Speaker
Bongki Jung
(Nuclear Fusion Engineering Development Division)
Description
A high-power pulsed arc ion source based on Marx generator has been developed at the Korea Atomic Energy Research Institute for the heating NBI system of the VEST which is a compact spherical tokamak at Seoul National University to study the reactor-relevant tokamak operating scenario[1][1]. The NBI system, with a total ion beam power of 0.8MW, was designed for the core plasma heating. However, the beam injection energy is required to be lower than 10 keV under the initial target plasma parameters of VEST due to beam-plasma coupling efficiency. For this reason, the beam injection energy needs to be modulated in a pulse duration of below 20 ms. To satisfy these requirements, the pulse power system based on a two-stage Marx generator is designed by utilizing high-energy capacitors and a solid-state switching system for the ion beam extraction and arc power supply. In addition, a battery-based power supply system is designed for the filament heating power supply. By using the pulse power supply system, large area pulsed arc ion source is successfully commissioned. Plasma parameters of the source in the pulse duration are measured by triple probe diagnostic and characteristics of the extracted ion beam is determined under various operating conditions.
References:
K. J. Chung, Y. H. An, B. K. Jung, H. Y. Lee, C. Sung, Y. S. Na, et al., Plasma Science and Technology 15 (2013) 244
Co-authors
Bongki Jung
(Nuclear Fusion Engineering Development Division, Korea Atomic Energy Research Institute, Dae-jeon, South Korea)
Doo-Hee Chang
(Nuclear Fusion Engineering Development Division, Korea Atomic Energy Research Institute, Dae-jeon, South Korea)
Kwang Won Lee
(Nuclear Fusion Engineering Development Division, Korea Atomic Energy Research Institute, Dae-jeon, South Korea)
Min Park
(Nuclear Fusion Engineering Development Division, Korea Atomic Energy Research Institute, Dae-jeon, South Korea)
Sang-Ryul In
(Nuclear Fusion Engineering Development Division, Korea Atomic Energy Research Institute, Dae-jeon, South Korea)
Seung Ho Jeong
(Nuclear Fusion Engineering Development Division, Korea Atomic Energy Research Institute, Dae-jeon, South Korea)
Sung Ryul Heo
(Nuclear Fusion Engineering Development Division, Korea Atomic Energy Research Institute, Dae-jeon, South Korea)
Tae-Seong Kim
(Nuclear Fusion Engineering Development Division, Korea Atomic Energy Research Institute, Dae-jeon, South Korea)
