W7-X Device

Wendelstein7-X will have 2×5 so-called divertor modules located at the bean-shaped cross sections that handle the steady state heat flux of 10 MW/m^2 from the plasma. The whole inner vessel wall including diagnostics is covered by actively cooled wall elements. During the first experiment campaign the symmetry of the heatload to the divertors will be proven with a less complex Test Divertor Unit (TDU) of identical geometry as the final actively cooled High Heat Flux divertor. The Test Divertor Unit is only inertially cooled which restricts the time of full power plasma operation to about 10s.

Cross-section of the plasma vessel including the plasma (pink), the vessel (blue) and the divertor installations – targets and baffles. The upper right picture shows prototype target elements with the cooling water connections. The target plates with a total area of 19 m² formed by 890 elements are made from flat Carbon Fiber Compound (CFC) plates bounded on a Cu-alloy cooling structures. Below a baffle element and a wall panel designed for less heatload are shown. The lower right shows a target element during a high heat load test at the GLADIS test facility in Garching.