Abstract

A primary goal for ITER and prospective fusion power reactors is to achieve long-pulse, steady-state burning plasmas. Real-time control of plasma parameters such as current profile, density profile, position is necessary to extend high-performance plasma regimes to long pulse and is required for development of ITER-like discharge scenarios. A double-pass, radially-view, 11 chords, POlarimeter-INTerferometer (POINT) system has been developed and routinely operated on the EAST Tokamak, and provides important plasma current profile, plasma density profile and the vertical position information for plasma control and physics understanding. Digital Phase Detection, which provides real-time 4 μs Faraday and density output for plasma control, has been developed, thereby allowing real time current and q profile monitoring using fast equilibrium reconstruction. Besides, the Faraday effect can measure the plasma vertical position, which provides a good tool for plasma position control.

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