Laser Hole Boring into Overdense Plasma and Relativistic Electron Currents for Fast Ignition of ICF Targets

1997 ◽  
Vol 79 (14) ◽  
pp. 2686-2689 ◽  
Author(s):  
A. Pukhov ◽  
J. Meyer-ter-Vehn
Keyword(s):  
Relativistic Electron ◽  
Fast Ignition ◽  
Overdense Plasma

scholarly journals Density gradient effects on beam plasma linear instabilities for fast ignition scenario

2006 ◽  
Vol 24 (2) ◽  
pp. 269-273 ◽  
Author(s):  
ANTOINE BRET ◽  
CLAUDE DEUTSCH
Keyword(s):  
Electron Beam ◽  
Relativistic Electron ◽  
Density Gradient ◽  
Relativistic Electron Beam ◽  
Fast Ignition ◽  
The Other ◽  
Inertial Fusion ◽  
Linear Phase ◽  
Unstable System ◽  
Gradient Effects

In the fast ignition scenario for inertial fusion, a relativistic electron beam is supposed to travel from the side of the fusion pellet to its core. One one hand, a relativistic electron beam passing through a plasma is a highly unstable system. On the other hand, the pellet core is denser than its side by four orders of magnitude so that the beam makes its way through a important density gradient. We here investigate the effect of this gradient on the instabilities. It is found that they should develop so early that gradient effects are negligible in the linear phase.

scholarly journals Review of the current status of fast ignition research at the IAPCM

2014 ◽  
Vol 2 ◽  
Author(s):  
Hong-bo Cai ◽  
Si-zhong Wu ◽  
Jun-feng Wu ◽  
Mo Chen ◽  
Hua Zhang ◽  
...  
Keyword(s):  
Laser Beam ◽  
Relativistic Electron ◽  
Inertial Confinement Fusion ◽  
Coupling Efficiency ◽  
Fast Ignition ◽  
Current Status ◽  
Inertial Confinement ◽  
Applied Physics ◽  
Simulation Code ◽  
Computational Mathematics

AbstractWe review the present status and future prospects of fast ignition (FI) research of the theoretical group at the IAPCM (Institute of Applied Physics and Computational Mathematics, Beijing) as a part of the inertial confinement fusion project. Since the approval of the FI project at the IAPCM, we have devoted our efforts to improving the integrated codes for FI and designing advanced targets together with the experimental group. Recent FI experiments [K. U. Akli et al., Phys. Rev. E 86, 065402 (2012)] showed that the petawatt laser beam energy was not efficiently converted into the compressed core because of the beam divergence of relativistic electron beams. The coupling efficiency can be improved in three ways: (1) using a cone–wire-in-shell advanced target to enhance the transport efficiency, (2) using external magnetic fields to collimate fast electrons, and (3) reducing the prepulse level of the petawatt laser beam. The integrated codes for FI, named ICFI, including a radiation hydrodynamic code, a particle-in-cell (PIC) simulation code, and a hybrid fluid–PIC code, have been developed to design this advanced target at the IAPCM. The Shenguang-II upgraded laser facility has been constructed for FI research; it consists of eight beams (in total $24~ {\rm kJ}/3\omega $, 3 ns) for implosion compression, and a heating laser beam (0.5–1 kJ, 3–5 ps) for generating the relativistic electron beam. A fully integrated FI experiment is scheduled for the 2014 project.

Fundamental issues in fast ignition physics: from relativistic electron generation to proton driven ignition

2003 ◽  
Vol 43 (5) ◽  
pp. 362-368 ◽  
Author(s):  
A Macchi ◽  
A Antonicci ◽  
S Atzeni ◽  
D Batani ◽  
F Califano ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Fast Ignition ◽  
Electron Generation

Laser-driven relativistic electron beam for fast ignition

2015 ◽  
Vol 27 (3) ◽  
pp. 32001
Author(s):  
蔡洪波 Cai Hongbo ◽  
周沧涛 Zhou Cangtao ◽  
贾青 Jia Qing ◽  
吴思忠 Wu Sizhong ◽  
何民卿 He Minqing ◽  
...  
Keyword(s):  
Electron Beam ◽  
Relativistic Electron ◽  
Relativistic Electron Beam ◽  
Fast Ignition

scholarly journals Three-dimensional filamentary structures of a relativistic electron beam in fast ignition plasmas

2008 ◽  
Vol 15 (12) ◽  
pp. 120702 ◽  
Author(s):  
Anupam Karmakar ◽  
Naveen Kumar ◽  
Alexander Pukhov ◽  
O. Polomarov ◽  
G. Shvets
Keyword(s):  
Electron Beam ◽  
Relativistic Electron ◽  
Relativistic Electron Beam ◽  
Three Dimensional ◽  
Fast Ignition

scholarly journals Inertial confinement fusion fast ignition with ultra-relativistic electron beams

2010 ◽  
Vol 29 (1) ◽  
pp. 39-44 ◽  
Author(s):  
C. Deutsch ◽  
J.-P. Didelez
Keyword(s):  
Relativistic Electron ◽  
Inertial Confinement Fusion ◽  
Final State Interaction ◽  
Fast Ignition ◽  
Inelastic Electron ◽  
Inertial Confinement ◽  
Final State ◽  
Relativistic Electron Beams ◽  
Strong Langmuir Turbulence ◽  
Confinement Fusion

AbstractInertial confinement fusion fast ignition at very high relativistic electron beam energy is systematically explored through a possible combination of various stopping mechanisms including strong Langmuir turbulence, elastic, and inelastic electron interactions with target particles. A specific attention is given to final state interaction through catalysis by negative pion.

Relativistic electron heating in laser-produced plasmas

2001 ◽  
Vol 65 (5) ◽  
pp. 353-363 ◽  
Author(s):  
LIHUA CAO ◽  
TIEQIANG CHANG ◽  
WENWEI CHANG ◽  
ZONGWU YUE
Keyword(s):  
Relativistic Electron ◽  
Laser Pulses ◽  
Particle Simulation ◽  
Hot Electron ◽  
Frequency Spectra ◽  
Density Profiles ◽  
Electron Heating ◽  
Fourier Frequency ◽  
Particle Simulations ◽  
Overdense Plasma

Two-dimensional multi-timescale fully electromagnetic relativistic particle simulation is used to investigate relativistic electron heating in laser-produced plasmas. When laser pulses with peak intensities 1019 W cm−2 and different durations (e.g. 118 fs and 442 fs) are incident on overdense plasma slabs with step-like density profiles, the dynamics of plasmas and Fourier frequency spectra from our particle simulations demonstrate distinctly different properties in hot-electron temperatures, absorption, relativistic electron heating, and so on. The particular motions of the critical surfaces are discussed. From the two examples simulated in this paper, it is concluded that the interactions between plasmas and laser pulses with the same intensities and different durations are dominated by different mechanisms, which can lead to dissimilar dynamics of plasmas, relativistic heating, and so on.

scholarly journals Onset of coherent electromagnetic structures in the relativistic electron beam deuterium-tritium fuel interaction of fast ignition concern

2008 ◽  
Vol 26 (2) ◽  
pp. 157-165 ◽  
Author(s):  
C. Deutsch ◽  
A. Bret ◽  
M.-C. Firpo ◽  
L. Gremillet ◽  
E. Lefebvre ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Inertial Confinement Fusion ◽  
Fast Ignition ◽  
Skin Depth ◽  
Distribution Functions ◽  
Target System ◽  
Edge Density ◽  
Inertial Confinement ◽  
Density Gradients ◽  
Large Wave

AbstractWe focus attention on the combinations of swiftly growing electromagnetic instabilities (EMI) arising in the interaction of relativistic electron beams (REB) with precompressed deuterium-tritium (DT) fuels of fast ignition interest for inertial confinement fusion (ICF). REB-target system is taken neutral in charge and current with distribution functions including target and beam temperatures. We stress also the significant impact on modes growth rates (GR) of mode-mode coupling and intrabeam scattering. Collisional damping is documented at large wave numbers in terms of inverse skin depth. A quasi-linear approach yields lower GR than linear ones. One of the most conspicuous output of the linear analysis are three-dimensional (3D) broken ridges featuring the largest GR above k-space for an oblique propagation w.r.t initial particle beam direction. The given modes are seen immune to any temperature induced damping. Those novel patterns are easily produced by considering simultaneously Weibel, filamentation and two-stream instabilities. The behaviors persist in the presence of smooth density gradients or strong applied magnetic fields. Moreover, in the very early propagation stage with no current neutralization in the presence of large edge density gradients, REB demonstrate a characteristics ringlike and regularly spiked pattern in agreement with recent experimental results and previous simulations.

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