Electron's magnetic moment in plasma/fusion physics?

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jarek
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Electron's magnetic moment in plasma/fusion physics?

Postby jarek » Thu May 26, 2011 5:44 am

We usually look at electron as just a charged point, while it has also strong magnetic moment. Papers from good journals of Polish physicist (Gryzinski) who worked on plasma for half a century strongly suggest that this magnetic moment is also extremely important - I'm trying to find some information about it, but it looks completely forgotten. Maybe I could find some on this forum?

Magnetic moment means that electron is also a tiny magnet, so imagine there is e.g. proton in this magnetic field: if we change coordinates such that electron stops for a moment, now proton is moving in magnetic field and because of 3rd Newton's law, created Lorentz force also affects electron.
So there is some kind of - not only moving charge is affected by magnetic field, but also moving magnetic dipole by electric field.
It for example allowed him to calculate classical electron-proton scattering approximations having very good agreement with experiment (1959) - these papers have hundreds of citings and I haven't found any nonpositive.

I think its most important consequence for fusion physics would be that for some parameters, electron falling into nucleus can scatter in exactly opposite direction - so it can literally bounce between two nuclei, screening their Coulomb repulsion, especially if one nucleus is proton/D/T.
It means that electron could really help crossing the Coulomb barrier for fusion and it should finally obtain some part of released energy (beta radiation) - Gryzinski quickly became enthusiast of electron assisted fusion, Nature published his explanatory note a month after P&F cold fusion announcement.

Here are gathered some of his papers: http://en.wikipedia.org/wiki/Free-fall_atomic_model

Is electron's magnetic moment important/considered in recent plasma, fusion physics?
Can electrons help crossing Coulomb barrier for fusion?

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Re: Electron's magnetic moment in plasma/fusion physics?

Postby Giorgio » Thu May 26, 2011 8:04 am


rcain
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Re: Electron's magnetic moment in plasma/fusion physics?

Postby rcain » Thu May 26, 2011 8:16 am


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Postby jarek » Thu May 26, 2011 8:35 am

Giorgio, I don't think it applies only to cold fusion case - about supernovas - from his book (which unfortunately is in polish).
On 162-163 page of this book he indeed defend cold fusion, using arguments like:
- energy balance in our planet - they couldn't identify source for more than 50% of energy,
- they couldn't identify source of strange isotope composition of volcano gases - with high concentration of tritium (12 years half-life) and He3,
- in some kind of rocks there are observed localized regions with high helium concentration (also He3).
But he also write about fusion in star cores - blue text on says that energy in our star is released through sythesis of two protons with assist of electron and then small blue text on the bottom says that Eganowa analysis says that surprisingly the amount of energy generated by star decreases with increase of temperature of the core, what is consistent with his theory of electron assisted fusion (he calls it 'molecular mechanism of nuclear synthesis') (?)

rcain, thanks and welcome.
I know that polywell uses electrons for different purpose - mainly as energy carriers, but maybe their assist itself is also essential for this fusion process?

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Postby rcain » Thu May 26, 2011 9:05 am


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Postby jarek » Thu May 26, 2011 9:26 am

I don't know much about plasma physics, but it seems that hot plasma group he worked in for almost 50 years (and was its chief for almost 20 - table on 7th page of ) indeed worked on some kind of Focus Fusion approach - e.g. he writes that in 1959 they started to work on 'rod cannon' which was prototype of ion diode (15 years before USA) - are pictures of collisions of such two plasma beams. I cannot find it now, but I think he has written that each country of Easter bloc had to have a tokamak project, but he protested that it won't work and so Polish plasma group worked on such colliding plasma beams instead, but finally while government has changed, they've lost funding and project was closed in early 90s.

About other explanations of hypothetical cold fusion, the only taken seriously I've seen seems to be so called Widom-Larsen Theory, in which protons and electrons combine into neutron to screen coulomb barrier – sounds great, but required energy for such process is 0.78MeV – it’s quite huge, thermodynamically it's completely improbable ... we could borrow it from vacuum due to Heisenberg principle, but only for about 4*10^-22s. Protons in room temperature have about 1000m/s velocity, so in this way we could only explain last attometers …

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Postby Giorgio » Thu May 26, 2011 11:18 am


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Postby Giorgio » Thu May 26, 2011 11:21 am


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Postby jarek » Thu May 26, 2011 11:45 am

I briefly looked through that discussion, but I have to admit that as I've written - I rather don't treat such explanation seriously.
About the hypothetical need of enriched nickel, there are some arguments to think about it, like:
- higher isotopes have larger radius and so the proton doesn't have to get as close,
- higher isotopes have larger neutron concentration, probably also on surface - proton should approach from such neutral directions,
- different isotopes have different magnetic moments, what could be important e.g. because of attraction of anti-parallel alignment (?).
But I don't think these reasons could be really essential - I would say that the only reason to use enriched nickel (giving about 3.5 less energy!) is safety - that if e.g. car crashes, escaped liquid wouldn't be radioactive.
In is claimed that not only it can use different isotopes, but also dozens of different elements.

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Postby rjaypeters » Thu May 26, 2011 12:28 pm

"Aqaba! By Land!" T. E. Lawrence

R. Peters

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Postby jarek » Thu May 26, 2011 12:46 pm

This article doesn't even mention what it is really about () - finding a better limit for electron's electric dipole moment - I agree that most probably it should be zero.
But we also know that electron has spin and corresponding magnetic dipole moment - directed properties, which wouldn't allow me to tell that it's perfectly spherical.
Positive about it is admitting that it isn't just a point-wise entity, but rather a nonzero volume field configuration, but it's discussion for a ...

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Postby D Tibbets » Thu May 26, 2011 7:51 pm

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

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Postby jarek » Fri May 27, 2011 6:26 pm


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Postby chrismb » Fri May 27, 2011 7:03 pm


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Re: Electron's magnetic moment in plasma/fusion physics?

Postby jarek » Tue Jan 10, 2017 3:25 pm

Here is a simple simulator for single-electron trajectories in proton's potetnial with included Lorentz force from electron's magnetic dipole moment:
http://demonstrations.wolfram.com/Keple ... teraction/
Equation is in Details section.
We get analogous correction in gravitomagnetism (approximation of GR tested in Gravity Probe B: en.wikipedia.org/wiki/Gravitoelectromagnetism ) for trajectories around a pulsar or spinning black hole.
Some example trajectories:
Image

Maybe this Lorentz force could be important in polywell?


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