skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

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 » the analysis of the power exchanged between energetic particles and the instabilities.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (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.
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. doi:10.1063/1.4946027.
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. doi:10.1063/1.4946027. https://www.osti.gov/servlets/purl/1254686.
@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 = {2016},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1: 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.

Save / Share:

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

Linearized gyrofluid model of the alpha‐destabilized toroidal Alfvén eigenmode with continuum damping effects
journal, October 1992

  • Spong, D. A.; Carreras, B. A.; Hedrick, C. L.
  • Physics of Fluids B: Plasma Physics, Vol. 4, Issue 10
  • DOI: 10.1063/1.860386

Fast-ion energy loss during TAE avalanches in the National Spherical Torus Experiment
journal, December 2012


A reduced fast ion transport model for the tokamak transport code TRANSP
journal, April 2014


Nonlocal energetic particle mode in a JT-60U plasma
journal, January 2005

  • Todo, Y.; Shinohara, K.; Takechi, M.
  • Physics of Plasmas, Vol. 12, Issue 1
  • DOI: 10.1063/1.1828084

Hamiltonian guiding center drift orbit calculation for plasmas of arbitrary cross section
journal, January 1984

  • White, R. B.; Chance, M. S.
  • Physics of Fluids, Vol. 27, Issue 10
  • DOI: 10.1063/1.864527

New techniques for calculating heat and particle source rates due to neutral beam injection in axisymmetric tokamaks
journal, September 1981


Hybrid magnetohydrodynamic‐gyrokinetic simulation of toroidal Alfvén modes
journal, October 1995

  • Briguglio, S.; Vlad, G.; Zonca, F.
  • Physics of Plasmas, Vol. 2, Issue 10
  • DOI: 10.1063/1.871071

Neutral particle analyzer diagnostic on the National Spherical Torus Experiment
journal, October 2004

  • Medley, S. S.; Roquemore, A. L.
  • Review of Scientific Instruments, Vol. 75, Issue 10
  • DOI: 10.1063/1.1788859

Millimeter-wave reflectometry for electron density profile and fluctuation measurements on NSTX
journal, January 2001

  • Kubota, S.; Nguyen, X. V.; Peebles, W. A.
  • Review of Scientific Instruments, Vol. 72, Issue 1
  • DOI: 10.1063/1.1329657

Fast particle finite orbit width and Larmor radius effects on low- n toroidicity induced Alfvén eigenmode excitation
journal, July 1999

  • Gorelenkov, N. N.; Cheng, C. Z.; Fu, G. Y.
  • Physics of Plasmas, Vol. 6, Issue 7
  • DOI: 10.1063/1.873545

Overview of the physics and engineering design of NSTX upgrade
journal, July 2012


Energetic particle physics in fusion research in preparation for burning plasma experiments
journal, November 2014


Particle distribution modification by low amplitude modes
journal, March 2010


1.5D quasilinear model and its application on beams interacting with Alfvén eigenmodes in DIII-D
journal, September 2012

  • Ghantous, K.; Gorelenkov, N. N.; Berk, H. L.
  • Physics of Plasmas, Vol. 19, Issue 9
  • DOI: 10.1063/1.4752011

Stability of the toroidicity‐induced Alfvén eigenmode in axisymmetric toroidal equilibria
journal, November 1993

  • Fu, G. Y.; Cheng, C. Z.; Wong, K. L.
  • Physics of Fluids B: Plasma Physics, Vol. 5, Issue 11
  • DOI: 10.1063/1.860572

Gyrokinetic δf particle simulations of toroidicity-induced Alfvén eigenmode
journal, October 2009

  • Lang, Jianying; Chen, Yang; Parker, Scott E.
  • Physics of Plasmas, Vol. 16, Issue 10
  • DOI: 10.1063/1.3243493

Simulations of beam ion transport during tearing modes in the DIII-D tokamak
journal, July 2002


The behaviour of fast ions in tokamak experiments
journal, February 1995


Exploration of spherical torus physics in the NSTX device
journal, March 2000


Modeling fast-ion transport during toroidal Alfvén eigenmode avalanches in National Spherical Torus Experiment
journal, December 2009

  • Fredrickson, E. D.; Crocker, N. A.; Bell, R. E.
  • Physics of Plasmas, Vol. 16, Issue 12
  • DOI: 10.1063/1.3265965

Multi-mode Alfvénic fast particle transport and losses: numerical versus experimental observation
journal, November 2013


High spatial sampling global mode structure measurements via multichannel reflectometry in NSTX
journal, August 2011


Chapter 5: Physics of energetic ions
journal, June 2007


Plasma simulation studies using multilevel physics models
journal, May 1999

  • Park, W.; Belova, E. V.; Fu, G. Y.
  • Physics of Plasmas, Vol. 6, Issue 5
  • DOI: 10.1063/1.873437

The tokamak Monte Carlo fast ion module NUBEAM in the National Transport Code Collaboration library
journal, June 2004

  • Pankin, Alexei; McCune, Douglas; Andre, Robert
  • Computer Physics Communications, Vol. 159, Issue 3
  • DOI: 10.1016/j.cpc.2003.11.002

Kinetic extensions of magnetohydrodynamics for axisymmetric toroidal plasmas
journal, February 1992


The effect of the fast-ion profile on Alfvén eigenmode stability
journal, August 2013


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

  • Podesta, M.; Gorelenkova, M.; Fredrickson, E.
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1562030

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

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

    • Podesta, M.; Gorelenkova, M.; Fredrickson, E.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1562030