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Implications of Wall Recycling and Carbon Source Locations on Core Plasma Fueling and Impurity Content in DIII-D.
J. G. Watkins
L. W. Owen
Gary Dean Porter
W. M. Meyer
G. Wang
M. E. Rensink
N. S. Wolf
T. W. Petrie
M. E. Fenstermacher
R. J. Groebner
C. J. Lasnier
L. Zeng
D. L. Rudakov
J. A. Boedo
R. A. Moyer
N. H. Brooks
M. Groth
出版
United States. Department of Energy
, 2004
URL
http://books.google.com.hk/books?id=Ri8FDQEACAAJ&hl=&source=gbs_api
註釋
Measurement and modeling of the 2-D poloidal D{alpha} intensity distribution in DIII-D low and medium density L-mode and ELMy H-mode plasmas indicate that hydrogen neutrals predominantly fuel the core from the divertor X-point region. The 2-D distribution of neutral deuterium and low-charge-state carbon were measured in the divertor and the high-field side midplane scrape-off layer (SOL) using tangentially viewing cameras. The emission in the high-field SOL at the equatorial plane was found to be three to four orders of magnitude lower than at the strike points in the divertor, suggesting a strong divertor particle source. Modeling using the UEDGE/DEGAS codes predicted the poloidal fueling distribution to be dependent on the direction of the ion Bx{Delta}B drift. In plasmas with the Bx{Delta}B drift into the divertor stronger fueling from the inner divertor than from the outer is predicted, due to a lower-temperature and higher-density plasma in the inner leg. UEDGE simulations with carbon produced by both physical and chemical sputtering at the divertor plates and walls only are in agreement with a large set of diagnostic data. The simulations indicate flow reversal in the inner divertor that augments the leakage of carbon ions from the divertor into the core.
