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Research Activities

Numerical Simulastin Research Project

A fusion plasma is a typical complex system that is controlled by multi-physics and multi-time/space nonlinear processes, from macroscopic phenomena, such as plasma transport, to the microscopic electron dynamics. In order to understand and systematize physical mechanisms in fusion plasmas, large-scale numerical simulation research has been carried out by utilizing the full capability of a supercomputer. Based on this research and development, we will promote large-scale simulation science aimed at the ultimate realization of a helical numerical test reactor which will be an integrated predictive model for plasma behavior over the whole machine range.

Magnetohydrodynamic Simulation

We analyze the behavior of a magnetically confined plasma through a magnetohydrodynamic (MHD) approach. This approach allows us to treat global phenomena in the time scale slower than each particle motion. We carry out computer simulations to analyze the plasmas destabilized by the plasma current and the pressure gradient, and to search for stable magnetic configurations.

Kinetic Transport Simulation

In high-temperature plasmas confined in fusion devices, the transport of particles and heat is driven by the inhomogeneity of the magnetic field, density, and temperature profiles. Using supercomputers, we examine particle motions and their collective properties causing turbulence, and investigate more efficient ways in which the plasmas are well confined.

Plasma-Wall Interaction Simulation

We estimate the durability of divertor plates made of various kinds of materials, such as graphite and diamond, against plasma exposure by use of molecular dynamics (MD) simulation.
MD simulation considers the motion of each atom and interactions between atoms in the system, and solves the equations of motion for many particles to predict material properties.

Plasma Simulator

The Plasma Simulator is utilized to promote the Numerical Simulation Research Project. The Plasma Simulator is a massive parallel supercomputer with a computational performance of 315 teraflops, a main memory of 40.25 terabytes, and a storage system capacity 2 petabytes. Collaborators can remotely use the Plasma Simulator from their own research sites through the Internet.

Three-dimensional Immersive Virtual-Reality System “CompleXcope”

The three-dimensional (3D) Immersive Virtual-Reality (VR) System “CompleXcope” can make a viewer feel as if they are in the simulation world, because the system does not show 3D objects only from one direction of the eyes of the viewer, but also displays 3D objects in the 3D space of the viewer. In order to research the plasma simulation results, in which the plasma shows complex shapes and behaviors spatiotemporally, we are investigating the VR visualization. Furthermore, we are attempting an implementation toward the optimization of LHD by re-creating the plasma dynamics in the interior of the LHD.