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Title: Particle transport in low-collisionality H-mode plasmas on DIII-D

Abstract

In this article we show that changing from an ion temperature gradient (ITG) to trapped electron mode (TEM) dominant turbulence regime (based on linear gyrokinetic simulations) results experimentally in a strong density pump-out (defined as a reduction in line-averaged density) in low collisionality, low power H-mode plasmas. We vary the turbulence drive by changing the heating from pre-dominantly ion heatedusing neutral beam injection to electron heated using electron cyclotron heating, which changes the Te/Ti ratio and the temperature gradients. Perturbed gas puff experiments show an increase in transport outside ρ = 0.6, through a strong increase in the perturbed diffusion coefficient and a decrease in the inward pinch. Linear gyrokinetic simulations with TGLF show an increase in the particle flux outside the mid-radius. In conjunction an increase in intermediate-scale length density fluctuations is observed, which indicates an increase in turbulence intensity at typical TEM wavelengths. However, although the experimental changes in particle transport agree with a change from ITG to TEM turbulence regimes, we do not observe a reduction in the core rotation at mid-radius, nor a rotation reversal.

Authors:
 [1];  [1];  [2];  [2];  [2];  [2];  [3];  [3];  [3];  [4];  [5];  [5];  [6];  [6];  [7];  [7];  [8]
  1. College of William and Mary, Williamsburg, VA (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. General Atomics, San Diego, CA (United States)
  4. National Fusion Research Institute, Daejeon (South Korea)
  5. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  6. VTT Technical Research Centre of Finland, Espoo (Finland)
  7. Univ. of California San Diego, La Jolla, CA (United States)
  8. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
College of William and Mary, Williamsburg, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1345359
Alternate Identifier(s):
OSTI ID: 1238871
Grant/Contract Number:  
FC02-04ER54698; SC0007880; FG02-08ER54984; AC02-09CH11466; FG02-07ER54917; FG02-89ER53296; FG02-08ER54999; DAE-FG02-07ER54917; AC2-09CH11466; FG0-08ER54984; FSC0007880
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 55; Journal Issue: 11; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; transport properties; particle flux; Tokamaks

Citation Formats

Mordijck, Saskia, Wang, Xin, Doyle, Edward J., Rhodes, Terry L., Schmitz, Lothar, Zeng, Lei, Staebler, Gary M., Petty, Clinton C., Groebner, Richard J., Ko, W. -H., Grierson, Brian A., Solomon, Wayne M., Tala, Tuomas, Salmi, Antti, Chrystal, Colin, Diamond, P. H., and McKee, George R.. Particle transport in low-collisionality H-mode plasmas on DIII-D. United States: N. p., 2015. Web. https://doi.org/10.1088/0029-5515/55/11/113025.
Mordijck, Saskia, Wang, Xin, Doyle, Edward J., Rhodes, Terry L., Schmitz, Lothar, Zeng, Lei, Staebler, Gary M., Petty, Clinton C., Groebner, Richard J., Ko, W. -H., Grierson, Brian A., Solomon, Wayne M., Tala, Tuomas, Salmi, Antti, Chrystal, Colin, Diamond, P. H., & McKee, George R.. Particle transport in low-collisionality H-mode plasmas on DIII-D. United States. https://doi.org/10.1088/0029-5515/55/11/113025
Mordijck, Saskia, Wang, Xin, Doyle, Edward J., Rhodes, Terry L., Schmitz, Lothar, Zeng, Lei, Staebler, Gary M., Petty, Clinton C., Groebner, Richard J., Ko, W. -H., Grierson, Brian A., Solomon, Wayne M., Tala, Tuomas, Salmi, Antti, Chrystal, Colin, Diamond, P. H., and McKee, George R.. Mon . "Particle transport in low-collisionality H-mode plasmas on DIII-D". United States. https://doi.org/10.1088/0029-5515/55/11/113025. https://www.osti.gov/servlets/purl/1345359.
@article{osti_1345359,
title = {Particle transport in low-collisionality H-mode plasmas on DIII-D},
author = {Mordijck, Saskia and Wang, Xin and Doyle, Edward J. and Rhodes, Terry L. and Schmitz, Lothar and Zeng, Lei and Staebler, Gary M. and Petty, Clinton C. and Groebner, Richard J. and Ko, W. -H. and Grierson, Brian A. and Solomon, Wayne M. and Tala, Tuomas and Salmi, Antti and Chrystal, Colin and Diamond, P. H. and McKee, George R.},
abstractNote = {In this article we show that changing from an ion temperature gradient (ITG) to trapped electron mode (TEM) dominant turbulence regime (based on linear gyrokinetic simulations) results experimentally in a strong density pump-out (defined as a reduction in line-averaged density) in low collisionality, low power H-mode plasmas. We vary the turbulence drive by changing the heating from pre-dominantly ion heatedusing neutral beam injection to electron heated using electron cyclotron heating, which changes the Te/Ti ratio and the temperature gradients. Perturbed gas puff experiments show an increase in transport outside ρ = 0.6, through a strong increase in the perturbed diffusion coefficient and a decrease in the inward pinch. Linear gyrokinetic simulations with TGLF show an increase in the particle flux outside the mid-radius. In conjunction an increase in intermediate-scale length density fluctuations is observed, which indicates an increase in turbulence intensity at typical TEM wavelengths. However, although the experimental changes in particle transport agree with a change from ITG to TEM turbulence regimes, we do not observe a reduction in the core rotation at mid-radius, nor a rotation reversal.},
doi = {10.1088/0029-5515/55/11/113025},
journal = {Nuclear Fusion},
number = 11,
volume = 55,
place = {United States},
year = {2015},
month = {10}
}

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Works referenced in this record:

Principal physics developments evaluated in the ITER design review
journal, May 2009


Simulations of density profiles, pellet fuelling and density control in ITER
journal, November 2011


Density Peaking, Anomalous Pinch, and Collisionality in Tokamak Plasmas
journal, May 2003


Off-diagonal particle and toroidal momentum transport: a survey of experimental, theoretical and modelling aspects
journal, October 2012


Density response to central electron heating: theoretical investigations and experimental observations in ASDEX Upgrade
journal, June 2004


Turbulent Particle Transport in Magnetized Plasmas
journal, July 2003


Observation of Spontaneous Toroidal Rotation Inversion in Ohmically Heated Tokamak Plasmas
journal, December 2006


Core intrinsic rotation behaviour in ASDEX Upgrade ohmic L-mode plasmas
journal, March 2014


Multi-channel transport experiments at Alcator C-Mod and comparison with gyrokinetic simulations
journal, May 2013

  • White, A. E.; Howard, N. T.; Greenwald, M.
  • Physics of Plasmas, Vol. 20, Issue 5
  • DOI: 10.1063/1.4803089

A design retrospective of the DIII-D tokamak
journal, May 2002


Changes in particle transport as a result of resonant magnetic perturbations in DIII-D
journal, May 2012

  • Mordijck, S.; Doyle, E. J.; McKee, G. R.
  • Physics of Plasmas, Vol. 19, Issue 5
  • DOI: 10.1063/1.4718316

Determination of particle transport coefficients in reversed shear plasma of JT-60U
journal, February 1998


Influence of the resonant magnetic perturbations on transport in the Large Helical Device
journal, September 2013


Perturbative measurements of the electron transport matrix using ICRF power modulation
journal, October 1992


Determination of particle transport coefficients in ASDEX by gas modulation
journal, February 1992


Perturbative transport studies in fusion plasmas
journal, August 1995


Determination of diffusive and nondiffusive transport in modulation experiments in plasmas
journal, November 1991

  • Jacchia, A.; Mantica, P.; De Luca, F.
  • Physics of Fluids B: Plasma Physics, Vol. 3, Issue 11
  • DOI: 10.1063/1.859781

A theory-based transport model with comprehensive physics
journal, May 2007

  • Staebler, G. M.; Kinsey, J. E.; Waltz, R. E.
  • Physics of Plasmas, Vol. 14, Issue 5
  • DOI: 10.1063/1.2436852

A multichannel, frequency-modulated, tunable Doppler backscattering and reflectometry system
journal, August 2009

  • Hillesheim, J. C.; Peebles, W. A.; Rhodes, T. L.
  • Review of Scientific Instruments, Vol. 80, Issue 8
  • DOI: 10.1063/1.3205449

Ion temperature gradient turbulence simulations and plasma flux surface shape
journal, November 1999

  • Waltz, R. E.; Miller, R. L.
  • Physics of Plasmas, Vol. 6, Issue 11
  • DOI: 10.1063/1.873694

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