Upgrade of the Neutral Beam Injection System on EAST
Yahong Xie, Yuanlai Xie, Songlin Liu, Yongjian Xu, Lizhen Liang, Jianglong Wei, Y. Z. Zhao, Caichao Jiang, J. Li, Wei Yi, Zhimin Liu, C. D. Hu
Abstract
The experimental advanced superconducting tokamak (EAST) is one of the fully superconducting tokamaks. A high-power neutral beam injector (NBI) system consisting of two injectors (EAST-NBI) was employed on EAST for plasma heating and current driving. The designed deuterium beam energy is 50–80 keV, beam power is 2–4 MW, and the beam duration is 10–100 s. Each beamline is equipped with two hot cathode ion sources and can be operated individually. In order to support the planned physics research on EAST, the NBI-2 was shifted from port F to port D, and at the same time, its injection direction was changed from counter-injection to co-injection. Furthermore, the high power ion source was optimized with better feedback control for stable long pulse beam, and a new technology of beam re-turn on was also developed and applied aiming at long pulse beam injection. Details of the NBI status will be presented in this article.