Research

Analysis of Inelastic Neutron Scattering Data

In neutron scattering experiments, phenomena such as multi-phonon scattering and multiple-scattering can subtly influence the measured spectra. End-to-end Monte-Carlo neutron ray-tracing simualtions using the MCViNE software can take into account much more details that matter to the measurements than traditional data analysis methods, take advantage of ever-increasing computing power, and help us gain better insight into how different scattering mechanisms give rise to different features in the neutron spectra.

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I(Q,E) spectra from a MCViNE simulation. See The Uranium Nitride study

The resolution in spectra of dynamical structure factor measured by inelastic neutron scattering has been difficult to quantify and it can lead to sub-optimal analysis. This is especially true for single-crystal measurements where the spectra is 4-dimensional. MCViNE simulations can accurately compute resolution functions, which vary for different instruments, different experimental conditions, as well as different locations in the 4-D Q,E space.

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I(h,E) slice of KVO HYSPEC data. Note the strong focusing effect in the two spin-wave branches stemming from (010).

The VNFatSNS project is attacking both problems by using the MCViNE software package.

Measuring ground deformation using optical satellite and aerial images

We are developing techniques for accurate satellite image correlation and registration, and DEM extraction by stereo imaging. See COSI-Corr

Our work contributed to a recent cover paper in the journal Science:

We are putting our technique into practical use at Imagin’Labs, which was in a startup report.