High-Energy Particles in the LHD (IMAGE) National Institutes of Natural Sciences Caption LHD high-energy particles circulate inside a plasma that is shaped like a twisted doughnut, and they cause plasma oscillations. In particular, when the period of the circulation and that of the plasma oscillation match, the amplitude of the oscillation grows. Credit Dr. Yasushi Todo Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.