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arxiv 2311.16400 v2 pith:FTARHPRW submitted 2023-11-28 physics.acc-ph cond-mat.otherphysics.ins-det

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

classification physics.acc-ph cond-mat.otherphysics.ins-det
keywords electrondiffractionultrafastcavitycontinuousfeedbackresolutiontemporal
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The temporal resolution of ultrafast electron diffraction (UED) at weakly relativistic beam energies ($\lesssim$ 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$\pm$19 fs RMS temporal resolution in pump-probe studies.

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