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

## TL;DR

This paper proposes a method using multiple RF cavities to cancel arrival time jitter in ultrafast electron diffraction, significantly enhancing temporal resolution below 100 femtoseconds.

## Contribution

It introduces a theoretical approach to eliminate RF-induced jitter in electron pulses by combining multiple RF cavities with optimized parameters.

## Key findings

- Jitter cancellation at the compression point is achievable with proper cavity configuration.
- RF amplitude jitter has negligible impact at optimal RF phase.
- Temporal resolution can be improved to below 100 fs.

## Abstract

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