FP Generation

[rcain]

...
I would like to say you more: for any frame of reference magnetic force of parallelly moving particles never exceed electrostatic repulsion but will become equal only in case if v=c.
• Now let's consider ions from electron frame of reference.
• Then electrons from ion frame of reference.

... should we not also consider ion & electron combinations in lab-frame of reference? it seems rather important to me.

[Joseph Chikva]

Ok, you make progress.

I never said any different.

You said. But let's forget.
On the rest I will answer in the evening (for my frame of reference )
Because I should go now.

[Joseph Chikva]

...
I would like to say you more: for any frame of reference magnetic force of parallelly moving particles never exceed electrostatic repulsion but will become equal only in case if v=c.
• Now let's consider ions from electron frame of reference.
• Then electrons from ion frame of reference.

... should we not also consider ion & electron combinations in lab-frame of reference? it seems rather important to me.

You can consider in any frames.
If you would not make mistakes you will get the same results.
But it (ions in electron's frame and electron's in ion's frame) you can do only for simplicity.

[rcain]

... i think we are still discussing http://www.fpgeneration.com/marble/index.html ... somehow, but i'm not sure some other stuff isn't getting mixed up in this thread.

(btw: the fp design uses multiple accel-decel electron (&ion?) focusing zones. which seems to be of some relevance.).

[Joseph Chikva]

I've never disputed an additional current can cause a pinch. Quite the opposite. This whole discussion was about your claims that like charges in a beam self-pinch. You seem to me now accepting that the cannot.

No any additional current.
In electron beam the magnetic attraction reduces the space charge repulsive forces as 1/γ2.
So, if Lorenz factor of electron equal to 10 - 100 fold. =>
If you even insert some ions (not moving ions but only cloud) into the beam, for achievement of equilibrium between attraction and repulsive forces you need ion's number density 100-times less then electrons' number density. Insertion of a little bit more of ions and attraction will exceed repulse - so pinch possible.
And I see again your total misunderstanding of the discussed issue.

PS: Here for simplicity of explanation I have considered electron beam and ions cloud. In case of unidirectional currents pinch will occur easier.

But in your 'invention', the current would have to be so high that I expect you would be pumping >>terawatts into an electron beam to achieve what you say you want to do. It is for you to show the calculation of feasibility, not for me to numerically demonstrate my expectations.

Every fusion device needs to be pumped with some energy (power) and then should give us fusion energy gain factor Q>1.
For each fusion event we need to spend hundreds of keV and get MeVs.
No terawatts. But very significant energy should be put into the currents like other experiments. Like to other projects.
If we will build 1000 MW power plant and Q=10 we need 100 MW power pumped: in all three beams together with power needed for loading an accelerating field.
I only see the possibility to reach breakeven easily with my invention or "invention" (how you wish to write )

[Joseph Chikva]

My physics background taps out at the undergrad level, ...
... I do KNOW that chrismb understands basic physics ...

Are you sure till now?

[Joseph Chikva]

And Chris wrong declaring that coherently moving particles do not feel magnetic forces.

Stop with your 'such and such is wrong' claims, and demonstrate statements are wrong, with argument and numbers, if you want to show it.

It is self-evident that coherent charges have no pinching magnetic effect on each other. Charge distributes itself evenly across an isolated metal plate!

http://resources.metapress.com/pdf-prev ... ze=largest

Strong magnetic self-focusing causes characteristic electromagnetic radiation which tends to damp out transverse electron oscillations. If certain other conditions are also satisfied, this effect causes the beam to contract into a thin thread-like structure with enormous electric and magnetic field at the surface and which is apparently a stable and long-lived configuration.

Self-evident