Integrated equilibrium reconstruction and MHD stability analysis of tokamak plasmas in the EU-IM platform

Abstract : In the framework of the EUROfusion Work Package on Code Development for Integrated Modelling, a scientific Kepler workflow for the reconstruction of Tokamak plasma equilibrium was developed. It includes consolidated reconstruction codes such as EQUAL, CLISTE, EQUINOX and post-processing error bar estimator SDSS, all using the same physics and machine data ontology and methods for accessing the data used in the European Integrated Modelling (EU-IM) framework [6]. Presently implemented modules (actors) are interfaced to “data bundles” e.g. magnetic sensors, Thomson scattering diagnostics as well as poloidal field coil data, are packed into a “machine bundle”, to facilitate the data exchange in the workflow through selfconsistent datasets. The reconstruction codes feature polynomial or spline (natural or Bspline) representation for the profiles and non-uniform spatially distributed knots for the equilibrium regularisations are implemented. Equilibrium reconstructions relying on magnetics data only (magnetic diagnostic, PF/TF coils and iron core) or with added internal data (motional Stark effect, polarimetry or pressure) may be performed. For pedestal top/edge pressure profile assisted reconstructions, pre-processing of the experimental density and temperature data presently includes a median filter and time average around the time of interest, mapped to the flux coordinates obtained for that time in the previous (magnetics only) reconstruction. Ion density is assumed to be proportional to electron density and fast particle density is assumed negligible
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Rui Coelho, Blaise Faugeras, Edmondo Giovanozzi, Patrick Mc Carthy, Wolfgang Zwingmann, et al.. Integrated equilibrium reconstruction and MHD stability analysis of tokamak plasmas in the EU-IM platform. 43rd EPS conference on plasma physics, Jul 2016, Leuven, Belgium. ⟨hal-01413081⟩

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