Core electron-root confinement (CERC) in helical plasmas

M. Yokoyama, H. Maaberg, C. D. Beidler, V. Tribaldos, K. Ida, T. Estrada, F. Castejon, A. Fujisawa, T. Minami, T. Shimozuma, Y. Takeiri, A. Dinklage, S. Murakami, H. Yamada

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Abstract

The improvement of core electron heat confinement has been realized in a wide range of helical devices such as CHS, LHD, TJ-II and W7-AS. Strongly peaked electron temperature profiles and large positive radial electric field, E r, in the core region are common features for this improved confinement. Such observations are consistent with a transition to the 'electron-root' solution of the ambipolarity condition for Er in the context of neoclassical transport, which is unique to non-axisymmetric configurations. Based on this background, this improved confinement has been collectively dubbed 'core electron-root confinement' (CERC). The thresholds for CERC establishment are found for the collisionality and electron cyclotron heating power. The magnetic configuration properties (e.g. effective ripple and magnetic islands/rational surfaces) play important roles for CERC establishment.

Original languageEnglish
Pages (from-to)1213-1219
Number of pages7
JournalNuclear Fusion
Volume47
Issue number9
DOIs
Publication statusPublished - Dec 1 2007

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Yokoyama, M., Maaberg, H., Beidler, C. D., Tribaldos, V., Ida, K., Estrada, T., Castejon, F., Fujisawa, A., Minami, T., Shimozuma, T., Takeiri, Y., Dinklage, A., Murakami, S., & Yamada, H. (2007). Core electron-root confinement (CERC) in helical plasmas. Nuclear Fusion, 47(9), 1213-1219. https://doi.org/10.1088/0029-5515/47/9/018