Initial measurements of plasma current and electron density profiles using a polarimeter/interferometer (POINT) for long pulse operation in EAST (invited)

A double-pass, radially viewing, far-infrared laser-based POlarimeter-INTerferometer (POINT)system utilizing the three-wave technique has been implemented for diagnosing theplasma current andelectron density profiles in the Experimental Advanced SuperconductingTokamak (EAST). POINT has been operated routinely during the most recent experimental campaign and provides continuous 11 chord line-integratedFaraday effect anddensity measurement throughout the entireplasma discharge for all heating schemes and allplasma conditions (including ITER relevant scenario development). Reliability of both the polarimetric and interferometricmeasurements is demonstrated in 25 splasmas with H-mode and 102 s long-pulse discharges.Current density, safety factor (q), andelectron density profiles are reconstructed using equilibrium fitting code (EFIT) with POINT constraints for theplasma core.

Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: H. Q. Liu, J. P. Qian, Y. X. Jie, W. X. Ding, D. L. Brower, Z. Y. Zou, W. M. Li, H. Lian, S. X. Wang, Y. Yang, L. Zeng, T. Lan, Y. Yao, L. Q. Hu, X. D. Zhang and B. N. Wan Source Type: research