scholarly journals Effects of relativistic electron temperature on parametric instabilities for intense laser propagation in underdense plasma

2014 ◽  
Vol 21 (11) ◽  
pp. 112114 ◽  
Author(s):  
Yao Zhao ◽  
Jun Zheng ◽  
Min Chen ◽  
Lu-Le Yu ◽  
Su-Ming Weng ◽  
...  
Keyword(s):  
Electron Temperature ◽  
Relativistic Electron ◽  
Intense Laser ◽  
Laser Propagation ◽  
Parametric Instabilities ◽  
Underdense Plasma

scholarly journals Electromagnetic radiation from laser wakefields in underdense plasma

2014 ◽  
Vol 2 ◽  
Author(s):  
Yue Liu ◽  
Wei-Min Wang ◽  
Zheng-Ming Sheng
Keyword(s):  
Laser Pulse ◽  
Electromagnetic Radiation ◽  
Intense Laser ◽  
Moderate Intensity ◽  
Nonlinear Structure ◽  
Laser Propagation ◽  
Highly Nonlinear ◽  
A Chain ◽  
Underdense Plasma ◽  
Transverse Electron

AbstractIt is demonstrated by simulations and analysis that a wakefield driven by an ultrashort intense laser pulse in underdense plasma can emit tunable electromagnetic radiation along the laser propagation direction. The profile of such a kind of radiation is closely associated with the structure of the laser wakefield. In general, electromagnetic radiation in the terahertz range with its frequency a few times the electron plasma frequency can be generated in the moderate intensity regime. In the highly nonlinear case, a chain of radiation pulses is formed corresponding to the nonlinear structure of the wake. Study shows that the radiation is associated with the self-modulation process of the laser pulse in the wakefield and resulting transverse electron momenta from modulated asymmetric laser fields.

Dynamics of intense laser propagation in underdense plasma: Polarization dependence

2012 ◽  
Vol 19 (7) ◽  
pp. 073111 ◽  
Author(s):  
D. K. Singh ◽  
J. R. Davies ◽  
G. Sarri ◽  
F. Fiuza ◽  
L. O. Silva
Keyword(s):  
Polarization Dependence ◽  
Intense Laser ◽  
Laser Propagation ◽  
Underdense Plasma

scholarly journals Stopping of a relativistic electron beam in a plasma irradiated by an intense laser field

2014 ◽  
Vol 32 (1) ◽  
pp. 157-169 ◽  
Author(s):  
H.B. Nersisyan ◽  
C. Deutsch
Keyword(s):  
Electron Beam ◽  
Energy Loss ◽  
Relativistic Electron ◽  
Radiation Field ◽  
Relativistic Electron Beam ◽  
Intense Laser ◽  
Power Of The Test ◽  
Test Electron ◽  
Direction Of Polarization ◽  
Underdense Plasma

AbstractThe effects of a radiation field (RF) on the interaction process of a relativistic electron beam (REB) with an electron plasma are investigated. The stopping power of the test electron averaged with a period of the RF has been calculated assuming an underdense plasma, ω0 > ωp, where ω0is the frequency of the RF and ωpis the plasma frequency. In order to highlight the effect of the radiation field we present a comparison of our analytical and numerical results obtained for nonzero RF with those for vanishing RF. In particular, it has been shown that the weak RF increases the mean energy loss for small angles between the velocity of the REB and the direction of polarization of the RF while decreasing it at large angles. Furthermore, the relative deviation of the energy loss from the field-free value is strongly reduced with increasing the beam energy. Special case of the parallel orientation of the polarization of the RF with respect to the beam velocity has been also considered. At high-intensities of the RF two extreme regimes have been distinguished when the excited harmonics cancel effectively each other reducing strongly the energy loss or increasing it due to the constructive interference. Moreover, it has been demonstrated that the energy loss of the ultrarelativistic electron beam increases systematically with the intensity of the RF exceeding essentially the field-free value.

scholarly journals Coupling of electromagnetic filamentation instability and electrostatic Langmuir parametric instabilities in laser—plasma interactions

1994 ◽  
Vol 51 (1) ◽  
pp. 61-73 ◽  
Author(s):  
A. C.-L. Chian ◽  
F. B. Rizzato
Keyword(s):  
Laser Frequency ◽  
Intense Laser ◽  
Incident Laser ◽  
Laser Plasma Interactions ◽  
Parametric Decay ◽  
Frequency Coupling ◽  
Parametric Instabilities ◽  
Filamentation Instability ◽  
Underdense Plasma ◽  
Stream Instability

The interaction of electromagnetic filamentation instability and electrostatic Langmuir parametric instabilities (parametric decay instability and oscillating two-stream instability) driven by an intense laser in a plasma is examined. Near the critical layer of an underdense plasma, where the incident laser frequency is close to the local plasma frequency, coupling of unstable electromagnetic and electrostatic modes may occur. The transition from purely electromagnetic and purely electrostatic instabilities to hybrid instabilities is analysed using the generalized Zakharov equations.

GENERATION OF GOOD-QUALITY RELATIVISTIC ELECTRON BEAM FROM SELF-MODULATED LASER WAKEFIELD ACCELERATION

2007 ◽  
Vol 21 (03n04) ◽  
pp. 398-406 ◽  
Author(s):  
N. HAFZ ◽  
G. H. KIM ◽  
C. KIM ◽  
H. SUK
Keyword(s):  
Relativistic Electron ◽  
Energy Spread ◽  
Intense Laser ◽  
Laser Wakefield Acceleration ◽  
Nitrogen Gas ◽  
Laser Plasma Interaction ◽  
Wakefield Acceleration ◽  
Laser Wakefield ◽  
Central Energy ◽  
A Charge

A relativistic electron bunch with a large charge (~2 nC ) was produced from a self-modulated laser wakefield acceleration configuration. In this experiment, an intense laser pulse with a peak power of 2 TW and a duration of 700 fs was focused in a nitrogen gas jet, and multi-MeV electrons were observed from the strong laser-plasma interaction. By passing the electrons through a small pinhole-like collimator of cone f/70, we observed a narrowing in the electron beam's energy spread. The beam clearly showed a small energy-spread behavior with a central energy of 4.8 MeV and a charge of 115 pC. The acceleration gradient was estimated to be about 20 GeV/m.

Post-solitons and electron vortices generated by femtosecond intense laser interacting with uniform near-critical-density plasmas

2021 ◽  
Author(s):  
Dong-Ning Yue ◽  
Min Chen ◽  
Yao Zhao ◽  
Pan-Fei Geng ◽  
Xiao-Hui Yuan ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Critical Density ◽  
Laser Pulses ◽  
Intense Laser ◽  
Nonlinear Structures ◽  
Particle In Cell ◽  
Laser Propagation ◽  
Laser Driver ◽  
Linearly Polarized ◽  
Dimensional Simulation

Abstract Generation of nonlinear structures, such as stimulated Raman side scattering waves, post-solitons and electron vortices, during ultra-short intense laser pulse transportation in near-critical-density (NCD) plasmas are studied by using multi-dimensional particle-in-cell (PIC) simulations. In two-dimensional geometries, both P- and S- polarized laser pulses are used to drive these nonlinear structures and to check the polarization effects on them. In the S-polarized case, the scattered waves can be captured by surrounding plasmas leading to the generation of post-solitons, while the main pulse excites convective electric currents leading to the formation of electron vortices through Kelvin-Helmholtz instability (KHI). In the P-polarized case, the scattered waves dissipate their energy by heating surrounding plasmas. Electron vortices are excited due to the hosing instability of the drive laser. These polarization dependent physical processes are reproduced in two different planes perpendicular to the laser propagation direction in three-dimensional simulation with linearly polarized laser driver. The current work provides inspiration for future experiments of laser-NCD plasma interactions.

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