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Post by The Astronomer on Jun 3, 2017 10:34:14 GMT
I know most people are anticipating the 2H+ 3He, but RiftandRend made some good point about 2H+ 3H fusion as the most promising fusion. So, what should it be, then? What is the most promising fusion reaction?
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Post by RiftandRend on Jun 3, 2017 10:38:45 GMT
If 3He breeding with a net energy gain is possible then it wins by a huge margin. If not, then D+T or p+11B if the technology allows.
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Post by RiftandRend on Jun 3, 2017 11:07:59 GMT
Something to note, the reaction you have defined for D+3He fusion may be incorrect. When I calculate the activation energy it comes to 19,297,065 kJ/mol instead of the 2,122,677 kJ/mol currently there. This is assuming 200 KeV as the optimal fusion energy instead of the ~22 I assume you used.
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Post by zorbeltuss on Jun 3, 2017 13:43:39 GMT
Not most promising as easiest or first, it's just that I think that when and if humanity feels that we collectively need fusion, fourtons will ultimately be what we settle for.
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Post by samchiu2000 on Jun 3, 2017 14:38:24 GMT
Not most promising as easiest or first, it's just that I think that when and if humanity feels that we collectively need fusion, fourtons will ultimately be what we settle for. Actually is hydrogen fusion really physically feasible to generate power? It 's just to hard to ignite hydrogen...
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Post by RiftandRend on Jun 3, 2017 22:38:50 GMT
Not most promising as easiest or first, it's just that I think that when and if humanity feels that we collectively need fusion, fourtons will ultimately be what we settle for. Fourtons? p+p+p+p>He Fusion? That's impossibly difficult to achieve. So much so that I have no idea what its Lawson criterion is, and it hasn't been seriously considered by any institute I know of. At that point, it's better to just use low orbiting solar power farms. Edit: It might be possible with antimatter injection, but there are better candidates for that.
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Post by The Astronomer on Jun 4, 2017 6:05:37 GMT
Can we generate power from neutrons, other than using them to breed tritium from lithium, and gamma rays?
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Post by RiftandRend on Jun 4, 2017 7:07:28 GMT
Can we generate power from neutrons, other than using them to breed tritium from lithium, and gamma rays? Possibly. Moderating materials can slow fast neutrons and turn their kinetic energy into heat, but I don't know how well they will handle the 14.1 MeV neutrons from D+T fusion or what kind of temperature can be expected.
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Post by The Astronomer on Jun 4, 2017 7:11:29 GMT
And also, how much antiproton/proton pairs do we need for each fourton reaction? I'm considering modding amat-catalyzed fourton fusion reaction.
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Post by RiftandRend on Jun 4, 2017 7:22:45 GMT
And also, how much antiproton/proton pairs do we need for each fourton reaction? I'm considering modding amat-catalyzed fourton fusion reaction. No idea, you would need to find the required temperatures and then calculate the number of pair annihilations required to reach it. It would be significantly easier to calculate for The already defined reactions.
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Post by Kerr on Jun 4, 2017 14:21:45 GMT
And also, how much antiproton/proton pairs do we need for each fourton reaction? I'm considering modding amat-catalyzed fourton fusion reaction. How much energy do we need to start a fourton fusion cycle in KeV/MeV?
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Post by Kerr on Jun 4, 2017 14:42:04 GMT
For D-T fusion engines: What about using reaction mass? 1g D-T releases 340GJ when fully fused, to utilize the neutrons we use 10g of a liquid moderator, if no major energy is lost in the process you get a exhaust velocity of 8Mm/s.
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Post by zorbeltuss on Jun 4, 2017 22:19:32 GMT
Not most promising as easiest or first, it's just that I think that when and if humanity feels that we collectively need fusion, fourtons will ultimately be what we settle for. Actually is hydrogen fusion really physically feasible to generate power? It 's just to hard to ignite hydrogen... Physically feasible? Technologically feasible you mean I'd guess? Not now, probably not within a hundred years, in the long run probably though. I'd give a similar timeline for fusion power in general, though I feel like it's slightly less probable that we get fusion power in the long run than that tech could exist making the fourton feasible.
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Post by RiftandRend on Jun 4, 2017 23:15:38 GMT
Actually is hydrogen fusion really physically feasible to generate power? It 's just to hard to ignite hydrogen... Physically feasible? Technologically feasible you mean I'd guess? Not now, probably not within a hundred years, in the long run probably though. I'd give a similar timeline for fusion power in general, though I feel like it's slightly less probable that we get fusion power in the long run than that tech could exist making the fourton feasible. Question, what good qualities does fourton fusion even have? It's lawson criterion is probably in the tens of thousands and would be very difficult with even far future tech.
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Post by Kerr on Jun 5, 2017 9:15:39 GMT
Physically feasible? Technologically feasible you mean I'd guess? Not now, probably not within a hundred years, in the long run probably though. I'd give a similar timeline for fusion power in general, though I feel like it's slightly less probable that we get fusion power in the long run than that tech could exist making the fourton feasible. Question, what good qualities does fourton fusion even have? It's lawson criterion is probably in the tens of thousands and would be very difficult with even far future tech. It has 1,9x times the energy density of D-T/D-He³, and 1,3x times the Exhaust velocity of them. Besides that it only needs Protonium for fusion which is waaay easier to acquire than He³, H³, heck even H².
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