Plasma and fusion physics experts, help me with this one: Suppose we have a D-T plasma with net positive electrical charge inside a positively charged metal sphere. As the containment sphere's net positive charge increases, my ignorant intuition would expect the plasma to be compressed and its internal pressure to increase. Sputtering would likely occur as electrons from the plasma escape and are drawn towards the containment sphere, releasing atoms from the containment metal into the plasma and cooling it - but ignore that for a sec. Suppose we could both arbitrarily increase the temperature of the internal plasma and the charge of the containment sphere. Would this be a viable means for nuclear fusion containment?
Help me shoot down this idea. What are some practical limitations that would prevent this from working? For starters, at arbitrarily high positive charge, the containment medium itself would disintegrate due to the electrostatic repulsion of atoms in the containment vessel, correct? Is there any existing means of calculating charge distribution in a plasma or solid at very high positive charge? Or is there a means of calculating the theoretical spatial gap between the plasma and containment vessel in such an arrangement?