Development of Ion Beam Sources with Wide Beam Energy and Current Ranges

概要

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Using a neutral beam injection system with large electrodes for a nuclear fusion device, high currents of nitrogen ion (N+) beams with energies of 300 V are successfully extracted for plasma application. In an acceleration with a low energy of 300 V, a N+ beam current (${\sim}9$ mA/cm2) on the ampere order is achieved without the optimization of extraction aperture diameter, electrode thickness and the distance between the electrodes. Main beam elements are confirmed as N+ particles using a mass spectrometer. In this system, concave electrodes with an effective diameter of 345 mm are adopted to focus the beams. Therefore, we can obtain a high current density and high-flux ion beam at the focal point. In an acceleration with a high energy of ${\sim}23$ kV, a N+ beam with a current density of ${\sim}456$ mA/cm2 and a flux of ${\sim}3.1\times 10^{22}$ m-2 s-1 is irradiated onto an aluminum material, then surface modification is confirmed.
2006-10-30