MHD instabilities in toroidal herical systems based on theory and reduced MHD equations by assuming the stellarator expansion are discussed. This approach sabrifices some physics compared to the three-dimensional culculation using the full MHD equations, but the improved resolution and computational speed offer a better understanding to explore the large parameeter space. The experimental results concerning MHD instabilities could be explained by the reduced MHD equations. Investigation of nonlinear evolution for the unstable mode can be pursued straightforwardly.
Utilization of magnetically guided liquid lithium flow was proposed in SENRI-I, Inertial Confinement Fusion Reactor Design of Osaka University. In the present article, experimental studies are described to ascertain the feasibility of a concept of magnetic guide of liquid metal to form an ICF reactor cavity. Major item is control of current-carrying Hg flow in the static magnetic field. Discussions on MHD stability of a magnetically guided liquid metal flow are also described.
In an Inertial Confinement Fusion (ICF) reactor with liquid lithium curtain, energetic charged particles and fast neutrons from a microexplosion give the impact and the pulsive load to the liquid lithium layer and drive the shock waves. To study the phenomena and the related problems of the structural mechanics, simulation experiments using liquid Hg irradiated by electron beam were carried out. Measurements and analysis of the shock wave are described in this article.