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Title: Electromagnetic effects on dynamics of high-beta filamentary structures

Abstract

The impacts of the electromagnetic effects on blob dynamics are considered. Electromagnetic BOUT++ simulations on seeded high-beta blobs demonstrate that inhomogeneity of magnetic curvature or plasma pressure along the filament leads to bending of the blob filaments and the magnetic field lines due to increased propagation time of plasma current (Alfvén time). The bending motion can enhance heat exchange between the plasma facing materials and the inner SOL region. The effects of sheath boundary conditions on the part of the blob away from the boundary are also diminished by the increased Alfvén time. Using linear analysis and the BOUT++ simulation, it is found that electromagnetic effects in high temperature and high density plasmas reduce the growth rate of resistive drift wave turbulence when resistivity drops below some certain value. Lastly, in the course of blobs motion in the SOL its temperature is reduced, which leads to enhancement of resistive effects, so the blob can switch from electromagnetic to electrostatic regime, where resistive drift wave turbulence become important.

Authors:
 [1];  [2];  [3];  [1]
  1. Univ. of California San Diego, La Jolla, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Naval Research Lab. (NRL), Washington, DC (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); Kwanjeong Educational Foundation
OSTI Identifier:
1305840
Alternate Identifier(s):
OSTI ID: 1228483
Report Number(s):
LLNL-JRNL-698417
Journal ID: ISSN 1070-664X; PHPAEN
Grant/Contract Number:  
AC52-07NA27344; FG02-04ER54739; SC0010413; AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 1; 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; Magnetic fields; Plasma blobs; Plasma temperature; Drift waves; Electrostatic waves

Citation Formats

Lee, Wonjae, Umansky, Maxim V., Angus, J. R., and Krasheninnikov, Sergei I. Electromagnetic effects on dynamics of high-beta filamentary structures. United States: N. p., 2015. Web. doi:10.1063/1.4905639.
Lee, Wonjae, Umansky, Maxim V., Angus, J. R., & Krasheninnikov, Sergei I. Electromagnetic effects on dynamics of high-beta filamentary structures. United States. https://doi.org/10.1063/1.4905639
Lee, Wonjae, Umansky, Maxim V., Angus, J. R., and Krasheninnikov, Sergei I. 2015. "Electromagnetic effects on dynamics of high-beta filamentary structures". United States. https://doi.org/10.1063/1.4905639. https://www.osti.gov/servlets/purl/1305840.
@article{osti_1305840,
title = {Electromagnetic effects on dynamics of high-beta filamentary structures},
author = {Lee, Wonjae and Umansky, Maxim V. and Angus, J. R. and Krasheninnikov, Sergei I.},
abstractNote = {The impacts of the electromagnetic effects on blob dynamics are considered. Electromagnetic BOUT++ simulations on seeded high-beta blobs demonstrate that inhomogeneity of magnetic curvature or plasma pressure along the filament leads to bending of the blob filaments and the magnetic field lines due to increased propagation time of plasma current (Alfvén time). The bending motion can enhance heat exchange between the plasma facing materials and the inner SOL region. The effects of sheath boundary conditions on the part of the blob away from the boundary are also diminished by the increased Alfvén time. Using linear analysis and the BOUT++ simulation, it is found that electromagnetic effects in high temperature and high density plasmas reduce the growth rate of resistive drift wave turbulence when resistivity drops below some certain value. Lastly, in the course of blobs motion in the SOL its temperature is reduced, which leads to enhancement of resistive effects, so the blob can switch from electromagnetic to electrostatic regime, where resistive drift wave turbulence become important.},
doi = {10.1063/1.4905639},
url = {https://www.osti.gov/biblio/1305840}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 1,
volume = 22,
place = {United States},
year = {Mon Jan 12 00:00:00 EST 2015},
month = {Mon Jan 12 00:00:00 EST 2015}
}

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Cited by: 15 works
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Works referenced in this record:

Direct Observation of Current in Type-I Edge-Localized-Mode Filaments on the ASDEX Upgrade Tokamak
journal, March 2011


BOUT++: A framework for parallel plasma fluid simulations
journal, September 2009


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Filament velocity scaling laws for warm ions
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Current carrying blob filaments and edge-localized-mode dynamics
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Edge instability regimes with applications to blob transport and the quasicoherent mode
journal, September 2005


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journal, November 2012


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journal, October 2008


Inviscid evolution of large amplitude filaments in a uniform gravity field
journal, November 2014


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journal, May 2001


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journal, June 2009


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journal, May 2000


ITER divertor performance in the low-activation phase
journal, November 2013


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journal, May 2013


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journal, June 2011


Effects of parallel electron dynamics on plasma blob transport
journal, August 2012


Filament structures at the plasma edge on MAST
journal, November 2006


Works referencing / citing this record:

Electromagnetic Viscous-Resistive-Drift-Wave Instability in Burning Plasma
journal, May 2019


Two-fluid MHD regime of resistive drift-wave instability
journal, September 2018


Stability of scrape-off layer plasma: A modified Rayleigh–Bénard problem
journal, February 2019


Dynamics of scrape-off layer filaments in high β plasmas
journal, September 2019