Reconstruction of radiation profiles near the plasma boundary using an infrared imaging video bolometer in KSTAR

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An infrared imaging video bolometer using tomographic inversion can provide the total radiated power and 2-D radiation profiles, which are crucial information for impurity seeding experiments. Because large amounts of impurities exist at the plasma edge, accurate reconstruction of the radiation profiles near the material boundary is an important issue. In this study, two methods of boundary condition treatment are compared. One involves the exclusion of plasma pixels outside the boundary before reconstruction, whereas the other excludes these pixels after reconstruction. Phantom reconstruction tests are performed with D-shaped and divertor radiation profiles, and the second method shows an improvement in the boundary-reconstruction results compared with the first method. Using the second method, the radiation profiles of krypton (Kr) seeded H-mode plasmas in KSTAR are reconstructed. A significant amount of input power is dissipated through the Kr radiation. The 2-D reconstructed radiation profiles show that Kr mostly accumulates at the plasma core rather than at the edge. Published by AIP Publishing.
Publisher
AMER INST PHYSICS
Issue Date
2018-10
Language
English
Article Type
Article; Proceedings Paper
Citation

REVIEW OF SCIENTIFIC INSTRUMENTS, v.89, no.10, pp.10E111

ISSN
0034-6748
DOI
10.1063/1.5038904
URI
http://hdl.handle.net/10203/247135
Appears in Collection
NE-Journal Papers(저널논문)
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