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Holistic Simulation for FIREX Project with FI3

Published online by Cambridge University Press:  15 October 2007

T. Johzaki ,
H. Sakagami ,
H. Nagatomo  and
K. Mima
T. Johzaki*
Affiliation:
Institute of Laser Engineering, Osaka University, Suita, Japan
H. Sakagami
Affiliation:
Department of Simulation Science, National Institute for Fusion Science, Toki, Japan
H. Nagatomo
Affiliation:
Institute of Laser Engineering, Osaka University, Suita, Japan
K. Mima
Affiliation:
Institute of Laser Engineering, Osaka University, Suita, Japan
*
Address correspondence and reprint requests to: T. Johzaki, Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan. E-mail: tjohzaki@ile.osaka-u.ac.jp
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Abstract

In fast ignition research, the clarification of core heating mechanism is one of the most critical issues. To understand and identify the crucial physics in fast heating, we developed the fast ignition integrated interconnecting code FI3 and carried out the core heating simulations for fast heating experiments with cone-guided targets. It was found that the scale length of the pre-plasma at the inner-surface of the cone and the density gap at the contact surface between the cone tip and the imploded core plasma strongly affect the efficiency of core heating. In the case of heating laser with intensity of 1020 W/cm2 and duration of 1 ps, the pre-plasma scale length of 1.5 µm is optimum for the core heating; the dense core is heated up to 0.86 keV. In the double scale length case (long scale of ~5 µm in underdense region and short scale of ~ 1 µm in overdense region), of which generation due to the pre-pulse irradiation of heating pulse is observed at the radiation–hydro simulations, the dense core is heated more efficiently than single short scale length cases. The contribution of fast ions to the core heating is also discussed.

Keywords

Core heatingFast ignitionIntegrated simulationPre-plasma scale length
Type
Research Article
Information
Laser and Particle Beams , Volume 25 , Issue 4 , December 2007 , pp. 621 - 629
Copyright
Copyright © Cambridge University Press 2007

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