Edge poloidal rotation profiles of H-mode plasmas in the JFT-2M tokamak

TLDR

Edge poloidal rotation in L‑ and H‑mode plasmas of the JFT‑2M tokamak is investigated spectroscopically to study its radial structure. During the L‑to‑H transition the electron‑diamagnetic poloidal flow abruptly appears near the edge, peaks at the separatrix, and its magnitude shows no dependence on ion collisionality or poloidal gyroradius. Citation: Y.

Abstract

Parameter dependence of the radial structure of edge poloidal rotation is studied with spectroscopic measurements for L- and H-mode plasmas in the JFT-2M tokamak [Y. Miura et al., in Plasma Physics and Controlled Nuclear Fusion Research, Proceedings of the 13th International Conference, Washington 1990 (IAEA, Vienna, 1991), Vol. 1, p. 325]. The poloidal flow is in the electron diamagnetic direction and appears suddenly near the plasma edge at the H-mode transition. The poloidal rotation velocity profile in the H mode has a peak at the separatrix. No critical normalized ion collisionality, ν*i, for the transition of the L to the H mode is observed. The size of the poloidal flow in the H mode has no dependence on the poloidal gyroradius.