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Steiner, B.

Paper Title Page
MOPAN013 Wien Filter as a Spin Rotator at Low Energy 170
 
  • B. Steiner, W. Ackermann, W. F.O. Muller, T. Weiland
    TEMF, Darmstadt
  
  Funding: Work supported by DFG under contract SFB 634

The Wien filter is well known as a common energy analyzer and is also used more and more as a compact variant of a spin rotator at low energy for electrons. The Wien filter based on a homogenous magnetic and electric field that are perpendicular to each other and transverse to the direction of the electrons. The rotation of the spin vector is caused by the magnetic field. If the force equilibrium condition is fulfilled the beam should not be deflected at the Wien filter. Simulations show that in the fringe fields the electrons get a kick. Therefore full 3D simulations of the electromagnetic fields and beam dynamics simulations are studied in detail at the example of the Wien filter at the new polarized 100 keV electron injector at the S-DALINAC. The results of the simulations with CST Design Environment(TM), MAFIA and V-Code are presented.

 
THPAN019 Utilizing a Wien Filter within the Beam Dynamics Simulation Tool V-Code 3265
 
  • W. Ackermann, W. F.O. Muller, B. Steiner, T. Weiland
    TEMF, Darmstadt
  • J. Enders, C. Heßler, Y. Poltoratska
    TU Darmstadt, Darmstadt
  
  Funding: This work was partially funded by EUROFEL (RIDS-011935), DESY Hamburg, and DFG (SFB 634).

Beam dynamics simulations for computationally large problems are challenging tasks. On the one hand, to accurately simulate the electromagnetic field distribution within the whole device and the surrounding environment it is essential to consider all necessary device components including even small geometry details, complicated material distributions and the field excitations. On the other hand, further computational effort has to be put into precise modeling of the injected particle beam for detailed beam dynamics simulations. Under linear conditions, it is possible to separate the field calculation of the device from the computation of the particles self-field which can result in the proper application of diverse numerical schemes for the individual field contributions. In the paper it is demonstrated how the static electric and magnetic fields of a Wien filter beam line element can be treated as applied external fields within the beam dynamics simulation tool V-Code under the assumption that the interaction of the particle beam with the surrounding materials can be neglected.