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Research Activities

Fusion Theory and Simulation Research Division

We are promoting theory and simulation research on the LHD and other toroidal fusion plasmas in order to contribute to the realization of fusion energy. Progress in theory and simulation research enables us to comprehend the physical mechanisms of high-temperature plasmas and predict favorable conditions for fusion reactors.

For the purpose of investigating the complex behaviors of 100 million degree plasma in a fusion reactor, several different theoretical models consisting of a variety of equations are used, and super-computer simulations are performed intensively. The stability of a magnetically-confined plasma is studied based on magnetohydrodynamics that describes a plasma as an electromagnetic fluid. Plasma transport processes are studied by kinetic models that treat collective motions of a huge number of ions and electrons in a plasma. Various theories and simulations combining fluid and kinetic models are in progress for research on diverse phenomena occurring in fusion plasmas such as turbulent electromagnetic fluctuations, instabilities driven by high-energy particles, radiation from impurities, ablation of hydrogen pellets, and other topics.

A simulation of plasma turbulence in the LHD