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/content/aip/journal/rsi/87/11/10.1063/1.4963378
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/content/aip/journal/rsi/87/11/10.1063/1.4963378
2016-10-03
2016-12-02

Abstract

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

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