| Paper |
Title |
Page |
| MOP067 |
High Gradient Excitation and RF Power Generation Using Dielectric Loaded Wakefield Structures
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232 |
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- M.E. Conde, S.P. Antipov, F.J. Franchini, W. Gai, F. Gao, R. Konecny, W. Liu, J.G. Power, Z.M. Yusof
ANL, Argonne
- C.-J. Jing
Euclid TechLabs, LLC, Solon, Ohio
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Funding: Work supported by the U.S. Department of Energy under contract No. DE-AC02-06CH11357.
Dielectric loaded wakefield structures are being developed to be used as high gradient accelerator components. The high current electron beam at the Argonne Wakefield Accelerator Facility was used to excite wakefields in cylindrical dielectric loaded wakefield structures in the frequency range of 8 to 14 GHz, with pulse duration of a few nanoseconds. Short electron bunches (13 ps FWHM) of up to 86 nC drove these wakefields, and accelerating fields as high as 100 MV/m were reached. These standing-wave structures have a field probe near the outer edge of the dielectric to sample the RF fields generated by the electron bunches. Monitoring of the field probe signal serves to verify the absence of electric breakdown. Similar structures were used to extract RF power from the electron beam; however, in this case they were travelling-wave structures, driven by electron bunch trains of up to 16 bunches. RF pulses of up to 40 MW were measured at the output coupler of these structures.
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| TUP107 |
Longitudinal Beam Diagnostics for the ILC Injectors and Bunch Compressors
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655 |
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- P. Piot
Fermilab, Batavia
- A. Bracke, T.J. Maxwell, D. Mihalcea, M.M. Rihaoui
Northern Illinois University, DeKalb, Illinois
- C.-J. Jing
Euclid TechLabs, LLC, Solon, Ohio
- J.G. Power
ANL, Argonne
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Funding: Work supported by US. Department of Energy, under Contract No. DE-FG02-06ER41435 with Northern Illinois University.
We present a diagnostics suite and analyze techniques for setting up the longitudinal beam dynamics in ILC electron injectors and bunch compressors. Techniques to measure first order moment and recover the first order longitudinal transfer map of the injector intricate bunching scheme are presented. Coherent transition radiation diagnotics needed to measure and monitor the bunch length downstream of the ~5 GeV bunch compressor are investigated using a vector diffraction model. We finally introduce a new diagnostics capable of measuring time-transverse correlation along a single bunch. Such a diagnostics should be valuable for controlling emittance dilution via transverse wakefield and for properly setting the crab cavities needed for maximizing luminosity for non-zero crossing angle at the interaction point.
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