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Title: Measurements of three-dimensional flows induced by magnetic islands

Abstract

Magnetic reconnection and the resulting complex magnetic field geometries are fundamental aspects of our understanding of both space and laboratory plasmas. We report on the observation of three-dimensional (3D) impurity ion flow perturbation due to counterstreaming flows in the boundary plasma of the DIII-D tokamak. These counterstreaming flows arise not due to the magnetic reconnection itself but from the subsequent creation of collections of isolated flux tubes called magnetic islands. The magnetic islands form chains that wrap helically around the tokamak and modify local pressure balance generating a distinctive pattern of velocity perturbations that confirm long-standing 3D transport simulations. EMC3-EIRENE fluid modeling shows that these velocity perturbations arise from parallel pressure gradients that result principally from the radial temperature gradient across the magnetic islands and are supported by a momentum-loss feedback loop.

Authors:
ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo; ; ORCiD logo;
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1632031
Alternate Identifier(s):
OSTI ID: 1630427; OSTI ID: 1648981; OSTI ID: 1763930
Report Number(s):
LLNL-JRNL-779987
Journal ID: ISSN 2643-1564; PPRHAI; 023285
Grant/Contract Number:  
FC02-04ER54698; AC52-07NA27344; AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Physical Review Research
Additional Journal Information:
Journal Name: Physical Review Research Journal Volume: 2 Journal Issue: 2; Journal ID: ISSN 2643-1564
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; magnetic confinement fusion; plasma fusion; tokamaks; optical plasma measurements; two-fluid & multi-fluid model

Citation Formats

Samuell, C. M., Lore, J. D., Meyer, W. H., Shafer, M. W., Allen, S. L., Evans, T. E., and Howard, J. Measurements of three-dimensional flows induced by magnetic islands. United States: N. p., 2020. Web. doi:10.1103/PhysRevResearch.2.023285.
Samuell, C. M., Lore, J. D., Meyer, W. H., Shafer, M. W., Allen, S. L., Evans, T. E., & Howard, J. Measurements of three-dimensional flows induced by magnetic islands. United States. doi:https://doi.org/10.1103/PhysRevResearch.2.023285
Samuell, C. M., Lore, J. D., Meyer, W. H., Shafer, M. W., Allen, S. L., Evans, T. E., and Howard, J. Thu . "Measurements of three-dimensional flows induced by magnetic islands". United States. doi:https://doi.org/10.1103/PhysRevResearch.2.023285.
@article{osti_1632031,
title = {Measurements of three-dimensional flows induced by magnetic islands},
author = {Samuell, C. M. and Lore, J. D. and Meyer, W. H. and Shafer, M. W. and Allen, S. L. and Evans, T. E. and Howard, J.},
abstractNote = {Magnetic reconnection and the resulting complex magnetic field geometries are fundamental aspects of our understanding of both space and laboratory plasmas. We report on the observation of three-dimensional (3D) impurity ion flow perturbation due to counterstreaming flows in the boundary plasma of the DIII-D tokamak. These counterstreaming flows arise not due to the magnetic reconnection itself but from the subsequent creation of collections of isolated flux tubes called magnetic islands. The magnetic islands form chains that wrap helically around the tokamak and modify local pressure balance generating a distinctive pattern of velocity perturbations that confirm long-standing 3D transport simulations. EMC3-EIRENE fluid modeling shows that these velocity perturbations arise from parallel pressure gradients that result principally from the radial temperature gradient across the magnetic islands and are supported by a momentum-loss feedback loop.},
doi = {10.1103/PhysRevResearch.2.023285},
journal = {Physical Review Research},
number = 2,
volume = 2,
place = {United States},
year = {2020},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
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DOI: https://doi.org/10.1103/PhysRevResearch.2.023285

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