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Layers from initial Rayleigh density profiles by directed nonlinear force driven plasma blocks for alternative fast ignition

Published online by Cambridge University Press:  23 January 2009

E. Yazdani ,
Y. Cang ,
R. Sadighi-Bonabi ,
H. Hora  and
F. Osman
E. Yazdani
Affiliation:
Physics Department, Sharif University of Technology, Tehran, Iran
Y. Cang
Affiliation:
School of Computation and Mathematics, University of Western Sydney, Penrith, Australia Institute of Physics, Chinese Academy of Sciences, Beijing, China
R. Sadighi-Bonabi
Affiliation:
Physics Department, Sharif University of Technology, Tehran, Iran
H. Hora*
Affiliation:
Department of Theoretical Physics, University of New South Wales, Sydney, Australia
F. Osman
Affiliation:
School of Computation and Mathematics, University of Western Sydney, Penrith, Australia
*
Address correspondence and reprint requests to: Heinrich Hora, Department of Theoretical Physics, University of New South Wales, Sydney 2052, Australia. E-mail: h.hora@unsw.edu.au
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Abstract

Measurement of extremely new phenomena during the interaction of laser pulses with terawatt and higher power and picoseconds with plasmas arrived at drastically different anomalies in contrast to the usual observations if the laser pulses were very clean with a contrast ratio higher than 108. This was guaranteed by the suppression of prepulses during less than dozens of ps before the arrival of the main pulse resulting in the suppression of relativistic self-focusing. This anomaly was confirmed in many experimental details, and explained and numerically reproduced as a nonlinear force acceleration of skin layers generating quasi-neutral plasma blocks with ion current densities above 1011 A/cm2. This may support the requirement to produce a fast ignition deuterium tritium fusion at densities not much higher than the solid state by a single shot PW-ps laser pulse. With the aim to achieve separately studied ignition conditions, we are studying numerically how the necessary nonlinear force accelerated plasma blocks may reach the highest possible thickness by using optimized dielectric properties of the irradiated plasma. The use of double Rayleigh initial density profiles results in many wavelength thick low reflectivity directed plasma blocks of modest temperatures. Results of computations with the genuine two-fluid model are presented.

Keywords

Fast igniterFusion energyLaser driven IFEDielectric properties of plasmasRayleigh profilesGenuine two-fluid computations
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 1 , March 2009 , pp. 149 - 156
Copyright
Copyright © Cambridge University Press 2009

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