Not to be mysterious, but there was a lot of arcing between metal parts in the last round of shots. Arcing vaproizes metal and unevenly adds lots of heavy metals to the plasma, so we could not test the new idea. Putting the tungsten and copper together so there is no arcing is not easy, and we have to wait in line at the machinists, who are pretty busy in our neck of the woods. So the test is yet to be done. When we get to the head of the line and get our parts back, we will be able to do it–next month,we hope.
