Assessment of effects of neutrals on the power threshold for L to H transitions in DIII-D

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To assess the effect of edge neutrals on the low to high confinement transition threshold, a broad range of plasma discharges has been analyzed. From this analysis, the transition power divided by the density, at constant magnetic field, appears to be a function of a single parameter measuring the neutrals` effect, This parameter cannot be uniquely identified. For instance, it may be the radial decay length of the neutral profile or the charge exchange damping rate at about r/a {approx} 0.95. This results suggest that there is a missing parameter linked to the neutrals in the power threshold scaling laws.

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8 p.

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Owen, L. W.; Carreras, B. A.; Maingi, R.; Mioduszewski, P. K.; Carlstrom, T. N. & Groebner, R. J. September 1, 1997.

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Description

To assess the effect of edge neutrals on the low to high confinement transition threshold, a broad range of plasma discharges has been analyzed. From this analysis, the transition power divided by the density, at constant magnetic field, appears to be a function of a single parameter measuring the neutrals` effect, This parameter cannot be uniquely identified. For instance, it may be the radial decay length of the neutral profile or the charge exchange damping rate at about r/a {approx} 0.95. This results suggest that there is a missing parameter linked to the neutrals in the power threshold scaling laws.

Physical Description

8 p.

Notes

INIS; OSTI as DE98000334

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  • US/Japan workshop on H-mode physics and 6th H-mode workshop, Kloster Seeon (Germany), 22-24 Sep 1997

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  • Other: DE98000334
  • Report No.: ORNL/CP--94439
  • Report No.: CONF-9709100--
  • Grant Number: AC05-96OR22464;AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 642744
  • Archival Resource Key: ark:/67531/metadc691455

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  • September 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 1, 2016, 6:50 p.m.

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Owen, L. W.; Carreras, B. A.; Maingi, R.; Mioduszewski, P. K.; Carlstrom, T. N. & Groebner, R. J. Assessment of effects of neutrals on the power threshold for L to H transitions in DIII-D, article, September 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc691455/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.