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Comment by aradox66 | Hacker News Reader

What's the weapons angle for sustained fusion research? We've had the tech to reliably turn heavy water into 100 million casualties per warhead for >50 years.

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probably because they can't test nuclear bombs anymore so this is alternative to gain any any new knowledge that puts US ahead of the rest? just look up NIF its a facility for weapons research

"It supports nuclear weapon maintenance and design by studying the behavior of matter under the conditions found within nuclear explosions"

> 100 million casualties per warhead for >50 years.

How did you reach 100M?

The blast radius is huge, but not that huge.

Pretty much zero afaik. If anything goes wrong the reactor just fizzles out.

No fission primary stage.

Some of the implications, as far as I know:

1- A pure fusion weapon would be a "clean bomb", meaning it wouldn't emit long term radiation. Good, but bad because someone might be more willing to use it.

2- A pure fusion weapon wouldn't require a critical mass. In theory, the laws of physics don't preclude something that is really compact.

3- A pure fusion weapon would use deuterium, which is just a byproduct of heavy water. Anyone can get, or make the stuff inexpensively.

Granted, we're probably a century away from this kind of tech but if we keep getting superconductor and fusion breakthroughs it will come around sooner or later. Hopefully society will have advanced to a point where we are prepared to handle it.

point 1 is sadly wrong and I wish people would stop thinking that fusion doesn't cause radiation damage in all surrounding material.

The only thing I find more annoying that "fusion = totally 0 radiation" is the idea that it somehow will provide "free" energy. With any power plant, no matter the fuel, there will be cost of construction(with a limited lifespan) and maintenance. Same goes for distribution network.

It makes me wonder if we could improve fission reactors cost and safety, instead of performing biggest down scaling act in history of technology (700k kilometer Sun to mere meters)

I think OP meant "radioactive fallout" which would be the source of "long term radiation." Fission bombs scatter radioactive dust of uranium, plutonium, and fission byproducts that continue to emit harmful radiation for thousands of years.

A fusion bomb with no fission stage would have a massive radiation blast, but leave no radioactive fallout. 10 minutes after the bomb, radiation levels would be more or less back to background levels. Is my understanding.

Would it really be that infesaible to have a fusion bomb started by a non nuclear reaction?

Ah nice, then they'd be easy to build without detection, and proliferation treaties become unenforceable. What could go wrong?

I think my mind just changed on whether fusion energy breakthroughs would end up as a net good.

Non proliferation treaties simply mean existing nuclear states can’t share with others.

They do exactly nothing, except apply a stigma/some worthless sanctions, in the event a state decides to fucking do it themselves. See: North Korea.

The Non-Proliferation Treaty actually does bar non-weapons state signatories from developing nuclear weapons themselves, and requires them to accept IAEA safeguards to ensure they are not doing so. The issue with North Korea is that they withdrew from the NPT, then re-entered it, then when they tried to withdraw again they did not give the 3 months notice required by the treaty. They claim that their re-entry into the treaty was merely a delay in their withdrawal, and thus they didn't need to give notice again. The rest of the world disagrees, and holds they are in violation of the treaty, and has sanctioned them accordingly. Sanctions are generally the worst punishment that violating a treaty can result in, barring the few exceptions where war would be both justified and practical.

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