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

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 10 8 . 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 selffocusing. 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 10 11 A/cm 2 . 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.

The evaluation of transmutation of hazardous nuclear waste of 90Sr, into valuable nuclear medicine of 89Sr by ultraintense lasers

“…The laser-matter interaction meets the high energy physics in laser-plasma accelerators in generating highly collimated bright X/g-ray sources (Giulietti et al, 2005;Chyla, 2006;Bessonov et al, 2008) and the production of thick ion blocks (Glowacz, 2006;Yazdani et al, 2009;Hora, 2009;Azizi et al, 2009;Hora et al, 2009). The laser-matter interaction meets the high energy physics in laser-plasma accelerators in generating highly collimated bright X/g-ray sources (Giulietti et al, 2005;Chyla, 2006;Bessonov et al, 2008) and the production of thick ion blocks (Glowacz, 2006;Yazdani et al, 2009;Hora, 2009;Azizi et al, 2009;Hora et al, 2009).…”

Threshold for laser driven block ignition for fusion energy from hydrogen boron-11

“…The mechanism for creating these high velocity quasineutral plasma blocks is based on skin-layer acceleration by nonlinear forces (SLANF) (see also Hora, 2009;Malekynia et al, 2009;Yazdani et al, 2009). This effect was first observed experimentally although long expected theoretically (Hora, 1981, Section 10.5), before the very clean ultra-intense TW-ps laser pulses were available.…”

The effects of circularly polarized laser pulse on generated electron nano-bunches in oscillating mirror model

“…Among all possible applications of laser, produced X-rays are useful for inertial confinement fusion (ICF) (Keith Matzen et al, 2005;Yazdani et al, 2009;Sadighi-Bonabi et al, 2010d), which is the most challenging problem. In these systems, X-rays are employed not only to diagnose the physical properties of the plasma, but also to reach the ignition conditions.…”