Effects of Magnetic Coil Misalignments on the SAS Divertor

A new Small Angle Slot (SAS) divertor has recently been installed and tested in DIII-D, promising easier plasma detachment and lower target temperatures. Previous SAS analyses focused on the accuracy of the 2D reconstructed strike geometry and 3D ``vacuum'' analyses of RMPs on the lobes and on the strike point modulation. The present work introduces a kinetic EFIT 2D equilibrium reconstructed from a recent 2017 SAS experiment. The kinetic EFIT and its ``vacuum'' topology due to 3D error and perturbation fields are compared to the previous analyses based on a synthetic equilibrium, showing similar results. The magnetic lobes remain confined within the SAS and the toroidal modulation of the strike point position is only slightly affected. Further simulations of a possible shift of the toroidal field coil are carried out through 3D field-line tracing. The effects of such misalignments including plasma response on the SAS are discussed, together with the corresponding implications for the design of the next envisaged SAS upgrade.