Keyword: electromagnetic-fields
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THPB001 Propagation of the High Frequency Fields in the Chain of the Superconducting Cavities cavity, wakefield, resonance, accelerating-gradient 1049
 
  • A. Novokhatski
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the Department of Energy. Contract no.DOE-AC03-76SF00515.
Combination with the very high repetion rate requires to use the superconducting cavities to accelerate very short bunches for the FEL operation.. In the cavities these bunches excite very high frequency electromagnetic fields. There are severe concerns, that these fields will remain inside the structure for a long time, bring additional heating or even break up the Cooper pairs. We present results of the simulation of the transient dynamics of wake fields of very short bunches. We show how much of the energy is vanishing through the beam pipes immediately and how much energy is staying in the cavity for a long time. 		 
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THPB015 Design of a Medium Beta Half-Wave SC Prototype Cavity at IMP cavity, operation, linac, accelerating-gradient 1097
 
  • A.D. Wu, Y. He, T.C. Jiang, Y.M. Li, F.F. Wang, R.X. Wang, L.J. Wen, W.M. Yue, C. Zhang, S.H. Zhang, S.X. Zhang, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  
  A superconducting half-wave resonator has been designed with frequency of 325 MHz and beta of 0.51. The geometry parameters and the three shapes of inner conductors (racetrack, ring-shape and elliptical-shape) were studied in details to decrease the peak electromagnetic fields to obtain higher accelerating gradients and minimize the dissipated power on the RF walls. To suppress the operation frequency shift caused by the helium pressure fluctuations and maximize the tuner ranges, the frequency shifts and mechanical characters were simulated in the electric and magnetic areas separately. At the end, the helium vessel was also designed to keep stability as possible. The fabrication and test of the prototype will be complete at the beginning of 2016.  
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THPB051 Lorentz Detuning for a Double-Quarter Wave Cavity cavity, simulation, radiation, vacuum 1215
 
  • S. Verdú-Andrés, S.A. Belomestnykh, Q. Wu, B. P. Xiao
    BNL, Upton, Long Island, New York, USA
  • S.A. Belomestnykh
    Stony Brook University, Stony Brook, USA
  • J. Wang
    CST of America, Wellesley Hills, Massachusetts, USA
  
  Funding: Work supported by US DOE via BSA LLC contract No.DE-AC02-98CH10886 and US LARP program and by EU FP7 HiLumi LHC grant No.284404. Used NERSC resources by US DOE contract No.DE-AC02-05CH11231.
The Lorentz detuning is the resonant frequency change in an RF cavity due to the radiation pressure on the cavity walls. We present benchmarking studies of Lorentz detuning calculations for a Double-Quarter Wave Crab Cavity (DQWCC) using the codes ACE3P. The results are compared with the Lorentz detuning measurements performed during the cold tests of the Proof-of-Principle DQWCC at BNL. 		 
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