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Description
A beam line with 4 MW beam power and 80 keV beam energy was designed and developed on the Experimental Advanced Superconducting Tokamak (EAST). A hot cathode high power ion source was employed for a neutral beam injector (NBI) on EAST. The ion source contains a hot cathode plasma generator and a tetrode accelerator. The beam cross section is 10 cm × 48 cm which depends on the beam injection window on EAST. A bucket plasma generator was designed. 32 filaments were installed in the top of plasma box, and were installed in two lines with the longest side. The accelerator is slot type and has four layers, which forms the extraction-acceleration-deceleration electrostatic structure.
The deuterium was used on the EAST ion source. The performance of ion source was investigated, including the effects of filament voltage and arc voltage on the arc current, beam current and arc efficiency. The characteristic of deuterium beam was also studied, which included the beam species, beam profiles and beam transmission efficiency.The beam energy needs matching the plasma density in the EAST and the highest injected beam energy reaches 70 keV and the total beam power is 1.8 MW for one source. The details of achievements of ion source with deuterium beam will be presented in the paper.
