Fast-Response, Two-Dimensional Detector for Epithermal Neutron Detection with Adjustable Shape

60524 Existing neutron detector technology for neutron scattering instrumentation, used in materials research, is both expensive and limits the potential of U.S. researchers. To effectively utilize neutron scattering instrumentation, highly efficient, high-count rate detectors are needed that exhibit good resolution over very large areas. Furthermore, advanced neutron detectors will be critical components needed to fully make use of new intense neutron sources. This project will develop new neutron detector technology based upon a electron multiplication technique, which can be exploited for next-generation epithermal neutron detection. Ultimately, a large area, curved neutron detector, capable of microsecond pulse counting, parallax free, and with submillimeter position resolution will be developed. Phase I fabricated and demonstrated an neutron-to-electron multiplier using a proprietary glass. This was successfully coupled to fast pulse counting electronics to produce the first neutron images. Manufacturing techniques were demonstrated that would allow large areas to be produced with curvatures to remove parallax distortion. In Phase II, a large area neutron-to-electron multiplier, with enriched boron-10 composition for optimal gain in epithermal neutron detection, will be manufactured. The detector will be coupled to position sensitive, pulse counting electronics and a computer readout. The resulting prototype detector will be tested and characterized on a neutron beam used for neutron scattering instrumentation. Commercial Applications and Other Benefits as described by the awardee: State-of-the-art neutron detectors should find application in neutron scattering communities worldwide. The detector should be particularly useful at intense neutron source instruments, which are being developed at the Spallation Neutron Source for example, to enable researchers in all fields to increase productivity and expand research capabilities