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Title: Microturbulence in DIII-D tokamak pedestal. III. Effects of collisions

Abstract

Gyrokinetic simulations of the H-mode pedestal in DIII-D discharge 145701 find that the kinetic ballooning mode (KBM) is the most unstable mode for low toroidal numbers (n ≤ 25) and that the trapped electron mode (TEM) dominates over the KBM at higher toroidal mode numbers for realistic pressure gradients in the pedestal. Collisions reduce the TEM growth rate but have little effects on the KBM. KBM has the conventional ballooning mode structure peaking at the outer mid-plane, while TEM has an unconventional mode structure peaking at the top and bottom of the poloidal plane.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2];  [3];  [1];  [4]
+ Show Author Affiliations
  1. Peking Univ., Beijing (China)
  2. Univ. of California, Irvine, CA (United States)
  3. Zhejiang Univ., Hangzhou (China).
  4. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1497077
Grant/Contract Number:  
AC02-05CH11231; AC05-00OR22725; SC0010416
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 12; 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

Citation Formats

Liao, X., Lin, Z., Holod, I., Xiao, Y., Li, B., and Snyder, P. B. Microturbulence in DIII-D tokamak pedestal. III. Effects of collisions. United States: N. p., 2016. Web. doi:10.1063/1.4972079.
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Liao, X., Lin, Z., Holod, I., Xiao, Y., Li, B., & Snyder, P. B. Microturbulence in DIII-D tokamak pedestal. III. Effects of collisions. United States. https://doi.org/10.1063/1.4972079
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Liao, X., Lin, Z., Holod, I., Xiao, Y., Li, B., and Snyder, P. B. Fri . "Microturbulence in DIII-D tokamak pedestal. III. Effects of collisions". United States. https://doi.org/10.1063/1.4972079. https://www.osti.gov/servlets/purl/1497077.
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@article{osti_1497077,
title = {Microturbulence in DIII-D tokamak pedestal. III. Effects of collisions},
author = {Liao, X. and Lin, Z. and Holod, I. and Xiao, Y. and Li, B. and Snyder, P. B.},
abstractNote = {Gyrokinetic simulations of the H-mode pedestal in DIII-D discharge 145701 find that the kinetic ballooning mode (KBM) is the most unstable mode for low toroidal numbers (n ≤ 25) and that the trapped electron mode (TEM) dominates over the KBM at higher toroidal mode numbers for realistic pressure gradients in the pedestal. Collisions reduce the TEM growth rate but have little effects on the KBM. KBM has the conventional ballooning mode structure peaking at the outer mid-plane, while TEM has an unconventional mode structure peaking at the top and bottom of the poloidal plane.},
doi = {10.1063/1.4972079},
journal = {Physics of Plasmas},
number = 12,
volume = 23,
place = {United States},
year = {Fri Dec 16 00:00:00 EST 2016},
month = {Fri Dec 16 00:00:00 EST 2016}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.4972079
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Citation Metrics:
Cited by: 4 works
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Figures / Tables:

Figure 1 Figure 1: Plasma profiles in the pedestal region of DIII-D discharge 145701 at time 33 ms as functions of normalized poloidal flux (${\psi}_n$). The panels, from left to right, show normalized temperatures (Ti and Te), and density (ni = ne) profiles, inverse temperature and density scale length, be values, andmore » safety factor (q). The vertical black dashed line indicates the radial position of the peak gradient region of pedestal and ${\beta}_e$ = 0.14% at the dotted line position.« less
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Works referenced in this record:

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Microturbulence in DIII-D tokamak pedestal. II. Electromagnetic instabilities
journal, August 2015

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    Works referencing / citing this record:

    A conservative scheme of drift kinetic electrons for gyrokinetic simulation of kinetic-MHD processes in toroidal plasmas
    journal, October 2017

    • Bao, J.; Liu, D.; Lin, Z.
    • Physics of Plasmas, Vol. 24, Issue 10
    • DOI: 10.1063/1.4995455

    Intrinsic current driven by electromagnetic electron drift wave turbulence in the tokamak pedestal region
    journal, October 2019

    Effects of RMP-induced changes of radial electric fields on microturbulence in DIII-D pedestal top
    journal, February 2019

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      Figures / Tables found in this record:

      Figure 1 (p. 3)figure
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