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High-Recycling Characteristics in the KSTAR Tokamak Divertor by Using Two-Dimensional Transport Simulations

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Authors
Ko, Jin-Seok; Kim, Deok-Kyu; Hong, Sang Hee; Im, Ki-Hak
Issue Date
2002-08
Publisher
Korean Physical Society
Citation
J. Korean Phys. Soc. 41(2), 212-220
Keywords
KSTAR tokamakhigh-recycling director operation regimeedge plasma transporttwo-dimensional fluid simulation
Abstract
The operation space in the conduction-limited divertor regime of the KSTAR (Korea Superconducting Tokamak Advanced Research) tokamak is obtained in terms of the upstream density and the input power through numerical simulations using a two-dimensional two-fluid edge plasma transport
code coupled with a two-dimensional Monte Carlo recycling neutral transport code in which the electron impact ionization and the charge exchange of recycling neutrals are taken into account. Two major high-recycling characteristics, the parallel temperature gradient and plasma pressure conservation, are identi ed in this operation space along the magnetic ux tubes between the upstream
position and the divertor target plate in the KSTAR tokamak. Inclusion of ion pressures
in the present simulations for total plasma pressures shows firm evidence of pressure conservation in the high-recycling regime. In addition, scalings of the plasma temperature and density at the divertor plate with the upstream plasma density are derived, and they are compared with those
in a simple one-dimensional analytic transport model, the so-called two-point model. Finally, the simulation shows that the peaked feature of the upstream ion temperature pro le adjacent to the separatrix a ects the distribution of the divertor heat flux. This indicates that the ion parallel heat conduction near the separatrix plays an important role in determining the radial pro le of the heat flux onto the divertor target, as the electron parallel heat conduction does in the conduction-limited regime. It is, therefore, suggested that modification of the upstream plasma property profiles will
make it possible to control the power dispersal on the divertor plate.
ISSN
0374-4884
Language
English
URI
https://hdl.handle.net/10371/69559
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Energy Systems Engineering (에너지시스템공학부)Nuclear Engineering (원자핵공학전공)Journal Papers (저널논문_원자핵공학과)
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