  A next-generation, high-flux DD neutron generator has been designed,
commissioned, and characterized, and is now operational in a new facility at
the University of California Berkeley. The generator, originally designed for
40Ar/39Ar dating of geological materials, has since served numerous additional
applications, including medical isotope production studies, with others planned
for the near future. In this work, we present an overview of the High Flux
Neutron Generator (HFNG) which includes a variety of simulations, analytical
models, and experimental validation of results. Extensive analysis was
performed in order to characterize the neutron yield, flux, and energy
distribution at specific locations where samples may be loaded for irradiation.
A notable design feature of the HFNG is the possibility for sample irradiation
internal to the cathode, just 8 mm away from the neutron production site, thus
maximizing the neutron flux (n/cm2/s). The generator's maximum neutron flux at
this irradiation position is 2.58e7 n/cm2/s +/- 5% (approximately 3e8 n/s total
yield) as measured via activation of small natural indium foils. However,
future development is aimed at achieving an order of magnitude increase in
flux. Additionally, the deuterium ion beam optics were optimized by simulations
for various extraction configurations in order to achieve a uniform neutron
flux distribution and an acceptable heat load. Finally, experiments were
performed in order to benchmark the modeling and characterization of the HFNG.

Accelerator Physics