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

doi:10.1088/0029-5515/47/9/018

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

Research output: Contribution to journal › Article › peer-review

100 Citations (Scopus)

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 E_r 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 language	English
Pages (from-to)	1213-1219
Number of pages	7
Journal	Nuclear Fusion
Volume	47
Issue number	9
DOIs	https://doi.org/10.1088/0029-5515/47/9/018
Publication status	Published - 2007
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/47/9/018

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@article{b14f581c360147f7ab428d8a6f121835,

title = "Core electron-root confinement (CERC) in helical plasmas",

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.",

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

year = "2007",

doi = "10.1088/0029-5515/47/9/018",

language = "English",

volume = "47",

pages = "1213--1219",

journal = "Nuclear Fusion",

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TY - JOUR

T1 - Core electron-root confinement (CERC) in helical plasmas

AU - Yokoyama, M.

AU - Maaberg, H.

AU - Beidler, C. D.

AU - Tribaldos, V.

AU - Ida, K.

AU - Estrada, T.

AU - Castejon, F.

AU - Fujisawa, A.

AU - Minami, T.

AU - Shimozuma, T.

AU - Takeiri, Y.

AU - Dinklage, A.

AU - Murakami, S.

AU - Yamada, H.

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

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DO - 10.1088/0029-5515/47/9/018

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VL - 47

SP - 1213

EP - 1219

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 9

ER -

Core electron-root confinement (CERC) in helical plasmas

Abstract

All Science Journal Classification (ASJC) codes

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