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Title: Scrape-off Layer Current Model for Filament Structure Observed during Edge Localized Modes (ELMs) in the DIII-D Tokamak

Abstract

The plasma in tokamaks often exhibits a relaxation oscillation called the edge localized mode (ELM), which is generally attributed to MHD instability driven by strong gradients at the plasma boundary. It is shown here that field-aligned currents flowing just outside the boundary may also play a role in the ELM process. The poloidal perturbation magnetic field during ELMs in the DIII–D tokamak calculated from measured currents can reproduce prominent observed features, including a narrow magnetic structure at the outboard midplane similar to filaments observed earlier in DIII–D and NSTX.

Authors:
; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
959392
Report Number(s):
PPPL-4309
TRN: US0903060
DOE Contract Number:
DE-ACO2-76CHO3073
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DOUBLET-3 DEVICE; EDGE LOCALIZED MODES; INSTABILITY; MAGNETIC FIELDS; OSCILLATIONS; PLASMA; RELAXATION; Edge-ionized Mode (ELM) MHD Instability, Scerape-off Layer Current (SOLC)

Citation Formats

Takahashi, Hironori, Fredrickson, E. D., and Schaffer, M. J.. Scrape-off Layer Current Model for Filament Structure Observed during Edge Localized Modes (ELMs) in the DIII-D Tokamak. United States: N. p., 2008. Web. doi:10.2172/959392.
Takahashi, Hironori, Fredrickson, E. D., & Schaffer, M. J.. Scrape-off Layer Current Model for Filament Structure Observed during Edge Localized Modes (ELMs) in the DIII-D Tokamak. United States. doi:10.2172/959392.
Takahashi, Hironori, Fredrickson, E. D., and Schaffer, M. J.. Tue . "Scrape-off Layer Current Model for Filament Structure Observed during Edge Localized Modes (ELMs) in the DIII-D Tokamak". United States. doi:10.2172/959392. https://www.osti.gov/servlets/purl/959392.
@article{osti_959392,
title = {Scrape-off Layer Current Model for Filament Structure Observed during Edge Localized Modes (ELMs) in the DIII-D Tokamak},
author = {Takahashi, Hironori and Fredrickson, E. D. and Schaffer, M. J.},
abstractNote = {The plasma in tokamaks often exhibits a relaxation oscillation called the edge localized mode (ELM), which is generally attributed to MHD instability driven by strong gradients at the plasma boundary. It is shown here that field-aligned currents flowing just outside the boundary may also play a role in the ELM process. The poloidal perturbation magnetic field during ELMs in the DIII–D tokamak calculated from measured currents can reproduce prominent observed features, including a narrow magnetic structure at the outboard midplane similar to filaments observed earlier in DIII–D and NSTX.},
doi = {10.2172/959392},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 15 00:00:00 EDT 2008},
month = {Tue Apr 15 00:00:00 EDT 2008}
}

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