Gyrokinetic simulations in general geometry and applications to collisional damping of zonal flows

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Description

A fully three-dimensional gyrokinetic particle code using magnetic coordinates for general geometry has been developed and applied to the investigation of zonal flows dynamics in toroidal ion-temperature-gradient turbulence. Full torus simulation results support the important conclusion that turbulence-driven zonal flows significantly reduce the turbulent transport. Linear collisionless simulations for damping of an initial poloidal flow perturbation exhibit an asymptotic residual flow. The collisional damping of this residual causes the dependence of ion thermal transport on the ion-ion collision frequency even in regimes where the instabilities are collisionless.

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418 Kilobytes pages

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Lin, Z.; Hahm, T.S.; Lee, W.W.; Tang, W.M. & White, R.B. February 15, 2000.

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Description

A fully three-dimensional gyrokinetic particle code using magnetic coordinates for general geometry has been developed and applied to the investigation of zonal flows dynamics in toroidal ion-temperature-gradient turbulence. Full torus simulation results support the important conclusion that turbulence-driven zonal flows significantly reduce the turbulent transport. Linear collisionless simulations for damping of an initial poloidal flow perturbation exhibit an asymptotic residual flow. The collisional damping of this residual causes the dependence of ion thermal transport on the ion-ion collision frequency even in regimes where the instabilities are collisionless.

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418 Kilobytes pages

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INIS; OSTI as DE00751257

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  • Other Information: PBD: 15 Feb 2000

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  • Report No.: PPPL--3437
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/751257 | External Link
  • Office of Scientific & Technical Information Report Number: 751257
  • Archival Resource Key: ark:/67531/metadc708968

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  • February 15, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 15, 2016, 7:33 p.m.

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Lin, Z.; Hahm, T.S.; Lee, W.W.; Tang, W.M. & White, R.B. Gyrokinetic simulations in general geometry and applications to collisional damping of zonal flows, report, February 15, 2000; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc708968/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.