Figure 3
Experimental data: (a) Three revolution plots of 6000 consecutive measurements (corresponding to 18 synchrotron oscillations) of the electron bunch charge density taken from a longer data set with 500,000 measurements (\(\sim \) 0.18 s). For each revolution plot, the measurements are concatenated from left to right. The value for \(\Delta \)t is determined by the pixel number of the line array, calibration measurements39 and the mean bunch profile position. (b) Corresponding reconstructions of the PSD for different time intervals. The numbers refer to the time intervals marked in the revolution plots on the left side, respectively. Upper side: reconstructions for different subtraction percentages of the mean bunch profile are compared for the first revolution plot. The dynamic cycle of the microbunching instability is repeated over and over again, as it can be seen by comparing the rows of the reconstructed PSDs for the different revolution plots. In the supplement, we provide an animation of the PSD development, which is derived from the first revolution plot. To provide the optimal contrast, we normalized the data for every image independently. The color scale of the present and previous Fig. was calculated from a data set provided by P Kovesi41,42. An independent calculated gray scale image is provided by the supplementary Fig. S1.
