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@inproceedings{lumpkin:ipac2021-tupab272,
author = {A.H. Lumpkin and J.A. Diaz Cruz and D.R. Edstrom and B.T. Jacobson and A. Lunin and P.S. Prieto and J. Ruan and J.P. Sikora and R.M. Thurman-Keup},
% author = {A.H. Lumpkin and J.A. Diaz Cruz and D.R. Edstrom and B.T. Jacobson and A. Lunin and P.S. Prieto and others},
% author = {A.H. Lumpkin and others},
title = {{Observation of Long-Range Wakefield Effects Generated in an Off-Resonance Tesla-Type Cavity}},
booktitle = {Proc. IPAC'21},
pages = {2101--2104},
eid = {TUPAB272},
language = {english},
keywords = {cavity, HOM, electron, resonance, wakefield},
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-TUPAB272},
url = {https://jacow.org/ipac2021/papers/tupab272.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-TUPAB272},
abstract = {{The interest in controlling emittance dilution effects due to off-axis beam transport in accelerator cavities and the resulting dipolar modes is especially important for the facilities with lower emittance beams. The Fermilab Accelerator Science and Technology (FAST) facility has a unique configuration of two single cavities after the photocathode rf gun followed by a cryomodule. The second capture cavity (CC2) was run 15 kHz off resonance and without rf power while a 25-MeV beam was injected into it. The beam centroid effects were tracked by 10 rf button BPMs with bunch-by-bunch position readout capability downstream in a 12-m drift. Possible LRW effects seemed to dominate our previously observed near-resonant HOM effects at mode 14 in this cavity. This mode also shifted in frequency compared to that of the tuned case based on direct measurements. Submacropulse vertical position slewing of 1400 microns at 11 m downstream was observed with a 125 pC/bunch, 50 bunches per macropulse, and 25-MeV beam. The y-position slew amplitudes as a function of z were also measured. Horizontal positions also showed a slew effect. Both are emittance-dilution effects which one wants to mitigate.}},
}