Development of JT-60SA equilibrium controller with an advanced ISO-FLUX control scheme in the presence of large eddy currents and voltage saturation of power supplies

2021 
An advanced ISO-FLUX equilibrium control scheme is developed and implemented in the JT-60SA equilibrium controller, which is essential for vertical displacement event (VDE) control under DEMO reactor relevant device conditions.Since conditions for VDE control in the DEMO reactor are highly disparate from that in present day tokamaks and even from that in ITER, such as the absence of in-vessel coils and stabilization plates, a large gap between plasmas and vacuum vessels, and eddy currents flowing in the breeding blanket, etc., thus improvement of the conventional control scheme is required. The developed scheme not only adaptivelyadjusts balance between plasma position/shape control and plasma current controlwithin limited power supply voltages, where plasma current control affects plasmaposition/shape control, and vice versa, but also robustly controls position of plasmasin the presence of the large eddy currents. Those two schemes contribute to enhancethe VDE controllability under the DEMO relevant device conditions. More specifically,the advanced ISO-FLUX control scheme broadens the operation window with the safe-margin from the unpredicted disturbances, which stem from auxiliary heating andminor-disruptions. The JT-60SA equilibrium controller with the developed scheme iswell verified by a magnetohydrodynamic equilibrium control simulator "MECS" andready for the integrated commissioning of JT-60SA, whose device condition is notablyrelevant to the DEMO reactor.
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