Experimental Chamber for Evaluation of Exploding Dust (ExCEED)
The ExCEED experiment is a standard 20-liter spherical dust combustion test chamber from the Kühner Company. The spherical chamber is housed inside a glovebox so that hazardous dusts can be safely tested. When fusion reactors operate, some of the wall material is eroded from the solid surface, making dust particles. Many types of finely divided metal powder or dust are explosive in air, for example iron, vanadium, aluminum, copper, and others. If the fusion reactor has a loss of vacuum, the dust from plasma erosion of the wall armor and inrushing air could create a combustible mixture. ExCEED measures the explosion indices of fusion-relevant dusts.
The ExCEED experiment. Note the spherical test chamber in the left side of the glovebox. The yellow flammables cabinet is used to store the igniters used in testing dust combustion.