  
Nan Wang ◽  
Fu Qiang Zhao
Keyword(s):  
Mathematical Model ◽  
Electromagnetic Wave ◽  
Frequency Domain ◽  
Time Domain ◽  
High Frequency ◽  
Electromagnetic Waves ◽  
Fdtd Method ◽  
Propagation Characteristics ◽  
Ultra High Frequency ◽  
Actual Measure

UHF electromagnetic waves radiated by PD in GIS can range from several hundreds of MHz to several GHz. FDTD method is usually used to simulate the characteristics of the UHF electromagnetic waves. Compared with the traditional ideal Gaussian pulses in simulation, one equivalent PD mathematical model based on the actual measure PD sources was considered to simulate the propagation characteristics. Time domain and frequency domain spectrum of signals excited by the two PD sources were studied to analyze the propagation characteristics. It can draw the conclusions that each insulator detect leads to each electromagnetic and its time domain and frequency domain spectrum. So it is recommended to use equivalent PD mathematical model to simulator the propagation characteristics.

scholarly journals Numerical study of upper hybrid to <i>Z</i>-mode leakage during electromagnetic pumping of groups of striations in the ionosphere

2015 ◽  
Vol 33 (8) ◽  
pp. 1019-1030 ◽  
Author(s):  
B. Eliasson ◽  
T. B. Leyser
Keyword(s):  
High Frequency ◽  
Large Amplitude ◽  
Electromagnetic Waves ◽  
Ionospheric Plasma ◽  
Numerical Study ◽  
Lower Hybrid ◽  
Loss Mechanism ◽  
Circularly Polarized ◽  
Left Hand ◽  
Mode Wave

Abstract. We investigate numerically the interaction between ionospheric magnetic field-aligned density striations and a left-hand circularly polarized (L)-mode wave. The L-mode wave is scattered into upper hybrid (UH) waves which are partially trapped in the striations, but leak energy to electromagnetic waves in the Z-mode branch. For small-amplitude (1 %) striations, this loss mechanism leads to a significant reduction in amplitude of the UH waves. For several striations organized in a lattice, the leaking of Z-mode waves is compensated by influx of Z-mode radiation from neighboring striations, leading to an increased amplitude of the weakly trapped UH waves. For large-amplitude (10 %) striations the trapped UH waves rapidly increase in amplitude far beyond the threshold for parametric instabilities, and the Z-mode leakage is less important. The results have relevance for the growth of striations and the onset of UH and lower hybrid turbulence during electromagnetic high-frequency pumping of ionospheric plasma, which require large-amplitude UH waves.

Kinetic theory of transverse plasmons in pair plasmas

2010 ◽  
Vol 77 (2) ◽  
pp. 145-153 ◽  
Author(s):  
S. Q. LIU ◽  
Y. LIU
Keyword(s):  
High Frequency ◽  
Electromagnetic Waves ◽  
Maxwell Equations ◽  
Ponderomotive Force ◽  
Nonlinear Propagation ◽  
Governing Equations ◽  
Filamentary Structure ◽  
Wave Fields ◽  
Propagation Behavior ◽  
Spatially Inhomogeneous

AbstractA set of nonlinear governing equations for interactions of transverse plasmons with pair plasmas is derived from Vlasov–Maxwell equations. It is shown the ponderomotive force induced by high-frequency transverse plasmons will expel the pair particles away, resulting in the formation of density cavity in which transverse plasmons are trapped. Numerical results show the envelope of wave fields will collapse and break into a filamentary structure due to the spatially inhomogeneous growth rate. The results obtained would be useful for understanding the nonlinear propagation behavior of intense electromagnetic waves in pair plasmas.

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