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5 Erosion and Deposition and Their Influence on Plasma …
Possible impurity
transport through
private flux region
First wall
Eroded
Outer divertor Eroded
Inner divertor Deposited
Local deposition
Deposition
Net Erosion
Physical & Chemical
Erosion
Long range transport
Repetition of
erosion & prompt redeposition
Mass balance is missing
Line of sight
deposition
Self shaping or
surface smoothing
occurs be erosion
and deposition
Fig. 5.1 Material transport caused by erosion and deposition in tokamak
Fig. 5.2 Erosion and deposition profiles on W-shaped divertor tiles of JT-60U [1]