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The temporal resolution of sub-relativistic ultrafast electron diffraction(UED) is generally limited by radio frequency (RF) phase and amplitude jitterof the RF lenses that are used to compress the electron pulses. Wetheoretically show how to circumvent this limitation by using a combination ofseveral RF compression cavities. We show that if powered by the same RF sourceand with a proper choice of RF field strengths, RF phases and distances betweenthe cavities, the combined arrival time jitter due to RF phase jitter of thecavities is cancelled at the compression point. We also show that the effect ofRF amplitude jitter on the temporal resolution is negligible when passingthrough the cavity at a RF phase optimal for (de)compression. This will allowimprovement of the temporal resolution in UED experiments to well below 100 fs.

structural dynamics

Improving temporal resolution of ultrafast electron diffraction by  eliminating arrival time jitter induced by radiofrequency bunch compression  cavities