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Collective alpha particle stopping for reduction of the threshold for laser fusion using nonlinear force driven plasma blocks

Published online by Cambridge University Press:  23 March 2009

B. Malekynia ,
M. Ghoranneviss ,
H. Hora  and
G.H. Miley
B. Malekynia
Affiliation:
Plasma Physics Research Centre, Science and Research Branch, Islamic Azad University IAU, Tehran-Poonak, Iran
M. Ghoranneviss
Affiliation:
Plasma Physics Research Centre, Science and Research Branch, Islamic Azad University IAU, Tehran-Poonak, Iran
H. Hora*
Affiliation:
Department of Theoretical Physics, University of New South Wales, Sydney, Australia
G.H. Miley
Affiliation:
Department of Nuclear, Plasma and Radiological Engineering, University of Illinois, Urbana, Illinois
*
Address correspondence and reprint requests to: H. 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

The anomaly at laser plasma interaction at laser pulses of TW to PW power and ps duration led to a very unique generation of quasi-neutral plasma blocks by a skin layer interaction avoiding the relativistic self-focusing. This is in contrast to numerous usual experiments. The plasma blocks have ion current densities above 1011 A/cm2 and may be used for a fast ignition scheme with comparably low compression of the deuterium tritium (DT) fuel. The difficulty is that a very high energy flux density E* of the ions is necessary according to the hydrodynamic theory (Bobin, 1971, 1974; Chu, 1972). This theory did not include the later discovered collective effect for the stopping power of the alpha particles. One problem is being discussed, whether the Bethe-Bloch binary collision theory or the collective collision theory of Gabor has to be applied. The inclusion of the collective effect results in a reduction of the threshold value of E* for ignition by a factor of about fife.

Keywords

Collective effectIgnition conditions for fusionLaser fusionLaser-plasma interactionPlasma hydrodynamics at laser irradiationStopping power for alpha particles
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 2 , June 2009 , pp. 233 - 241
Copyright
Copyright © Cambridge University Press 2009

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