The SOL plasma flow and plasma detachment have been studied in the W-shaped divertor with pumping system

Profiles of (a) Divertor geometry in JT-60U and measurement of X-point reciprocating Mach probe, (b) electron temperatures, (c) electron densities, (d) Mach numbers. Squares and circles indicate attached and detached divertor plasmas. Hatched area shows region where plasma is detached during X-point MARFE. Ref. 3