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Figure 21
The average longitudinal bunch profile measured at a beam current of 70 mA with longitudinal feedback ON and OFF. The Landau cavities were not tuned in during these measurements, and the wider profile of the unstable beam is mainly a result of the bunches oscillating around their equilibrium, and not due to bunch lengthening. The bunch profile is obtained by measuring the temporal structure of the dipole light with an optical sampling oscilloscope (Breunlin & Andersson, 2016aBB15).

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