Here's the paper. http://www.nature.com/nature/journal/vaop/ncurrent/full/natu... They would like to charge you $32 to look at it, nature -ally. The fusion yield is (?) 14 kilojoules (inferring this from physicist Mark Herrman's "5 million billion fusions" [WaPo], at 18 MeV per fusion), which is a moderate improvement over the 8 kilojoule achivement from last fall: https://news.ycombinator.com/item?id=6459289 [WaPo]…
cheers https://dl.dropboxusercontent.com/u/26434203/nature13008.pdf
Scientists Say Their Giant Laser Has Produced Nuclear Fusion
81–90 of 194 posts
Re: Scientists Say Their Giant Laser Has Produced Nuclear Fusion
#82Earlier quoted context omitted.
The problem with sinking a lot of money into science is that it only pays dividends if solutions to the big problems actually exist. They may not. It may in fact not be possible to do better-than-breakeven fusion on a small (relative to a star) scale. The only way to find out for sure is the hard (and expensive) way. By way of contrast, when it comes to military technology you're not competing with nature, only with…
> It may in fact not be possible to do better-than-breakeven fusion on a small (relative to a star) scale. the H-bomb is better-than-breakeven and much smaller than star scale. What you say may be true for Tokamak like confinement schemes whereis H-bomb is inertial confinement, and it works. And it is pretty clear that inertial confinement in several orders of magnitude smaller scale than H-bomb would work too. Look…
Re: Scientists Say Their Giant Laser Has Produced Nuclear Fusion
#83Earlier quoted context omitted.
The problem with sinking a lot of money into science is that it only pays dividends if solutions to the big problems actually exist. They may not. It may in fact not be possible to do better-than-breakeven fusion on a small (relative to a star) scale. The only way to find out for sure is the hard (and expensive) way. By way of contrast, when it comes to military technology you're not competing with nature, only with…
> It may in fact not be possible to do better-than-breakeven fusion on a small (relative to a star) scale. the H-bomb is better-than-breakeven and much smaller than star scale. What you say may be true for Tokamak like confinement schemes whereis H-bomb is inertial confinement, and it works. And it is pretty clear that inertial confinement in several orders of magnitude smaller scale than H-bomb would work too. Look…
http://en.wikipedia.org/wiki/Joint_European_Torus
ITER is aiming for a Q of 5 for 480 seconds:
Re: Scientists Say Their Giant Laser Has Produced Nuclear Fusion
#84Here's the paper. http://www.nature.com/nature/journal/vaop/ncurrent/full/natu... They would like to charge you $32 to look at it, nature -ally. The fusion yield is (?) 14 kilojoules (inferring this from physicist Mark Herrman's "5 million billion fusions" [WaPo], at 18 MeV per fusion), which is a moderate improvement over the 8 kilojoule achivement from last fall: https://news.ycombinator.com/item?id=6459289 [WaPo]…
I'm on campus right now and can download the PDF. I'd upload it, but I don't want to pull an Aaron Swartz. EDIT: Okay here, but I have limited bandwidth so get it while you can: https://mega.co.nz/#!CNgVhZra!JcsLGB5y0FGUffI4rdyNr-BBl82YJD...
Re: Scientists Say Their Giant Laser Has Produced Nuclear Fusion
#85Sounds like a 'needs more funding' article to me.
Re: Scientists Say Their Giant Laser Has Produced Nuclear Fusion
#86This sentiment is interesting "Over the past few years, NIF has been getting a fat 'F.'" Perhaps now that 'grade' will change. Actually, I think framing it as a grade is beyond silly; it is irresponsible. Giving a letter grade to long-term scientific project makes little sense. It is not a one-shot thing with a predefined notion of correctness. What can we compare such a grade to? Instead, we should be asking what we…
That's not enough. Learning what doesn't work is sort of useful, but only if it ever leads to something that DOES work. There's an infinite supply of dead ends out there. You need a higher bar than 'learned something' if that something is a negative.
Not really. The point of big scientific research is that at the moment a project is being conceived, no one has any idea where it will go and whether it will bring anything useful. Yet in time, it always brings breakthroughs.
I'll put it bluntly: we need more trust. The right way to do science is to keep throwing money at it, no questions asked[0]. IMO the reason we've seen so much progress during last two wars was not because war per se stimulates research, but because during a conflict the military has infinite budget and it starts throwing more money at research that can be used, so scientists can do whatever they want without justifying it for general public[1]. Free of money&management issues, creative minds could focus on doing fundamental research in whatever they felt like doing[2].
Come to think of it, science is best done in the same conditions the programming (or any creative endeavour) is - when you're free to think, don't feel the pressure of looming deadlines, don't have to deal with managerial bullshit, and when you have enough money to not have to think about it (both in life and in cost of work materials).
So yes, I advocate some kind of almost blind trust. Just throw some part of taxpayer money at R&D, no questions asked. It's a long-time investment.
[0] - Of course there's a need to build in a system to limit the amount of parasites who will feed on free money; but they ultimately cannot be avoided, we can only try to limit their numbers.
[1] - I think it was Feynman who pointed out that the problem with science in the 90's was that scientists suddenly found themselves accountable to general public and struggled with explaining why their research was useful.
[2] - If that last paragraph rings bad to you, please note that I'm skipping over a lot of points related to creativity needing to be free of trivial bullshit, intrinsic motivation beating monetary rewards/prestige in performance, etc.
Re: Scientists Say Their Giant Laser Has Produced Nuclear Fusion
#87Earlier quoted context omitted.
cheers https://dl.dropboxusercontent.com/u/26434203/nature13008.pdf
No offense to anyone, but this link should be deleted. You may not like the system, but HN isn't the place to protest IP laws with civil disobedience. A lot of YC companies have their own IP they'd like to protect I'm sure.
Re: Scientists Say Their Giant Laser Has Produced Nuclear Fusion
#88Earlier quoted context omitted.
cheers https://dl.dropboxusercontent.com/u/26434203/nature13008.pdf
No offense to anyone, but this link should be deleted. You may not like the system, but HN isn't the place to protest IP laws with civil disobedience. A lot of YC companies have their own IP they'd like to protect I'm sure.
Re: Scientists Say Their Giant Laser Has Produced Nuclear Fusion
#89> led NIF's critics to label the facility an enormous waste of taxpayer dollars > government shifted NIF away from its fusion goals to focus on its other mission: simulating the conditions inside nuclear weapons I think right there lies the problem with our world. People take up more issue with a multi-billion dollar research facility for science than one for military applications. If we spent a small fraction of the…
> we could probably solve some really fundamental world problems (i.e. energy, climate change) in the near future I have a feeling that if we had fusion plants providing limitless cheap power, we'd get back on an 8% yearly growth track for energy consumption, like with oil consumption before 1970. Then within a century or so, we'd be producing an amount of power equivalent to 20% of what the earth receives from the s…
To sum it up "Free energy" buys us about 300-400 years of growth before thermodynamics kicks our ass.
Re: Scientists Say Their Giant Laser Has Produced Nuclear Fusion
#90Here's the paper. http://www.nature.com/nature/journal/vaop/ncurrent/full/natu... They would like to charge you $32 to look at it, nature -ally. The fusion yield is (?) 14 kilojoules (inferring this from physicist Mark Herrman's "5 million billion fusions" [WaPo], at 18 MeV per fusion), which is a moderate improvement over the 8 kilojoule achivement from last fall: https://news.ycombinator.com/item?id=6459289 [WaPo]…
cheers https://dl.dropboxusercontent.com/u/26434203/nature13008.pdf
Mirroring: https://dl.dropboxusercontent.com/u/216352/bigscarylaser.pdf.