Speaker
Arthur Brooks
(Engineering Analysis)
Description
Modeling Blanket Ferromagnetic Loading using Edge Potential Elements
Arthur W Brooks 1 1, Han Zhang11
1Princeton Plasma Physics Laboratory abrooks@pppl.gov
Future fusion experiments and reactors will require first wall materials that can survive the thermal and nuclear radiation environment without structural degradation. Candidate materials that are under consideration include Reduced Activation Ferritic Martensitic (RAFM) steels such as Eurofer 97 and F82H. These materials are ferromagnetic and will alter the magnetic fields that not only effect the plasma confinement but result in additional forces on the structural components which must be understood, quantified and factored into the design. These magnetic forces are in addition to the eddy current Lorentz forces that result during a plasma disruption. They are present during normal steady state operation but will also result in higher flux swings within components during a disruption driving eddy currents and Lorentz forces even higher.
This paper investigates the loads resulting from the use of RAFM as a blanket material. The ANSYS code Edge Potential Elements are used to solve the non-linear transient electromagnetic field problem. The edge potential method overcomes some of the flux discontinuity issues related to ferromagnetic materials as compared to the magnetic vector potential formulation. It has been applied to ITER scale machines where the RAFM will reach magnetic saturation. Results are compared to simplified methods that may be useful for preliminary design studies.
Poster presentation preferred
Co-author
Arthur Brooks
(Engineering Analysis, Princeton Plasma Physics Lab, Princeton, United States)
