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@InProceedings{lumpkin:ibic2020-tupp17,
author = {A.H. Lumpkin and J.A. Diaz Cruz and A.L. Edelen and D.R. Edstrom and B.T. Jacobson and P.S. Prieto and J. Ruan and R.M. Thurman-Keup and F. Zhou},
% author = {A.H. Lumpkin and J.A. Diaz Cruz and A.L. Edelen and D.R. Edstrom and B.T. Jacobson and P.S. Prieto and others},
% author = {A.H. Lumpkin and others},
title = {{Direct Observations of Sub-micropulse Electron-beam Effects from Short-range Wakefields in TESLA-type Superconducting RF Cavities}},
booktitle = {Proc. IBIC'20},
pages = {56--60},
paper = {TUPP17},
language = {english},
keywords = {cavity, electron, wakefield, laser, HOM},
venue = {Santos, Brazil},
series = {International Beam Instrumentation Conference},
number = {9},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2020},
issn = {2673-5350},
isbn = {978-3-95450-222-6},
doi = {10.18429/JACoW-IBIC2020-TUPP17},
url = {https://www.jacow.org/ibic2020/papers/tupp17.pdf},
note = {https://doi.org/10.18429/JACoW-IBIC2020-TUPP17},
abstract = {The preservation of the low emittance of electron beams during transport in the accelerating structures of large facilities is an ongoing challenge. In the cases of the TESLA-type superconducting rf cavities currently used in the European X-ray Free-electron Laser (FEL) and the under construction Linac Coherent Light Source upgrade (LCLS-II), off-axis beam transport may result in emittance dilution due to transverse long-range and short-range wakefields (SRW)*. To investigate such effects, experiments were performed at the Fermilab Accelerator Science and Technology (FAST) facility with its unique two-cavity configuration after the photocathode rf gun. We used optical transition radiation (OTR) imaging with a UV-visible synchroscan streak camera to display sub-micropulse y-t effects in the 41-MeV beam. The head-tail transverse kicks within the 11-ps-long micropulses were observed at the 100-micron level for steering off-axis in one cavity and several 100 microns for two cavities. Since the SRW kick angles go inversely with energy, these results may inform the commissioning plans of the LCLS-II injector where beam will be injected at ~1 MeV into a cryomodule.},
}