I miss used the term "bipolar"in my previous post (again
). The comments about ion and electron flows may be better described in this old paper...
http://www.askmar.com/Fusion_files/EMC2 ... 20Flow.pdf
As for comments about magnets, superconducting or otherwise.It is a topic with it's own subtleties. There has been some discussion about magnet cooling/ shielding here. perhaps M. Simon has had the most authority.
From outside in there would be one or two water shells to absorb and carry away the heat from sources inside the magrid- fusion, bremmstruhlung, etc. A vacuum shell for insulation, then a shell containing the superconductor (or copper wire) and coolant (liquid helium of liquid nitrogen).M. Simon estimated that ~ 40% of the magrid can may be occupied by the magnetic field generating wire. The Demo Pollywell, sometimes called WB100, that was proposed by Bussard was a ~ 3 meter diameter magrid .with ~ 10 Tesla magnetic fields provided by cooled copper windings. Bussard left the issue of improved conductors for the magnets to subsequent engineering development. This is similar to the Jet Tokamak. It used copper coil magnets, though any consideration for a production Tokamak assumes super conductors.
Use of the term destructing the electrons is misleading. In these machines the electrons speed and direction is manipulated, but there is no destruction of electrons. The only place in nuclear fusion that his may apply is reverse beta decay, which is not a component of the physics within a Polywell, or a Tokamak for that matter. The electrons may be lost from containment but they are not destroyed. This electron containment loss is what determines if the energy balance can be made positive with D-D fusion. With P-B11 fusion other issues like Bremsstruhlung complicates the issue.
To error is human... and I'm very human.