RF rectified sheath calculations in 3D RF full wave simulations with the Petra-M framework

During ICRF operation a high DC potential due to RF sheath is considered a root cause of the deleterious accumulation of high-Z impurities in the core plasma. Quantitative predictions of the RF sheath induced potential that develops on the plasma facing components (PFCs) are limited with the existing codes due to the use of a 2D antenna geometry. In this work, a new form of RF sheath physics is developed using magnetic potentials allowing us to predict for the first time the RF sheath potential in 3D RF full wave simulations [S. Shiraiwa et. al, Nucl. Fusion 63 026024 (2023)]. Our result using a 3D antenna geometry predicts that the sheath potential of 100 - 200 V is generated for 1 MW of RF power injection. Application to different devices and antennas are in progress and will be discussed.