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Cuicui
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by Cuicui » 26/01/07, 09:37

Chuwee wrote:The, I give up : Lol:

In reading the article, I just thought of something.
He talks about recreating all the mendeleiv table elements if one has a sufficiently high temperature with a clean fusion without neutron flux, which is theoretically feasible although for the "clean", I'm less sure ...
He also talks about his mythical boron-hydrogen, lithium-hydrogen (: lol:) fusions which, as I already explained to you, will never give helium.

Hi Chuwee,
Originally, did this story of helium production come only from JPP? It is true that the questions I asked on this subject have so far remained unanswered.
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by Chuwee » 26/01/07, 16:52

There is indeed a fusion which is produced starting from lithium and hydrogen and which gives helium. It is the one used in H bombs where an A bomb produces a neutron flux, lithium, is transformed into Hydrogen, deuterium and tritium then fusion to give helium ...

If you are interested, I can try to make a kind post:
"Atomistics, radioactivity, radiation-matter interactions for dummies ..."
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by Cuicui » 26/01/07, 17:56

Chuwee wrote:There is indeed a fusion which is produced starting from lithium and hydrogen and which gives helium. It is the one used in H bombs where an A bomb produces a neutron flux, lithium, transforms into Hydrogen, deuterium and tritium then fusion to give helium ... If you are interested, I can try to do a gender post:
"Atomistics, radioactivity, radiation-matter interactions for dummies ..."

Thanks, Chuwee, for the info.
If lithium turns into deuterium and tritium which merge into helium, I suppose that this fusion gives off neutrons, and that it is therefore not a "clean" reaction. Why does JPP talk about quasi-aneutronic fusion during lithium-hydrogen and boron-hydrogen fusion?
As for the post for dummies, that's exactly what I need, I'm interested.
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by Chuwee » 26/01/07, 18:22

A D + T fusion produces 1 neutron (against 2.5 for a 235U fission) therefore less activation than in our current power plants (although the number of fusions necessary to provide the same energy as a 235U fission is greater).

The activation problem can be "circumvented" by using materials which, when activated, have short periods (<30 years). We can also use hydrogen to attenuate this neutron flux (hydrogen has the largest cross section for neutrons so more interactions with them) ...

The main advantage of fusion is that it does not produce "big" radioactive nuclei with enormous half-lives but small ones with a very short half-life so very few waste storage problems (because in my opinion there will always be garbage).

As for JPP, I don't know what's going on in his head ... : Lol:
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by Cuicui » 26/01/07, 19:55

I found that :
http://www.z-fusion.net/spip/spip.php?article62
".... In 2005, a Russian team achieved a first aneutronic hydrogen-boron fusion using a picosecond laser [10]. The number of induced fusion reactions (of the order of 103 α particles emitted for each laser pulse ), however, is still extremely low. "
"Although the z-pinch devices were not mentioned as possible hydrogen-boron reactors, the appropriate ion energies for such reactions, up to 300 keV, have been announced by researchers on the Laboratories Z-machine. Sandia. "
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by zac » 26/01/07, 20:38

Chuwee wrote:If you are interested, I can try to make a kind post:
"Atomistics, radioactivity, radiation-matter interactions for dummies ..."


Hello

Great it would allow us to go to bed - stupid and not very understanding of how a pantone works. : Lol:

@+
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by Chuwee » 27/01/07, 01:13

To come back to the BH fusion, there is something I do not understand ...

We will take the opportunity to do the 1st lesson : Lol:

We will call Q the heat of reaction.
If Q is negative, energy must be supplied, endothermic reaction.
If Q is positive, it releases energy, exothermic reaction.

Take a reaction of type X (x, y) Y
X and Y are nuclei,
x and y are nuclei, particles, radiation, whatever you want ...

X + x -> Y + y

Q = mX + mx - mY -my
mX is the mass of X, mx is the mass of x, etc.

In the case that interests us, namely BH, we have

B + H -> 3He
mB = 11.009 u (11 B)
mH = 1.007u (825H)
mHe = 4.002u (603He)

Q = 9.321E-3 u or 8.6825 MeV (1u = 931.5 MeV)


Now we are talking about merger:
B + H -> C (12C)

mC = 12u

Q = 0.01713 u or 15.957 Mev


To go from C to 3He:

Q = -7.275 MeV

It is a fairly energetic fusion reaction but which should yield 54% of its energy at best to produce 3He and therefore be clean.
So we have 8.68 Mev of energy left, which is almost nothing related to the number of nucleons present (but that's already good).

Just for comparison, a 235U fission produces an average of 200MeV.

All that to say that I don't understand how they go from 12C to 3He : Lol: ... Fission, desexitation with emission of 2 alpha ... If you have ideas ...

If not, did you like your first lesson? : Lol:
It was pretty soft, right?
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by Woodcutter » 27/01/07, 02:10

Cuicui wrote:[...] You, as a person, what do you think of the prospects that suggest the technique of magnetic necking (compression)?
Uh ... magnetic? This is what is used in tokamaks?
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by Woodcutter » 27/01/07, 02:12

Cuicui wrote:[...] As for the post for the dummies, it is completely what I need, I am taker.

I more!
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by Cuicui » 27/01/07, 10:24

Woodcutter wrote:
Cuicui wrote:[...] You, as a person, what do you think of the prospects that suggest the technique of magnetic necking (compression)?
Uh ... magnetic? This is what is used in tokamaks?

In a tokamak, magnetic energy is used to contain a plasma continuously in an annular duct (torus). It's the magnetic confinement. The French JET is the largest tokamak in the world. TORE SUPRA is smaller, but it is equipped with superconductive magnets, more efficient, but fragile. With the future ITER, a giant tokamak also equipped with superconducting magnets, we hope one day to be able to confine a hot plasma long enough to maintain a deuterium-tritium fusion continuously. But that poses problems difficult to solve, and in addition, the reaction, not being aneutronic, produces radioactive waste (fortunately much less than uranium fission plants).
In a much more rustic z-pinch device, magnetism is used to violently compress (neck) a plasma for a very short time. It's here magnetic necking, which could be used to induce fusion reactions discontinuously (small explosions in series). The very high temperatures obtained by the Sandia z-machine make it possible to envisage quasi-aneutronic hydrogen-boron fusion, which practically releases only charged particles which can be captured directly to produce electricity, without moving parts, which reduces still the costs.
This is why we could say that there is a difference between the tokamak and the z-pinch a little similar to that between the steam engine and the internal combustion engine.
Okay, stop drunk you, all this has already been abundantly described, especially by JPP. Whatever opinion we have of him, I find his articles interesting and documented, that's why I indicated the references in my previous posts.
Last edited by Cuicui the 28 / 01 / 07, 01: 07, 3 edited once.
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