2016 CAP Congress / Congrès de l'ACP 2016

RF-Compressed Ultrafast Electron Diffraction: Long-Term Sub-50 fs Phase Stabilization in High-Brightness Instruments

14 Jun 2016, 19:06

2m

SITE Atrium (University of Ottawa)

Poster (Student, Not in Competition) / Affiche (Étudiant(e), pas dans la compétition) Instrumentation and Measurement Physics / Physique des instruments et mesures (DIMP-DPIM) DIMP Poster Session with beer / Session d'affiches, avec bière DPIM

Speaker

Martin Otto (McGill University)

Description

Ultrafast electron diffraction is a powerful table-top technique to characterize structural dynamics in condensed matter. We present an analysis of the phase stability of a 3 GHz radio-frequency electron pulse compression cavity. We implement low-noise microwave phase detection electronics to measure the slow drift (greater than 1 s) of the cavity resonance, allowing for continuous feedback and stabilization during an experiment. By optimally tuning the parameters of the feedback system, the additive drift of the cavity phase is reduced from ~ 1 ps to ~ 50 fs, yielding a significant improvement in the time resolution of the instrument.