Abstract
Present status of the hydrogen negative ion source development is reported for an NBI system in the Large Helical Device. An external-filter type negative ion source has produced a 16.2 A of H - ion beam with the energy of 47 keV at the arc efficiency of 0.1 A/kW and at the operational gas pressure of 3.8 mTorr. The H - ion beam of 13.6 A was successfully accelerated to 125 keV with two-stage acceleration. A rod-filter type negative ion source has also produced a 16 A of H - ion beam with the current density of 45 mA/cm 2 . A vacuum-immersed negative ion source has demonstrated stable operation on condition that the ion source is shielded from the beam-induced plasma. For the future long-lifetime operation, an RF-driven negative ion source has been developed, where an induction coil antenna is placed inside a metal-walled magnetic multicusp source.
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