29th Symposium on Fusion Technology (SOFT 2016)

P4.011 Modelling magnetic effects for steel rebar of tokamak buildings

8 Sep 2016, 14:20

1h 40m

Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Board: 11

Poster A. Experimental Fusion Devices and Supporting Facilities P4 Poster session

Speaker

Boris Lyublin (JSC "NIIEFA")

Description

Concrete structures of tokamak buildings are reinforced with steel rebar that produces a substantial contribution into the tokamak field both in the plasma region and in the building where the service staff and magnetically sensitive equipment will be located. The article describes an advanced approach to modelling magnetic properties of reinforced concrete structures bearing in mind the anisotropic effect.  Analytical and numerical evaluations have been obtained for equivalent anisotropic properties of the rebar pattern with respect to its realistic geometry and permeability. The equivalent model has been validated in the computation of a test problem. For comparison, simulations have been carried out with a detailed 3D FE model that describes each of the steel rods. For the simulations the codes KOMPOT and KLONDIKE have been applied. The equivalent model has required about ten time less finite elements than the detailed model. A comparison of the fields obtained has demonstrated a very good match, even for the distances comparable with the rebar rod spacings.