| Paper |
Title |
Page |
| MOPP009 |
Copper Prototype Measurements of the HOM, LOM and SOM Couplers for the ILC Crab Cavity
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568 |
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- G. Burt, P. K. Ambattu, A. C. Dexter
Cockcroft Institute, Lancaster University, Lancaster
- L. Bellantoni
Fermilab, Batavia, Illinois
- P. Goudket, P. A. McIntosh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- Z. Li, L. Xiao
SLAC, Menlo Park, California
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The ILC Crab Cavity is positioned close to the IP and hence is very sensitive to the wakefields induced by the beam. A set of couplers were designed to couple to and hence damp the spurious modes of the crab cavity. As the crab cavity is a deflecting mode cavity, it operates using a dipole mode and has different damping requirements than an accelerating mode cavity. A separate coupler is required for the monopole modes below the operating frequency of 3.9 GHz, known as the LOMs, the opposite polarization of the operating mode, the SOM, and the modes above the operating frequency, the HOMs. Each of these couplers have been manufactured out of copper and measured attached to an aluminium nine cell prototype of the cavity and their external Q factors were measured. The results were found to agree well with numerical simulations.
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| THPC020 |
Emittance Exchange at the Fermilab A0 Photoinjector
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3020 |
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- T. W. Koeth
Rutgers University, The State University of New Jersey, Piscataway, New Jersey
- L. Bellantoni, H. T. Edwards, R. P. Fliller, A. H. Lumpkin, J. Ruan
Fermilab, Batavia, Illinois
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A transverse to longitudinal emittance exchange experiment is underway at the A0 Photoinjector at Fermilab. Our scheme employs a TM110 deflecting mode RF cavity between two magnetic doglegs proposed by Kim et. al. The beamline has been installed, characterization of the beamline is complete and data taking has begun. In this paper we report on efforts to date to observe the transverse to longitudinal emittance exchange. Measurements will be compared to analytical predictions and simulations.
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