Plasma wave propagation with a plasma density gradient

2011 ◽  
Vol 18 (3) ◽  
pp. 034504 ◽  
Author(s):  
Guangsup Cho ◽  
Eun-Ha Choi ◽  
Han Sup Uhm
Keyword(s):  
Wave Propagation ◽  
Density Gradient ◽  
Plasma Wave ◽  
Plasma Density

scholarly journals Electron energy optimization by plasma density ramp in laser wakefield acceleration in bubble regime

2018 ◽  
Vol 36 (2) ◽  
pp. 195-202
Author(s):  
M. Kaur ◽  
D. N. Gupta
Keyword(s):  
Phase Velocity ◽  
Density Gradient ◽  
Plasma Wave ◽  
Plasma Density ◽  
Beam Quality ◽  
Constant Density ◽  
Density Region ◽  
Particle In Cell ◽  
Laser Wakefield ◽  
Bubble Regime

AbstractEnergy gain of electron beams in bubble regime of the laser wakefield accelerator can be optimized by improving the acceleration length, radial accelerating and focusing force, number of monoenergetic electrons trapped inside the bubble, and increasing dephasing length. In order to enlarge the dephasing length, the phase velocity of the plasma wave can be increased by optimizing the plasma density profile. We report the estimation of dephasing length using plasma density distribution with the flat and linear-upward profile using two-dimensional particle-in-cell simulations. The size of wakefield bubble depends on the plasma density. With a positive plasma density gradient, the size of bubble decreases. The front and trail part of wake bubble will have different phase velocity in plasma density gradient region. After density transition in constant density region, the bubble elongates and the velocity of the back part of the bubble increases so that the accelerated electron phase synchronizes with the phase of the plasma wave. In a result, the electron acceleration length enhances to improve the beam quality.

Energy Enhancement of the Self-Modulated Laser Wakefield Acceleration by Using the Plasma Density Gradient

2007 ◽  
Vol 51 (91) ◽  
pp. 402 ◽  
Author(s):  
Seung Hoon Yoo ◽  
Sang June Hahn ◽  
Min Sup Hur ◽  
Hyojae Jang ◽  
Ilmoon Hwang ◽  
...  
Keyword(s):  
Density Gradient ◽  
Plasma Density ◽  
The Self ◽  
Laser Wakefield Acceleration ◽  
Wakefield Acceleration ◽  
Laser Wakefield

scholarly journals Second-harmonic generation by a chirped laser pulse with the exponential density ramp profile in the presence of a planar magnetostatic wiggler

2019 ◽  
Vol 37 (4) ◽  
pp. 442-447 ◽  
Author(s):  
Niti Kant ◽  
Arvinder Singh ◽  
Vishal Thakur
Keyword(s):  
Laser Pulse ◽  
Second Harmonic Generation ◽  
Lorentz Force ◽  
Plasma Wave ◽  
Plasma Density ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Second Order ◽  
Self Focusing ◽  
Chirped Laser Pulse

AbstractSecond-harmonic generation of the relativistic self-focused chirped laser pulse in plasma has been studied with the exponential plasma density ramp profile in the presence of a planar magnetostatic wiggler. It is evident that the exponential plasma density ramp is helpful in enhancing second-harmonic generation as, with the introduction of the exponential plasma density ramp, self-focusing becomes stronger and hence, it leads to enhance the harmonic generation of the second order in the plasma. Also, it is observed that the efficiency of second-harmonic generation enhances significantly with an increase in the value of the chirp parameter. Further, the magnetostatic wiggler helps in enhancing the harmonic generation of the second order. This is due to the fact that dynamics of the oscillating electrons is altered due to the Lorentz force which, in turn, modifies the plasma wave and, hence, results in the efficient second-harmonic generation.

scholarly journals A modeling study of asymmetries in plasma irregularity characteristics near gradient reversals

2016 ◽  
Vol 34 (9) ◽  
pp. 709-723 ◽  
Author(s):  
Leslie J. Lamarche ◽  
Roman A. Makarevich
Keyword(s):  
Growth Rate ◽  
Wave Propagation ◽  
Plasma Density ◽  
Large Scale ◽  
Strong Dependence ◽  
Critical Role ◽  
Lower Ionosphere ◽  
Transitional Region ◽  
Plasma Convection ◽  
High Latitude Ionosphere

Abstract. Asymmetries in plasma density irregularity generation between the leading and trailing edges of the large-scale plasma density structures in the high-latitude ionosphere are investigated. A model is developed that evaluates the gradient-drift instability (GDI) growth rate differences across the gradient reversal that is applicable at all propagation directions and for the broad range of altitudes spanning the entire lower ionosphere. In particular, the model describes asymmetries that would be observed by an oblique scanning radar near density structures in the polar cap such as elongated polar patches. The dependencies on the relative orientations between the directions of the gradient reversal, plasma convection, and wave propagation are examined at different altitudinal regions. At all altitudes, the largest asymmetries are expected for observations along the gradient reversals, e.g., when an elongated structure is oriented along the radar boresight. The convection direction that results in the strongest asymmetries exhibits a strong dependence on the altitude, with the optimal convection being parallel to the gradient reversal in the E region, perpendicular to it in the F region, and at some angle between these extremes in the transitional region. Implications for observations of polar patches by oblique scanning radars within the Super Dual Auroral Radar Network are discussed. It is demonstrated that the wave propagation direction relative to the prevalent convection and gradient directions plays a critical role in controlling both the irregularity growth rate and its asymmetries near gradient reversals.

Adjustable plasma density gradient in a multipolar discharge

1984 ◽  
Vol 101 (8) ◽  
pp. 394-396 ◽  
Author(s):  
C. Gauthereau ◽  
G. Matthieussent ◽  
J.L. Rauch ◽  
J. Godiot
Keyword(s):  
Density Gradient ◽  
Plasma Density

Plasma-wave propagation across a magnetic field

1964 ◽  
Vol 4 (4) ◽  
pp. 272-278 ◽  
Author(s):  
A.B. Kitsenko ◽  
K.N. Stepanov
Keyword(s):  
Magnetic Field ◽  
Wave Propagation ◽  
Plasma Wave

Asymmetric optical vortex in plasma density gradient

2019 ◽  
Vol 61 (12) ◽  
pp. 125003
Author(s):  
Weifeng Gong ◽  
Baifei Shen ◽  
Xiaomei Zhang ◽  
Liangliang Ji ◽  
Lingang Zhang
Keyword(s):  
Density Gradient ◽  
Plasma Density ◽  
Optical Vortex
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