Hannover 2016 – scientific programme

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P: Fachverband Plasmaphysik

P 5: Poster Session- Helmholtz Graduate School for Plasma Physics

P 5.12: Poster

Monday, February 29, 2016, 16:30–19:00, Empore Lichthof

Numerical Study of the Connection Lengths for Various Magnetic Configurations in Wendelstein 7-X to Optimize the Heat Load on the Divertor — •Priyanjana Sinha, Hauke Hölbe, and Thomas Sunn Pedersen — Max Planck Institute of Plasma Physics ,Wendelsteinstraße 1, 17491 Greifswald

Fusion has the potential to play an important role as a future energy resource. It has the capacity to produce large-scale clean energy. The two main confinement concepts are the tokamak and the stellarator. The W7-X machine is based on stellarator principle and is using special form of coils to achieve steady-state plasma confinement.

Divertors are used in tokamaks and stellarator to control the exhaust of waste gases and impurities from the machine . The divertor concept of W7-X is a so-called island divertor. The island chain isolates the confinement core from regions where the plasma-wall interaction takes place.

The area of the divertor that receives the main part of the heat loads, the so-called wetted area, increases with the distance along the magnetic field from the outboard midplane to the divertor target. The connection length is relatively short in tokamaks with conventional divertors. In the stellarator island divertor, the connection length can be varied significantly, which should allow for optimization of the wetted area. We present here a numerical study of the achievable connection lengths in various W7-X configurations and discuss the possibilities for running dedicated experiments to understand the physics of what sets the wetted area.