Fig.3-21　Schematic of plasma flow in the tokamak edge SOL, Fig.3-22　Two-dimensional structure of plasma flow for (a) upper X-point and (b) lower X-point cases

 

Fig.3-21　Schematic of plasma flow in the tokamak edge SOL
  
Fig.3-22　Two-dimensional structure of plasma flow for (a) upper X-point and (b) lower X-point cases
Plasma in the SOL, which surrounds the core plasma, mainly flows along the magnetic field line (green line), and finally reaches the divertor plate (blue arrow), but the reverse flow was observed as shown by the red arrow.

 


  
(a) In the upper X-point case, the plasma flows symmetrically into the inner part and outer part of the divertor plate.
(b) In the lower X-point case, plasma flow is directed away from the divertor plate in the outer SOL region. The black line represents the magnetic separatrix with an X-point.

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