asymmetric_implosion wrote: How do you stop erosion and redeposition? Stopping erosion is impossible so it must be minimized.
I think the welding industry has a solution that may work. Feed wire. If you have a materials problem, sometimes mechanical engineering can solve it. Let it erode away, provide a flow of gases to carry away deposits before they solidify, and shape the electrodes so that they can be fed in at a constant rate. I am not sure of current switch design though.
There may be many design opportunities that present themselves. Solutions that were never thought of before since they have lacked any real incentives.
