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The temporal resolution of ultrafast electron diffraction (UED) at nonrelativistic beam energies ($\lesssim$ 100 keV) suffers from space chargeinduced electron pulse broadening. We describe the implementation of aradiofrequency (RF) cavity operating in the continuous wave regime to compresshigh repetition rate electron bunches from a 40.4 kV DC photoinjector forultrafast electron diffraction applications. A feedback loop based on thedemodulated I and Q signals from an antenna located inside the cavity allowsfor the improvement of stability of both the phase and amplitude of the RFfields leading to $<$ 200 fs temporal resolution in pump-probe studies.

Vector-based feedback of continuous wave radiofrequency compression cavity for ultrafast electron diffraction