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Title: Neutral recycling effects on ITG turbulence

Abstract

Here, the effects of recycled neutral atoms on tokamak ion temperature gradient (ITG) driven turbulence have been investigated in a steep edge pedestal, magnetic separatrix configuration, with the full-f edge gryokinetic code XGC1. An adiabatic electron model has been used; hence, the impacts of neutral particles and turbulence on the density gradient are not considered, nor are electromagnetic turbulence effects. The neutral atoms enhance the ITG turbulence, first, by increasing the ion temperature gradient in the pedestal via the cooling effects of charge exchange and, second, by a relative reduction in the $$E\times B$$ shearing rate.

Authors:
ORCiD logo [1];  [2];  [1];  [1];  [1]
  1. Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab.
  2. Intel Corp., Santa Clara, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1373269
Grant/Contract Number:  
AC02-05CH11231; AC02-09CH11466; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 8; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; gyrokinetic simulation; plasma turbulence; neutral recycling; tokamak; FEC 2016

Citation Formats

Stotler, D. P., Lang, J., Chang, C. S., Churchill, R. M., and Ku, S. Neutral recycling effects on ITG turbulence. United States: N. p., 2017. Web. doi:10.1088/1741-4326/aa7807.
Stotler, D. P., Lang, J., Chang, C. S., Churchill, R. M., & Ku, S. Neutral recycling effects on ITG turbulence. United States. doi:10.1088/1741-4326/aa7807.
Stotler, D. P., Lang, J., Chang, C. S., Churchill, R. M., and Ku, S. Tue . "Neutral recycling effects on ITG turbulence". United States. doi:10.1088/1741-4326/aa7807. https://www.osti.gov/servlets/purl/1373269.
@article{osti_1373269,
title = {Neutral recycling effects on ITG turbulence},
author = {Stotler, D. P. and Lang, J. and Chang, C. S. and Churchill, R. M. and Ku, S.},
abstractNote = {Here, the effects of recycled neutral atoms on tokamak ion temperature gradient (ITG) driven turbulence have been investigated in a steep edge pedestal, magnetic separatrix configuration, with the full-f edge gryokinetic code XGC1. An adiabatic electron model has been used; hence, the impacts of neutral particles and turbulence on the density gradient are not considered, nor are electromagnetic turbulence effects. The neutral atoms enhance the ITG turbulence, first, by increasing the ion temperature gradient in the pedestal via the cooling effects of charge exchange and, second, by a relative reduction in the $E\times B$ shearing rate.},
doi = {10.1088/1741-4326/aa7807},
journal = {Nuclear Fusion},
number = 8,
volume = 57,
place = {United States},
year = {2017},
month = {7}
}

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Works referenced in this record:

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A fully non-linear multi-species Fokker–Planck–Landau collision operator for simulation of fusion plasma
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Neutral Gas Transport Modeling with DEGAS 2
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Energy conservation tests of a coupled kinetic plasma–kinetic neutral transport code
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Kinetic neoclassical transport in the H-mode pedestal
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Origins and spatial distributions of core fueling in the DIII-D tokamak
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Neutral recycling effects on ITG turbulence
dataset, January 2017

  • Stotler, D.; Lang, J.; Chang, C.
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1562077

    Works referencing / citing this record:

    Particle Simulation of Neoclassical Transport in the Plasma Edge
    journal, September 2006


    Neutral Gas Transport Modeling with DEGAS 2
    journal, January 1994


    A Suitable Boundary Condition for Bounded Plasma Simulation without Sheath Resolution
    journal, January 1993

    • Parker, S. E.; Procassini, R. J.; Birdsall, C. K.
    • Journal of Computational Physics, Vol. 104, Issue 1
    • DOI: 10.1006/jcph.1993.1005

    Ionization, recombination, and population of excited levels in hydrogen plasmas
    journal, April 1973

    • Johnson, L. C.; Hinnov, E.
    • Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 13, Issue 4
    • DOI: 10.1016/0022-4073(73)90064-2

    A fully non-linear multi-species Fokker–Planck–Landau collision operator for simulation of fusion plasma
    journal, June 2016


    Effect of neutral atoms on tokamak edge plasmas
    journal, December 2001

    • Fülöp, T.; Catto, Peter J.; Helander, P.
    • Physics of Plasmas, Vol. 8, Issue 12
    • DOI: 10.1063/1.1418241

    Effect of ion-neutral charge exchange on radial electric fields in the edge plasma
    journal, March 2002

    • D’Ippolito, D. A.; Myra, J. R.
    • Physics of Plasmas, Vol. 9, Issue 3
    • DOI: 10.1063/1.1447919

    The role of neutrals in high-mode (H-mode) pedestal formation
    journal, May 2002

    • Groebner, R. J.; Mahdavi, M. A.; Leonard, A. W.
    • Physics of Plasmas, Vol. 9, Issue 5
    • DOI: 10.1063/1.1462032

    Numerical study of neoclassical plasma pedestal in a tokamak geometry
    journal, May 2004

    • Chang, C. S.; Ku, Seunghoe; Weitzner, H.
    • Physics of Plasmas, Vol. 11, Issue 5
    • DOI: 10.1063/1.1707024

    Compressed ion temperature gradient turbulence in diverted tokamak edge
    journal, May 2009

    • Chang, C. S.; Ku, S.; Diamond, P. H.
    • Physics of Plasmas, Vol. 16, Issue 5
    • DOI: 10.1063/1.3099329

    Analysis of neutral particle recycling and pedestal fueling in a H-mode DIII-D discharge
    journal, February 2010

    • Friis, Z. W.; Stacey, W. M.; Leonard, A. W.
    • Physics of Plasmas, Vol. 17, Issue 2
    • DOI: 10.1063/1.3305809

    Kinetic neoclassical transport in the H-mode pedestal
    journal, July 2014

    • Battaglia, D. J.; Burrell, K. H.; Chang, C. S.
    • Physics of Plasmas, Vol. 21, Issue 7
    • DOI: 10.1063/1.4886803

    Midplane neutral density profiles in the National Spherical Torus Experiment
    journal, August 2015

    • Stotler, D. P.; Scotti, F.; Bell, R. E.
    • Physics of Plasmas, Vol. 22, Issue 8
    • DOI: 10.1063/1.4928372

    Role of neutrals in the phase transition model
    journal, November 1996

    • Carreras, B. A.; Diamond, P. H.; Vetoulis, G.
    • Physics of Plasmas, Vol. 3, Issue 11
    • DOI: 10.1063/1.871543

    Effect of edge neutrals on the low-to-high confinement transition threshold in the DIII-D tokamak
    journal, July 1998

    • Carreras, B. A.; Owen, L. W.; Maingi, R.
    • Physics of Plasmas, Vol. 5, Issue 7
    • DOI: 10.1063/1.872949

    Effects of neutral particles on edge dynamics in Alcator C-Mod plasmas
    journal, May 2000

    • Boivin, R. L.; Goetz, J. A.; Hubbard, A. E.
    • Physics of Plasmas, Vol. 7, Issue 5
    • DOI: 10.1063/1.874016

    Neutral recycling effects on ITG turbulence
    dataset, January 2017

    • Stotler, D.; Lang, J.; Chang, C.
    • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
    • DOI: 10.11578/1562077