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A radio-frequency-driven hydrogen-ion source of the diagnostic neutral beam has been developed for the Hanbit magnetic mirror device at the Korea Basic Science Institute IS. M. Hwang et al., Trans. Fusion Technol. 35, 99 (1999)]. The three-electrode system with 37 apertures extracts the hydrogen-ion beam with 29.8 kev beam energy and 1.2 A beam current at a 9.6 cm diam. The ion source has the capability of varying the beam pulse width from 10 to 100 ms and also is capable of beam modulation at 50 Hz with a 10 ms flattop pulse width. The beam power and the ratio of the mixed ion species were measured by infrared thermography and Doppler shift spectroscopy, respectively. Most recent experimental results will be presented in this article. [ABSTRACT FROM AUTHOR]

Describes the first results of the ion bean extraction experiments conducted at Korea Basic Science Institute. Experimental setup; Results; Conclusion.

We designed a high power and ultra-wideband two-section 3 dB coaxial hybrid coupler for load resilient ion cyclotron range of frequency heating by configuring asymmetric impedance matching using a three-dimensional simulation code, hfss. By adjusting the characteristic impedances of main and coupled lines of the hybrid coupler, we realized that the bandwidth of the proposed circuit is not only wider than that of a conventional three-section coupler, but also that the bandwidth is almost twice as wide compared to the conventional two-section hybrid coupler while maintaining the identical overall size. [ABSTRACT FROM AUTHOR]

Analyzes the ion species ratios and the angular divergences of the ion beams of a radio-frequency driven multicusp ion source using a Doppler shift spectroscopy of H[sub alpha] spectral lines. Effect of extraction voltage on beam divergences; Effect of gas-target thickness on correction factors; Ion species ratios at varying source pressures.