POLY-TOK?

[KitemanSA]

Has anyone investigated a hybrid polywell/tokamak machine?
Picture a tokamak with a toroidal poly-grid inside such that the reaction volume is toroidal but the magnetic fields press inwards more strongly as the reaction volume gets denser and presses outward more strongly. (IIRC., that means the poly-grid would provide a convex field?) The inner poly-grid would be comprised of simple rectangular coils (as close ot square as needful) arranged in a toroid, with larger units (with more windings) on the outer major radius, smaller rectangles, fewer windings on the inner, properly graded around the minor diameter. Imagine a medium resolution finite element model of a toroid.

At certain points around the circumference of the grid, quads of coils would be intensionally misaligned to allow injection ports thru the funny cusps.

Thoughts?

[ladajo]

I have been pondering the efficacy of going down from a six-sided to a four sided. Or, maybe a three sided.
The primary loss mechanism is the point cusps, thus a reduction in their count seems logical.
If you have a six sided machine, that is eight point corner cusps, and six ring center point cusps, making for a total of 14 point cusps.
A four sided machine presents four corner cusps, and four ring centers, for a total of eight point cusps.
This could drop point cusp losses by almost half...
As the research move from arguing, essentially, in magnitude reductions, a half reduction could be become significant.

[KitemanSA]

I have been pondering the efficacy of going down from a six-sided to a four sided. Or, maybe a three sided.
The primary loss mechanism is the point cusps, thus a reduction in their count seems logical.
If you have a six sided machine, that is eight point corner cusps, and six ring center point cusps, making for a total of 14 point cusps.
A four sided machine presents four corner cusps, and four ring centers, for a total of eight point cusps.
This could drop point cusp losses by almost half...
As the research move from arguing, essentially, in magnitude reductions, a half reduction could be become significant.

I was under the impression that the primary loss mechanism was the LINE cusp that, in a Polywell, should NOT exist. Properly built with square and triangular magnets, the point and bare funny cusps SHOULD recirculate cleanly.