ELM-Induced Plasma Transport in the DIII-D SOL.

Boedo, J. A. ; Ruadakov, D. L. ; Hollmann, E. M. ; Moyer, R. A. ; McKee, G. R. ; Burrell, K. ; Evans, T. E.

Technical Information Center Oak Ridge Tennessee

关键词: Plasma density;    Doublet-3 device;    Scrape off layer;    Edge localized modes;    Spatial resolution;   

RP-ID  :  DE200515011805

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

High temporal and spatial resolution measurements in the boundary of the DIII-D tokamak show that edge localized modes (ELMs) are composed of fast bursts of hot, dense plasma that travel radially starting at the separatrix at (approx.) 450 m/s and rotate in the scrape off layer (SOL), convecting particles and energy to the SOL and walls. The temperature and density in the ELM plasma initially correspond to those at the top of the density pedestal but decay with radius in the SOL. The temperature decay length ((approx.)1.2-1.5 cm) is much shorter than the density decay length ((approx.)3-8 cm), which in turn decreases with increasing pedestal density. The local particle and energy flux at the wall during the bursts are 10-50% ((approx.) 1-2 x 10(sup 21) m(sup -2) s(sup -1)) and 1-2% ((approx.) 20-30 kilowatt/mass(sup 2)) respectively of the LCFS average fluxes, indicating that particles are transported radially much more efficiently than heat.