Upgrade of the Neutral Beam Injection System on EAST

• Published in: IEEE transactions on plasma science Vol. 50; no. 11; pp. 4086 - 4090
• Main Authors: Xie, Y. H., Xie, Y. L., Liu, S., Xu, Y. J., Liang, L. Z., Wei, J. L., Zhao, Y. Z., Jiang, C. C., Li, J., Yi, W., Liu, Z. M., Hu, C. D.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Beam injection; Cathodes; Cooling; Deuterium; Feedback control; Hot cathodes; Injection; Injectors; Ion sources; Magnetic resonance; Magnetic shielding; Neutral beams; New technology; Particle beam injection; Particle beams; Plasma heating; Superconductivity; Tokamak devices
• ISSN: 0093-3813; 1939-9375
• DOI: 10.1109/TPS.2022.3164682

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.