>And yet no one has invested. I'd love to know why.

investing means some ROI. There is no way to have any ROI here (to illustrate - try to imagine how you can get any ROI by investing back at the time in Einstein developing GR). They aren't going to build a lot of power plants themselves and for selling their tech - there should be some "secret sauce", and the current fusion development is at the stage when results of one team can easily be replicated by any other team (given sufficient access to money). I.e. current investing in fusion is more like scientific/humanitarian grants (and big thanks to those guys like Allen for pushing our civilization forward) than VC for profit.

For example, once a team develops high-performance sensors and software to efficiently manage say that plasma ball at the end of a DPF shot so that there would be a real power gain, that would be an item suitable for investing by VC.

Sorry, but your theory doesn't work because plenty of other fusion projects are attracting VC. There is something wrong with Lerner specifically, not fusion generally, that's stopping people from putting money in.

Sounds like a question of what kind of patent deals the investors could expect.

My dad was a navy nuke and said that the cost v safety v portability of fission was far superior to that of fusion. That was back in the 90s, so I wonder if it's still relevant, but a quick search [1] seemed to confirm the general idea.

[1] diffen.com/difference/Nuclear_Fission_vs_Nuclear_Fusion

Considering we don't have any way of currently producing an energy positive fusion reactor that can sustain a reaction, he's not wrong... but it is comparing a proven technology to one that, despite the hype, is still in its infancy. Fusion has a lot of benefits should we ever engineer a reactor successfully.

Yeah I'd be baffled if someone compared the cost and portability of classical vs quantum computers.

I think you should listen to him.

Fusion is still vapourware. For it to ever be viable outside a few niches, it will have to beat fission in price, because it will probably share many characteristics with fission plants (high capital costs, low cost of fuel, radioactive waste, huge plants).

Fusion somehow ended up being branded as the future of energy. But the prospects aren't looking good so far. Fission plants are probably already too expensive to have much of a future.

The project featured in the article, if successful, will produce no radioactive waste, fits inside a garage, and will likely be cheap overall. Unlike the well-funded laser and tokamak designs which get most media coverage and still don't work well and are unbelievably expensive.

In discussions of new nuclear technology, it's always a good idea to keep in mind the famous Paper Reactors Real Reactors document written by the architect of the worlds most successful nuclear power program.

http://ecolo.org/documents/documents_in_english/Rickover.pdf

Fusion has a huge political benefit in not being the same thing as fission. Fission isn't perfect, but it's way better than you'd think if you only looked at what we invest in. If it can be spun as a separate thing from Chernobyl/Three Mile Island/Fukushima then it might fare closer to what it should from a purely objective standpoint.

I learned during an energy project at elementary school (begin '90) a hypothetical nuclear fusion reactor would be a prime target for military action more so than fission. Tho I forgot the exact details on why, I suppose the reactor is easier damaged, whereas a fission reactor is much more difficult to cause a fallout with. Can anyone confirm that's true or false?

It's the other way around:

If a fission reactor is insuffciently cooled (due do the cooling system getting destroyed by attack or natural causes, cf the Fukushima Daiichi nuclear disaster), the reaction will continue, the core can melt and breach containment.

If a (plasma-based) fusion reactor gets damaged, the plasma will dissipate and the reaction will stop.

There isn't a single fusion power plant that puts out more energy than it pulls in, other than the Sun. It's kinda hard to compare cost, safety, and portability of something that doesn't exist to something that does.

Portability is a concern that is particular to the Navy, and I don't think anyone has suggested they switch...

Simple: people in the know realize that this technique still needs a bunch of development.

This is a good talk about the various variables you need to demonstrate in fusion: https://www.youtube.com/watch?v=L0KuAx1COEk

I understand the the issue is the unreasonable business terms.

His team has been consistently ahead of the competition on key metrics for a long time despite less funding.