Commercially they're used as neutron generators for when you need longer lifetimes than ion-beam neutron generators: http://www.nsd-fusion.com/ http://www.nsd-f

Commercially they're used as neutron generators for when you need longer lifetimes than ion-beam neutron generators: http://www.nsd-fusion.com/ http://www.nsd-fusion.com/ A modified version (accelerating electrons instead of fuel ions, using magnetically shielded and actively cooled superconducting accelerator grids) shows some promise for actual power production: http://en.wikipedia.org/wiki/Polywell http://en.wikipedia.org/wiki/Polywell