Some fuels have ashes with very high ash fusion temperatures.

Addition of a little limestone will usually suffice for the lowering the fusion temperatures.

If you tried to reach him via stepping discs, you would be heated to fusion temperatures.

And it'd take heat, like on the order of fusion temperatures.

The acceleration of the electrons about the magnetic field lines heats the nuclei within the plasmoid to fusion temperatures.

The cone of the fu- sion drive approached fusion temperatures.

The lasers would vaporize the glass causing an implosion violent enough to heat the hydrogen to fusion temperature.

A plasma jet shot out from one of its nodules, blindingly bright, the hydrogen heated to fusion temperatures.

Although the new configuration only operated "cold", far below fusion temperatures, the results were promising and demonstrated all of the basic features of the ST.

Based on fusion temperature,they are classified into three types: