ThinCurr, TokaMaker and friends: Open-source fusion modeling tools for engineering, analysis, and education

The PSI-Tet [1] and PSI-Tri [2] code bases have been merged into a common framework of reusable infrastructure for fusion-relevant simulation tools based on finite element methods on unstructured grids. In addition to the existing 3D force-free ideal MHD equilibrium [3] and 3D time-dependent extended MHD [4] tools, two additional capabilities have been added: 1) A 3D thin-wall current modeling tool named “ThinCurr” [5] that is being used to study non-axisymmetric currents in 3D device structures (eg. ports and REMCs) and as an alternative to fourier-based current potential formulations in stellarator coil optimization. 2) A 2D static and time-dependent Grad-Shafranov equilibrium tool named “TokaMaker”, that is designed to be a user-friendly and open tool for device design, control development and education. The core framework provides common capabilities to all tools, including: meshing directly from CAD models, access to scalable linear and nonlinear solvers, extensible finite element representations, parallelization via OpenMP+MPI, and 3D visualization through VisIt and similar tools. Information and development plans for ThinCurr, TokaMaker, and the full toolkit will be presented.

[1] C. Hansen, PhD Thesis (2014)

[2] C. Hansen, Phys. Plasmas 24 042513 (2017)

[3] T. Benedett, Nucl. Fusion 61 036022 (2021)

[4] C. Hansen, Phys. Plasmas 22 042505 (2015)

[5] A. Battey, APS-DPP poster (2022)