TY - JOUR
T1 - Plasma surface interaction on the surface of tungsten divertor tiles in LHD
AU - Tokitani, M.
AU - Yoshida, N.
AU - Masuzaki, S.
AU - Noda, N.
AU - Sagara, A.
AU - Yamada, H.
AU - Komori, A.
AU - Nagata, S.
AU - Tsuchiya, B.
N1 - Funding Information:
This study was financially supported by the Japan Ministry of Education, Culture, Sports, Science and technology . This work was partly performed with the inter-university cooperative research program of the Institute for Materials Research, Tohoku University. The authors would like to thank Ms. R. Yoshihara of WDB Corp. for FIB fabrication.
PY - 2011/8/1
Y1 - 2011/8/1
N2 - Four graphite divertor tiles coated with a 100 μm thick layer of tungsten by using a vacuum plasma spray (VPS) method were installed in the LHD (Large Helical Device) in the 2008FY campaign (a total of 1700 pieces of graphite tiles are used in LHD). Tungsten emission of the plasma and the reliability of the coated tungsten layer and graphite substrate have been investigated by using real-time spectroscopic analysis and post-mortem surface analysis, respectively. The tungsten coated tiles could adequately withstand for a single experimental campaign, the heat and particle loads from the divertor plasma which were highly localized at the strike points. Tungsten accumulation in the core plasma could not be seen for the operation schemes in this campaign, and sputtered tungsten impurities did not have any influence on plasma discharges.
AB - Four graphite divertor tiles coated with a 100 μm thick layer of tungsten by using a vacuum plasma spray (VPS) method were installed in the LHD (Large Helical Device) in the 2008FY campaign (a total of 1700 pieces of graphite tiles are used in LHD). Tungsten emission of the plasma and the reliability of the coated tungsten layer and graphite substrate have been investigated by using real-time spectroscopic analysis and post-mortem surface analysis, respectively. The tungsten coated tiles could adequately withstand for a single experimental campaign, the heat and particle loads from the divertor plasma which were highly localized at the strike points. Tungsten accumulation in the core plasma could not be seen for the operation schemes in this campaign, and sputtered tungsten impurities did not have any influence on plasma discharges.
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U2 - 10.1016/j.jnucmat.2010.08.034
DO - 10.1016/j.jnucmat.2010.08.034
M3 - Article
AN - SCOPUS:80054834279
VL - 415
SP - S87-S91
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
IS - 1 SUPPL
ER -