Robust control of q-profile and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.svg"><mml:msub><mml:mi>β</mml:mi><mml:mi>p</mml:mi></mml:msub></mml:math> using data-driven models on EAST

A new robust feedback controller for the safety factor profile and poloidal plasma pressure parameter has been developed using a two-time-scale data-driven model. The model describes linear responses of ι βp with respect to auxiliary heating & current drive (H&CD) powers, around typical equilibrium in an H-mode steady-state discharge on EAST. comprises carefully designed low-pass filter timescale separation, decoupling module three local controllers synthesized from H∞ norm optimization singular value decomposition. actuators are lower hybrid (LHCD) system at 4.6 GHz ion cyclotron resonance (ICRH) 33 MHz. Taking into account actuation dynamics, anti-windup technique is employed condition online aiming attenuate negative effects moderate time delays power saturations. Extensive nonlinear closed-loop simulations METIS code suggest that high central magnetic shear characterize advanced tokamak scenarios can be achieved sustained EAST good tracking performance reasonable robustness via proposed control scheme. core range delays, saturations varying weighting functions evaluated numerically, compared discussed. uncertainties including line-averaged density 〈n¯e〉, enhancement Hfactor effective charge number Zeff assessed analyzed.