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@inproceedings{koopmans:ibic2021-weoa04, author = {M. Koopmans and J.-G. Hwang and A. Jankowiak and M. Ries and G. Schiwietz}, title = {{Bunch-Resolved 2D Diagnostics - Streaking Combined with Interferometry}}, booktitle = {Proc. IBIC'21}, pages = {332--336}, eid = {WEOA04}, language = {english}, keywords = {diagnostics, operation, polarization, storage-ring, MMI}, venue = {Pohang, Rep. of Korea}, series = {International Beam Instrumentation Conference}, number = {10}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {10}, year = {2021}, issn = {2673-5350}, isbn = {978-3-95450-230-1}, doi = {10.18429/JACoW-IBIC2021-WEOA04}, url = {https://jacow.org/ibic2021/papers/weoa04.pdf}, note = {https://doi.org/10.18429/JACoW-IBIC2021-WEOA04}, abstract = {{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. In addition, low-alpha operation and a possible VSR upgrade 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 also call for bunch-selective and correlated multi-parameter detection methods. Thus, the 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 baffle method *,**. The horizontal or vertical dimension can additionally be imaged with the streak camera and bunch-resolved 2D measurements are possible. Imaging the vertical direction, the characteristic dip in the center the interference pattern from pi-polarized synchrotron radiation can be observed and is used to extract bunch resolved information about the vertical beam size. The streak camera measurements are validated with direct imaging measurements from a regular CCD camera at the beamline and compared to model calculations. The results are converted into absolute values by a calibration with the BESSY II pinhole monitors.}}, }