Laser-based Faraday effect polarimetry for real-time feedback control of plasma parameters on EAST

Laser-based Faraday effect polarimetry for real-time feedback control of plasma parameters on EAST

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 dev...

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Bibliographic Details
Published in:Journal of instrumentation 2019-12, Vol.14 (12), p.C12021-C12021, Article C12021
Main Authors: Lian, H., Jie, Y.X., Liu, H.Q., Huang, Y., Qian, J.P., Yuan, Q.P., Luo, Z.P., Ding, W.X., Brower, D.L., Li, W.M., Wang, S.X., Wang, Y.F., Chu, Y.Q.
Format: Article
Language:eng
Subjects:
Chords (geometry)
Faraday effect
Feedback control
Instruments & Instrumentation
Laser applications
Nuclear power plants
Parameters
Plasma
Plasma control
Plasma currents
Plasma density
Plasmas
Polarimeters
Polarimetry
Position measurement
Power reactors
Real time
Tokamak devices
Vertical orientation
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Summary: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.
ISSN:1748-0221
1748-0221