Pressure profile shape constancy in L-mode stellarator plasmas

A. V. Melnikov, L. G. Eliseev, I. Pastor, J. Herranz, C. Hidalgo, akihide fujisawa, T. Minami, K. A. Razumova, Yu N. Dnestrovskij, S. E. Lysenko, J. H. Harris

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

(I) In spite of large vaiety in the profiles of plasma electron temperature and density, theit product, electron pressure presents the feature of profile constancy in stellarator devises in onserved experiments with wide range of the plasma and heating parameters. (II) In the L-mode plasmas of the medium size stellarators, the pressure profiles show remarkable similarities between each other in low (TJ-II, W7-AS) and high (CHS, ATF) magnetic shear configurations. so, the universal profile, characterized by Po-1 dP/dp ∼ const = k, was found for L-mode plasmas and outside the ITB area. The other types of profile like in case of LHD [6] may take place for specific plasma conditions. (III) The obseration of the universal constant k in L-mode (e.g. in the absence of strong ExB effects) may suggests that tubulence and the associated transport reach some kind of saturation level, that does not depend on the absolute values of Te and ne, but alternative explanations (e.g. based on the role of atomic physics and links between magnetic configuration and gradient) can not be excluded. The validation of the transport-based hypothesis would require to characterized the link between local gradients and turbulent transport.

Original languageEnglish
Title of host publication34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts
Pages941-944
Number of pages4
Edition2
Publication statusPublished - Dec 1 2007
Externally publishedYes
Event34th European Physical Society Conference on Plasma Physics 2007, EPS 2007 - Warsaw, Poland
Duration: Jul 2 2007Jul 6 2007

Publication series

Name34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts
Number2
Volume31

Other

Other34th European Physical Society Conference on Plasma Physics 2007, EPS 2007
CountryPoland
CityWarsaw
Period7/2/077/6/07

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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  • Cite this

    Melnikov, A. V., Eliseev, L. G., Pastor, I., Herranz, J., Hidalgo, C., fujisawa, A., Minami, T., Razumova, K. A., Dnestrovskij, Y. N., Lysenko, S. E., & Harris, J. H. (2007). Pressure profile shape constancy in L-mode stellarator plasmas. In 34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts (2 ed., pp. 941-944). (34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts; Vol. 31, No. 2).