Three-dimensional equilibria in axially symmetric tokamaks

Far-field analysis of axially symmetric three-dimensional directional cloaks.

Axisymmetric radiating and scattering structures whose rotational invariance is broken by non-axisymmetric excitations present an important class of problems in electromagnetics. For such problems, a cylindrical wave decomposition formalism can be used to efficiently obtain numerical solutions to the full-wave frequency-domain problem. Often, the far-field, or Fraunhofer region is of particular...

Three-dimensional analysis of tokamaks and stellarators.

The NSTAB equilibrium and stability code and the TRAN Monte Carlo transport code furnish a simple but effective numerical simulation of essential features of present tokamak and stellarator experiments. When the mesh size is comparable to the island width, an accurate radial difference scheme in conservation form captures magnetic islands successfully despite a nested surface hypothesis imposed...

Three-dimensional equilibria in DRAKONs

Three Dimensional Effects in Tokamaks – How Tokamaks Can Benefit From Stellarator Research

The paper deals with three dimensional effects in tokamaks that can be approximated by slowly varying 3d equilibria so that their theoretical description and corresponding code developments can benefit from stellarator research. We investigate the effect of magnetic field ripple and perturbation fields (magnetic islands, external coils) on fast particle orbits in ITER and ASDEX Upgrade equilibr...

Finite fringe analysis of two dimensional and axially-symmetric flows

We present an improved technique for automated interactive interferometric image data analysis and demonstrate its application to a wide range of flow configurations and conditions. The examples that we present to illustrate the technique range from the comparatively low velocity flow associated with the flight of an archery arrow to the hypersonic flow in a free-piston shock tunnel.