Gyrokinetic modelling of stationary electron and impurity profiles in tokamaks

doi:10.1063/1.4894739

Title: Gyrokinetic modelling of stationary electron and impurity profiles in tokamaks

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Abstract

Particle transport due to Ion Temperature Gradient (ITG)/Trapped Electron Mode (TEM) turbulence is investigated using the gyrokinetic code GENE. Both a reduced quasilinear treatment and nonlinear simulations are performed for typical tokamak parameters corresponding to ITG dominated turbulence. The gyrokinetic results are compared and contrasted with results from a computationally efficient fluid model. A selfconsistent treatment is used, where the stationary local profiles are calculated corresponding to zero particle flux simultaneously for electrons and trace impurities. The scaling of the stationary profiles with magnetic shear, safety factor, electron-to-ion temperature ratio, collisionality, toroidal sheared rotation, plasma β, triangularity, and elongation is investigated. In addition, the effect of different main ion mass on the zero flux condition is discussed. The electron density gradient can significantly affect the stationary impurity profile scaling. It is therefore expected that a selfconsistent treatment will yield results more comparable to experimental results for parameter scans where the stationary background density profile is sensitive. This is shown to be the case in scans over magnetic shear, collisionality, elongation, and temperature ratio, for which the simultaneous zero flux electron and impurity profiles are calculated. A slight asymmetry between hydrogen, deuterium, and tritium with respect to profile peaking is obtained,more »« less

Authors:

Skyman, A., E-mail: andreas.skyman@chalmers.se; Tegnered, D., E-mail: tegnered@chalmers.se; Nordman, H., E-mail: hans.nordman@chalmers.se; Strand, P., E-mail: par.strand@chalmers.se ^[1]

Euratom–VR Association, Department of Earth and Space Sciences, Chalmers University of Technology, SE-412 96 Göteborg (Sweden)

Publication Date:: Mon Sep 15 00:00:00 EDT 2014

OSTI Identifier:: 22303629

Resource Type:: Journal Article

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 21; Journal Issue: 9; Other Information: (c) 2014 EURATOM; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPARATIVE EVALUATIONS; DEUTERIUM; ELONGATION; HYDROGEN; NONLINEAR PROBLEMS; PLASMA; PLASMA IMPURITIES; SHEAR; SIMULATION; TEMPERATURE GRADIENTS; TOKAMAK DEVICES; TRANSMISSION ELECTRON MICROSCOPY; TRAPPED ELECTRONS; TRITIUM

Citation Formats


                    Skyman, A., E-mail: andreas.skyman@chalmers.se, Tegnered, D., E-mail: tegnered@chalmers.se, Nordman, H., E-mail: hans.nordman@chalmers.se, and Strand, P., E-mail: par.strand@chalmers.se. Gyrokinetic modelling of stationary electron and impurity profiles in tokamaks.  United States: N. p., 2014. 
        Web.  doi:10.1063/1.4894739.

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                    Skyman, A., E-mail: andreas.skyman@chalmers.se, Tegnered, D., E-mail: tegnered@chalmers.se, Nordman, H., E-mail: hans.nordman@chalmers.se, & Strand, P., E-mail: par.strand@chalmers.se. Gyrokinetic modelling of stationary electron and impurity profiles in tokamaks.  United States.  https://doi.org/10.1063/1.4894739

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                    Skyman, A., E-mail: andreas.skyman@chalmers.se, Tegnered, D., E-mail: tegnered@chalmers.se, Nordman, H., E-mail: hans.nordman@chalmers.se, and Strand, P., E-mail: par.strand@chalmers.se. 2014.  
        "Gyrokinetic modelling of stationary electron and impurity profiles in tokamaks".  United States.  https://doi.org/10.1063/1.4894739.

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@article{osti_22303629,

  title        = {Gyrokinetic modelling of stationary electron and impurity profiles in tokamaks},

  author       = {Skyman, A., E-mail: andreas.skyman@chalmers.se and Tegnered, D., E-mail: tegnered@chalmers.se and Nordman, H., E-mail: hans.nordman@chalmers.se and Strand, P., E-mail: par.strand@chalmers.se},

  abstractNote = {Particle transport due to Ion Temperature Gradient (ITG)/Trapped Electron Mode (TEM) turbulence is investigated using the gyrokinetic code GENE. Both a reduced quasilinear treatment and nonlinear simulations are performed for typical tokamak parameters corresponding to ITG dominated turbulence. The gyrokinetic results are compared and contrasted with results from a computationally efficient fluid model. A selfconsistent treatment is used, where the stationary local profiles are calculated corresponding to zero particle flux simultaneously for electrons and trace impurities. The scaling of the stationary profiles with magnetic shear, safety factor, electron-to-ion temperature ratio, collisionality, toroidal sheared rotation, plasma β, triangularity, and elongation is investigated. In addition, the effect of different main ion mass on the zero flux condition is discussed. The electron density gradient can significantly affect the stationary impurity profile scaling. It is therefore expected that a selfconsistent treatment will yield results more comparable to experimental results for parameter scans where the stationary background density profile is sensitive. This is shown to be the case in scans over magnetic shear, collisionality, elongation, and temperature ratio, for which the simultaneous zero flux electron and impurity profiles are calculated. A slight asymmetry between hydrogen, deuterium, and tritium with respect to profile peaking is obtained, in particular, for scans in collisionality and temperature ratio.},

  doi          = {10.1063/1.4894739},

  url          = {https://www.osti.gov/biblio/22303629},
  journal      = {Physics of Plasmas},

  issn         = {1070-664X},

  number       = 9,

  volume       = 21,

  place        = {United States},

  year         = {Mon Sep 15 00:00:00 EDT 2014},

  month        = {Mon Sep 15 00:00:00 EDT 2014}

}

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