Advances in the simulation of toroidal gyro Landau fluid model turbulence

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The gyro-Landau fluid (GLF) model equations for toroidal geometry have been recently applied to the study ion temperature gradient (ITG) mode turbulence using the 3D nonlinear ballooning mode representation (BMR). The present paper extends this work by treating some unresolved issues conceming ITG turbulence with adiabatic electrons. Although eddies are highly elongated in the radial direction long time radial correlation lengths are short and comparable to poloidal lengths. Although transport at vanishing shear is not particularly large, transport at reverse global shear, is significantly less. Electrostatic transport at moderate shear is not much effected by inclusion of local shear and ... continued below

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33 p.

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Waltz, R. E.; Kerbel, G. D.; Milovich, J. & Hammett, G. W. December 1994.

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Description

The gyro-Landau fluid (GLF) model equations for toroidal geometry have been recently applied to the study ion temperature gradient (ITG) mode turbulence using the 3D nonlinear ballooning mode representation (BMR). The present paper extends this work by treating some unresolved issues conceming ITG turbulence with adiabatic electrons. Although eddies are highly elongated in the radial direction long time radial correlation lengths are short and comparable to poloidal lengths. Although transport at vanishing shear is not particularly large, transport at reverse global shear, is significantly less. Electrostatic transport at moderate shear is not much effected by inclusion of local shear and average favorable curvature. Transport is suppressed when critical E{times}B rotational shear is comparable to the maximum linear growth rate with only a weak dependence on magnetic shear. Self consistent turbulent transport of toroidal momentum can result in a transport bifurcation at suffciently large r/(Rq). However the main thrust of the new formulation in the paper deals with advances in the development of finite beta GLF models with trapped electron and BMR numerical methods for treating the fast parallel field motion of the untrapped electrons.

Physical Description

33 p.

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INIS; OSTI as DE95008387

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  • Meeting of the Division of Plasma Physics of the American Physical Society, Minneapolis, MN (United States), 7-11 Nov 1994

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  • Other: DE95008387
  • Report No.: GA-A--21871
  • Report No.: CONF-941101--5
  • Grant Number: AC02-76CH03073;FG03-92ER54150;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 34226
  • Archival Resource Key: ark:/67531/metadc688719

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  • December 1994

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  • July 25, 2015, 2:20 a.m.

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  • Aug. 1, 2016, 6:32 p.m.

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Waltz, R. E.; Kerbel, G. D.; Milovich, J. & Hammett, G. W. Advances in the simulation of toroidal gyro Landau fluid model turbulence, article, December 1994; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc688719/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.