Open Access. Powered by Scholars. Published by Universities.®
Numerical Analysis and Computation Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Institution
- Keyword
-
- Articles (Local Journals) (3)
- "relativistic accordion" effect (1)
- Convective instability (1)
- Electromagnetic cascading and generation of trains of few-cycle, relativistically intense pulses in plasmas (1)
- Electromagnetic cascading in plasma (1)
-
- External injection (1)
- Frequency combs (1)
- GeV electrons from laser plasmas (1)
- Laser wakefield acceleration (1)
- Laser wakefield acceleration (theory) (1)
- Negative group velocity dispersion (1)
- Nonlinear wakefield (1)
- Parametric processes in laser plasmas (1)
- Petawatt lasers (1)
- Raman scattering in laterally bounded media (1)
- Relativistic self-focusing (1)
- Stimulated Raman scattering of short laser pulses in plasma channels (linear theory) (1)
- Stimulated Raman scattring in plasmas (1)
- Trains of few-cycle relativistically intense pulses (1)
- Publication
Articles 1 - 6 of 6
Full-Text Articles in Numerical Analysis and Computation
Compression Of Laser Radiation In Plasmas Using Electromagnetic Cascading, Serguei Y. Kalmykov, Gennady Shvets
Compression Of Laser Radiation In Plasmas Using Electromagnetic Cascading, Serguei Y. Kalmykov, Gennady Shvets
Serge Youri Kalmykov
Compressing high-power laser beams in plasmas via generation of a coherent cascade of electromagnetic sidebands is described. The technique requires two copropagating beams detuned by a near-resonant frequency, \Omega < \omega_{p}. The ponderomotive force of the laser beat wave drives an electron plasma wave which modifies the refractive index of plasma so as to produce a periodic phase modulation of the laser field with the beat period t_b = 2\pi/\Omega. A train of chirped laser beat notes (each of duration t_b) is thus created. The group velocity dispersion of radiation in plasma can then compress each beat note to a few-laser-cycle duration. As a result, a train of sharp electromagnetic spikes separated in time by t_b is formed. Depending on the plasma and laser parameters, chirping and compression can be implemented either concurrently in the same plasma or sequentially in different plasmas.
Strongly Coupled Large-Angle Stimulated Raman Scattering Of Short Laser Pulse In Plasma-Filled Capillary, Serguei Y. Kalmykov, Patrick Mora
Strongly Coupled Large-Angle Stimulated Raman Scattering Of Short Laser Pulse In Plasma-Filled Capillary, Serguei Y. Kalmykov, Patrick Mora
Serge Youri Kalmykov
Strongly coupled large-angle stimulated Raman scattering sLA SRSd of a short intense laser pulse develops in a plane plasma-filled capillary differently than in a plasma with open boundaries. Coupling the laser pulse to a capillary seeds the LA SRS in the forward direction (scattering angle smaller than \pi / 2 ) and can thus produce a high instability level in the vicinity of the entrance plane. In addition, oblique mirror reflections off capillary walls partly suppress the lateral convection of scattered radiation and increase the growth rate of the SRS under arbitrary (not too small) angle. Hence, the saturated convective …
Laser Wakefield Acceleration By Petawatt Ultrashort Laser Pulses, Leonid M. Gorbunov, Serguei Y. Kalmykov, Patrick Mora
Laser Wakefield Acceleration By Petawatt Ultrashort Laser Pulses, Leonid M. Gorbunov, Serguei Y. Kalmykov, Patrick Mora
Serge Youri Kalmykov
An ultrashort (about 30 fs) petawatt laser pulse focused with a wide focal spot (about 100 mm) in a rarefied plasma (n_0 ~ 10^{17} cm^{−3}) excites a nonlinear plasma wakefield which can accelerate injected electrons up to GeV energies without any pulse channeling. Under these conditions, propagation of the laser pulse with an overcritical power for relativistic self-focusing is almost the same as in vacuum. The nonlinear quasiplane plasma wave, whose amplitude and phase velocity vary along the laser path, effectively traps and accelerates injected electrons with a wide range of initial energies. Electrons accelerated over two Rayleigh lengths (about …
A Posteriori Estimate For Tikhonov Regularization Parameter, S. Abbasbandy
A Posteriori Estimate For Tikhonov Regularization Parameter, S. Abbasbandy
Saeid Abbasbandy
This paper deals the numerical solution of integral equations of the first kind with using regularization method. There are many stopping rules based on discrepancy principle or discussed in [3]. Here a new stopping rule is described which uses SVD (Singular Value Decomposition) and condition number of matrices. Finally, we give a number of numerical examples showing that the method works well in practice.
A Method For Solving Fuzzy Linear Systems, S. Abbasbandy, M. Alavi
A Method For Solving Fuzzy Linear Systems, S. Abbasbandy, M. Alavi
Saeid Abbasbandy
In this paper we present a method for solving fuzzy linear systems by two crisp linear systems. Also necessary and sufficient conditions for existence of solution are given. Some numerical examples illustrate the efficiency of the method.
A New Method For Solving Symmetric Fuzzy Linear Systems, S. Abbasbandy, M. Alavi
A New Method For Solving Symmetric Fuzzy Linear Systems, S. Abbasbandy, M. Alavi
Saeid Abbasbandy
In this paper we represent a new method for solving a symmetric fuzzy linear system by two crisp linear systems. Also necessary and sufficient conditions for the solution existence are given.