Lockheed Martin’s Compact Fusion Reactor

Point out news stories, on the net or in mainstream media, related to polywell fusion.

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ladajo
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Re: Lockheed Martin’s Compact Fusion Reactor

Postby ladajo » Thu Aug 02, 2018 12:49 pm

Increasing magnet power has an exponential diminishing return. It is somewhat of a red herring in regards to more magnet means better fusion with better containment. The real containment happens with adiabetic behaviour.
Just saying.
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)
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paperburn1
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Re: Lockheed Martin’s Compact Fusion Reactor

Postby paperburn1 » Thu Aug 02, 2018 1:39 pm

So, in layman's terms, larger would be better
I am not a nuclear physicist, but play one on the internet.

dnavas
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Re: Lockheed Martin’s Compact Fusion Reactor

Postby dnavas » Thu Aug 02, 2018 2:47 pm

ladajo wrote:I also have to wonder about patent overlap with Polywell. Afterall, it seems to me that there is significant prior art in the concept of pinched cusps, be they line or point.


Could be an attempt to pry out what you're up to? If it isn't, I'd like to use it as such :D

ladajo
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Re: Lockheed Martin’s Compact Fusion Reactor

Postby ladajo » Thu Aug 02, 2018 3:37 pm

paperburn1 wrote:So, in layman's terms, larger would be better


More B Field is better, to a point. And that point is probably closer than most realize.
Think in terms of squeezing something between your fingers, you reach a point quickly where more squeeze does not produce more results other than your effort.

The sheath of the plasma is really where the fun happens. And it is driven by circulating currents in the sheath creating their own B Fields.
This is a very complex system where everything is seeking its own balance. It is, IMHO, the epitome of a chaotic system.
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)

What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)

Diogenes
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Re: Lockheed Martin’s Compact Fusion Reactor

Postby Diogenes » Fri Aug 03, 2018 8:59 pm

ladajo wrote:
paperburn1 wrote:So, in layman's terms, larger would be better


This is a very complex system where everything is seeking its own balance. It is, IMHO, the epitome of a chaotic system.



Aptly put.

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MSimon
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Re: Lockheed Martin’s Compact Fusion Reactor

Postby MSimon » Tue Aug 07, 2018 8:24 am

I have done some rather simple calculations that show that for a given number of amp-turns making the device smaller increases the power inversely. i.e. half the size doubles the power.

Smaller is better.

Where this gets good is in Polywell rockets. And for rockets smaller is intrinsically better.
Engineering is the art of making what you want from what you can get at a profit.

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Re: Lockheed Martin’s Compact Fusion Reactor

Postby MSimon » Tue Aug 07, 2018 8:35 am

There is a problem with cylindrical reactors.

https://arxiv.org/pdf/1808.00622.pdf

Examining plasma trapping from the context of energy equilibrium yields new perspective on MHD independent of plasma microdynamics, a suggestion as to the form of equilibrium energy distributions and guidance as to how to construct plasma traps with better performance than the cusp- and mirror-derived devices commonly in use. We also see that the MHD equilibrium holds for systems with a magnetic null such as magnetic cusps. Gauge invariance, an intrinsic feature of the electromagnetic system, leads to the observation that the θ component of the vector potential in cylindrically symmetric neutral plasmas acts against confinement. A future paper will examine the design of an optimal trap for a force-free plasma.
Engineering is the art of making what you want from what you can get at a profit.

hanelyp
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Re: Lockheed Martin’s Compact Fusion Reactor

Postby hanelyp » Tue Aug 07, 2018 11:40 pm

MSimon wrote:I have done some rather simple calculations that show that for a given number of amp-turns making the device smaller increases the power inversely. i.e. half the size doubles the power.

Smaller is better.

Where this gets good is in Polywell rockets. And for rockets smaller is intrinsically better.

Except that half the scale gives us 1/4 the cross section for coils, and corresponding amp-turns. Maybe even worse once shielding is accounted for.
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