Phase space effects on fast ion distribution function modeling in tokamaks

Podesta, M.; Gorelenkova, M.; Fredrickson, E. D.; Gorelenkov, N. N.; White, R. B.

doi:10.1063/1.4946027

Title: Phase space effects on fast ion distribution function modeling in tokamaks

Abstract

Here, integrated simulations of tokamak discharges typically rely on classical physics to model energetic particle (EP) dynamics. However, there are numerous cases in which energetic particles can suffer additional transport that is not classical in nature. Examples include transport by applied 3D magnetic perturbations and, more notably, by plasma instabilities. Focusing on the effects of instabilities,ad-hocmodels can empirically reproduce increased transport, but the choice of transport coefficients is usually somehow arbitrary. New approaches based on physics-based reduced models are being developed to address those issues in a simplified way, while retaining a more correct treatment of resonant wave-particle interactions. The kick model implemented in the tokamaktransport code TRANSP is an example of such reduced models. It includes modifications of the EP distribution by instabilities in real and velocity space, retaining correlations between transport in energy and space typical of resonant EP transport. The relevance of EP phase space modifications by instabilities is first discussed in terms of predicted fast ion distribution. Results are compared with those from a simple, ad-hoc diffusive model. It is then shown that the phase-space resolved model can also provide additional insight into important issues such as internal consistency of the simulations and mode stability throughmore »« less

Authors:

^[1]; Gorelenkova, M. ^[1]; Fredrickson, E. D. ^[1]; Gorelenkov, N. N. ^[1];

^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Publication Date:: Thu Apr 14 00:00:00 EDT 2016

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

Sponsoring Org.:: USDOE

OSTI Identifier:: 1254686

Report Number(s):: PPPL-5218
Journal ID: ISSN 1070-664X; PHPAEN

Grant/Contract Number:: AC02-09CH11466

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 23; Journal Issue: 5; Related Information: The digital data for this paper can be found in http://arks.princeton.edu.ezproxy.princeton.edu/ark:/88435/dsp018p58pg29; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetohydrodynamics; tokamaks, NSTX; transport phenomena; wave interaction; particles; phase space methods; particle distribution functions; neutrons; instability analysis; plasma transport properties

Citation Formats


                    Podesta, M., Gorelenkova, M., Fredrickson, E. D., Gorelenkov, N. N., and White, R. B. Phase space effects on fast ion distribution function modeling in tokamaks.  United States: N. p., 2016. 
Web.  doi:10.1063/1.4946027.

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                    Podesta, M., Gorelenkova, M., Fredrickson, E. D., Gorelenkov, N. N., & White, R. B. Phase space effects on fast ion distribution function modeling in tokamaks.  United States.  https://doi.org/10.1063/1.4946027

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                    Podesta, M., Gorelenkova, M., Fredrickson, E. D., Gorelenkov, N. N., and White, R. B. Thu .  
"Phase space effects on fast ion distribution function modeling in tokamaks".  United States.  https://doi.org/10.1063/1.4946027.  https://www.osti.gov/servlets/purl/1254686.

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@article{osti_1254686,

  title        = {Phase space effects on fast ion distribution function modeling in tokamaks},

  author       = {Podesta, M. and Gorelenkova, M. and Fredrickson, E. D. and Gorelenkov, N. N. and White, R. B.},

  abstractNote = {Here, integrated simulations of tokamak discharges typically rely on classical physics to model energetic particle (EP) dynamics. However, there are numerous cases in which energetic particles can suffer additional transport that is not classical in nature. Examples include transport by applied 3D magnetic perturbations and, more notably, by plasma instabilities. Focusing on the effects of instabilities,ad-hocmodels can empirically reproduce increased transport, but the choice of transport coefficients is usually somehow arbitrary. New approaches based on physics-based reduced models are being developed to address those issues in a simplified way, while retaining a more correct treatment of resonant wave-particle interactions. The kick model implemented in the tokamaktransport code TRANSP is an example of such reduced models. It includes modifications of the EP distribution by instabilities in real and velocity space, retaining correlations between transport in energy and space typical of resonant EP transport. The relevance of EP phase space modifications by instabilities is first discussed in terms of predicted fast ion distribution. Results are compared with those from a simple, ad-hoc diffusive model. It is then shown that the phase-space resolved model can also provide additional insight into important issues such as internal consistency of the simulations and mode stability through the analysis of the power exchanged between energetic particles and the instabilities.},

  doi          = {10.1063/1.4946027},

  journal      = {Physics of Plasmas},

  number       = 5,

  volume       = 23,

  place        = {United States},

  year         = {Thu Apr 14 00:00:00 EDT 2016},

  month        = {Thu Apr 14 00:00:00 EDT 2016}

}

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Figures / Tables:

FIG. 1:: Frequency spectrum of magnetic fluctuatens from Mirnov coils installed at the low-field side vessel awl for NSTX discharge #139048. Toroidal mode numbers of the different instabilities are indicated in the figure.

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