Comprehensive energy transport scalings derived from DIII-D similarity experiments

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The dependences of heat transport on the dimensionless plasma physics parameters has been measured for both L-mode and H-mode plasmas on the DIII-D tokamak. Heat transport in L-mode plasmas has a gyroradius scaling that is gyro-Bohm-like for electrons and worse than Bohm-like for ions, with no measurable beta or collisionality dependence; this corresponds to having an energy confinement time that scales like {tau}{sub E} {proportional_to} n{sup 0.5}P{sup {minus}0.5}. H-mode plasmas have gyro-Bohm-like scaling of heat transport for both electrons and ions, weak beta scaling, and moderate collisionality scaling. In addition, H-mode plasmas have a strong safety factor scaling ({chi} {approximately} ... continued below

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7 p.

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Petty, C.C.; Luce, T.C. & Baity, F.W. December 1, 1998.

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The dependences of heat transport on the dimensionless plasma physics parameters has been measured for both L-mode and H-mode plasmas on the DIII-D tokamak. Heat transport in L-mode plasmas has a gyroradius scaling that is gyro-Bohm-like for electrons and worse than Bohm-like for ions, with no measurable beta or collisionality dependence; this corresponds to having an energy confinement time that scales like {tau}{sub E} {proportional_to} n{sup 0.5}P{sup {minus}0.5}. H-mode plasmas have gyro-Bohm-like scaling of heat transport for both electrons and ions, weak beta scaling, and moderate collisionality scaling. In addition, H-mode plasmas have a strong safety factor scaling ({chi} {approximately} q{sup 2}) at all radii. Combining these four dimensionless parameter scalings together gives an energy confinement time scaling for H-mode plasmas like {tau}{sub E} {proportional_to} B{sup {minus}1}{rho}{sup {minus}3.15}{beta}{sup 0.03}v{sup {minus}0.42}q{sub 95}{sup {minus}1.43} {proportional_to} I{sup 0.84}B{sup 0.39}n{sup 0.18}P{sup {minus}0.41}L{sup 2.0}, which is similar to empirical scalings derived from global confinement databases.

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7 p.

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INIS; OSTI as DE99001351

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  • 17. IAEA fusion energy conference, Yokohama (Japan), 19-24 Oct 1998

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  • Other: DE99001351
  • Report No.: GA--A22992
  • Report No.: CONF-981064--
  • Grant Number: AC03-89ER51114;AC05-96OR22464;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 296836
  • Archival Resource Key: ark:/67531/metadc684733

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  • December 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 1, 2016, 6:34 p.m.

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Petty, C.C.; Luce, T.C. & Baity, F.W. Comprehensive energy transport scalings derived from DIII-D similarity experiments, article, December 1, 1998; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc684733/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.