Advances in detection for neutron reflectometry with time-resolved imaging detectors

Area of Science:

• Neutron scattering science
• Materials science
• Detector physics

Background:

• Conventional thermal neutron detectors face limitations in sensitivity and performance.
• Combining spatial and temporal resolution offers a path to advanced neutron detection.
• Existing technologies struggle with high-intensity neutron beams.

Purpose of the Study:

• To demonstrate a new data-driven imaging sensor for enhanced thermal neutron detection.
• To evaluate the performance of this sensor in neutron reflectometry experiments.
• To assess its suitability for future neutron scattering facilities.

Main Methods:

• Utilizing a neutron-sensitive scintillator coupled with a Timepix3 ASIC-based camera.
• Comparing the new imaging sensor with conventional Helium-3 detectors.
• Measuring various samples using the ASTERIX instrument at Los Alamos Neutron Scattering Center.

Main Results:

• Achieved at least a two-order-of-magnitude increase in detection rate.
• Demonstrated the potential for unprecedented performance in neutron reflectometry.
• Showcased a new method for tuning detector efficiency using light collecting optics.

Conclusions:

• The developed imaging sensor meets performance parameters for future reflectometers like QIKR.
• The technology enables streamlined experiments and measurements with intense neutron beams.
• Further detector improvements are ongoing for expedited scientific discovery.