High Energy Neutron Production for Nuclear Data Needs*

High energy neutron-induced reaction data is in increasing demand for the design of shielding for space exploration and materials damage for fusion energy systems. We have developed a Chi-Squared analysis tool that facilitates comparisons between experimental and evaluated cross section data sets. This method displays shortcomings due to a lack of data that creates inaccuracies in all predictive simulations, driving the need for new measurements.

However, many neutron sources do not have the correct characteristics to perform the experiments needed to address these data needs. Ion-source based “DT” and “DD” neutron generators produce quasi-monoenergetic energy neutrons with low intensity, and multi-100 MeV spallation sources yield high intensity, but over a very wide range of energies. 

This project focuses on the design and testing of a multi-layer beryllium breakup target. Using existing models of thick target beryllium breakup and SRIM modeling in beryllium and water, the target was designed to produce 10-20 MeV neutrons when bombarded with a 40 MeV deuteron beam. A separate test of the critical heat flux (CHF) for beryllium-water interface is required before running. A single channel steel target bombarded with alphas to mimic the conditions of the multi-layer target will be used to test the CHF.

Note: Will be Co-Presented with Elan Park-Bernstein