Visualization of the Plasma Shape in a Force Free Helical Reactor, FFHR

Using magnetic field to confine the plasma can realize controlled nuclear fusion. A device called Force Free Helical Reactor (FFHR) using helical coils to generate a magnetic trap is being designed by National Institute for Fusion Science (NIFS) in Japan. Because the FFHR has the plasma with a complicated three-dimensional (3D) structure, 3D design of the in-vessel components is necessary. In the past, the design of the in-vessel components has been conducted based on the discrete two-dimensional poloidal cross-sectional shapes. However, this method is not effective and complete check of the interference is difficult. Since plasma movement follows the magnetic field lines, the plasma shape could be generated from them. Marching cubes method is applied for generating the polygon mesh. A graphic software is used for modifying and rendering.