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The ITER fusion reactor in Caderache is being built to demonstrate that nuclear fusion from hydrogen can be a clean and reliable energy source. In a high-temperature plasma, the nuclei of hydrogen atoms are fused into Helium. This releases a lot of energy. After a reaction, the plasma is “contaminated” with Helium and this can be partially pumped off with cryo-pumps. This page shows some shields that are part of cryo pumps.
This firm has built components for a fusion reactor in France. DeMaCo in North Holland has decades of experience in cryogenic applications. Therefore DeMaCo was contracted to build cooling parts for the ITER (International Thermonuclear Experimental Reactor) project. After ignition of the fusion plasma, light components form. These have to be pumped out of the reactor, which is done by a crygenic pump. This pump functions at very low temperatures, and the light components will condensate on the cold surfaces of the pump. The pump closes after condensation and is heated to evaporate the components which are then exhausted.