Multi-Modal analysis of linear MHD response to resonant magnetic perturbations in DIII-D plasmas

The impact of plasma triangularity on the plasma response to 3D magnetic perturbations for DIII- D plasmas is investigated to understand its role in suppression of edge localized modes. Evidence suggests the dynamics of ELM suppression can be significantly altered by the 2D plasma shaping, namely triangularity, to the point where suppression may not be achieved [1]. By varying triangularity, pedestal density, and plasma beta using the SEGWAY framework, and calculating the 3D plasma response with GPEC, we examine the combined effect of 2D plasma shaping and 3D perturbations on ELM suppression. Preliminary results show qualitative agreement between the triangularity dependence of the kink response from GPEC and that of a related study using MARS-F[2]. Using singular value decomposition techniques, we analyze changes in dominant mode harmonics to assess the dependence of plasma response on plasma shaping. This comprehensive study identifies key factors influencing the response, providing valuable insights for optimizing plasma configurations and control strategies. [1] Paz-Soldan C. et al, Nucl. Fusion 59, 056012 (2019). [2] S. Gu et al, Nucl. Fusion 62 076031 (2022).