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

[摘要] 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.

[发布日期] 2008-04-15

[学科分类] 原子、分子光学和等离子物理

[关键词] DOUBLET-3 DEVICE;EDGE LOCALIZED MODES;INSTABILITY;MAGNETIC FIELDS;OSCILLATIONS;PLASMA;RELAXATION Edge-ionized Mode (ELM) MHD Instability;Scerape-off Layer Current (SOLC)