Increased understanding of neoclassical internal transport barriers in CHS

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

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34 Citations (Scopus)


We report recent progress in the study of neoclassical internal transport barriers (N-ITBs) in the compact helical system (CHS) experiment. N-ITBs have been observed in electron cyclotron (EC) heated NBI plasmas. The improved confinement region for electrons is expanded compared with that of previous N-ITB plasmas heated by only EC heating. Moreover, the ion temperature is found to be increased simultaneously by two to three times (Ti(0) ∼ 400-500 eV), with a steep gradient region at ρ ∼ 0.6. From measurement of the averaged peak energy intensity using a soft x-ray CCD camera, it is confirmed that the impurity confinement is also improved with N-ITBs. The radial electric field is observed to bifurcate into ion and electron root (Er ∼ 15 kV m-1), and a rather large electric field shear (dEr/dr ∼ -300 kV m-2) is produced in the layer between ion and electron root.

Original languageEnglish
Pages (from-to)342-349
Number of pages8
JournalNuclear Fusion
Issue number2
Publication statusPublished - Feb 1 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics


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