Maybe just one layer is too leaky. They already have supports that can contain the power cables.jrvz wrote: Very interesting. I'm not sure I understand the two concentric layers of coils. Do they plan to use the outer coils to induce currents in the inner coils (mirror currents)?
Indeed, not the IEC approach.jrvz wrote:They don't mention putting the coils at some electric potential (i.e. implementing a magrid).
This confinement configuration involves electron cyclotron resonance heating with the use of a pair of very high frequency (~200 GHz) gyrotrons along with a very strong magnetic field (~7.2 T)...
But one might also argue that because Polywell's field near the nubs is so high, there are effectively no line cusps, just 14 point cusps.jrvz wrote:I think this coaxial coil geometry does offer one advantage over the polywell. Both have line cusps. For the polywell, the peak field varies along the cusp, so I expect the leakage to be largest where the cusp is furthest from the coils. If the field is just strong enough there, then it's stronger than necessary everywhere else. For the coaxial geometry, the peak field is the same all along a given cusp. Looks more efficient.
While in no way proof, the picture on EMC2's web site hints at point cusps at the cube corners, not line cusps between coils. Note the faint jets in the corners on the right side of this picture and the "sparklies" at what looks like the base of the jets on the left side (just inside the top and bottom of the face-on coil):