In the magnetic confinement plasmas of the Large Helical Device (LHD), a rotating fluctuation is often observed and its frequency sometimes decreases to almost zero. ...
In the Large Helical Device (LHD), for every plasma discharge, impurity layers have accumulated on the in-vessel-components. The layers are very fragile and are characterized by an exfoliation property. ...
To reveal the triton transport and the tritium migration in a deuterium plasma experiment in LHD, remaining tritium in divertor tiles made of graphite was investigated by using a combustion method. ...
The mixing state of hydrogen and deuterium in plasma was measured for the first time in the world in a mixed plasma experiment using hydrogen and deuterium in a large helical device (LHD). ...
In the Large Helical Device (LHD), the polarization of light emitted by hydrogen atoms has been measured with an accuracy of 1%. ...
We established a pulse shape discrimination method for evaluating thermal neutron flux using an artificial diamond detector. ...
We have developed a method for grasping the state of plasma using a large amount of data accumulated in experiments in the Large Helical Device (LHD) and have succeeded in demonstrating its practicality. ...
The Large Helical Device (LHD) has achieved ion temperatures above 120 million degrees Celsius. In high-ion temperature plasma discharges, magnetic field oscillations, generated by the pressure of the energetic ions, occur frequently. ...
The group of associate professor Hitoshi Tamura and others of the National Institute of Natural Sciences (NINS) National Institute for Fusion Science (NIFS) first applied topology optimization technique to the concept design of a helical fusion reactor which aims to demonstrate power generation. ...
The research team of Assistant Professor Masahiko Sato and Professor Yasushi Todo of the National Institutes of Natural Sciences (NINS) National Institute for Fusion Science (NIFS) has succeeded using computer simulation in reproducing the high-pressure plasma confinement observed in the Large Helical Device (LHD). ...
The confinement time of fast ions, which are generated by the neutral beam injection, has been estimated quantitatively in the LHD deuterium experiment by using neutron measurement and integrated simulation. ...
Tritium distribution on plasma facing surfaces after the first deuterium plasma experimental campaign, conducted over four months, was investigated in the Large Helical Device (LHD) for the first time in stellarator/heliotron devices by using the tritium imaging plate technique. ...
Fusion may be the future of clean energy. The same way the sun forces reactions between light elements, such as hydrogen, to produce heavy elements and heat energy, fusion on Earth can generate electricity by harnessing the power of elemental reactions. ...
It has been reproduced in the newly developed simulation code that plasma radiation concentrates at the “knot” of the magnetic field lines, and its mechanism is recognized as the same as thermal condensation instability, which also occurs at star formation in the universe. ...
We have developed a real-time control system for the millimeter-wave injection system for electron cyclotron heating and have shown that the system can heat the plasma efficiently by optimizing the injection for the time-varying plasma in the Large Helical Device (LHD)....
In high-temperature plasmas, it is not easy to diagnose the state of ions and fast ions because they cannot be measured directly by a thermometer. ...