Dresden 2014 – wissenschaftliches Programm

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BE: Beschleunigerphysik

BE 11: Accelerator Physics Poster Session

BE 11.10: Poster

Mittwoch, 2. April 2014, 17:00–19:30, P4

Numerical Calculation of Electromagnetic Fields in Acceleration Cavities Under Precise Consideration of Coupler Structures — •Cong Liu, Wolfgang Ackermann, Wolfgang F.O. Müller, and Thomas Weiland — Institut für Theorie Elektromagnetischer Felder, TU Darmstadt, Darmstadt, Germany

During the design phase of superconducting radio frequency (RF) accelerating cavities a challenging and difficult task is to determine the electromagnetic field distribution inside the structure with the help of proper computer simulations. In reality, because energy transfer occurs in the dissipative superconducting cavities, the numerical eigenmode analysis based on real-valued variables is no longer suitable to describe the dissipative acceleration structure. Dissipation can occur with the help of dedicated higher order mode (HOM) couplers, the power coupler as well as the beam tube once the resonance frequency is above the cutoff frequency of the corresponding waveguide. At the Computational Electromagnetics Laboratory (TEMF) a robust parallel eigenmode solver based on complex-valued finite element analysis is available. The eigenmode solver has been applied to the TESLA 1.3 GHz cavity and the third harmonic nine-cell cavity (3.9 GHz) to determine the resonance frequency, the quality factor and the corresponding field distribution of eigenmodes.