Scrape-Off-Layer Current Model for Filament Structure Observed during Edge-Localized Modes in the DIII-D Tokamak

Journal Article · Fri May 23 04:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.100.205001· OSTI ID:21132446

Takahashi, Hironori; Fredrickson, E D ^[1]; Schaffer, M J ^[2]

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1. Princeton Plasma Physics Laboratory, Princeton, New Jersey (United States)
2. General Atomics, San Diego, California (United States)

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.

• OSTI ID: 21132446
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DOUBLET-3 DEVICE
EDGE LOCALIZED MODES
FILAMENTS
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
NSTX DEVICE
OSCILLATIONS
PERTURBATION THEORY
PLASMA
PLASMA SCRAPE-OFF LAYER
RELAXATION