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Figure 6
Pockels cell jitter measurement via noise correlation. (a) The Pockels effect induces a strong noise-like, but reproducible, pattern in a long BNC cable observed with the oscilloscopes. The reference signal shown here is correlated in the time-domain to individual signals from the time delay runs. The scope was triggered using the primary EuXFEL trigger T0. (b) Corresponding delay histograms (grey bars) for certain nominal time delays (green lines) and average delays from cross-correlations (red lines). All measurements agree within the sampling interval of 0.8 ns. It can thus be concluded that the jitter between primary EuXFEL trigger T0 and the actual TPockels is σ ≃ 0.4 ns.

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