23 May 2017 Magnetic force study for the helical afterburner for the European XFEL
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At present the SASE3 undulator line at the European XFEL is using a planar undulator producing linear polarized soft Xray radiation only. In order to satisfy the demand for circular polarized radiation a helical undulator system, the so-called afterburner is in construction. It will be operated as a radiator using the pre-bunched beam of the SASE3 undulator system. Among several options for the magnetic structure the Apple-X geometry was chosen. This is a pure permanent magnet undulator using NdFeB material. Four magnet arrays are arranged symmetrically the beam axis. Polarization can be changed by adjusting the phase shift (PS) between the two orthogonal structures. The field strength can be adjusted either by gap adjustment or alternatively by the amplitude shift (AS) scheme. For an engineering design the maximum values of forces and torques on each of the components under worst case operational conditions are important. The superposition principle is used to reduce calculation time. It is found that the maximum forces Fx, Fy and Fz for a 2m long Apple-X undulator are 1.8*104N, 2.4*104N and 2.3*104N, respectively. More results are presented in this paper.
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Peng Li, Peng Li, Tao Wei, Tao Wei, Yuhui Li, Yuhui Li, Joachim Pflueger, Joachim Pflueger, } "Magnetic force study for the helical afterburner for the European XFEL ", Proc. SPIE 10237, Advances in X-ray Free-Electron Lasers Instrumentation IV, 102370Z (23 May 2017); doi: 10.1117/12.2264695; https://doi.org/10.1117/12.2264695

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