I was thinking about electron beams and perhaps Z machine, but I don't know where they are in comparison with other methods. At the moment, the Z-machine is producing lots of X-rays with temperatures of the wire ~1.6 million K (or about 140 eV). They need about 100 times that amount IMO - 14 keV (160 million K) for any reasonable attempt at fusion.
I wonder when they will get there?
Yes - there are lots of different proposals - all in different states of development.
Before LLNL decided on builing NIF - and all we had was Nova; which had pretty
much reached its maximum capability; I was really wondering if the inertial
confinement community would turn more to something like Sandia's Z-Machine.
It is interesting to look at all the diferent concepts. In the magnetic fusion arena,
everybody thinks about tokamaks. However, there were magnetic fusion devices
before tokamaks - simple magnetically wound torus, then the stellarator with
helical windings, also yin-yan magnets, magnetic mirror machines [ MFTF ], ...
Who knows what type of machine will be the next "bright idea"?
Dr. Gregory Greenman