Author: De Silva, S.U.
Paper Title Page
FRTU1
Superconducting Cavities of Interesting Shapes (Non-Elliptical Cavities)  
 
  • S.U. De Silva
    ODU, Norfolk, Virginia, USA
 
  The Superconducting Cavities of Interesting Shapes’ tutorial introduces the basics of non-elliptical cavities. The non-elliptical cavity types discussed includes cavities for accelerating particle beams and deflecting and crabbing beams. The types of cavities are categorized based on electromagnetic field profiles for easier understanding and characterization of cavity properties. The quarte wave resonator, half wave resonator and spoke cavities are discussed in detail. The practical applications of such cavities are also discussed for both accelerating and deflecting/crabbing cavities. Further details of cavity selection for different applications and mechanical properties are also presented.  
slides icon Slides FRTU1 [18.613 MB]  
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TUFUB7 Measurement of Surface Resistance Properties with Coaxial Resonators - Review 374
 
  • H. Park, S.U. De Silva, J.R. Delayen
    ODU, Norfolk, Virginia, USA
 
  Achieving ever decreasing surface resistance at higher field in superconducting RF accelerating structures is one of most outstanding developments in modern accelerators. The BCS theory has been used widely to estimate the surface resistance and to direct the technology. However, recent research results show that the behavior of the surface resistance further deviates from the BCS theory. So far the study on surface resistance was performed usually with cavities of single frequency which limited the study of frequency dependent surface resistance. The Center for Accelerator Science at Old Dominion University has designed and built several half wave coaxial cavities to study the frequency, temperature, and RF field dependence of surface resistance. TRIUMF in Canada also joined this line of research using such multi frequency quarter wave and half wave coaxial cavities. This type of multi mode cavity will allow us to systematically study the parameters affecting surface resistance on the same cavity surface. In this paper, we review the results ODU and TRIUMF collected so far and proper analysis methods.  
slides icon Slides TUFUB7 [3.551 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-TUFUB7  
About • paper received ※ 01 July 2019       paper accepted ※ 12 July 2019       issue date ※ 14 August 2019  
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FRCAA1 Overview of SRF Deflecting and Crabbing Cavities 1192
 
  • S.U. De Silva
    ODU, Norfolk, Virginia, USA
 
  Developments over the past few years on novel superconducting deflecting and crabbing cavities have introduced advanced rf geometries with improved performance, in comparison to the typical squashed elliptical cavities operating in TM110 type mode. These new structures are compact geometries operating in either TEM type or TE11-like mode. One of the key applications of such cavities is the use of crabbing systems for circular colliders in increasing the luminosity. Crabbing systems are an essential component in future colliders with intense beams and proposed electron-ion colliders. High luminosity upgrade of LHC is planned to implement crabbing systems at two interaction points. Recently, a two-cavity cryomodule with double quarter wave crabbing cavity was installed in SPS at CERN and successfully tested with the proton beam. We present the details of different superconducting deflecting and crabbing cavities and their applications, as well as the recent results of the crabbing systems test at SPS.  
slides icon Slides FRCAA1 [14.149 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2019-FRCAA1  
About • paper received ※ 04 July 2019       paper accepted ※ 14 August 2019       issue date ※ 14 August 2019  
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