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![[Figure 1]](co5148fig1mag.jpg)
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Figure 1
A 6 µm-long flat-top model electron beam without energy chirp, see top left plot, used to generate SASE radiation. Lines I, γ, δγ, ɛxn, ɛyn depict electron beam current, energy (as Lorenz factor), energy spread and both horizontal and vertical normalized emittances, respectively. The radiation file is dumped during the exponential growth for 500 statistically independent events. SASE spectra are presented on the top right plot. The light gray area depicts spectral span of individual events, the dark gray line depicts a single event, and the black line provides the ensemble-averaged spectrum. The ensemble-averaged Wigner distribution of the SASE radiation is presented in the bottom left plot. Hereafter the diverging colormap of the Wigner distribution is normalized to its maximum absolute value, while its zero value is depicted with a white color. The spectrogram autocorrelation reconstruction R(s, ℏω/e) is presented in the bottom right plot. Colored lines in the top subplot show the corresponding line-offs of the reconstruction at different photon energies. These line-offs are normalized to 1 at their maximum value. The black line depicts an average of these line-offs. s = −ct is the coordinate along the radiation propagation direction. |
![[Figure 1]](co5148fig1.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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