title: Measurement of 2∕1 intrinsic error field of Joint TEXT tokamak.
abstract: The amplitude and spatial phase of the intrinsic error field of Joint TEXT (J-TEXT) tokamak were measured by scanning the spatial phase of an externally exerted resonant magnetic perturbation and fitting the mode locking thresholds. For a typical plasma with current of 180 kA, the amplitude of the 2∕1 component of the error field at the plasma edge is measured to be 0.31 G, which is about 1.8 × 10(-5) relative to the base toroidal field. The measured spatial phase is about 317° in the specified coordinate system (r, θ, ϕ) of J-TEXT tokamak. An analytical model based on the dynamics of rotating island is developed to verify the measured phase.
authors: State Key Laboratory of Advanced Electromagnetic Engineering and Technology, and College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
authors: B
authors: B
authors: Rao
authors: Y H
authors: YH
authors: Ding
authors: K X
authors: KX
authors: Yu
authors: W
authors: W
authors: Jin
authors: Q M
authors: QM
authors: Hu
authors: B
authors: B
authors: Yi
authors: J Y
authors: JY
authors: Nan
authors: N C
authors: NC
authors: Wang
authors: M
authors: M
authors: Zhang
authors: G
authors: G
authors: Zhuang