Abstract
The MFBE_2001 code computes the magnetic field in a form suitable forfield line tracing inside and outside the plasma boundary of two- and three-dimensional finite-β equilibria. It is a modified version of the Magnetic FieldSolver for Finite-β Equilibria (MFBE) code whichwas developed for the investigation of stellaratorequilibria without net toroidal current. The numerical method used in MFBE_2001 is based on the `virtual casing' principle which also allows the computation of magnetic fields of equilibria with net toroidal current, such asquasi-axisymmetric and tokamak equilibria. The numerical accuracy of thecode is tested for an axisymmetric tokamak equilibrium and the correspondingthree-dimensional one including the toroidal field ripple. For this purpose,the results obtained with the code system VMEC/NEMEC+MFBE_2001+GOURDONare compared with those computed with the axisymmetric equilibrium code DIVA.
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