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Metal clouds to protect fusion reactor walls from heat flux
by Brooks Hays
Washington (UPI) Aug 7, 2017


How can scientists protect the structures that house fusion reactors?

Scientists in Belgium have showed that vapor clouds of liquid metal can successfully reflect heat during extreme temperature flux.

Today, fusion energy is only an ambitious idea. Researchers continue to build and test fusion reactors, but self-sustaining fusion has not yet been achieved. Still, some scientists are preparing for a future where fusion energy and fusion reactors are a reality.

Currently, fusion test facilities deploy tungsten walls, but these are unlikely to be able to withstand the heat generated by a fusion reactor in the future. Scientists at Ghent University modeled a replacement wall made of liquid metals.

Models showed tin or lithium metal can be liquified and vaporized when it is pushed through a mesh layer of tungsten. The cloud of liquid metal can self-repair damage caused by the reactor's hot plasma.

The metal vapor will grow and shrink as the cloud wall is bombarded by plasma. The vapor droplets will absorb much of the heat, allowing the wall to reflect the thermal energy across a larger area.

Researchers found the liquid metal cloud technology allows the tungsten wall to maintain a stable surface temperature, even as the reactor experiences extreme temperature fluxes.

Scientists detailed their work in the journal Nature Communications.

ENERGY TECH
First basic physics simulation of impact of neutrals on turbulence
Plainsboro NJ (SPX) Jul 25, 2017
Turbulence, the violently unruly disturbance of plasma, can prevent plasma from growing hot enough to fuel fusion reactions. Long a puzzling concern of researchers has been the impact on turbulence of atoms recycled from the walls of tokamaks that confine the plasma. These atoms are neutral, meaning that they have no charge and are thus unaffected by the tokamak's magnetic field or plasma ... read more

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