Keyword: dipole
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MOPB017 Multiphysics Simulations of the Wide Opened Waveguide Crab-cavity ion, cavity, HOM, impedance 90
 
  • K. Papke, A. Amorim Carvalho, A. Grudiev, C. Zanoni
    CERN, Geneva, Switzerland
  
  In the frame of a FCC study a first prototype of a compact superconducting crab-cavity, using Nb-on-Cu-coating technique is being manufactured and investigated. The design, which is based on the ridged waveguide resonator, is subjected to multipacting and pressure sensitivity simulations. First results of theses simulations are presented and compared to those of other SRF cavities. Furthermore, several aspects related to the design of the fundamental mode coupler and HOM dampers are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB017  
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MOPB074 Analysis of Higher Order Modes of the Superconducting Cavities for the China-ADS Injector-II in IMP ion, HOM, cavity, higher-order-mode 231
 
  • C. Zhang, L. Chen, Y. He, S.C. Huang, Y.L. Huang, T.C. Jiang, Y.M. Li, F. Pan, R.X. Wang, A.D. Wu, Q.J. Wu, W.M. Yue, S.H. Zhang, S.X. Zhang
    IMP/CAS, Lanzhou, People's Republic of China
  
  Funding: funded by Natural Science Foundation of China， No.11505253
The influence of the higher order modes on the beam dynamics and the cryogenic losses has been studied for the superconducting section of the CIADS project in this paper. In addition, the necessity of HOM dampers in the Superconducting (SC) cavities is discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB074  
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MOPB096 Estimation of Alignment Error by Measuring Higher-order-mode of Injector Superconducting Cavity at KEK-cERL cavity, ion, HOM, alignment 286
 
  • Y. Honda, E. Kako, T. Konomi, T. Miyajima, T. Obina, H. Sakai, K. Umemori
    KEK, Ibaraki, Japan
  
  Precise alignment of accelerator cavities is important in realizing a low emittance beam. Especially in the cases of superconducting cavities installed in a cryomodule, it is difficult to mechanically measure the position of the cavities. By measuring higher-order-modes (HOM) excited by a beam, the electrical center of the cavities can be estimated. We have developed a HOM measurement system for the injector superconducting accelerator cavities of KEK ERL test accelerator (cERL).Comparing the HOM signals of the three independent cavities in the cryomodule, we estimated the relative positioning errors of the three cavities.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB096  
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TUPB053 Lessons Learned from RF-Dipole Prototype Cavities for LHC High Luminosity Upgrade cavity, ion, HOM, luminosity 506
 
  • S.U. De Silva, J.R. Delayen
    ODU, Norfolk, Virginia, USA
  • Z. Li
    SLAC, Menlo Park, California, USA
  • H. Park
    JLab, Newport News, Virginia, USA
  
  The rf-dipole cavity has successfully demonstrated the principles of using a compact cavity operating in TE11-like mode in generating a transverse kick. Several proof-of-principle rf-dipole cavities have been fabricated and the rf tests have demonstrated high transverse gradients. The rf-dipole geometry has been adapted into a square-shaped geometry designed to meet the dimensional constraints for the LHC also maintaining crabbing in both horizontal and vertical planes. Recently, two prototype rf-dipole cavities intended for the test at SPS for have been completed that is designed to accommodate the FPC and HOM dampers. The performance during the rf tests have shown excellent results on achieving the design requirements of operation for the crab cavities for SPS. This paper presents the experiences and lessons learned during the cavity preparation and testing, including process validation, frequency tracking.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB053  
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TUPB054 RF Tests of RF-Dipole Prototype Crabbing Cavities for LHC High Luminosity Upgrade cavity, ion, HOM, luminosity 509
 
  • S.U. De Silva, J.R. Delayen
    ODU, Norfolk, Virginia, USA
  • Z. Li
    SLAC, Menlo Park, California, USA
  • H. Park
    JLab, Newport News, Virginia, USA
  
  The superconducting rf-dipole crabbing cavity is one of the two crabbing cavity designs proposed for the LHC high luminosity upgrade. The proof-of-principle (P-o-P) rf-dipole cavity operating at 400 MHz has demonstrated performance exceeding the design specifications. The prototype cavity for SPS beam test has been designed to include the fundamental power coupler, HOM couplers, and all the ancillary components intended to meet the design requirements. The crab cavities will be installed in the SPS beam line prior to the installation in LHC; this will be the first crabbing cavity operation on a proton beam. The fabrication of two prototype rf-dipole cavities is currently being completed at Jefferson Lab. This paper presents the details on cavity processing and cryogenic test results of the rf-dipole cavities.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB054  
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