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

Yazdani, E ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1017/S0263034609000214
  3. Publisher: 2009
  4. Abstract:
  5. 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. © Cambridge University Press 2009
  6. Keywords:
  7. Dielectric properties of plasmas ; Fast igniter ; Fusion energy ; Genuine two-fluid computations ; Laser driven IFE ; Rayleigh profiles ; Contrast ratio ; Density profile ; Deuterium tritium fusion ; Fast igniter ; Fast ignition ; Fusion energy ; Genuine two-fluid computations ; Ignition conditions ; Initial density ; Interaction of laser pulse ; Ion current density ; Main pulse ; Nonlinear force ; Picoseconds ; Plasma blocks ; Prepulses ; Quasi-neutral plasma ; Rayleigh ; Rayleigh profiles ; Relativistic self focusing ; Single shots ; Skin layer ; Terawatt ; Two fluid model ; Ceramic capacitors ; Deuterium ; Dielectric properties ; Laser pulses ; Lasers ; Plasma accelerators ; Pulsed laser applications ; Tritium ; Plasmas
  8. Source: Laser and Particle Beams ; Volume 27, Issue 1 , 2009 , Pages 149-156 ; 02630346 (ISSN)
  9. URL: https://www.cambridge.org/core/journals/laser-and-particle-beams/article/layers-from-initial-rayleigh-density-profiles-by-directed-nonlinear-force-driven-plasma-blocks-for-alternative-fast-ignition/BE0E5D8280B02747C3139C284C96720D