Dependence of H-mode power threshold on global and local edge parameters

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Measurements of local electron density n{sub e}, electron temperature T{sub e}, and ion temperature T{sub i} have been made at the very edge of the plasma just prior to the transition into H-mode for four different single parameter scans in the DIII-D tokamak. The means and standard derivations of n{sub e}, T{sub e}, and T{sub i} under these conditions for a value of the normalized toroidal flux of 0.98 are respectively, 1.5 {+-} 0.7 x 10{sup 19} m{sup -3}, 0.051 {+-} 0.016 keV, and 0.14 {+-} 0.03 keV. The threshold condition for the transition is more sensitive to temperature than ... continued below

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4 p.

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Groebner, R.J.; Carlstrom, T.N. & Burrell, K.H. December 1, 1995.

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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 of local electron density n{sub e}, electron temperature T{sub e}, and ion temperature T{sub i} have been made at the very edge of the plasma just prior to the transition into H-mode for four different single parameter scans in the DIII-D tokamak. The means and standard derivations of n{sub e}, T{sub e}, and T{sub i} under these conditions for a value of the normalized toroidal flux of 0.98 are respectively, 1.5 {+-} 0.7 x 10{sup 19} m{sup -3}, 0.051 {+-} 0.016 keV, and 0.14 {+-} 0.03 keV. The threshold condition for the transition is more sensitive to temperature than to density. The data indicate that the dependence is not as simple as a requirement for a fixed value of the ion collisionality.

Physical Description

4 p.

Notes

INIS; OSTI as DE96005250

Source

  • IAEA technical committee meeting/ US-Japan workshop on H-mode physics, Princeton, NJ (United States), 18-20 Sep 1995

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  • Other: DE96005250
  • Report No.: GA--A22184
  • Report No.: CONF-9509238--7
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 192485
  • Archival Resource Key: ark:/67531/metadc670688

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  • December 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • April 18, 2016, 5:57 p.m.

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Groebner, R.J.; Carlstrom, T.N. & Burrell, K.H. Dependence of H-mode power threshold on global and local edge parameters, article, December 1, 1995; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc670688/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.