Single-shot third-harmonic spectral diagnostics for tender X-ray FEL pulses using a bent-crystal spectrometer

Arrell, C.; Lemke, H.; Prat, E.

doi:10.1107/S1600577526006739

Figure 3
Average autocorrelation of 2400 single-shot spectra and Gaussian decomposition. (a) Mean autocorrelation (blue solid curve) together with the sum of three Gaussian components (black dashed curve), and the individual components G₁, G₂ and G₃ corresponding to the average coherence spike, the single-shot bandwidth and a broad background, respectively. The narrowest component G₁ is used to place an upper bound on the spectrometer resolution, while G₂ provides an independent estimate of the average spectral bandwidth. (b) Residual of the mean autocorrelation with respect to the three-Gaussian fit.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 33| Part 5| September 2026|

https://doi.org/10.1107/S1600577526006739

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