Bochum 2015 – scientific programme

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P: Fachverband Plasmaphysik

P 29: Magnetic Confinement II

P 29.3: Talk

Thursday, March 5, 2015, 17:25–17:40, HZO 30

An Automated Approach to Magnetic Divertor Configuration Design, Using an Efficient Optimization Methodology — •Maarten Blommaert¹, Holger Heumann², Martine Baelmans³, Nicolas Ralph Gauger⁴, and Detlev Reiter¹ — ¹Institute of Energy and Climate Research (IEK-4), FZ Jülich GmbH, D-52425 Jülich, Germany — ²Centre de Recherche INRIA Sophia Antipolis, BP 93 06902 Sophia Antipolis, France — ³KU Leuven, Department of Mechanical Engineering, 3001 Leuven, Belgium — ⁴TU Kaiserslautern, Chair for Scientific Computing, 67663 Kaiserslautern, Germany

At present, several plasma boundary codes exist that attempt to describe the complex interactions in the divertor SOL (Scrape-Off Layer). The predictive capability of these edge codes is still very limited. Yet, in parallel to major efforts to mature edge codes, we face the design challenges for next step fusion devices. One of them is the design of the helium and heat exhaust system. In past automated design studies, results indicated large potential reductions in peak heat load by an increased magnetic flux divergence towards the target structures. In the present study, a free boundary magnetic equilibrium solver is included into the simulation chain to verify these tendencies. Additionally, we expanded the applicability of the automated design method by introducing advanced “adjoint” sensitivity computations. This method, inherited from airfoil shape optimization in aerodynamics, allows for a large number of design variables at no additional computational cost. Results are shown for a design application of the new WEST divertor.