Year
2024
Abstract
| We will present the demonstration of a new implementation of a passive fast neutron imaging measurement system known as CONFIDANTE (CONfirmation using a Fast-neutron Imaging Detector with Anti-image Null-positive Time Encoding). Our demonstration uses this 2D time-encoded fast neutron imaging system with an anti-symmetric spherical mask pattern to perform zero knowledge measurements that protect sensitive geometrical information. This is achieved with simple hardware that alarms on whether the fast neutron count value at each mask orientation is outside maximum and minimum thresholds: currently only an analog pulse-shape discrimination unit and two threshold crossings are necessary, exclusive of an (assumed) host-controlled motion controller. The ultimate result of this work is to enable the inclusion of warhead confirmation measurements based on geometrical comparisons of fast neutron emissions in the next generation of nuclear arms control treaties. We will present our validation of both positive and negative confirmation measurements with equipment that has a viable path towards passing certification as well as authenticating procedures to increase inspector confidence. We will detail simulated predictions of alarm rates along with experimental measurements over twenty trials that show alarm rates for positive and negative confirmation measurements that are consistent with model predictions. |