Author Topic: Fusion with space related aspects thread  (Read 608026 times)

Offline Cinder

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Re: Fusion with space related aspects thread
« Reply #2880 on: 10/07/2017 05:41 AM »
Beryllium's announced for later this year and that's supposed to be free of impurities.  Ostensibly once the Beryllium part's installed they will not remove it (?)
The pork must flow.

Online sanman

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Re: Fusion with space related aspects thread
« Reply #2881 on: 10/07/2017 06:06 AM »
Once you go Beryllium, you can't go back - anything else is a step down.

But once they go to Beryllium, they've got no more excuses in regards to impurities, since Be's nuclear cross-section is so low. From there they have to achieve their confinement potential, in order to justify switching to p+B11.

On the other hand - what if LPP achieves enough confinement potential to justify using Helium-3? That too is aneutronic, while having the lower Coulombic repulsion. That would then dovetail nicely with the renewed interest in returning to the Moon, and might help subsidize the cost of doing so.
« Last Edit: 10/07/2017 07:07 AM by sanman »

Offline Elmar Moelzer

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Re: Fusion with space related aspects thread
« Reply #2882 on: 10/08/2017 05:16 PM »
Princeton Satellite Systems have released their final NIAC Phase 1 report:
http://www.psatellite.com/wp-content/uploads/2017/10/NIAC_Thomas_FusionToPluto_PhaseI-distrib.pdf

Offline aceshigh

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Re: Fusion with space related aspects thread
« Reply #2883 on: 10/09/2017 01:44 AM »
Princeton Satellite Systems have released their final NIAC Phase 1 report:
http://www.psatellite.com/wp-content/uploads/2017/10/NIAC_Thomas_FusionToPluto_PhaseI-distrib.pdf

Interesting.

Would like to see mission parameters (days, total mass) to closer targets, like Mars and Jupiter.

Offline Elmar Moelzer

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Re: Fusion with space related aspects thread
« Reply #2884 on: 10/09/2017 02:52 PM »
Would like to see mission parameters (days, total mass) to closer targets, like Mars and Jupiter.
They did some work on this a few years ago. This is using older data and IMHO transfer times with 6 DFDs were still quite long. Overall system mass is relatively small, though( small enough to fit into 1 SLS or 3 FH launches).
http://support.psatellite.com/research/IAC_DFD_2014.pdf
With BFR, they could add more DFD engines and make the transfer even faster :)

Online sanman

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Re: Fusion with space related aspects thread
« Reply #2885 on: 10/10/2017 09:53 AM »
https://www.nextbigfuture.com/2017/10/lpp-fusion-claims-to-have-achieved-nuclear-fusion-confinement-record-of-200-kiloelectron-volts.html

2 billion kelvin?

Here's the IEEE Spectrum article being cited:

https://spectrum.ieee.org/energy/nuclear/startup-lppfusion-embraces-instability

Quote
Still under peer review as of press time was a paper submitted to the journal Physics of Plasmas, in which Lerner and his coauthors claim to have produced a confined mean ion energy of 200 kiloelectron volts, equivalent to a temperature of over 2 billion kelvins. ďAs far as we know, thatís a record for any fusion plasma,Ē Lerner says.

That sounds like a temperature even greater than was achieved at the Z-Pinch machine at Sandia National Labs.

Hypothetically, if the Dense Focus Fusion approach could be made to work, then how could it most effectively be used for spacecraft propulsion?
Since it uses aneutronic fusion, which minimizes the radiation hazard, then could it be feasible for propelling a launch vehicle from Earth to Orbit? If so, then what would that propulsion system look like? Could that fan-rocket concept from John Bucknell be driven by Dense Focus Fusion power?

Offline Elmar Moelzer

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Re: Fusion with space related aspects thread
« Reply #2886 on: 10/10/2017 02:37 PM »
Hypothetically, if the Dense Focus Fusion approach could be made to work, then how could it most effectively be used for spacecraft propulsion?
Since it uses aneutronic fusion, which minimizes the radiation hazard, then could it be feasible for propelling a launch vehicle from Earth to Orbit? If so, then what would that propulsion system look like? Could that fan-rocket concept from John Bucknell be driven by Dense Focus Fusion power?
George H. Miley did several studies on how the DPF could be used for space propulsion. This paper here also gives a brief outline on how this could be used for a SSTO launch vehicle:
https://www.scribd.com/presentation/18992621/ADVANCES-IN-DENSE-PLASMA-FOR-FUSION-POWER-AND-SPACE-PROPULSION-with-George-Miley-Ph-D

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