The temporal resolution of ultrafast electron diffraction (UED) at weakly relativistic beam energies (≲ 100 keV) suffers from space-charge induced electron pulse broadening. We describe the implementation of a radio frequency (RF) cavity operating in the continuous wave regime to compress high repetition rate electron bunches from a 40.4 kV DC photoinjector for ultrafast electron diffraction applications. Active stabilization of the RF amplitude and phase through a feedback loop based on the demodulated in-phase and quadrature components of the RF signal is demonstrated. This scheme yields 144±19 fs RMS temporal resolution in pump-probe studies.
@article{arxiv.2311.16400,
title = {Vector-based feedback of continuous wave radiofrequency compression cavity for ultrafast electron diffraction},
author = {Thomas Sutter and Joshua Lee and Atharva Kulkarni and Pietro Musumeci and Anshul Kogar},
journal= {arXiv preprint arXiv:2311.16400},
year = {2024}
}