title: Role of reynolds stress-induced poloidal flow in triggering the transition to improved ohmic confinement on the HT-6M tokamak
abstract: Time and space resolved measurements of electrostatic Reynolds stress, radial electric field E(r), and plasma rotations have been performed across the transition to improved Ohmic confinement in the Hefei Tokamak-6M (HT-6M). The first experimental evidence of the correlation between the enhanced Reynolds stress gradient and the poloidal flow acceleration in the edge plasma is presented. The results indicate that the turbulence-induced Reynolds stress might be the dominant mechanism to create the sheared poloidal flow and E(r), which may further trigger the transition.
authors.affiliation: Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
authors.initials: YH
authors.lastname: Xu
authors.initials: CX
authors.lastname: Yu
authors.initials: JR
authors.lastname: Luo
authors.initials: JS
authors.lastname: Mao
authors.initials: BH
authors.lastname: Liu
authors.initials: JG
authors.lastname: Li
authors.initials: BN
authors.lastname: Wan
authors.initials: YX
authors.lastname: Wan