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@inproceedings{halavanau:ipac2021-mopab101, author = {A. Halavanau and S.J. Gessner and C.E. Mayes and J.B. Rosenzweig}, title = {{Hollow and Flat Electron Beam Generation at FACET-II}}, booktitle = {Proc. IPAC'21}, pages = {376--378}, eid = {MOPAB101}, language = {english}, keywords = {electron, emittance, wakefield, quadrupole, experiment}, venue = {Campinas, SP, Brazil}, series = {International Particle Accelerator Conference}, number = {12}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {08}, year = {2021}, issn = {2673-5490}, isbn = {978-3-95450-214-1}, doi = {10.18429/JACoW-IPAC2021-MOPAB101}, url = {https://jacow.org/ipac2021/papers/mopab101.pdf}, note = {https://doi.org/10.18429/JACoW-IPAC2021-MOPAB101}, abstract = {{In this proceeding, we investigate hollow and flat electron beam generation at FACET-II facility. We focus on the case of a circular beamlet arrangement, also known as ’necklace’ beams. We study, via numerical simulations, the resulting e-beam dynamics in the FACET-II photoinjector, beam propagation through the high energy section, as well as possible experimental applications of the ’necklace’ beams. Finally, we evaluate the feasibility of high charge flat beam generation.}}, }