Keyword: superconductivity
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MOPC102 RF and Surface Properties of Superconducting Samples niobium, quadrupole, cavity, superconducting-cavity 310
 
  • T. Junginger, W. Weingarten
    CERN, Geneva, Switzerland
  • T. Junginger
    MPI-K, Heidelberg, Germany
  • R. Seviour
    Lancaster University, Lancaster, United Kingdom
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
 
  Funding: Work supported by the German Doctoral Students program of the Federal Ministry of Education and Research (BMBF)
The surface resistance Rs of superconducting cavities can be obtained from the unloaded quality factor Q0. Since Rs varies strongly over the cavity surface its value must be interpreted as averaged over the whole cavity surface. A more convenient way to investigate the surface resistance of superconducting materials is therefore to examine small samples, because they can be manufactured cheaply, duplicated easily and used for further surface analyses. At CERN a compact Quadrupole Resonator has been developed for the RF characterization of superconducting samples at different frequencies. In this contribution, results from measurements on bulk niobium and niobium film on copper samples are presented. It is shown how different contributions to the surface resistance depend on temperature, applied RF magnetic field and frequency. Furthermore, measurements of the maximum RF magnetic field as a function of temperature and frequency in pulsed and CW operation are presented. The study is accompanied by measurements of the surface properties of the samples by various techniques.
 
 
MOPC121 Design of Low-frequency Superconducting Spoke Cavities for High-velocity Applications cavity, impedance, HOM, linac 364
 
  • J.R. Delayen, C.S. Hopper
    ODU, Norfolk, Virginia, USA
  • R.G. Olave
    Old Dominion University, Norfolk, Virginia, USA
 
  Superconducting single- and multi-spoke cavities have been designed to-date for particle velocities from β~0.15 to β~0.65. Superconducting spoke cavities may also be of interest for higher-velocity, low-frequency applications, either for hadrons or electrons. We present the design of 325 and 352 MHz spoke cavities optimized for β=0.8 and β=1.  
 
THPO015 External Energy Dump for Superconducting Magnet of the Uni-polar Power System power-supply, controls, simulation, HOM 3367
 
  • Y.S. Wong, K.-B. Liu, W.S. Wen
    NSRRC, Hsinchu, Taiwan
 
  This thesis focuses on the design of superconducting discharge energy circuit structure in Uni-polar power supply [1]~[3]. Superconductivity is an electrical resistance of exactly zero which occurs in certain materials below a characteristic temperature [4]. It’s operation at the steady state in constant temperature area. When Rise up resistance and temperature of superconductivity will have been dissipates function. Uni-polar power supply has needed to design discharge energy circuit when superconductor reduces the current. To make use release the energy transfers to external circuit keep the constant temperature with the superconductivity. The superconducting coil wingding has a total length magnetic period of 56.56cm, total magnet length of 478.9cm and vertical (horizontal) magnetic field of 18.7T.