Author: Zhang, T.J.
Paper Title Page
THAAI1 The Dark Current and Multipacting Capabilities in OPAL: Model, Benchmarks and Applications 201
 
  • C. Wang, Z.G. Yin, T.J. Zhang
    CIAE, Beijing, People's Republic of China
  • A. Adelmann
    PSI, Villigen, Switzerland
 
  Dark current and multiple electron impacts (multipacting), as for example observed in radio frequency (RF) structures of accelerators, are usually harmful to the equipment and the beam quality. These effects need to be suppressed to guarantee stable operation. Large scale simulations can be used to understand the cause and develop strategies to suppress these phenomena. We extend OPAL, a parallel framework for charged particle optics in accelerator structures and beam lines, with the necessary physics models to efficiently and precise simulate multipacting phenomenas. We added a Fowler-Nordheim field emission model, two secondary electron emission models, developed by Furman-Pivi and Vaughan respectively, as well as efficient 3D boundary geometry handling capabilities. The models and their implementation are carefully benchmark against a non-stationary multipacting theory for the classic parallel plate geometry. A dedicated, parallel plate experiment shows excellent agreement between theory, model/simulations and experiment.  
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