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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 11: Diagnostics, Syn. radiation and FELs

AKBP 11.1: Vortrag

Mittwoch, 18. März 2020, 09:30–09:45, MOL 213

2D Analysis of Excited-Bunch Dynamics at BESSY II — •Marten Koopmans, Ji-Gwang Hwang, Andreas Jankowiak, Markus Ries, and Gregor Schiwietz — Helmholtz-Zentrum Berlin

With the VSR upgrade for the BESSY II electron-storage ring bunch resolved diagnostics are required for machine commissioning and to ensure the long-term quality and stability of operation. For bunch-length measurements a dedicated beamline equipped with a fast streak camera was set up and successfully commissioned. The beamline is also capable of direct beam-profile imaging and interferometry of the vertical beam size using the X-ray blocker bar. While optimizations are still ongoing, 2D bunch-resolved measurements with an additional transverse dimension are already possible with the streak camera.

Using this potential, we present a new method to study the properties of the "pulse picking by resonant excitation" (PPRE) bunch. Applying a statistical analysis to single shot (of a single turn) images, enables to distinguish between horizontal orbit motion and the broadening of the bunch due to the excitation. The results are compared with data from the beam position monitor system.