One way of generating neutrons is by fusing D-D or D with T. In neutron generators that work by acceleration D-ions into a solid matrix of e.g. metal and T or D (metal hydrides). Such generators can produce up to 10^8 neutrons per second. I'm wondering, could they be tweaked to even higher levels to eventually produce a net amount of energy? The best result for the polywell was for example 10^9 fusions/sec, not far off from 10^8 fusions/sec.
Neutron generators use a solid target, metal lattice filled with D2 or tritium, metal hydrides. The fusion reactions
D + T → n + 4He En = 14.1 MeV
D + D → n + 3He En = 2.5 MeV
happen within the lattice, most of the neutrons escape since they do not interact electromagnetically and generate the neutron source. There is no way a self sustaining reaction could exist within the lattice using the above energies so that the balance of (output energy -input energy ) could become positive and thus be an energy source.Interestingly there exist simpler neutron generators, patented and sold .In their own words:
The best neutron generators in the world (~3E+11 neutrons/second for 24 hours continously) are from Phoenix Nuclear Labs in Madison, Wisconsin. They are not doing solid targets, but gas based targets. Their machine is based on a fusor. But the design is very different. Electric fields do work on the ions - heating them to fusion conditions. That is the physical mechanism. In a fusors' case:
(1) Two wire cages with an electric field between them. (2) The ion accelerates. (3) It misses the inner cage. (4) It hits. It fuses. Naturally most of the ions hit the cage. This drives up conduction losses. This is a term in the Lawson Criterion for fusion power:
Power = Efficiency X (Fusion - Conduction - Radiation)
Because of the high conduction loss, fusors have been ignored for decades. Regardless, University of Wisconsin-Madison does the best fusor research in the world. Their HOMER machine has been well studied since the nineties. Dr. Gregory Piefer trained there before starting the company.
Phenoix llc. had a patent issued on 11/15/2012. This had sketches of their machine:
This is what it looks like assembled:
It is described as a gas target neutron generator. The company wants to use the high neutron fluency to make Molybdenum-99, a medical isotope.
Personally, I think the rest of the fusion world needs to wake up, to the exciting things happening in electrostatic confinement. We have our own textbook. We have very long list of unfunded amateurs who are doing nuclear fusion. We even hold the record for the youngest person in the world to do fusion: Jamie Edwards. Last week he was on the David Letterman Show discussing his fusor.
You can watch the Letterman clip here.
The Polywell Guy