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TY - CONF AU - Siano, M. AU - Butti, D. AU - Goetz, A. AU - Iriso, U. AU - Lefèvre, T. AU - Mazzoni, S. AU - Nosych, A.A. AU - Paroli, B. AU - Potenza, M.A.C. AU - Solano, E. AU - Teruzzi, L. AU - Torino, L. AU - Trad, G. ED - Kim, Changbum ED - Schaa, Volker R. W. ED - Kim, Dong-Eon ED - Lee, Jaeyu TI - Two-Dimensional Beam Size Measurements with X-Ray Heterodyne Near Field Speckles 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 - We report on 2D beam size measurements with a novel interferometric technique named Heterodyne Near Field Speckles, capable of resolving few-micrometer beam sizes. It relies on the interference between the weak spherical waves scattered by a colloidal suspension and the intense transilluminating X-ray beam. Fourier analysis of the resulting speckles enables full 2D coherence mapping of the incoming radiation, from which the beam sizes along the two orthogonal directions are retrieved. We show experimental results obtained with 12.4 keV X-rays at the NCD-SWEET undulator beamline at ALBA, where the vertical beam size has been changed between 5 and 15 micrometers by varying the beam coupling. The results agree well with the estimated beam sizes from the pinhole calculations. Finally, we discuss recent investigations on alternative targets aimed at improving the signal-to-noise ratio of the technique. PB - JACoW Publishing CP - Geneva, Switzerland SP - 176 EP - 179 KW - coupling KW - radiation KW - undulator KW - synchrotron KW - experiment DA - 2021/10 PY - 2021 SN - 2673-5350 SN - 978-3-95450-230-1 DO - doi:10.18429/JACoW-IBIC2021-TUOA06 UR - https://jacow.org/ibic2021/papers/tuoa06.pdf ER -