Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma

Zhu, Hongxuan; Stoltzfus-Dueck, T; Hager, R; Ku, S; Chang, C.S.

doi:10.34770/hj83-n134

Title: Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma

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Princeton Plasma Physics Laboratory; Princeton Plasma Physics Laboratory
Princeton Plasma Physics Laboratory

Publication Date:: Sun Jan 01 04:00:00 UTC 2023

DOE Contract Number:: AC02-05CH11231; AC02-09CH11466

Research Org.:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

Subject:: gyrokinetic simulations; ion orbit loss; radial electric field; tokamak edge plasmas

OSTI Identifier:: 2001094

DOI:: https://doi.org/10.34770/hj83-n134

Citation Formats


                    Zhu, Hongxuan, Stoltzfus-Dueck, T, Hager, R, Ku, S, and Chang, C.S. Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma.  United States: N. p., 2023. 
        Web.  doi:10.34770/hj83-n134.

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                    Zhu, Hongxuan, Stoltzfus-Dueck, T, Hager, R, Ku, S, & Chang, C.S. Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma.  United States.  doi:https://doi.org/10.34770/hj83-n134

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                    Zhu, Hongxuan, Stoltzfus-Dueck, T, Hager, R, Ku, S, and Chang, C.S. 2023.  
"Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma".  United States.  doi:https://doi.org/10.34770/hj83-n134.  https://www.osti.gov/servlets/purl/2001094. Pub date:Sun Jan 01 04:00:00 UTC 2023

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@article{osti_2001094,

  title        = {Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma},

  author       = {Zhu, Hongxuan and Stoltzfus-Dueck, T and Hager, R and Ku, S and Chang, C.S.},

  abstractNote = {},

  doi          = {10.34770/hj83-n134},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Sun Jan 01 04:00:00 UTC 2023},

  month        = {Sun Jan 01 04:00:00 UTC 2023}

}

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DOI: https://doi.org/10.34770/hj83-n134

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Effects of collisional ion orbit loss on neoclassical tokamak radial electric fields

Dataset Zhu, Hongxuan ; Stoltzfus-Dueck, T ; Hager, R ; ...

Ion orbit loss is considered important for generating the radially inward electric field Er in a tokamak edge plasma. In particular, this effect is emphasized in diverted tokamaks with a magnetic X point. In neoclassical equilibria, Coulomb collisions can scatter ions onto loss orbits and generate a radially outward current, which in steady state is balanced by the radially inward current from viscosity. To quantitatively measure this loss-orbit current in an edge pedestal, an ion-orbit-flux diagnostic has been implemented in the axisymmetric version of the gyrokinetic particle-in-cell code XGC. As the first application of this diagnostic, a neoclassical DIII-D H-modemore »« less
Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma

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Ion orbit loss has been used to model the formation of a strong negative radial electric field E_r in the tokamak edge, as well as edge momentum transport and toroidal rotation. To quantitatively measure ion orbit loss, an orbit-flux formulation has been developed and numerically applied to the gyrokinetic particle-in-cell code XGC. We study collisional ion orbit loss in an axisymmetric DIII-D L-mode plasma using gyrokinetic ions and drift-kinetic electrons. Numerical simulations, where the plasma density and temperature profiles are maintained through neutral ionization and heating, show the formation of a quasisteady negative E_r in the edge. We have measuredmore »« less
Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma

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Abstract Ion orbit loss has been used to model the formation of a strong negative radial electric field E _r in the tokamak edge, as well as edge momentum transport and toroidal rotation. To quantitatively measure ion orbit loss, an orbit-flux formulation has been developed and numerically applied to the gyrokinetic particle-in-cell code XGC. We study collisional ion orbit loss in an axisymmetric DIII-D L-mode plasma using gyrokinetic ions and drift-kinetic electrons. Numerical simulations, where the plasma density and temperature profiles are maintained through neutral ionization and heating, show the formation of a quasisteady negative E _rmore » in the edge. We have measured a radially outgoing ion gyrocenter flux due to collisional scattering of ions into the loss orbits, which is balanced by the radially incoming ion gyrocenter flux from confined orbits on the collisional time scale. This suggests that collisional ion orbit loss can shift E _r in the negative direction compared to that in plasmas without orbit loss. It is also found that collisional ion orbit loss can contribute to a radially outgoing (counter-current) toroidal-angular-momentum flux, which is not balanced by the toroidal-angular-momentum flux carried by ions on the confined orbits. Therefore, the edge toroidal rotation shifts in the co-current direction on the collisional time scale.« less
Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma

Journal Article Zhu, Hongxuan ; Stoltzfus-Dueck, Timothy ; Hager, R. ; ... - Nuclear Fusion

Abstract Ion orbit loss has been used to model the formation of a strong negative radial electric field E _r in the tokamak edge, as well as edge momentum transport and toroidal rotation. To quantitatively measure ion orbit loss, an orbit-flux formulation has been developed and numerically applied to the gyrokinetic particle-in-cell code XGC. We study collisional ion orbit loss in an axisymmetric DIII-D L-mode plasma using gyrokinetic ions and drift-kinetic electrons. Numerical simulations, where the plasma density and temperature profiles are maintained through neutral ionization and heating, show the formation of a quasisteady negative E _r in the edge.more »« less
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Journal Article Zhu, Hongxuan ; Stoltzfus-Dueck, T. ; Hager, R. ; ... - Nuclear Fusion

We report that ion orbit loss is considered important for generating the radially inward electric field E_r in a tokamak edge plasma. In particular, this effect is emphasized in diverted tokamaks with a magnetic X point. In neoclassical equilibria, Coulomb collisions can scatter ions onto loss orbits and generate a radially outward current, which in steady state is balanced by the radially inward current from viscosity. To quantitatively measure this loss-orbit current in an edge pedestal, an ion-orbit-flux diagnostic has been implemented in the axisymmetric version of the gyrokinetic particle-in-cell code XGC. As the first application of this diagnostic, amore »« less

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