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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.}},
}