Dr. Bussard Passes Away, Polywell Fusion Continues 79
Vinz writes "Dr Bussard, the man behind the Bussard Collector and inventor of the Polywell fusion device, passed away last Sunday in the morning. He leaves behind him a legacy of EM fusion devices, and a team determined to continue his efforts. The news of funding extension for the construction of his WB-7 fusion devices made it to slashdot months ago (as well as his talk at google). They may be a serious candidate in the run to bring commercial fusion, and may work at lower scales than other projects. Let's hope the project continues in good shape despite his departure."
Aw, man... (Score:1)
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Re:Aw, man... (Score:5, Insightful)
Larry Niven & the Bussard Ramjet (Score:1)
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ideas are cheap (Score:2)
His work on the Polywell is different: there h
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Final arrangements for his body. (Score:4, Funny)
Re:Final arrangements for his body. (Score:5, Funny)
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No! *smack* Bad 6Yankee, bad! No pun for you!
Read the Wiki Article (Score:3, Informative)
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A remark captured my attention (Score:2, Insightful)
http://en.wikipedia.org/wiki/Polywell [wikipedia.org] Ouch. In terms of value for money, though, gambling our money away on a wild scientific flier would be a much better investment than starting the war in Iraq.
The other thing that caught my attention was Bussard's comment that they should go straight to full scale. He may or may not be right. Most people who have been around the block more than once would be sceptical though.
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Re:A remark captured my attention (Score:5, Interesting)
It's one of the things that had the alarm bells ringing about the Polywell because it's something you'd expect from someone who wants to sell you the Brooklyn Bridge.
But I think in his case he just saw the writing on the wall. He knew he wouldn't see a full-scale reactor if it was done step-by-step, he was just too old for that.
I really hope someone with the required expertise will take an honest look at the Polywell. The concept sounds good and the central question seems to be whether the plasma will move into thermal equilibrium or not. And the paper every critic cites is one master thesis written by the student of one of Bussard's rivals for Navy funding. Hmmmm...
Now, the fact that your opponent's not trustworthy doesn't mean that you are, but I think that considering all the money that goes into ITER a few million for looking at different approaches (mostly this and lasers/inertial confinement =) are a good investment.
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My understanding is, the current work is not for a full scale reactor, it's for WB-7, a more robust version of WB-6. The intention is to validate the concept with more results and longer runnings times. If and when WB-7 has produced some solid results, the results will be reviewed and deliberated. If the results merit further work, I believe the Navy will proceed with a full-scale model for net po
Makes perfect sense to me. (Score:5, Interesting)
In this case he believed he had the scaling laws down. With power proportional to the seventh power of the radius and energy gain proportional to the fifth power, you were only talking about building a device maybe 10 times the radius of the lab device. That's TINY as fusion experiments go, and also compared to fission plants. And the thing is basically a slightly gassy vacuum tube with some magnets in it, i.e. mostly empty space, very little material.
If there are any gotchas you'd have to scale it up about that much to find them. So why go halfway and then build a full-size one when, if it turns out there AREN'T any gotchas you've got an operating power plant on the next step?
His plan was to do two more small prototypes, to get some more solid data than his three-neutron final run and compare two geometries for the final deaign, then go for the gotchas-or-gold. If it works, it gets you to production right away and you didn't spend a dime on yet another intermediate prototype. If it doesn't, you're not out all that much more than if you built some intermediate size that was maybe big enough to find the gotchas.
Suppose there AREN'T any gotchas. Then we get to working fusion power years sooner. Ditto if there are gotchas that only show up at the scale between the intermediate prototype and the full-size design. In either case the time spent on the middle-size below-break-even prototype was wasted.
Baby steps are for people who get their money from researching and will be looking for a new job once things are actually working. Big steps are for people who want to get to the finish line.
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That's a lousy policy. If we gave money to everyone who claimed all they needed was 100 times as much money as they'd ever invested in a project before, we'd be spending several times the GDP of the world on perpetual motion trash.
Which is not to say I don't think the Polywell concept is worthy of further funding, b
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Quote from GP:
the real story (Score:4, Funny)
He didn't simply pass away. He was a victim of entropy.
Electron losses (Score:5, Interesting)
Personally I think stellarators are more promising. For those who don't know stellarators are a bit like Tokamaks, except rather than relying on an electric current in the plasma to create the necessary twist to the magnetic field for confinement, they twist the confinement vessel itself ( a bit like a moebius strip ), making them a lot more stable than Tokamaks, and allowing them to operate continuously (You can't induce a DC current in the plasma so Tokamaks necessarily operate in pulses ). Main problem seems to be that since stellerators have a lot less symmetry than Tokamaks the calculations become more difficult, but if computing power continues to rise this will probably be solveable.
As a bonus stellarators look damn cool ; )
http://www.efda.org/pictures_html/stellarator_schema_and_live.jpg [efda.org]
http://www.psl.wisc.edu/hsx.jpg [wisc.edu]
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Re:Electron losses (Score:4, Interesting)
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Re:Electron losses (Score:5, Interesting)
From Maxwell's equations div B = 0, so magnetic field lines cannot suddenly stop, and thus magnetic fields alone cannot confine charged particles in a plasma which has the same topology as a sphere ( a charged particle that travels along a magnetic field line will escape the confinement ). Consequentially you WILL have electrons leaking out of the magnetic mirrors, and this effect will increase as the potential well height increases.
Tokamaks and Stellarators don't have this problem because they are topologically equivalent to a torus, and thus their magnetic field lines can completely enclose the plasma, while simultaneously not penetrating the plasma facing components.
There are further problems with the polywell design. As an example, even at optimal energy levels the reactants will fail to fusion in many of the collisions, and thus the ions will thermalise much quicker than they fuse. Bussard claimed he could avoid thermalisation of the ions, but this is simply not possible in the polywell design since it would require a spontaneous process to transfer energy between the ions in such a way that their overall entropy decreases. While the polywell is not a closed system, and thus not subject to the second law of thermodynamics, there is no meaningful energy input other than the initial potential energy of the ions, and thus for thermalisation to be avoided there would have to be a large entropy flow out of the plasma, and thus it would quickly cool to levels bellow that required for meaningful fusion. In short, you will rapidly get thermalisation of the ions, which in turn leads to X-ray losses from the electrons. If you did heat the plasma, by say injecting microwaves or neutral particle beams, it would still not avoid the problem of thermalisation unless you managed to selectively accelerate the low energy ions, while simultaneously slowing the fast ones ( and of course, if this energy exceeds the fusion power, as it will have to do in order to overcome the speed of thermalisation, then you won't get net energy out of the device ).
While we are at it, no, you are not going to produce a Boron plasma with any significant number density without getting electrons in it, just calculate the electrostatic force you would get on an electron outside the device from 1 mole of boron nuclei and you quickly see that this is absolutely impossible. Even if the proton/electron ratio is just 5/4, Q = N_a, so you are talking roughly 6*10^23 times the proton charge ( or 60 million Coulomb ).
You then have to take into consideration other problems, like sputtering of plasma facing compounds, giving impurities that cool the plasma ( and since all potential plasma facing compounds have Z numbers of 6 or above, this will further increase X-ray losses ). There is no proposed way to design a divertor, so the device could most likely not operate for extended periods of time.
Basically I don't see this getting a confinement time even close to that of a Tokamak or Stellarator. The number density will be dramatically less ( since it is limited by the height of the potential well ), and it just doesn't seem likely you will get even close to the lawson criterion. Granted, you don't need to achieve ignition in order to extract a lot of energy, but you won't get a high value of the nTtau triple product without raising T to very high energies, which impacts the amount of energy you can gain.
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Re:Electron losses (Score:5, Interesting)
Instead of producing lengthy expositions about the flaws of technologies that you don't understand, why don't you try learning about them instead? From your post, it is clear that you neither understand, nor have you read any of Dr. Bussard's papers on the subject. Given the topic of this story, you could at least have enough respect to do so, before spreading FUD about ideas.
First of all, no one is claiming that the divergence of a magnetic field is non-zero. The fact is, the "wiffle ball" trapping of electrons in a Polywell is more than adequate for the task. Electrons escaping through the cusps do not equate to losses, as they usually follow the field lines right back into the machine.
In any case, it is highly disingenuous to claim that a Tokamak has no difficulty confining a plasma. While the topology of a Tokamak (or a dipole as in the LDX) may be a better configuration for containing charged particles, this ignores the fact that the ions have a much greater mass. After a number of collisions, it is inevitable that they will smash into a wall. The only solution to this problem is to make the machine bigger, but it is still far from ideal.
Your calculations concerning a Boron plasma are complete nonsense; as described in his recent paper, only a slight deviation (1E-6) from neutrality is necessary to make a well nearly as deep as the drive energy.
Overall, there are at least as many, if not more challenges, in producing a commercially viable Tokamak. I won't discount either approach yet, but the Polywell certainly looks a lot more promising. A quasi-spherical potential well simply seems like a much better place for a sustainable fusion reaction than a divergence-less B field. Wether or not it works out, it certainly deserves more attention and less unfounded condemnation.
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Well I have seen Bussard's alleged explanation for why he can maintain a non-maxwellian velocity distribution, and quite frankly, it can't work. He seems to argue that there is a spontaneous process in the system which restores the non-maxwellian distribution because the ions thermalise at low energies at the perimeter of the device. However:
a)Restoring a particle
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a)Restoring a particle distribution to a non-maxwellian energy distribution requires work. It doesn't matter how you do it...
And your missing the same thing Rider did. Thermalizing a distribution is just nature. Because of the inherent design of all IEC devices, ions spend >90% of their lifetime in the outer
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Then you've plainly not looked at Bussard's design on even a classical physics level, as he agreed with you. The magnets are held at a high positive potential and electrons are allowed to exit through the cusps and be dra
Re:Electron losses (Score:5, Informative)
And Bussard insisted that Rider's math model was flat out wrong. Recent experiments by Yoshikawa and MIT have both demonstrated that Rider's model is, in fact, wrong.
The Polywell design has tremendous merit to it and the experiments that Bussard managed at the end of his life were successful in measuring fusion scaling factors and electron loss factors. From those experimental results Bussard's team rushed together what was expected to be their last device in WB-6. On analyzing the data it generated, it achieved record breaking fusion rates. Now that the navy has re-funded his team to finish WB-7, expect to see some big announcements in a year or so.
For more on Polywell theory and background go here. [talk-polywell.org]
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WB-6 ran for a short time and a few neutrons were caught in a detector. The estimated fusion rate is an extrapolation that I am not entirely comfortable with. The statistics simply are not there, nor do I agree with the claim t
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I've been through Rider's paper too. He essientially claims that ALL IEC devices of any sort can not maintain a non-maxwellian distribution. However, there is no basis for using the math models of particle distributions that he uses other than that they make the math easier. Read Rostoker
Oh ho, someone died (Score:4, Funny)
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Oh, wait, goatse, nevermind
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Mod insightful pleeze.
may work at lower scales? (Score:4, Informative)
Re:may work at lower scales? (Score:4, Informative)
Actually, they initially designed it with permanent magnets and drove the electrons right into the magnets themselves. But the point was to prove electron densities in the center could get high enough for fusion. Regardless of the mistakes made along the way, the got the concept to work for their final tests and expect some big results from the new WB-7 some time next year.
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Bussard never claimed smaller scale tests should be skipped all together. In the google talk he comes off as an academic intent on his field, not a nut. His proposed plan always was the construction of WB-7 and WB-8 devices in ~1 year, but that a committement to the full size device should be made in order to higher good people, since good people
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Sorry, you've got your timeline messed up but good. WB-6 was built in a rush when the team's navy funding had already been terminated(as a smaller part of a R&D line item cut). The hope was that it would reduce electron losses as they
Warp Factor 11 (Score:3, Interesting)
In principle, the Bussard ramjet avoids this problem by not carrying fuel with it. An ideal ramjet design could in principle accelerate indefinitely until its mechanism failed. Ignoring drag, a ship driven by such an engine could theoretically accelerate arbitrarily close to the velocity of light, and would be a very effective interstellar spacecraft.
So what would happen to people or computers travelling inside the ship?
Would they move forward through time at accelerated speed? or end up in deep-space oblivion?
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http://en.wikipedia.org/wiki/Tau_Zero [wikipedia.org]
Read Tau Zero for an extreme answer (spoilers) (Score:3, Interesting)
Godspeed, Doc. (Score:5, Funny)
Wee, this is very bad. (Score:1, Interesting)
And Known Space Cried (Score:2)
His presentation at Google (Score:1)
Passed away? Where'd he go? (Score:2)
Leslie Woods (modeling problems) (Score:1, Interesting)
I know it is a bit off topic, but seeing as we are discusing confinement, I would love to hear someone comment on Leslie Woods' (a late mathematician from Oxford) equations. Basically, from what I understand from the Nerenberg lecture he gave [apmaths.uwo.ca], he claimed that the majority of the gap between what the equations predict and what is observed in reality is not due predominantly to missing turbulence, but rather to a missing non-turbulence term.
Unfortunately, from what I understand of what he said, despite his
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This guy dreamed big. (Score:2)
After reading through the presentation and arguments above I have not no hope that his polywell device will work. I guess we might have more info some time next year.