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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 11: Diagnostics, Control and Instrumentation III

AKBP 11.6: Vortrag

Donnerstag, 18. März 2021, 17:45–18:00, AKBPa

Non-Destructive Bunch-Resolved 2D Beam Diagnostics at BESSY II — •Marten Koopmans, Ji-Gwang Hwang, Andreas Jankowiak, Markus Ries, Andreas Schälicke, and Gregor Schiwietz — Helmholtz-Zentrum Berlin

Due to the complexity of the filling pattern in 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. Low-α operation and a possible BESSY VSR upgrade, in addition, demand bunch-length measurements with picosecond resolution. Therefore a dedicated beamline equipped with a fast streak camera was set up and successfully commissioned. Couplings between time- and space-coordinates do also call for bunch-selective and correlated multi-parameter detection methods. Thus, the same beamline and the streak camera have been made capable of direct beam-profile imaging and interferometry of the vertical beam size using the X-ray blocker bar method. Dependent on the polarization choice of visible light one may switch between these diagnostic methods. With an additional transverse dimension in the streak-camera image, bunch-resolved 2D measurements are possible. In the vertical direction the characteristic dip in the center of the image of the π-polarized synchrotron radiation can be observed at the streak camera. We also present a new method to study the properties of the PPRE bunch. Applying a statistical analysis of single-shot images enables one to distinguish between horizontal orbital motion and the broadening of the bunch due to the excitation. The results are compared with data from the BPM system.