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@InProceedings{ruisard:napac2019-thzba4, author = {K.J. Ruisard and A.V. Aleksandrov and S.M. Cousineau and Z.L. Zhang}, title = {{Characterization and Modeling of High-Intensity Evolution in the SNS Beam Test Facility}}, booktitle = {Proc. NAPAC'19}, pages = {954--956}, paper = {THZBA4}, language = {english}, keywords = {emittance, simulation, diagnostics, lattice, controls}, venue = {Lansing, MI, USA}, series = {North American Particle Accelerator Conference}, number = {4}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {10}, year = {2019}, issn = {2673-7000}, isbn = {978-3-95450-223-3}, doi = {10.18429/JACoW-NAPAC2019-THZBA4}, url = {http://jacow.org/napac2019/papers/thzba4.pdf}, note = {https://doi.org/10.18429/JACoW-NAPAC2019-THZBA4}, abstract = {Modern high-power accelerators are charged with delivering reliable beam with low losses. Resolving the complex dynamics arising from space charge and nonlinear forces requires detailed models of the accelerator and particle-in-cell simulation. There has historically been discrepancy between simulated and measured beam distributions, particularly at the low-density halo level. The Beam Test Facility (BTF) at the Spallation Neutron Source is outfitted to study beam evolution in a high-power linear accelerator MEBT. This includes capability for high-dimensional measurements of the post-RFQ beam distribution, including interplane correlations that may be the key to accurate simulation. Beam is transported through a 4.6 m FODO channel (9.5 cells) to a second distribution measurement stage. Plans for validating simulations against BTF measurements of beam evolution in the FODO channel are discussed.}, }