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Laser fusion with nonlinear force driven plasma blocks: Thresholds and dielectric effects

Published online by Cambridge University Press:  19 March 2009

H. Hora
H. Hora*
Affiliation:
Department of Theoretical Physics, University of New South Wales, Sydney, Australia
*
Address correspondence and reprint requests to: H. Hora, Department of Theoretical Physics, University of New South Wales, Sydney 2052, Australia. E-mail: [email protected]
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Abstract

Anomalous interaction of picosecond laser pulses of terawatt to petawatt power is due to suppression of relativistic self-focusing if prepulses are cut-off by a contrast ratio higher than 108, resulting in quasi-neutral directed plasma blocks with deuterium tritium ion current densities above 1011 A/cm2. This is still not high enough for ignition of solid-state density deuterium tritium because the energy flux density E* has to be higher than the threshold of 4 ×108 J/cm2 obtained within the theory of Chu (1972). A revision of this evaluation shows a reduction of this threshold by a factor 20 if the later discovered inhibition factors for thermal conduction because of double layer effects as well as the shorter stopping lengths of the alpha particles due to collective effects are taken into account. Under these relaxed conditions, the parameters of nonlinear force generated blocks of dielectrically increased thickness for deuterium tritium ignition with directed ions of energies near the 80 keV resonances are discussed.

Keywords

Collective effect for stopping power of alphasDielectric plasma responseFast ignitionIgnition thresholdsInhibition factor for thermal conductivityLaser driven inertial fusion energyPetawatt laser plusesRayleigh density profilesSkin layer acceleration by nonlinear forces
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 2 , June 2009 , pp. 207 - 222
Copyright
Copyright © Cambridge University Press 2009

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