Continuum Edge Gyrokinetic Theory and Simulations

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The following results are presented from the development and application of TEMPEST, a fully nonlinear (full-f) five dimensional (3d2v) gyrokinetic continuum edge-plasma code. (1) As a test of the interaction of collisions and parallel streaming, TEMPEST is compared with published analytic and numerical results for endloss of particles confined by combined electrostatic and magnetic wells. Good agreement is found over a wide range of collisionality, confining potential, and mirror ratio; and the required velocity space resolution is modest. (2) In a large-aspect-ratio circular geometry, excellent agreement is found for a neoclassical equilibrium with parallel ion flow in the banana regime ... continued below

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Xu, X Q; Xiong, Z; Dorr, M R; Hittinger, J A; Bodi, K; Candy, J et al. January 9, 2007.

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The following results are presented from the development and application of TEMPEST, a fully nonlinear (full-f) five dimensional (3d2v) gyrokinetic continuum edge-plasma code. (1) As a test of the interaction of collisions and parallel streaming, TEMPEST is compared with published analytic and numerical results for endloss of particles confined by combined electrostatic and magnetic wells. Good agreement is found over a wide range of collisionality, confining potential, and mirror ratio; and the required velocity space resolution is modest. (2) In a large-aspect-ratio circular geometry, excellent agreement is found for a neoclassical equilibrium with parallel ion flow in the banana regime with zero temperature gradient and radial electric field. (3) The four-dimensional (2d2v) version of the code produces the first self-consistent simulation results of collisionless damping of geodesic acoustic modes and zonal flow (Rosenbluth-Hinton residual) with Boltzmann electrons using a full-f code. The electric field is also found to agree with the standard neoclassical expression for steep density and ion temperature gradients in the banana regime. In divertor geometry, it is found that the endloss of particles and energy induces parallel flow stronger than the core neoclassical predictions in the SOL. (5) Our 5D gyrokinetic formulation yields a set of nonlinear electrostatic gyrokinetic equations that are for both neoclassical and turbulence simulations.

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PDF-file: 19 pages; size: 0.7 Mbytes

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  • Journal Name: 21st IAEA Fusion Energy Conference 2006 , N/A, N/A, November 1, 2006, http://www-pub.iaea.org/MTCD/Meetings/FEC2006/th_p6-23.pdf

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  • Report No.: UCRL-JRNL-227862
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 936990
  • Archival Resource Key: ark:/67531/metadc893140

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  • January 9, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 23, 2016, 11:30 a.m.

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Xu, X Q; Xiong, Z; Dorr, M R; Hittinger, J A; Bodi, K; Candy, J et al. Continuum Edge Gyrokinetic Theory and Simulations, article, January 9, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc893140/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.