Advanced Plasma Energy

Advanced Energy Generation Division Advanced Plasma Energy Research Section

Professor : Kazunobu NAGASAKI
Associate Professor : Shinji KOBAYASHI

High-power microwave system and high-power neutral beam injection for plasma heating and current drive, and plasma diagnostics using microwaves and beam emission spectroscopy are being developed by controlling charged particles and electromagnetic field.

Development of Advanced Energy by electromagnetic waves and particle beams

Advanced and innovative control methods for the collective behavior of charged particles are being developed in this research section to bring about enormous contributions to the human beings. Emphasized are particularly studies of nonlinear interactions between charged particles and electromagnetic fields. Production, heating, current drive and MHD suppression of fusion plasmas by electron cyclotron resonance are studied by using high-power microwave sources such as magnetrons and gyrotrons and neutral beam injection system. Application of microwaves is also targeted for development of heating and current drive systems. Neutral beam injection system based on high power hydrogen ion sources is used for an attractive scheme for sustainment of high-density plasmas and an effective active actuator of momentum and plasma current, which enables us to control the plasma transport to a preferable plasma confinement condition. In order to realize optimization of
magnetic configuration in helical devices, we originally designed and constructed an advanced helical device, Heliotron J in Kyoto University. In the Heliotron J device, we have been also developing plasma diagnostics such as radiometers, reflectometers and active beam spectroscopic systems (charge-exchange recombination spectroscopy and beam emission spectroscopy) to understand the heat, momentum and particle transport. Particle and heat transport in magnetically confined plasmas are studied by computational simulation using transport analysis codes based on heat absorption profile calculations.

High-power microwave source "Gyrotron"

A gyrotron produces a Gaussian-shaped microwave beam of 70GHz 500kW power, which is used for production, heating and current drive of fusion plasmas.


Neutral beam injection system for Heliotron J

Neutral beam injection system consists of two tangential neutral beam lines (BL1 and BL2). Each beam line has maximum applied voltage of 30keV and maximum injection power of 0.7MW, respectively.


Performance improvement of magnetically confined plasmas by control and suppression of instabilities

Our aim is to have good plasma confinement by means of the control and suppression of several kinds of unfavorable instabilities in high-temperature plasmas, based on experimental and numerical studies. In particular, we are interested in the resonant wave-particle interaction, which leads to risky degradation in a fusion plasma and are commonly observed in nature.


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