First neutral beam injection experiments on KSTAR tokamak

Journal Article · Wed Feb 15 00:00:00 EST 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3660254· OSTI ID:22063908

Jeong, S H; Chang, D H; Kim, T S; In, S R; Lee, K W; Jin, J T; Chang, D S; Oh, B H ^[1]; Bae, Y S; Kim, J S; Park, H T ^[2]; Watanabe, K; Inoue, T; Kashiwagi, M; Dairaku, M; Tobari, H; Hanada, M ^[3]

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1. Korea Atomic Energy Research Institute (KAERI), 989-111 Daedeokdaero, Yuseong-gu, Daejeon 305-353 (Korea, Republic of)
2. National Fusion Research Institute (NFRI), 113 Gwahangno, Yuseong-gu, Daejeon 305-333 (Korea, Republic of)
3. Japan Atomic Energy Agency (JAEA), 801-1 Mukouyama, Naka, Ibaraki-ken 311-0193 (Japan)

The first neutral beam (NB) injection system of the Korea Superconducting Tokamak Advanced Research (KSTAR) tokamak was partially completed in 2010 with only 1/3 of its full design capability, and NB heating experiments were carried out during the 2010 KSTAR operation campaign. The ion source is composed of a JAEA bucket plasma generator and a KAERI large multi-aperture accelerator assembly, which is designed to deliver a 1.5 MW, NB power of deuterium at 95 keV. Before the beam injection experiments, discharge, and beam extraction characteristics of the ion source were investigated. The ion source has good beam optics in a broad range of beam perveance. The optimum perveance is 1.1-1.3 {mu}P, and the minimum beam divergence angle measured by the Doppler shift spectroscopy is 0.8 deg. The ion species ratio is D{sup +}:D{sub 2}{sup +}:D{sub 3}{sup +}= 75:20:5 at beam current density of 85 mA/cm{sup 2}. The arc efficiency is more than 1.0 A/kW. In the 2010 KSTAR campaign, a deuterium NB power of 0.7-1.5 MW was successfully injected into the KSTAR plasma with a beam energy of 70-90 keV. L-H transitions were observed within a wide range of beam powers relative to a threshold value. The edge pedestal formation in the T{sub i} and T{sub e} profiles was verified through CES and electron cyclotron emission diagnostics. In every deuterium NB injection, a burst of D-D neutrons was recorded, and increases in the ion temperature and plasma stored energy were found.

• OSTI ID: 22063908
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM CURRENTS
BEAM EMITTANCE
BEAM EXTRACTION
BEAM INJECTION
BEAM OPTICS
CURRENT DENSITY
CYCLOTRONS
DEUTERIUM
DEUTERIUM IONS
DOPPLER EFFECT
ION SOURCES
ION TEMPERATURE
KEV RANGE
NEUTRONS
PARTICLE BEAMS
PLASMA PRODUCTION
SPACE CHARGE
SPECTROSCOPY
STORED ENERGY
TOKAMAK DEVICES