Just idle musing you understand; but I wonder what would happen if you built eight, (or six, or four) Tokamak type devices and arranged them standing on their sides in a circle, with one side of each donut shaped device cut so that the plasma torus developed within each devices circular magnetic field intersected in a central magnetic 'pinch' chamber. Like in the two diagrams below.
Given that if the right conditions are created, Nuclear Fusion can and has been achieved within Tokamak type devices, but not enough to match the power input; if the plasma contained within each of the six toroids of plasma was run up to near fusion temperatures, by running six plasma streams together at a central point in a open ended 'pinch' type magnetic containment chamber, would that create conditions of heat and pressure sufficient within said magnetic 'pinch' chamber to induce a near-continuous Nuclear Fusion reaction without quite such a massive amount of initial energy input as ITER or other similar projects?
Supposing that the right hydrogen / deuterium fuel mix is injected into the eight (or six, or four) plasma toroids the rest is down to creating the conditions where such a reaction will make place. Heat, pressure, velocity, and leave the rest to the laws of Physics.
Of course my idea could be complete rubbish, but given what I've read recently, it sounds just as likely than some of the other concepts I've read about. In the words of Lewis Carrol's White Queen "If you can believe six impossible things before breakfast."
Back to Manuscript revision.