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This work demonstrates that periodic transient beam loading can affect bunch lengthening as well as cause its variation over time in Diamond-II. The instability can be eliminated by increasing the detuning of the harmonic cavity. The results suggest that introducing longer gaps in the filling pattern might eliminate the instability, but this will reduce the effectiveness of the passive harmonic cavity. Next, this study explores the option of creating a charge variation within the train of the hybrid-fill pattern. This technique can help to flatten the bunch-length variation as well as increase the bunch length in the timing bunch. Finally, the bunch-compression regime was explored using the standard-fill pattern without collective effects. It was found that the harmonic cavity can be detuned such that it shortens bunches instead of elongating them.
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