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The Wendelstein 7-X stellarator facility at the Max Planck Institute for Plasma Physics (IPP) in Greifswald, Germany, is preparing for higher heating power and longer plasma pulses.

After a that ended in late 2018—during which operators were able to achieve discharge times of up to 100 seconds (2 MW of input heating power) or 30 seconds at 6 MW—the Wendelstein 7-X team is now preparing to install actively water-cooled components inside the vacuum vessel that will allow the next round of experiments to generate plasma pulses of up to 30 minutes.

The previous cladding made of carbon tiles has now been removed, and the vessel is ready for the installation of the new water-cooled protective elements. Chief among them is the new divertor, a highly technical component made of plasma-facing front tiles mounted on water-cooled back plates—assemblies made of nearly 500,000 parts, which were the object of more than 15 years of development, fabrication and testing.

Commissioning of the upgraded facility is expected to begin early next year.

Read the full article on the IPP Greifswald .

--Cooling elements on the back side of a divertor plate. Photo: IPP, Michael Herdlein