Patent Number: 
Section: claims

1. A compact neutron generator, comprising:an electron beam source;a power rod at which an electron beam from said electron beam source is directed, said power rod including at least one neutron multiplying material;a target isotope;at least one neutron spectrum shaper disposed between said neutron multiplying material and said target isotope; andat least one cooling channel disposed around said at least one spectrum shaper and through which a coolant is pumped. 2. The apparatus of claim 1, wherein said power rod includes high-Z material. 3. The apparatus of claim 1, wherein said high-Z material is liquid lead bismuth eutectic. 4. The apparatus of claim 3, wherein said LBE is spiked with neutron multiplying material. 5. The apparatus of claim 1, including one neutron spectrum shaper, wherein said neutron spectrum shaper contains LBE. 6. The apparatus of claim 1, including first and second neutron multiplying materials, and first and second neutron spectrum shapers. 7. The apparatus of claim 6, wherein said generator is substantially cylindrical, and wherein said first neutron multiplying material is disposed in the general center of the cylinder, said first neutron spectrum shaper is axially disposed around said first neutron multiplying material, said target isotope is axially disposed around said first neutron spectrum shaper, said second neutron spectrum shaper is axially disposed around said target isotope, and said second neutron multiplying material is axially disposed around said second neutron spectrum shaper. 8. The apparatus of claim 7, further including a reflector axially disposed around said second neutron multiplying material so as to reflect second generation neutrons. 9. The apparatus of claim 7, further including one or more cooling channels disposed between one or more of said first and second neutron multiplying materials, said first and second neutron spectrum shapers, and said target isotope. 10. The apparatus of claim 7, further including a reflector axially disposed around said first and second neutron multiplying materials converters. 11. The neutron generator of claim 10, wherein said reflector is fabricated from a beryllium alloy. 12. The neutron generator of claim 11, wherein said beryllium alloy is beryllium deuteride. 13. The apparatus of claim 1, wherein said at least one neutron spectrum shaper includes a gamma emitting alloy that includes spectrum shaping additives for slowing high energy neutrons to energies in the epithermal or thermal neutron spectrum. 14. The apparatus of claim 13, wherein said neutron spectrum shaper includes a metal matrix fabricated from metal hydride material.