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

Abstract

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-hoc models 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 tokamak transport 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 modemore » stability through the analysis of the power exchanged between energetic particles and the instabilities.« less

Authors:
; ; ;  [1]
  1. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States)
Publication Date:
OSTI Identifier:
22600237
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; Other Information: (c) 2016 Author(s); 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; COMPUTERIZED SIMULATION; CORRELATIONS; DISTRIBUTION; DISTRIBUTION FUNCTIONS; DISTURBANCES; FOCUSING; IONS; MODIFICATIONS; PARTICLE INTERACTIONS; PARTICLES; PERTURBATION THEORY; PHASE SPACE; PLASMA; PLASMA INSTABILITY; TOKAMAK DEVICES; TRANSPORT THEORY

Citation Formats

Podestà, M., E-mail: mpodesta@pppl.gov, 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.
Podestà, M., E-mail: mpodesta@pppl.gov, Gorelenkova, M., Fredrickson, E. D., Gorelenkov, N. N., & White, R. B. Phase space effects on fast ion distribution function modeling in tokamaks. United States. doi:10.1063/1.4946027.
Podestà, M., E-mail: mpodesta@pppl.gov, Gorelenkova, M., Fredrickson, E. D., Gorelenkov, N. N., and White, R. B. Sun . "Phase space effects on fast ion distribution function modeling in tokamaks". United States. doi:10.1063/1.4946027.
@article{osti_22600237,
title = {Phase space effects on fast ion distribution function modeling in tokamaks},
author = {Podestà, M., E-mail: mpodesta@pppl.gov and Gorelenkova, M. and Fredrickson, E. D. and Gorelenkov, N. N. and White, R. B.},
abstractNote = {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-hoc models 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 tokamak transport 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},
issn = {1070-664X},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {5}
}

Works referenced in this record:

Phase space effects on fast ion distribution function modeling in tokamaks
dataset, April 2016

  • White, R. B.; Podesta, M.; Gorelenkova, M.
  • AIP Physics of Plasmas, Vol. 23, Issue 5, 869.81 kB
  • DOI: 10.11578/1366480

    Works referencing / citing this record:

    Phase space effects on fast ion distribution function modeling in tokamaks
    dataset, April 2016

    • White, R. B.; Podesta, M.; Gorelenkova, M.
    • AIP Physics of Plasmas, Vol. 23, Issue 5, 869.81 kB
    • DOI: 10.11578/1366480