More Helion Energy news....

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

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Skipjack
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Re: More Helion Energy news....

Postby Skipjack » Fri May 17, 2013 11:47 pm


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Re: More Helion Energy news....

Postby crowberry » Fri Oct 25, 2013 7:29 pm


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Re: More Helion Energy news....

Postby ogiw » Sat Oct 26, 2013 7:07 pm

Any news from Helion is most welcome. However, I've lost track; is this one the IPA-HD or the Component Test Facility? Or, has a more up-to-date project plan been published that I missed?
No one of consequence.

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Re: More Helion Energy news....

Postby Skipjack » Sat Nov 16, 2013 3:44 am

A more recent video about their current work (summer):

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Re: More Helion Energy news....

Postby djolds1 » Wed Nov 27, 2013 7:26 am

Vae Victis

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Re: More Helion Energy news....

Postby D Tibbets » Thu Nov 28, 2013 3:35 am

Uranium is very heavy. I don't know if any fission could be utilized and what it's contribution would be to the temperature of the plasma. But from an ISP, efficiency viewpoint the ISP is inversely proportional to the square root of the mass of the ejecta. ie: trituim/ helium 3 fusion products have a mass of 3, and lithium a mass of 6 or 7. Uranium or uranium fission products have a mass of ~ 100 to 238. The square roots of those numbers is ~ 2 to 2.5 versus 10- 15. This means that if uranium is used as a major component of the ejection mass, then the ISP would be ~ 6 times less. Instead of an ISP of perhaps 2400, it would be ~ 400 (at the same temperature)- not good . There might be more power- ie: more thrust and thus faster acceleration, but the total accelleration would be ~ 6 times less.

Near the bottom of the link, some of the numbers are interesting. Confinement times of ~ 100 micro seconds- or perhaps up to several milliseconds at densities of ~ 10^22 particles/ M^3 (?) are promising. But the temperature of ~ 2.3 KeV still needs to be increased perhaps 10 fold or more. The D-D fusion cross section is ~ 500 to 1000 times less than the cross section at the higher temperature. Just to exceed the Bremmstruhlung losses with D-D fusion fuel a minimum temperature of perhaps 8-9 KeV is needed. The rocket engine is not a power source . Apparently solar panels provides the power. The engine also does not appear to match the VASMIR ISP capabilities, but perhaps it provides greater thrust levels (pounds of thrust), and acceleration rates are very significant when talking about low thrust engines and travel time. As an externally powered rocket engine this may be closer to the best compromise. Note that Miley has proposed a Fusor as a rocket, better ISP than an ion (Hall effect?)rocket, perhaps a little more thrust and not much, if any weight penalty. Miley's proposal is for maneuvering thrusters on a satallite. I don't know how much more thrust this FRC or VASMIR can provide (limited by the input power from solar sails or thermal nuclear batteries, fission reactor, of ideally a fusion reactor like Bussard's concept, or a successful DPF or FRC system with net positive energy production.

Note that by my understanding, a Polywell operates at up to ~ 10 times greater density and perhaps 10 times or more confinement times as those mentioned in the link. It may also have significantly greater capacity to heat the plasma to higher temperatures, benefiting the triple product considerations, and the capacity to exceed the losses due to Bremmstruhlung. Not only is there upper limits where Bremmstruhlung losses overtake fusion rates (especially important in the P-B11 reaction), but there are also lower limits where the lower fusion cross sections trail behind the Bremmstruhlung rates. Bussard gave values of ~ 5 KeV for D-T fuel, ~ 12 KeV for D-He3 fuel, and I extrapolate ~ 8-9 KeV for D-D fuel. I suspect the minimum for P-B11 fuel is closer to 20 KeV or more. Consideration of thermalized vs non thermalized conditions complicates the situation further.

Dan Tibbets
To error is human... and I'm very human.

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Re: More Helion Energy news....

Postby djolds1 » Thu Nov 28, 2013 3:25 pm

Vae Victis

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Re: More Helion Energy news....

Postby crowberry » Tue Mar 11, 2014 7:48 am


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Re: More Helion Energy news....

Postby Skipjack » Tue Mar 11, 2014 1:42 pm

Very cool!
Does anyone know, whether they got additional funding out of that?

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Re: More Helion Energy news....

Postby mvanwink5 » Tue Mar 11, 2014 3:58 pm

Near term, cheap, dark horse fusion hits the air waves, GF - TED, LM - Announcement. The race is on.

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Re: More Helion Energy news....

Postby Skipjack » Mon Jul 14, 2014 6:30 pm


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Re: More Helion Energy news....

Postby zapkitty » Mon Jul 14, 2014 7:14 pm


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Re: More Helion Energy news....

Postby crowberry » Mon Jul 14, 2014 8:17 pm


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Re: More Helion Energy news....

Postby Skipjack » Mon Jul 14, 2014 8:37 pm


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Re: More Helion Energy news....

Postby MSimon » Mon Jul 14, 2014 11:24 pm



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