Plasma flow measurement in high- and low-field-side SOL and influence on the divertor plasma in JT-60U
N. Asakura, S. Sakurai, H. Takenaga, K. Itami, O. Naito, S. Higashijima, Y. Koide, Y. Sakamoto, H. Kubo, G.D. Porter1), T.D. Rognlien1), M.E. Rensink1)
Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
1) Lawrence Livermore National Laboratory, P.O.Box 808, Livermore, CA 94550, USA
Abstract.
SOL plasma flow plays an important role in the plasma transport along the field lines, and influences control of the divertor plasma and impurity ions. In JT-60U, three reciprocating Mach probes were installed at the high-field-side (HFS) baffle, low-field-side (LFS) midplane and just below the X-point. The measurements of the SOL flow and plasma profiles both at the HFS and LFS found out the SOL flow pattern and its driving mechanism. Particle flow produced by plasma drift is dominant near the separatrix, and the parallel SOL flow is driven to reduce asymmetry of the drift flow in torus. Particle fluxes towards the HFS and LFS divertors were evaluated including the drift flow, and in-out asymmetries of the divertor particle flux under attached and detached divertor conditions were explained. Effects of the gas puff location on the SOL flow was also investigated.