Dusty plasmas are beautiful.

In Fusion reactors, dust and dirt of any kind are a problem. They instantly become charged and radiate energy through braking radiation, more catchily named bremsstrahlung.

But look at what else they do. Since the dust particles have some of their electrons stripped off they all become positively charged and repel each other. If they’re confined to a small volume they are forced to adopt them minimum energy configuration as mentioned in the previous post.

Have a look at this fascinating experiment at Michigan university. They get some wonderful footage

 

No dust for Fusion experiments though. At JET they bake the reactor at up to 320C for hours to remove gasses which have attached themselves to the walls. Yes gasses can stick to steel.