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TY - CONF AU - Yang, X. AU - Doom, L. AU - Fedurin, M.G. AU - Hidaka, Y. AU - Li, J.J. AU - Padrazo Jr, D. AU - Shaftan, T.V. AU - Smaluk, V.V. AU - Wan, W. AU - Wang, G.M. AU - Yu, L.-H. AU - Zhu, Y. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Tuning Quadrupoles for Brighter and Sharper Ultra-fast Electron Diffraction Imaging J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - We report our proof-of-principle design and experi-mental commissioning of broadly tunable and low-cost transverse focusing lens system for MeV-energy electron beams at the ultra-fast electron diffraction (UED) beam-line of the Accelerator Test Facility II of BNL. We exper-imentally demonstrate the independent control over the size and divergence of the electron beam at the sample via tunable quadrupoles. By applying online optimiza-tion, we achieve minimum beam sizes 75 µm from 1 to 13 pC, two orders of magnitude higher charge density than previously achieved using conventional solenoid tech-nique. Finally, we experimentally demonstrate Bragg-diffraction image (BDI) with significant improvement up to 3 times brighter and 2 times sharper BDI peaks via the optimized quadrupoles, improvement larger with higher charge. The result could be crucial for the future single-shot ultra-fast electron microscope development. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3571 EP - 3573 KW - quadrupole KW - electron KW - focusing KW - experiment KW - solenoid DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPMP053 UR - http://jacow.org/ipac2019/papers/thpmp053.pdf ER -