Dave, The view is not invalid, but of limited use. My focus is not the magnetic vector potential per se, but that it all prior models may be irrelevant for modeling common applications like ICF.
In looking at the geometry of this device, or almost any plasma device - one
could logically expect Coulomb's law to interfere with spherical convergence
due to increase in opposite polarity in the central zone, but that is not
what happens in practice. In fact the opposite.
In a Tokomak, one should expect far better containment than what happens in
practice. Thus we have no working Tokomaks, despite 10 billion down the
drain. In an electron or ion beam, it was not appreciated for many years how
intensely same charge was attracted, instead of repelled.
If there is a broader message in why we have no hot fusion today, it
probably is that magnetism is nearly impossible to model in a plasma
containment device based on first principles. In all cases we have to work
backwards incrementally from known results, making alterations as we go.
Every model is a work in progress.
Did I mention solar flares?
From: David Roberson
Jones,
How would an observer moving along with the linear charges
be affected by its neighbors? Is there reason to consider this an invalid
view point?
-----Original Message-----
From: pagnucco
Jones,
I should have added that the magnetic vector potential is
not only small
for chaotic plasmas, but also for expanding or converging
spherical
charged plasma shells. It will only be large in intense,
linear flows.
-- LP
> Jones,
>
> You refer to something worth noting, but not the magnetic
vector
> potential.
>
> Ideally in a fusor, the particles converge to a point in
the center of
> the fusor, but the magnetic field momentum at the center
is quite small.
>
> Energy is borrowed from outer convergent spherical shells
of electrons or
> ions, but that is a scalar coulomb effect - not magnetic
vector potential.
>
> -- LP
>
>
> Jones Beene wrote:
>> BTW the Farnsworth Fusor benefits from "spherical
convergence" of ion
>> vectors.
>>
>> The vectors are self-focused and not chaotic.
>>
>> Farnsworth/ Hirsch found the fusion threshold is lowered
by a factor of
>> 4
>> due to spherical convergence, allowing substantial
neutron production at
>> far
>> lower voltage potential than colliding beams.
>>
>> Polywell borrowed the idea
>>
>>
http://www.askmar.com/Fusion_files/Polywell%20Ion%20Focus%20Concept.pdf
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
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