[Table of Contents]

Plasma and Fusion Research

Volume 1, 020 (2006)

Regular Articles

Dynamics of Self-Generated Magnetic Fields in Stagnation Phase and their Effects on Hot Spark Formation
Akiro HATA , Kunioki MIMA , Astushi SUNAHARA 1), Hideo NAGATOMO and Akio NISHIGUCHI 2)
Institute of Laser Engineering, Osaka University
1)
Institute of Laser Technology
2)
Osaka Institute of Technology
(Received 29 September 2005 / Accepted 3 February 2006 / Published 7 April 2006)

Abstract

The generalized temporal evolution equation of a magnetic field is derived for high density laser-fusion plasmas. Magnetic field generation and convection are simulated by using the 2D hydrodynamic code together with the magnetic field equation. It is found that magnetic fields are generated and compressed in association with the Rayleigh-Taylor instability of an imploding shell. In particular, the magnetic field convection by the Nernst effect is found to play an important role in the amplification of magnetic fields. The maximum magnetic field reaches 30 MG at maximum compression. This magnetic field may reduce the electron heat conduction around the hot spark. Therefore, it is concluded that the ignition condition for non-uniform implosion is influenced by self-generated magnetic fields.

Keywords

laser fusion, magnetic field, Rayleigh-Taylor instability, Nernst effect, convection, heat transport

DOI: 10.1585/pfr.1.020

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This paper may be cited as follows:

Akiro HATA , Kunioki MIMA , Astushi SUNAHARA , Hideo NAGATOMO and Akio NISHIGUCHI , Plasma Fusion Res. 1, 020 (2006).