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P: Fachverband Plasmaphysik

P 12: Poster Session - Magnetic Confinement

P 12.12: Poster

Dienstag, 18. März 2014, 16:30–18:30, SPA Foyer

Systems code studies for assessment and selection of operational points for a tokamak DEMO reactor — •Mitja Beckers, Wolfgang Biel, and Ulrich Samm — Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM Association, D-52425 Jülich, Germany

A big step towards commercial fusion will be the commissioning of the first DEMO power plant. For tokamaks a steady state can only be achieved in advanced scenarios with a high bootstrap fraction and non-inductive current drive. For designing a reactor the parameter space is limited by physics constraints, which can hardly be computed alltogether on a sophisticated level. Thus empirical findings are extrapolated to larger machines by scaling laws in order to cast complex physics into computable macroscopic dependencies. Systems codes are used to predict stable operational points for given reactor scenarios and to perform parameter scans for optimized selection. Scenario specifications like divertor detachment and their effects on material lifetime and plasma stability need to be more properly represented in systems codes in order to define new criteria for the fine-selection of stable operational points, which can then be further investigated by highly sophisticated, but time-consuming codes. Therefore the scalings and equations in the code were cross-checked with latest experimental findings and a new module for lifetime estimations for the first Wall is being developed.