I am pretty convinced that the humungous Tokamak that ITER is going to develop will work. The .pdf posted earlier - thanks Phyzguy - shows the logarithmic increase in plasma confinement time with size. "Bigger is better" is the name of the game.
If the physics works the engineering can be...
As with all engineering processes, shutdown is a test of design.
How will ITER react to a shutdown or more seriously failure?
Most of us are aware that when stars die they do so catastrophically.
This is in fact a "star" which is going to die.
Maybe it's not big enough but everything...