scholarly journals Physics of short pulse laser plasma interaction by multi-dimensional particle-in-cell simulations

1999 ◽  
Vol 17 (3) ◽  
pp. 571-578 ◽  
Author(s):  
A. PUKHOV ◽  
J. MEYER-TER-VEHN
Keyword(s):  
Short Pulse ◽  
Laser Pulses ◽  
Laser Plasma Interaction ◽  
Particle In Cell ◽  
Wake Field ◽  
Short Pulse Laser ◽  
Direct Laser ◽  
Underdense Plasmas ◽  
Laser Pulse Power ◽  
Overdense Plasma

Interaction of relativistically strong laser pulses with under- and overdense plasmas is studied by 3D particle-in-cell simulations. We show that electrons in the underdense plasmas can be accelerated not only by the plasma wake field, but also by direct laser push in self-generated magnetic and electrostatic fields. These two mechanisms of acceleration manifest themselves in the electron energy spectra as two effective “temperatures.” We show that the fast electrons transport a significant part of the laser pulse power through the overdense plasma in the form of magnetized jets. We also find high collective stopping because of an anomalous resistivity of the plasma.

scholarly journals On some theoretical problems of laser wake-field accelerators

2016 ◽  
Vol 82 (3) ◽  
Author(s):  
S. V. Bulanov ◽  
T. Zh. Esirkepov ◽  
Y. Hayashi ◽  
H. Kiriyama ◽  
J. K. Koga ◽  
...  
Keyword(s):  
Short Pulse ◽  
Three Dimensional ◽  
Fast Electrons ◽  
Particle In Cell ◽  
Wake Field ◽  
Multi Stage ◽  
Energy Scaling ◽  
Underdense Plasmas ◽  
Short Pulse Lasers ◽  
Ultra Short Pulse

Enhancement of the quality of laser wake-field accelerated (LWFA) electron beams implies the improvement and controllability of the properties of the wake waves generated by ultra-short pulse lasers in underdense plasmas. In this work we present a compendium of useful formulas giving relations between the laser and plasma target parameters allowing one to obtain basic dependences, e.g. the energy scaling of the electrons accelerated by the wake field excited in inhomogeneous media including multi-stage LWFA accelerators. Consideration of the effects of using the chirped laser pulse driver allows us to find the regimes where the chirp enhances the wake field amplitude. We present an analysis of the three-dimensional effects on the electron beam loading and on the unlimited LWFA acceleration in inhomogeneous plasmas. Using the conditions of electron trapping to the wake-field acceleration phase we analyse the multi-equal stage and multiuneven stage LWFA configurations. In the first configuration the energy of fast electrons is a linear function of the number of stages, and in the second case, the accelerated electron energy grows exponentially with the number of stages. The results of the two-dimensional particle-in-cell simulations presented here show the high quality electron acceleration in the triple stage injection–acceleration configuration.

scholarly journals Short pulse interaction experiments for fast ignitor applications

2000 ◽  
Vol 18 (3) ◽  
pp. 389-397 ◽  
Author(s):  
M. BORGHESI ◽  
A.J. MACKINNON ◽  
R. GAILLARD ◽  
G. MALKA ◽  
C. VICKERS ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Short Pulse ◽  
Laser Pulses ◽  
Inertial Confinement ◽  
Laser Plasma Interaction ◽  
Fast Ignitor ◽  
Underdense Plasmas ◽  
Confinement Fusion ◽  
Electron Propagation ◽  
Series Of Experiments

A detailed investigation of many aspects of the physics of laser–plasma interaction at very high laser intensities is required in order to assess the feasibility and the promise of the fast ignitor scheme for inertial confinement fusion. Relevant results, obtained in a series of experiments carried out at the Rutherford Appleton Laboratory, Chilton (UK) and at the Centre d'Etudes Atomique, Limeil Valenton (France), are presented and discussed here. In particular, the formation of plasma channels was observed following the propagation of relativistically intense, ps laser pulses through underdense plasmas. The channels persist long after the interaction, and their expansion has been measured. Efficient guiding of ultraintense laser pulses, both through preformed density channels and through solid guides, has been demonstrated. Finally, indication of collimated fast electron propagation through solid targets has been obtained from the observation of filamentary ionization tracks in laser irradiated solid targets.

scholarly journals Creation of hot dense matter in short-pulse laser-plasma interaction with tamped titanium foils

2007 ◽  
Vol 14 (10) ◽  
pp. 102701 ◽  
Author(s):  
S. N. Chen ◽  
G. Gregori ◽  
P. K. Patel ◽  
H.-K. Chung ◽  
R. G. Evans ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Laser Plasma ◽  
Short Pulse ◽  
Dense Matter ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Short Pulse Laser ◽  
Titanium Foils

Short pulse laser train for laser plasma interaction experiments

2007 ◽  
Vol 78 (8) ◽  
pp. 083501 ◽  
Author(s):  
J. L. Kline ◽  
T. Shimada ◽  
R. P. Johnson ◽  
D. S. Montgomery ◽  
B. M. Hegelich ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Laser Plasma ◽  
Short Pulse ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Short Pulse Laser

Optical diagnostics of laser-produced plasmas with ultra-short laser pulses

1980 ◽  
Vol 298 (1439) ◽  
pp. 407-414 ◽  
Keyword(s):  
Short Pulse ◽  
Laser Pulses ◽  
Laser Fusion ◽  
Light Pressure ◽  
Laser Plasma Interaction ◽  
Short Laser Pulses ◽  
Short Pulse Lasers ◽  
Pellet Density ◽  
Laser Heated ◽  
Interaction Problem

In laser fusion experiments the interesting phenomena occur on a picosecond timescale. Short-pulse lasers in combination with high resolution optics offer a powerful diagnostic tool. After a short description of the principles and experimental techniques I discuss three specific areas of the laser-plasma interaction problem, namely heat transport in the corona of a laser heated pellet, density profile steepening by light pressure and the generation of magnetic fields.

scholarly journals Stimulated Raman forward scattering of laser in a pre-formed plasma channel

2012 ◽  
Vol 30 (4) ◽  
pp. 605-611 ◽  
Author(s):  
Anuraj Panwar ◽  
Ashok Kumar ◽  
C.M. Ryu
Keyword(s):  
Growth Rate ◽  
Laser Pulse ◽  
Plasma Wave ◽  
Plasma Channel ◽  
Short Pulse ◽  
Density Perturbation ◽  
Laser Pulses ◽  
Forward Scattering ◽  
Short Pulse Laser ◽  
Stimulated Raman

AbstractStimulated Raman forward scattering (SRFS) of an intense short pulse laser in a plasma channel formed by two pre-laser pulses is investigated. The density nonuniformity of a plasma channel increases the focusing of main laser pulse. Main laser pulse excites a plasma wave and two electromagnetic sideband waves. Laser and the sidebands exert an axial ponderomotive force on electrons driving the plasma wave. The nonlinear currents arise at sideband frequencies. The density perturbation due to plasma wave beats with the oscillatory velocity due to pump to drive the sidebands. The normalized growth rate of SRFS increases with the density nonuniformity of a plasma channel. However, in the presence of a deep plasma channel the focusing is ineffective to laser intensity, but the growth rate increases with the intensity of main laser pulse.

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