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Title: Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-D [Impurity confinement and transport in high confinement regimes without ELMs on DIII-D]

Abstract

Here, impurity transport in the DIII-D tokamak is investigated in stationary high confinement (H-mode) regimes without edge localized modes (ELMs). In plasmas maintained by resonant magnetic perturbation (RMP) ELM-suppression and QH-mode the confinement time of fluorine (Z=9) is equivalent to that in ELMing discharges with 40 Hz ELMs. For selected discharges with impurity injection the impurity particle confinement time compared to the energy confinement time is in the range of τpe ≈ 2 $$-$$ 3. In QH-mode operation the impurity confinement time is shown to be smaller for intense, coherent magnetic and density fluctuations of the edge harmonic oscillation than weaker fluctuations. Transport coefficients are derived from the time evolution of the impurity density profile and compared to neoclassical and turbulent transport models NEO and TGLF. Neoclassical transport of fluorine is found to be small compared to the experimental values. In the ELMing and RMP ELM-suppressed plasma the impurity transport is affected by the presence of tearing modes. For radii larger than the mode radius the TGLF diffusion coefficient is smaller than the experimental value by a factor of 2-3, while the convective velocity is within error estimates. Low levels of diffusion are observed for radii smaller than the tearing mode radius. In the QH-mode plasma investigated, the TGLF diffusion coefficient higher inside of ρ = 0.4 and lower outside of 0.4 than the experiment, and the TGLF convective velocity is more negative by a factor of approximately 1.7.

Authors:
 [1]; ORCiD logo [2];  [1];  [1];  [2]; ORCiD logo [2]; ORCiD logo [2];  [3];  [4]; ORCiD logo [2];  [5];  [2];  [2];  [5]
  1. Princeton Univ., Princeton, NJ (United States). Princeton Plasma Physics Lab.
  2. General Atomics, San Diego, CA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of Wisconsin, Madison, WI (United States)
  5. Univ. of California San Diego, La Jolla, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)
Contributing Org.:
DIII-D Team
OSTI Identifier:
1350063
Alternate Identifier(s):
OSTI ID: 1228317; OSTI ID: 1870963
Report Number(s):
LLNL-JRNL-834525
Journal ID: ISSN 1070-664X; PHPAEN
Grant/Contract Number:  
FC02-04ER54698; AC02-09CH11466; AC52-07NA27344; FG02-89ER53296; FG02-08ER54999
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; 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; plasma confinement; plasma impurities; emission spectroscopy; wave mechanics; plasma displays; plasma properties and parameters; tokamaks; plasma instabilities; thermal transport; fusion reactors

Citation Formats

Grierson, Brian A., Burrell, Keith H., Nazikian, Raffi M., Solomon, Wayne M., Garofalo, Andrea M., Belli, Emily A., Staebler, Gary M., Fenstermacher, Max E., McKee, George R., Evans, Todd E., Orlov, D. M., Smith, S. P., Chrobak, C., and Chrystal, C. Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-D [Impurity confinement and transport in high confinement regimes without ELMs on DIII-D]. United States: N. p., 2015. Web. doi:10.1063/1.4918359.
Grierson, Brian A., Burrell, Keith H., Nazikian, Raffi M., Solomon, Wayne M., Garofalo, Andrea M., Belli, Emily A., Staebler, Gary M., Fenstermacher, Max E., McKee, George R., Evans, Todd E., Orlov, D. M., Smith, S. P., Chrobak, C., & Chrystal, C. Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-D [Impurity confinement and transport in high confinement regimes without ELMs on DIII-D]. United States. https://doi.org/10.1063/1.4918359
Grierson, Brian A., Burrell, Keith H., Nazikian, Raffi M., Solomon, Wayne M., Garofalo, Andrea M., Belli, Emily A., Staebler, Gary M., Fenstermacher, Max E., McKee, George R., Evans, Todd E., Orlov, D. M., Smith, S. P., Chrobak, C., and Chrystal, C. Fri . "Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-D [Impurity confinement and transport in high confinement regimes without ELMs on DIII-D]". United States. https://doi.org/10.1063/1.4918359. https://www.osti.gov/servlets/purl/1350063.
@article{osti_1350063,
title = {Impurity confinement and transport in high confinement regimes without edge localized modes on DIII-D [Impurity confinement and transport in high confinement regimes without ELMs on DIII-D]},
author = {Grierson, Brian A. and Burrell, Keith H. and Nazikian, Raffi M. and Solomon, Wayne M. and Garofalo, Andrea M. and Belli, Emily A. and Staebler, Gary M. and Fenstermacher, Max E. and McKee, George R. and Evans, Todd E. and Orlov, D. M. and Smith, S. P. and Chrobak, C. and Chrystal, C.},
abstractNote = {Here, impurity transport in the DIII-D tokamak is investigated in stationary high confinement (H-mode) regimes without edge localized modes (ELMs). In plasmas maintained by resonant magnetic perturbation (RMP) ELM-suppression and QH-mode the confinement time of fluorine (Z=9) is equivalent to that in ELMing discharges with 40 Hz ELMs. For selected discharges with impurity injection the impurity particle confinement time compared to the energy confinement time is in the range of τp/τe ≈ 2 $-$ 3. In QH-mode operation the impurity confinement time is shown to be smaller for intense, coherent magnetic and density fluctuations of the edge harmonic oscillation than weaker fluctuations. Transport coefficients are derived from the time evolution of the impurity density profile and compared to neoclassical and turbulent transport models NEO and TGLF. Neoclassical transport of fluorine is found to be small compared to the experimental values. In the ELMing and RMP ELM-suppressed plasma the impurity transport is affected by the presence of tearing modes. For radii larger than the mode radius the TGLF diffusion coefficient is smaller than the experimental value by a factor of 2-3, while the convective velocity is within error estimates. Low levels of diffusion are observed for radii smaller than the tearing mode radius. In the QH-mode plasma investigated, the TGLF diffusion coefficient higher inside of ρ = 0.4 and lower outside of 0.4 than the experiment, and the TGLF convective velocity is more negative by a factor of approximately 1.7.},
doi = {10.1063/1.4918359},
journal = {Physics of Plasmas},
number = 5,
volume = 22,
place = {United States},
year = {Fri Apr 17 00:00:00 EDT 2015},
month = {Fri Apr 17 00:00:00 EDT 2015}
}

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Works referencing / citing this record:

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Long-lived predator-prey dynamics in the pedestal of near-zero torque high performance DIII-D plasmas
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