Monte-Carlo Simulations of Prismatic Analyzers for Neutron Scattering Spectrometers
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Desai, Adit Sameer
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Condensed matter physics was revolutionized by the invention of the neutron triple-axis spectrometer, which is one of the best scientific instruments to probe magnetic pair correlations in materials. However, triple-axis spectrometers are inefficient in surveying large volumes of momentum-energy space (Q, ω). This often results in measurement times of several days or weeks, even at state-of-the-art neutron sources. To enable faster measurements of the dynamical spin structure factor S(Q, ω), there have been significant efforts to improve instrument efficiency. One of the latest advances relies on multiplexing prismatic analyzers. This approach was successfully implemented on the Continuous Angle Multiple Energy Analysis (CAMEA) spectrometer at the Swiss Neutron Source. In this thesis, I report Monte-Carlo neutron ray-tracing simulations conducted to investigate multiplexing prismatic analyzers for implementation on the Multi-Analyzer Neutron Triple Axis (MANTA) for consideration at Oak Ridge National Laboratory’s High Flux Isotope Reactor. This investigation discovered a novel analysis technique dubbed Positionally-Calibrated Prismatic Analysis, which increases the resolving power of the spectrometer by a factor of 6 on realistic sample scattering models. Possible designs for MANTA were optimized considering this data analysis technique. By doing so, I hope to help make MANTA a world-class probe of quantum condensed matter systems.
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Undergraduate Research Option Thesis