Abstract
The Korea Atomic Energy Research Institute (KAERI) is developing a new concept of cesium-free negative hydrogen (deuterium) ion source based on a Two-Region Arc Plasma (TRAP) ion source for a neutral beam injection (NBI) system in a fusion tokamak. The plasma generator of the ion source consists of magnetic cusp field bucket as an anode and filaments as a cathode. The main feature of the TRAP ion source is that the generated plasma has two regions (a high-energy electron region and a low-energy electron region) without an external magnetic filter field. This plasma is generated by optimization of the filament electron emission and magnetic cusp field. The plasma generator of the TRAP ion source has been designed to study the effects of two-region plasma generation and the resulting negative ion generation. An extractor (also called the pre-accelerator) was also designed. The extractor consists of four grids (G1, G2, G3, G4) and permanent magnets are employed to suppress co-extracted electron currents. The design of the TRAP ion source is finished and fabrications are currently in progress. This study discusses the main considerations and simulation results for the design of the TRAP ion source.
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