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나병근(Byungkeun NA) 한국진공학회 2020 진공 이야기 Vol.7 No.3
Neutral Beam Injector (NBI) is one of the main heating devices in atokamak. In this article, the structure and the characteristics of NBI are described in terms of vacuum and plasma. The current status of the domestic NBI technology is introduced through the performance of KSTAR NBI. A negative ion based NBI (NNBI) such as ITER NBI maintains high neutralization efficiency even at high beam energy. A NNBI is much more complicated than a positive ion based NBI, but it still has possibilities to increase its performance. The future of the NBI research and development is found in NNBI.