<RESEARCH REPORT>Z_<EFF> MEASUREMENTS AND LOW-Z IMPURITY TRANSPORT FOR NBI AND ICRF HEATED PLASMA IN JIPP T-IIU TOKAMAK

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概要

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• A visible bremsstrahlung detector array system for Z_<eff> measurements and a charge exchange recombination spectroscopy (CXRS) system for fully ionized impurity profile measurements were installed on JIPP TII-U to study impurity transport for NBI and ICRF heated plasma. More impurities are sputtered by ICRF heating than by NBI and/or ohmic heatings. The carbon contribution to Z_<eff> is 80-90% for NBI heated plasmas, and 60% for NBI + ICRF heated plasmas. With a carbon coating of vacuum vessel, the Z_<eff> value decreases 2.4 to 1.7 and the carbon contribution to Z_<eff> increases up to 80-90%. We obtain the diffusion coefficient D_a=1.0m^2/s and the convective velocity ν_α(α)=13m/s at the plasma edge for carbon impurity from the radial profile and time evolution of fully ionized carbon after the ICRF pulse is turned on.

• 核融合科学研究所の論文

著者

• AOKI T.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• Aoki T.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Kaneko O.

  Research Information Center, Institute of Plasma Physics, Nagoya University

• IDA K.

  Institute of Plasma Physics, Nagoya University

• KAWAHATA K.

  Institute of Plasma Physics, Nagoya University

• Kawahata K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Kaneko O.

  Institute of Plasma Physics, Nagoya University

• AMANO T.

  Institute of Plasma Physics, Nagoya University

• Ida K.

  Research Information Center Institute Of Plasma Physics Nagoya University

• Kawahata K.

  Plasma Physics Laboratory Kyoto University

• Kawahata K.

  Institute Of Plasma Physics Nagoya University

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