Joseph Chikva wrote:

If I understand correctly, the deuterium and tritium (or other fuel) is moving at such high velocity that there is no possibility for motion in any other direction, ie: the self-organizing motion of an instability.

Radial motion mainly will be created thanks to scattering of faster moving ions on slower ions. (As the first approximation we can neglect the scattering of electrons on ions)
As it has been mentioned above the self-magnetic field of combined three beams will return then scattered particle to the axis.
But via collective interaction the radial temperature of whole system will rise.
Also we will have two other effects:
• radiation of electrons dissipating that radial motion energy
• alignment of arrange velocities of ions’ beams
And in fact we will have something like friction between all three beams. Thank this the equilibrium would occure.

For compensation of alignment of arrange velocities it is offered to use the longitudinal electric field. So, if in faster moving ion beam we will use the particles having higher rate of acceleration, we easily can select the proper intensity of electric field.
Examples:
• deuterium and tritium with faster deuterium beam
• deuterium and helium-3 with faster helium-3 beam
• proton and boron-11 with faster proton beam

Spiralfield wrote: How do you intend to impart such energy, what difficulty do you see with maintaining the focus of your beams, and have you been able to estimate a breakeven number?

I can not estimate a breakeven number (criteria) yet. Because some theoretical investigations (researches) should be done before. First of all for fixing the stability area and then for fixing the breakeven criteria. And this isn’t a trivial task.
Regarding difficulties with maintaining the focus of beams, all those are solvable technical challenges.