Ignition Omission: Understanding the National Ignition Facility Milestone also accompanying video presentation.
- The actual device input energy that the Lawrence Livermore National Laboratory omitted in its December 2022 announcement.
- The real-world significance of fusion ignition/scientific breakeven.
- The gap between the ignition result and the energy needed for device breakeven.
- The extremely brief duration of the fusion reaction.
- Why the claims that fusion is an “unlimited, abundant” source of energy are not true.
- That one of the two required fuels for most nuclear fusion concepts does not exist.
- That there currently are no good ways to make tritium.
- Visually, how far away this fusion device is from becoming a practical source of energy.
Frankly, just the first objection looks as most significant one for me. Why? From the NIF history graph follows that latest achievment was done by assisting laser fusion by discharge of coil surrounding the fusion cell. This would create magnetic field impulse which would compress plasma by mechanism similar to pinch fusion. And then there is the problem, that we don't know, which amount of input energy/electricity has been actually used in this impulse.
Which is because the output laser array energy (which is an impressive piece of technology by itself) can not be increased too much anymore. So that everyone could assume, that the whole increase of fusion yield was done without contribution of lasers. But the energy which one can put into magnetic pulse and pinch can be increased nearly arbitrarily and it can easily exceed the amount of energy delivered by lasers by order of magnitude. This is because the laser array has rather low net energy efficiency, whereas the powering of solenoid required just a capacitor bank, the size of which can be increased arbitrarily. And one megajoule shot from capacitor bank is nothing spectacular here, for instance the Z-machine delivers 20 MJ into shots regularly.
One should expect that there is strong political pressure to keep the investments into USD 5 billion NIF facility running and this facility consumes one billion every year in addition. So it may be easily possible, that NIF facility was silently redesigned from laser fusion to Z-pinch machine and most if not all the ceremonially announced increase of output power actually comes from energy introduced into pinch, not from fusion reaction itself. The laser array is there just for illumination of Z-pinch discharge, literally speaking.