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Min, M.

Paper Title Page
THPAN090 Fourier Spectral Simulation for Wake Field in Conducting Cavities 3432
  • M. Min, Y.-C. Chae, P. F. Fischer, K.-J. Kim
    ANL, Argonne, Illinois
  • Y. H. Chin
    KEK, Ibaraki
  Recent demand of short-bunch beams poses high-order computational tools for investigating beam dynamics in order to improve the beam quality. We have studied a new computational approach with spectrally accurate high-order approximation for wake field calculations. The technique employs the standard Fourier basis combined with a post-processing procedure for noise reduction by Gegenbauer reconstruction. We integrate this scheme into the existing 2D wake field calculation code ABCI and investigate possible enhancemance of its performance on the same grid base. We will demontrate 2D wake potential simulations for various cylindrically symmetric structures with the quality improvement in comparison to the conventional lower-order method.  
THPAN091 Spectral-Element Discontinuous Galerkin Simulations for Wake Potential Calculations: NEKCEM 3435
  • M. Min, Y.-C. Chae, P. F. Fisher
    ANL, Argonne, Illinois
  The demand for short bunches of 1 ps or less poses not only technical challenges in order to deliver the beams for leading-edge research but also poses computational challenges when it comes to investigating bunched multi-particle beam dynamics in order to improve the beam quality. We introduce a powerful high-order numerical tool based on spetral-element discretizations with discontinuous Galerkin approximation approach, which includes spectral element time domain solver for Maxwell's equation and electrostatic Poisson solver. We will demonstrate 3D simulations for wakefield and wake potential calculations in conducting cavity structures, as well as meshing and visualization components. We will discuss the overcome of the computational bottleneck by widely-used low-order finite difference programs for calculating wake field excited by 1-ps bunches, provided with performance and accuracy comparison.