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TY - CONF AU - Koopmans, M. AU - Hwang, J.-G. AU - Jankowiak, A. AU - Ries, M. AU - Schiwietz, G. ED - Kim, Changbum ED - Schaa, Volker R. W. ED - Kim, Dong-Eon ED - Lee, Jaeyu TI - Bunch-Resolved 2D Diagnostics - Streaking Combined with Interferometry J2 - Proc. of IBIC2021, Pohang, Rep. of Korea, 24-28 May 2021 CY - Pohang, Rep. of Korea T2 - International Beam Instrumentation Conference T3 - 10 LA - english AB - 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. PB - JACoW Publishing CP - Geneva, Switzerland SP - 332 EP - 336 KW - diagnostics KW - operation KW - polarization KW - storage-ring KW - MMI DA - 2021/10 PY - 2021 SN - 2673-5350 SN - 978-3-95450-230-1 DO - doi:10.18429/JACoW-IBIC2021-WEOA04 UR - https://jacow.org/ibic2021/papers/weoa04.pdf ER -