A generic data structure for integrated modelling of tokamak physics and subsystems

Abstract

The European Integrated Tokamak Modelling Task Force (ITM-TF) is developing a new type of fully modular and flexible integrated tokamak simulator, which will allow a large variety of simulation types. This ambitious goal requires new concepts of data structure and workflow organisation, which are described for the first time in this paper. The backbone of the system is a physics-and workflow-oriented data structure which allows for the deployment of a fully modular and flexible workflow organisation. The data structure is designed to be generic for any tokamak device and can be used to address physics simulation results, experimental data (including description of subsystem hardware) and engineering issues.

Tokamak equilibrium reconstruction code LIUQE and its real time implementation

“…Assume that one exact solution for equation (6) is known, for a given source function . The corresponding boundary condition can be written on where is obtained by substituting for in equation (7). Now also assume that at iteration , for some reason related for example to numerical round-off error, to he approximation of the differential operator or to the evaluation of the boundary condition, the flux distribution is vertically shifted by ; this modifies the plasma current density that can be approximated by its first order expansion:…”

“…Despite these specificities, LIUQE can be readily implemented on any air cored Tokamak with axisymmetric passive conducting structures. To that purpose, machine specific code was grouped in dedicated initialisation blocks, and its interface with the European International Tokamak Modelling Task Force data structure [7] is under construction.…”

Service oriented architecture for scientific analysis at W7-X. An example of a field line tracer

“…ITM is to produce a comprehensive simulation package for ITER [13] with both the hardware and the software, including the middleware like Consistent Physical Objects (CPO) and universal access layer (UAL) [14]. Integration of scientific models in ITM is centered around the Kepler workflow system [15]: an existing model is wrapped as a Kepler actor.…”

Design and first applications of the ITER integrated modelling & analysis suite

“…This global design of the IMAS infrastructure has been largely inspired by the developments of the European Integrated Modelling Task Force (EU-ITM) [1][2][3], a project which also puts a strong emphasis on the development of integrated modelling standards for a large community of researchers. A large part of the IMAS infrastructure software reuses EU-ITM developments, although the original source code sometimes required significant adaptations to be consistent with the ITER Physics Data Model, which has significant improvements and new features with respect to the EU-ITM data model [3] (see section 2.2).…”