Second harmonic electromagnetic emission via Langmuir wave coalescence

1996 ◽  
Vol 3 (1) ◽  
pp. 149-159 ◽  
Author(s):  
A. J. Willes ◽  
P. A. Robinson ◽  
D. B. Melrose
Keyword(s):  
Second Harmonic ◽  
Langmuir Wave ◽  
Electromagnetic Emission

Second harmonic electromagnetic emission via beam-driven Langmuir waves

2005 ◽  
Vol 12 (1) ◽  
pp. 012103-012103-15 ◽  
Author(s):  
B. Li ◽  
A. J. Willes ◽  
P. A. Robinson ◽  
I. H. Cairns
Keyword(s):  
Second Harmonic ◽  
Electromagnetic Emission ◽  
Langmuir Waves

scholarly journals Numerical studies on terahertz radiation generated from two-color laser pulse interaction with gas targets

2011 ◽  
Vol 29 (4) ◽  
pp. 447-452 ◽  
Author(s):  
H.W. Du ◽  
M. Chen ◽  
Z.M. Sheng ◽  
J. Zhang
Keyword(s):  
Intensity Ratio ◽  
Second Harmonic ◽  
Electromagnetic Emission ◽  
Current Theory ◽  
Particle In Cell ◽  
Neutral Gas ◽  
Ionization Model ◽  
The Difference ◽  
Gas Targets ◽  
Proper Values

AbstractBased upon the Ammosov-Delone-Krainov ionization model, it is shown that two-color laser interaction with neutral gas generates strong ionization currents, which lead to electromagnetic emission at terahertz frequency when the gas density is at proper values. The emission efficiency depends on the difference of the phases between the fundamental and its second harmonic. The intensity ratio between the two pulses also affects the emission strength. An optimum intensity ratio has been found within our parameter region. The above ionization current theory is in agreement with one-dimensional particle-in-cell simulations with field ionization included.

scholarly journals Electromagnetic emission by subsequent processes L→L'+S and L+L'→T

2010 ◽  
Vol 6 (S274) ◽  
pp. 252-254 ◽  
Author(s):  
Marian Karlický ◽  
Miroslav Bárta
Keyword(s):  
Plasma Frequency ◽  
Langmuir Wave ◽  
Electromagnetic Emission ◽  
Small Region ◽  
Analytical Analysis ◽  
Particle In Cell ◽  
Early Stages

AbstractUsing a 2.5-D electromagnetic particle-in-cell (PIC) model, very early stages of a generation of the electromagnetic emission produced by a monochromatic Langmuir wave are studied. It is found that the electromagnetic emission, which is dominant on the harmonic of the plasma frequency, starts to be generated in a very small region of k-vectors. Later on the k-vectors of this emission are scattered around a ‘circle’ (in our 2-D case), given by the relations for the L+L'→T process. Analytical analysis of two subsequent processes L→L'+S a L+L'→T confirms these results.

scholarly journals Second harmonic electromagnetic emission in a beam-driven plasma antenna

2019 ◽  
Vol 61 (5) ◽  
pp. 055005 ◽  
Author(s):  
V V Annenkov ◽  
E A Berendeev ◽  
E P Volchok ◽  
I V Timofeev
Keyword(s):  
Second Harmonic ◽  
Electromagnetic Emission ◽  
Plasma Antenna

Experimental investigations of second‐harmonic spectra and Langmuir wave collapse

1991 ◽  
Vol 3 (9) ◽  
pp. 2558-2567 ◽  
Author(s):  
Faiz Dahmani ◽  
Djamel Ghobrini ◽  
Malek EL‐Mahdaoui
Keyword(s):  
Second Harmonic ◽  
Langmuir Wave ◽  
Experimental Investigations ◽  
Wave Collapse

scholarly journals Large-Scale Structure and Termination of the Heliosphere

1998 ◽  
Vol 11 (2) ◽  
pp. 851-856 ◽  
Author(s):  
W. M. Macek
Keyword(s):  
Solar Wind ◽  
Large Scale ◽  
Second Harmonic ◽  
Source Region ◽  
Langmuir Wave ◽  
Solar Wind Plasma ◽  
Langmuir Waves ◽  
Post Shock ◽  
Wind Intensity

AbstractThe question of the boundaries of the heliosphere is considered. The termination heliospheric shock should exist because the solar wind plasma flowing supersonically away from the Sun must make a transition to a subsonic flow. The heliopause is at the outermost extend of the solar wind. Beyond the heliopause lies the (very local) interstellar wind. Intensity of radio emissions at 2 to 3 kHz detected by the Voyager plasma wave instrument in the outer heliosphere can be explained provided that the electron beams generating Langmuir waves exist in the post-shock plasma due to secondary shocks in the compressed solar wind beyond the termination shock. The field strengths of Langmuir waves required to generate the second harmonic emissions are 50 – 100 μ V m-1. Alternatively, the emissions are generated in the vicinity of the heliopause. The Voyager 1 and 2 are proceeding toward a likely source region for Langmuir wave and these waves may be observed in situ in the near future.

scholarly journals Full-scale simulation study of stimulated electromagnetic emissions: The first ten milliseconds

2010 ◽  
Vol 76 (3-4) ◽  
pp. 369-375 ◽  
Author(s):  
BENGT ELIASSON ◽  
LENNART STENFLO
Keyword(s):  
Numerical Study ◽  
Langmuir Wave ◽  
Electromagnetic Emission ◽  
Full Scale ◽  
Frequency Spectra ◽  
Ion Density ◽  
Turbulent Layer ◽  
Radio Transmitter ◽  
Electromagnetic Emissions ◽  
Frequency Components

AbstractA full-scale numerical study is performed of the nonlinear interaction between a large-amplitude electromagnetic wave and the Earth's ionosphere, and of the stimulated electromagnetic emission emerging from the turbulent layer, during the first 10 milliseconds after switch-on of the radio transmitter. The frequency spectra are downshifted in frequency and appear to emerge from a region somewhat below the cutoff of the O mode, which is characterized by Langmuir wave turbulence and localized Langmuir envelopes trapped in ion density cavities. The spectral features of escaping O-mode waves are very similar to those observed in experiments. The frequency components of Z-mode waves, trapped in the region between the O- and Z-mode cutoffs show strongly asymmetric and downshifted spectra.

scholarly journals Dynamic process of the second harmonic emission in laser produced plasmas

1988 ◽  
Vol 6 (3) ◽  
pp. 569-577 ◽  
Author(s):  
Gu Min ◽  
Tan Weihan
Keyword(s):  
Kinetic Equation ◽  
Fourier Analysis ◽  
Laser Plasma ◽  
Dynamic Process ◽  
Second Harmonic ◽  
Wave Spectrum ◽  
Langmuir Wave ◽  
Harmonic Spectrum ◽  
Harmonic Emission ◽  
First Time

In terms of energy conservation and vector matching relations, the dynamic process of the second harmonic emission from a laser plasma has been analyzed in this article for the first time. Then, considering the Langmuir wave spectrum which reflects the second harmonic spectrum, we derive the kinetic equation of the Langmuir wave. After a numerical Fourier analysis, the spectrum profiles are obtained, which coincide well with the experiments.

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