Critical edge parameters for H-mode transition in DIII-D

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Measurements in DIII-D of edge ion and electron temperatures (T{sub i} and T{sub e}) just prior to the transition to H-mode are presented. A fitting model based on a hyperbolic tangent function is used in the analysis. The edge temperatures are observed to increase during the L-phase with the application of auxiliary heating. The temperature rise is small if the H-mode power threshold is close to the Ohmic power level in the absence of auxiliary heating and is large if the H-mode threshold is well above the Ohmic power level. The edge temperatures just prior to the transition are approximately ... continued below

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8 p.

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Groebner, R.J. & Carlstrom, T.N. November 1, 1997.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

Measurements in DIII-D of edge ion and electron temperatures (T{sub i} and T{sub e}) just prior to the transition to H-mode are presented. A fitting model based on a hyperbolic tangent function is used in the analysis. The edge temperatures are observed to increase during the L-phase with the application of auxiliary heating. The temperature rise is small if the H-mode power threshold is close to the Ohmic power level in the absence of auxiliary heating and is large if the H-mode threshold is well above the Ohmic power level. The edge temperatures just prior to the transition are approximately proportional to the toroidal magnetic field Bt for the field either in the reversed or forward direction. However, for the reversed magnetic field, the temperatures are at least a factor of two higher than for the forward direction.

Physical Description

8 p.

Notes

INIS; OSTI as DE98001854

Source

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

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  • Other: DE98001854
  • Report No.: GA--A22723
  • Report No.: CONF-9709100--
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 634075
  • Archival Resource Key: ark:/67531/metadc695402

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • November 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • April 18, 2016, 5:57 p.m.

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Groebner, R.J. & Carlstrom, T.N. Critical edge parameters for H-mode transition in DIII-D, article, November 1, 1997; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc695402/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.