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Effect of Poloidal Density Variation of Neutral Atoms on the Tokamak Edge
2002
Physical Review Letters
Preserved Fulltext
Neutral atoms in the tokamak edge affect the electric field and plasma flow through charge exchange. Here, it is shown that these effects depend sensitively on the poloidal location of the atoms. It is found that the radial electric field and toroidal flow velocity in a collisional edge plasma are largest if the atoms are concentrated on the inboard side. This feature may explain MAST and COMPASS-D observations indicating easier H-mode access for inboard gas puffing. The results suggest an
doi:10.1103/physrevlett.89.225003
pmid:12485076
fatcat:lmqjgaopa5gulkos77owala4xm