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Ion cyclotron radio frequency range (ICRF) power plays an important role inheating and current drive in fusion devices. However, experiments show that inthe ICRF regime there is a formation of a radio frequency (RF) sheath at thematerial and antenna boundaries that influences sputtering and powerdissipation. Given the size of the sheath relative to the scale of the device,it can be approximated as a boundary condition (BC). Electromagnetic fieldsolvers in the ICRF regime typically treat material boundaries as perfectlyconducting, thus ignoring the effect of the RF sheath. Here we describeprogress on implementing a model for the RF sheath based on a finite impedancesheath BC formulated by J. Myra and D. A. D'Ippolito, Physics of Plasmas 22(2015) which provides a representation of the RF rectified sheath includingcapacitive and resistive effects. This research will discuss the results fromthe development of a parallelized cold-plasma wave equation solver Stix thatimplements this non-linear sheath impedance BC through the method of finiteelements in pseudo-1D and pseudo-2D using the MFEM library. The verificationand comparison of the sheath BC from Stix with results from H. Kohno and J.Myra, Computer Physics Communications 220 129-142 (2017) will also bediscussed.

Development of Impedance Sheath Boundary Condition in Stix Finite Element RF Code