| Paper |
Title |
Page |
| MOPP156 |
Fabrication and Low Power Testing of an L-band Deflecting Cavity for Emittance-exchange at ANL
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916 |
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- J. Shi, H. Chen, W.-H. Huang, C.-X. Tang, D. Tong
TUB, Beijing
- W. Gai, C.-J. Jing, K.-J. Kim, J. G. Power
ANL, Argonne, Illinois
- D. Li
LBNL, Berkeley, California
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An L-Band RF deflecting cavity has been built at Tsinghua University for a planned transverse-to-longitudinal emittance exchange experiment at Argonne National Laboratory (ANL). The deflector is a 1.3-GHz, 3-cell cavity operated in a TM110-like mode that delivers a deflecting voltage of 3.4 MV. In this paper, we review the cavity design and present detail of the fabrication, cold testing and tuning progress. Cell radii were left undercut to account for simulation errors, which yielded a higher frequency in the first bench measurement but removed by the final tuning on the lathe. Field distribution on axis was measured using the ‘‘bead-pull'' method and tuned to balance in the 3 cells.
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| TUPP045 |
Studies of Beam Breakup in Dielectric Structures
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1643 |
| |
- A. Kanareykin, C.-J. Jing, A. L. Kustov, P. Schoessow
Euclid TechLabs, LLC, Solon, Ohio
- W. Gai, J. G. Power
ANL, Argonne, Illinois
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Beam breakup (BBU) effects resulting from parasitic wakefields provide a potentially serious limitation to the performance of dielectric structure based wakefield accelerators. We report on experimental and numerical investigation of BBU and its mitigation. The experimental program focuses on BBU measurements in a number of high gradient and high transformer ratio wakefield devices. New pickup-based beam diagnostics will provide methods for studying parasitic wakefields that are currently unavailable at the AWA facility. The numerical part of this research is based on a particle-Green’s function beam breakup code we are developing that allows rapid, efficient simulation of beam breakup effects in advanced linear accelerators. The goal of this work is to be able to compare the results of detailed experimental measurements with the accurate numerical results and to design an external FODO channel for the control of the beam in the presence of strong transverse wakefields.
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| WEPP148 |
Generation of High Gradient Wakefields in Dielectric Loaded Structures
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2835 |
| |
- 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, Illinois
- C.-J. Jing
Euclid TechLabs, LLC, Solon, Ohio
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Dielectric loaded wakefield structures have potential to be used as high gradient accelerator components. Using the high current drive beam at the Argonne Wakefield Accelerator Facility, we employed cylindrical dielectric loaded wakefield structures to generate accelerating fields of up to 100 MV/m. Short electron bunches (13 ps FWHM) of up to 86 nC are used to drive these fields, either as single bunches or as bunch trains. These recently tested 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 these high intensity RF fields serves to verify the absence of electric breakdown.
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