National Institutes of Natural Science, National Institute for Fusion Science
Department of Helical Plasma Research, Fundamental Physics Simulation Research Division

Laser Fusion

Integrated Simulation for Fast Ignition

The fast ignition approach to inertial fusion energy, in which fuel compression and its heating are separated into two distinct steps, has been investigated by experiments. Thus we have been promoting the Fast Ignition Integrated Interconnecting code (FI3) project in tight collaboration with Osaka University, Kyushu University, University of Hyogo and Setsunan University. We introduce a radiation-hydro code to calculate overall fluid dynamics, a relativistic PIC code for the laser-plasma interaction, a hybrid code for the fast electron transport and a Fokker-Planck code to compute the core heating. The concept of the integrated simulation is shown in the figure.

Reference
Fast ignition integrated interconnecting code project for cone-guided targets H.Sakagami, T.Johzaki, H.Nagatomo, K.Mima Laser and Particle Beams 24, 191-198 (2006).
Interconnection between Hydro and PIC codes for Fast Ignition Simulations H. Sakagami and K. Mima Laser and Particle Beams, 22, 41-44 (2004).

Three Dimensional Rayleigh-Taylor Instability in Spherically Stagnating Systems


In the laser fusion, the Rayleigh-Taylor (RT) instability is one of important research topics. These figures show three-dimensional shapes of the contact surface. Initial perturbations are given by (a) a spherical harmonics function of mode (6, 3) or (b) (12, 6), (c) mode coupling with (6, 3) and (12, 6), and the combination of icosahedron and dodecahedron, including (d) randomly arranged bubbles/spikes, (e) randomly arranged bubbles, and (f) randomly arranged spikes. We found that the growth rate have depended only on the initial pertur-bation amplitude regardless of many other conditions.


Reference
Rayleigh-Taylor Instability in Spherically Stagnating Systems H.Sakagami, T.Okamoto, M.Horikoshi, K.Nishihara Anomalous Absorption Conference, Fajardo, Puerto Rico, June 26 - July 1, TP4 (2005).
Large-scale 3-D Fluid Simulations for Implosion Hydrodynamics on the Earth Simulator H. Sakagami and H. Murai Innovative Architecture for Future Generation High-Performance Processors and Systems, 102-108 (2004).


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