Ion Bernstein Wave Experiment on JFT-2M Tokamak

The ion Bernstein wave (IBW) is launched into the JFT-2M tokamak plasma in order to investigate the antenna loading resistance and the heating effect. Antenna loading resistance increases as the scrape-off electron density increases, in the same manner as that of fast wave antennas. Although the hydrogen ion temperature increases due to the IBW, most of the wave power is absorbed by the peripheral electrons. This is mainly due to the antenna location, which is at an oblique angle to the midplane. Peripheral electron heating induces the enhanced radiation loss, and IBW power of only about 120 kW can be launched because of the radiation limit.