NIFS-754

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Author(s):

T.Minami, A.Fujisawa, H.Iguchi, M.Yokoyama, S.Murakami, Y.Liang, K.Ida, K.Toi, Y.Yoshimura, M.Isobe, C.Suzuki, S.Nishimura, I.Nomura, M.Yoshinuma, A.Shimizu, C.Takahashi, S.Okamura, K.Matsuoka and CHS group

Title:

Increased Understanding of Neoclassical Internal Transport Barrier on CHS

Date of publication:

Oct. 2002

Key words:

IAEA, fusion energy conference, Lyon

Abstract:

We report the recent progress of the study on neoclassical internal transport barrier (N-ITB) on Compact Helical System experiment. N-ITB has been observed for EC heated NBI plasma. The improved confinement region for electrons is expanded compared to that of the previous N-ITB plasma heated by only ECH. Moreover, the ion temperature is found to be increased simultaneously by about two to three times (T_i(0)~400-500eV) with steep gradient region at rho~0.6. From the measurement of the averaged peak energy intensity using the soft X-ray CCD camera it is confirmed that the impurity confinement is also improved with N-ITB. The radial electric field is observed to bifurcate into electron root (E_r~15kV/m) and rather large electric field shear (dE_r/dr~300kV/m^2) is produced in the layer between ion and electron root.

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