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

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4946027· OSTI ID:1254686
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
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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.

Research Organization:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-09CH11466
OSTI ID:
1254686
Report Number(s):
PPPL-5218; PHPAEN
Journal Information:
Physics of Plasmas, Vol. 23, Issue 5; Related Information: The digital data for this paper can be found in http://arks.princeton.edu.ezproxy.princeton.edu/ark:/88435/dsp018p58pg29; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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Cited By (6)

Integrated Tokamak modeling: When physics informs engineering and research planning journal May 2018
Effects of energetic particle phase space modifications by instabilities on integrated modeling journal July 2016
Energetic particles in spherical tokamak plasmas journal March 2017
Resonance broadened quasi-linear (RBQ) model for fast ion distribution relaxation due to Alfvénic eigenmodes journal June 2018
Phase space effects on fast ion distribution function modeling in tokamaks dataset January 2016
Phase space effects on fast ion distribution function modeling in tokamaks dataset April 2016

Figures / Tables (11)

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
magnetohydrodynamics
tokamaks
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transport phenomena
wave interaction
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neutrons
instability analysis
plasma transport properties