Hieler: I already had a lot of knowladge on plasma. I knew it was a state of matter, and I knew it can be contained in a magnetic field, and I knew that there have been experiments to make "cold plasma". All before I did any online research on the substance. The online research I did just increased my knowladge. Your comment did not contribute to this conversation.
Insane alien: Good point. I'll need a container for the turrets. But I don't intend on cooling the plasma from the weapons down at all. But I need to cool the plasma off just enough so the ship doesn't melt. Or add a heat shield, which will increase the mass of the space craft. For the weapons, it's clear that I will have to build a shell. The plasma will be made from hydrogen. It's an explosive gas as it is, theory: turn it to plasma, hit an object at about 1000 feet per second, you'll get an extreamly hot, extreamly explosive substance all over that area. Not to mention the debris from the shell. The problem is, would it explode before it looses it's electrons? If so, under what conditions?