Self-consistent particle tracking in a simulation of the entropy mode in a Z pinch

K. Gustafson; I. Broemstrup; D. Del-Castillo-Negrete; W. Dorland; M. Barnes

doi:10.1063/1.3033713

Self-consistent particle tracking in a simulation of the entropy mode in a Z pinch

K. Gustafson, I. Broemstrup, D. Del-Castillo-Negrete, W. Dorland, M. Barnes

Plasma Theory and Modeling

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

A single particle tracking technique for studying nondiffusive transport is implemented in a new particle-in-cell gyrokinetic simulation of the entropy mode in a Z pinch geometry. Radial transport is characterized in terms of the time dependence of the variance of displacements. The vertical zonal flow dynamics of the nonlinear phase of the instability seem to cause subdiffusive transport for ions during the simulation lengths used here. Electrons follow subdiffusive transport, except for later times in the case of the largest gradient, where the transport becomes superdiffusive. The probability distribution of displacements shows a positive skew and long tails relative to the Gaussian distribution for both ions and electrons.

Original language	English
Title of host publication	Theory of Fusion Plasmas - Joint Varenna-Lausanne International Workshop
Editors	Olivier Sauter, Elio Sindoni, Xavier Garbet
Publisher	American Institute of Physics Inc.
Pages	277-282
Number of pages	6
ISBN (Electronic)	9780735406001
DOIs	https://doi.org/10.1063/1.3033713
State	Published - 2008
Event	Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas - Varenna, Italy Duration: Aug 25 2008 → Aug 29 2008

Publication series

Name	AIP Conference Proceedings
Volume	1069
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas
Country/Territory	Italy
City	Varenna
Period	08/25/08 → 08/29/08

Funding

This work is supported by the Fannie and John Hertz Foundation and the U.S. Department of Energy through the Center for Multiscale Plasma Dynamics. D. del-CastiUo-Negrete acknowledges support from the Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725

Funders	Funder number
Center for Multiscale Plasma Dynamics
U.S. Department of Energy
Hertz Foundation
Oak Ridge National Laboratory	DE-AC05-00OR22725

Keywords

Gyrokinetics
Z pinch
entropy mode
microturbulence
nondiffusive transport

Access to Document

10.1063/1.3033713

Cite this

Gustafson, K., Broemstrup, I., Del-Castillo-Negrete, D., Dorland, W., & Barnes, M. (2008). Self-consistent particle tracking in a simulation of the entropy mode in a Z pinch. In O. Sauter, E. Sindoni, & X. Garbet (Eds.), Theory of Fusion Plasmas - Joint Varenna-Lausanne International Workshop (pp. 277-282). (AIP Conference Proceedings; Vol. 1069). American Institute of Physics Inc.. https://doi.org/10.1063/1.3033713

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abstract = "A single particle tracking technique for studying nondiffusive transport is implemented in a new particle-in-cell gyrokinetic simulation of the entropy mode in a Z pinch geometry. Radial transport is characterized in terms of the time dependence of the variance of displacements. The vertical zonal flow dynamics of the nonlinear phase of the instability seem to cause subdiffusive transport for ions during the simulation lengths used here. Electrons follow subdiffusive transport, except for later times in the case of the largest gradient, where the transport becomes superdiffusive. The probability distribution of displacements shows a positive skew and long tails relative to the Gaussian distribution for both ions and electrons.",

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Gustafson, K, Broemstrup, I, Del-Castillo-Negrete, D, Dorland, W & Barnes, M 2008, Self-consistent particle tracking in a simulation of the entropy mode in a Z pinch. in O Sauter, E Sindoni & X Garbet (eds), Theory of Fusion Plasmas - Joint Varenna-Lausanne International Workshop. AIP Conference Proceedings, vol. 1069, American Institute of Physics Inc., pp. 277-282, Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas, Varenna, Italy, 08/25/08. https://doi.org/10.1063/1.3033713

Self-consistent particle tracking in a simulation of the entropy mode in a Z pinch. / Gustafson, K.; Broemstrup, I.; Del-Castillo-Negrete, D. et al.
Theory of Fusion Plasmas - Joint Varenna-Lausanne International Workshop. ed. / Olivier Sauter; Elio Sindoni; Xavier Garbet. American Institute of Physics Inc., 2008. p. 277-282 (AIP Conference Proceedings; Vol. 1069).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AB - A single particle tracking technique for studying nondiffusive transport is implemented in a new particle-in-cell gyrokinetic simulation of the entropy mode in a Z pinch geometry. Radial transport is characterized in terms of the time dependence of the variance of displacements. The vertical zonal flow dynamics of the nonlinear phase of the instability seem to cause subdiffusive transport for ions during the simulation lengths used here. Electrons follow subdiffusive transport, except for later times in the case of the largest gradient, where the transport becomes superdiffusive. The probability distribution of displacements shows a positive skew and long tails relative to the Gaussian distribution for both ions and electrons.

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Gustafson K, Broemstrup I, Del-Castillo-Negrete D, Dorland W, Barnes M. Self-consistent particle tracking in a simulation of the entropy mode in a Z pinch. In Sauter O, Sindoni E, Garbet X, editors, Theory of Fusion Plasmas - Joint Varenna-Lausanne International Workshop. American Institute of Physics Inc. 2008. p. 277-282. (AIP Conference Proceedings). doi: 10.1063/1.3033713

Self-consistent particle tracking in a simulation of the entropy mode in a Z pinch

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