Abstract
Alfven eigen modes were observed in the Large Helical Device for various magnetic field strengths and plasma densities. It was found that Alfven eigen modes could be excited at much higher frequencies (0.5 ˜ 2.5 MHz) and higher magnetic fields (1.5 ˜ 2.83 T) than previously reported. A part of the estimated Alfven velocities (2 ˜ 6 × 107 m/s) exceeded the thermal velocity of injected neutral beams (˜ 4.1 × 106 m/s).
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