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Redwine, R. P.

Paper Title Page
WEPMS056 High Current, Large Aperture, Low HOM, Single Crystal Nb 2.85GHz Superconducting Cavity 2472
 
  • Q. S. Shu, F. H. Lu, I. M. Phipps, J. L. Shi, J. T. Susta
    AMAC, Newport News, Virginia
  • R. P. Redwine, D. Wang, F. Wang
    MIT, Middleton, Massachusetts
 
  Funding: Footnotes: The project was funded by the US Department of Energy under contract DE-FG02-05ER84346

There is an increasing demand for High beam Current, high Radio-Frequency (RF) power S-band cavities in existing and new accelerator projects to produce a very brilliant, broadband, teraherz coherent synchrotron radiation source (CRS). To achieve this goal, the RF cavities must be upgraded to a gap voltage of 1.5 MV in the limited space available in the machine with a high gradient superconducting cavity. At the present time there are no cavities and accessories designed to support the high beam currents of up to 100 mA and at the same time provide a high gap voltage at such a high S-band frequency. AMAC proposed a High Current, Large Aperture, Low HOM, Single Crystal Nb 2.85GHz Superconducting Cavity with high RF Power Coupler and HOM absorber device. Comprehensive simulation and optimization to determine the SRF cavity parameters to meet the requirements, provided two alternate designs for the RF input couplers, performed a detailed Higher Order Modes (HOM) analysis, and proposed an HOM absorber concept to dampen the modes exited in the cavity due to the high beam current and high bunch intensity.