Abstract
This article introduces a new method for fast stroboscopic SANS measurements. Phase locking the intensity of a time-modulated neutron beam to a modulated sample signal produces “snapshots” of the sample state within the modulation cycle. The phase sensitive scattering is preserved in the time averaged signal at the detector and scanning the phase between the modulations examines time-dependent sample behavior. This method enables measurements of sample dynamics with frequencies up to Megahertz provided the sample scattering can be modulated on this time scale. Since the chopper is installed in direct proximity of the sample and the scattered signal is independent of time, the installation of the required components for this technique is straightforward as an Add-on sample environment on SANS instruments with multiple detector banks.
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