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

Thomas M SutterJoshua S H LeeAtharva V KulkarniPietro MusumeciAnshul Kogar
Published in: Structural dynamics (Melville, N.Y.) (2024)
The temporal resolution of ultrafast electron diffraction 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.
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