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Yet Another Method Of Achieving Nuclear Fusion
deglr6328 writes "Recent research has seen the use of the pyroelectric effect, the compression of bubbles using ultrasound and gas jet irradiation for producing nuclear fusion on small tabletop-scales. Yet another method can now be added to the list which uses ultraintense laser irradiation striking a borated plastic target to heat a plasma to billion kelvin temperatures and achieves aneutronic (clean) proton-boron fusion. (The PRL paper can be read online.) Though, like the other recently discovered exotic methods of attaining fusion, it does not look like a method which can be scaled up to ignition or even anywhere near break even, it still may have important use in the laboratory for the examination of such incredibly high temperature plasmas."
YAMOANF: Yet Another Method Of Achieving Nuclear Fusion
Or in short YANF: Yet Another Nuclear Fusion
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With the rapid increases in solar and wind and geothermal and hot fractured rock and wave/water energy anyone searching for fusion as a way to provide power is just searching for a solution without a problem.
Really? Have you done the equations for how powerful those methods are? Geothermal is probably the most promising, but the others simply don't generate that much juice. For example, the most powerful windmill in existence can climb to about 10 megawatts. In comparison, we've got quite a few nuclear plants up in the Gigawatt range.
Basically, none of these "alternate energy technologies" has sufficient power density to be a replacement for existing powerplant technologies. I realize that many people are wowed by the impressive size of some of the solar and wind farms, but it's very important to put them into perspective. As power density goes, they suck in comparison to a real powerplant. As power production goes, they simply don't have enough power generation area to produce an output similar to that of existing plants.
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Hey? Cars that run on electrolysed water - hydrogen cars - are all about moving the energy usage, instead of burning fossil fuels in the middle of cities on a road in an inefficient motor, use hydrogen cracked from water by a very efficient fossil fuel/whatever generator somewhere away from the city.
Of course cars running on electrolysed water, that make it from the energy they produce by burning the hydrogen from said water won't work, at least until we manage to get a perpetual motion machine working.
But does any of that mean fusion is bound to fail? A lot of people who are a whole lot more knowledgable than I am don't think so.
"Tabletop fusion isn't going to happen"
The parent comment sounds similar to a lot of other myopic things people have said that turned out to be wrong, (i.e.: We can't fly, the world is flat, the sound barrier can't be broken, etc). Nobody remembers the names of the idiots who said these things.
If there is anything an education in science has taught me, it is that we humans have a pretty tentative grip on how things work, and there sure is a lot that we have to learn. Speaking of the strong nuclear force as though it were some insurmountable obstacle is ignorant.
Today's insoluble riddle will be tomorrow's household appliance.
When I read things like this I have to wonder if there aint uses for fusion beyond the current power station paradigm. I mean productive uses, not research uses. Maybe there's medical uses for neutrino sources or remote sensing uses. And how about fusion rockets? Surely making leaky (but directed) plasma containment is adequate to make fusion powered rockets. You don't even need ignition.. supplying more energy than you get out is fine, as long as you supply the starting energy on the ground and reap the output energy whilst in the air.
How we know is more important than what we know.
Why does a Hydrogen Bomb produce far more energy in the fusion phase than is put in during the fission phase? My only guess is that the extra energy is coming from the energy released by the nuclear bonds during the forceful disintegration of the atom. Any physics majors care to chime in?
Ever wonder why all those protons like to sit happily in the nucleus together even though they're all positively charged? Well it turns out that at REALLY small scales there is a force called (aptly) "the strong nuclear force" which is about a million times as strong as electromagnetism.
The amount of energy it takes to liberate a single nucleon from a nucleus is called the "binding energy per nucleon". . For different elements this value is different. The reason fusion and fission can both release energy is due to change in this binding energy per nucleon from the start of the reaction to the end of the reaction.
If you look at this graph you will see that at the begining of the graph it rises very steeply. The change from Hydrogen to Helium looks about 10MEV. This energy has to go somewhere and it's released as heat and light.
At around Iron the graph flattens out and then slowly starts to decend. Uranium sits right down at the bottom tail of the graph. Energy is released in fission because the end products sit further up the curve than Uranium.
Per reaction, Uranium fission produces a lot more energy than Hydrogen. Fission release around 250MeV and fusion releases around 17.6MeV. So why do we get so much additional power from a Hygrogen bomb? Well one mole of Uranium weighs 238 grams. In contrast, one mole of hydrogen weighs only 1 gram. The conclusion? We have a lot more hydrogen atoms per unit mass than we do Uranium. This means that we get 17 times more energy per unit kilogram than we do from Uranium . This is the reason the primary power source for the Hydrogen bomb is the Hydrogen and not the Uranium starter charge.
Simon.
Mr. Kelvin would be dissapointed too because you post isn't the first. Mr. Celsius is already 273.15 posts ahead.
"Let us assume for the sake of argument, that we have implemented a form of nuclear energy production that leaves something relatively harmless behind, such as helium. When this process is put into practice the world over, the effect on our environment could be Very Bad"
Uhhhhhh......why? I really think the new agey "everything humans do besides sitting in a ditch poking berries up thier noses is UNNATURAL AND THEREFORE EEEEEVILL AND BAAAAAD" nonsense is really dangerous magical thinking. We can't go back to the stone age just to make sure every last chipmunk lives a happy healthy full life and its just ludicrous to think so. Just because something is not cuddlyfuzzycute doesn't mean that it MUST somehow harm the planet. Helium is not a greenhouse gas, it is not an ozone depleting gas and it is TOTALLY inert. There is a reason its called a noble gas. I think we CAN manage Earth's resources wisely and we CAN produce the vast energies that will be required for the next stage of human civilization on Earth and we CAN do it without destroying the planet if we just use our heads and rigorously apply the scientific method.
- "Hear that?! The percolations are imminent! Cease your ingress!"
Talk about hyperbole! Jeez glass houses an' all that. I find it funny and sad that responses to my post automatically assume that I must be some Rush Limbaugh loving anti-environmentalism dittohead jackass because I posted from a skeptical viewpoint and attacked illogical/fuzzyheaded magical thinking. Hint, I voted for Kerry (albiet grudgingly since I am more libertarian than democrat). I am fully for the reasoned and rational conservation and management of the environment so long as it is dictated very strictly by scientific knowledge and inquiry. What irritates me is when some unscientific Mother Gaia worshipping dolt goes on about how any technological progress beyond what we already have now is bad and wrong! :(
As a skeptic and a liberal I think it is sad that justified attacks on irrationality and anti-science nonsense are immediately seen as being synonymous with "an attack on the left". I hope it is not the case that "the left" has become so inextricably associated with the emptyheaded irrational brand of environmentalism that this is how it is seen by all other political groups, though judging from posts here, I fear this may indeed be the case.
- "Hear that?! The percolations are imminent! Cease your ingress!"