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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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First neutral beam injection experiments on KSTAR tokamak.

S H Jeong1, D H Chang, T S Kim

  • 1Korea Atomic Energy Research Institute (KAERI), 989-111 Daedeokdaero, Yuseong-gu, Daejeon 305-353, South Korea. shjeong2@kaeri.re.kr

The Review of Scientific Instruments
|March 3, 2012
PubMed
Summary

The KSTAR tokamak

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Area of Science:

  • Fusion Energy Research
  • Plasma Physics
  • Tokamak Technology

Background:

  • The Korea Superconducting Tokamak Advanced Research (KSTAR) initiated neutral beam (NB) heating experiments in 2010.
  • The initial NB injection system was partially completed, operating at one-third of its design capacity.

Purpose of the Study:

  • To characterize the ion source performance of the KSTAR NB injection system.
  • To evaluate the effectiveness of NB heating in KSTAR plasma during the 2010 operation campaign.

Main Methods:

  • Investigated ion source discharge and beam extraction characteristics.
  • Measured beam optics, divergence, ion species ratio, and arc efficiency.
  • Injected deuterium NB power into KSTAR plasma and analyzed diagnostic data.

Main Results:

  • The ion source demonstrated good beam optics with an optimum perveance of 1.1-1.3 μP and a minimum divergence of 0.8°.
  • Deuterium NB power of 0.7-1.5 MW was successfully injected at 70-90 keV.
  • Observed L-H transitions, edge pedestal formation, D-D neutron bursts, and increased ion temperature and stored energy.

Conclusions:

  • The KSTAR NB injection system proved effective for plasma heating and achieving L-H transitions.
  • Experimental results validated the system's capability and provided crucial data for future upgrades and operation.