Abstract
A large rf-driven hydrogen negative ion source has been constructed for applying to the neutral beam injector of the next step fusion experimental devices. The negative ion source was optimized for plasma production and negative ion extraction. A high density plasma of 1.5 × 10 12 cm −3 was generated in the plasma generator with dimensions of 30 × 30 × 20 cm 3 at the rf input power of 18 kW. In the pure-volume operation the hydrogen negative ion current of 5.5 mA, corresponding to 5.0 (mA/cm 2 )/(W/cm 3 ) was extracted at 13.1 mTorr of the gas pressure. Cesium effects which are observed in a filament-arc type negative ion source were also confirmed in the rf-driven negative ion source. The rf-transmission efficiency is improved by using a capacitively coupled DC isolator to the rf ion source.
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