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WEPPD005 |
Properties of Radiation from the European XFEL Undulator Prototype | |
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Funding: The program "Physics with Accelerators and Reactors in West Europe (except CERN)" In this contribution, we present an analysis of the experimentally measured magnetic field data from the planar hybrid 48 mm period undulator prototype for the European XFEL, and a simulation of expected radiation properties. Because of manufacturing errors, the magnetic field data include a small horizontal component, as well as some irregularities. A Fourier harmonics analysis was carried out. It was found that the vertical component of the measured magnetic field includes a sufficiently noticeable (about 10 percent relative to the fundamental) third harmonic component in addition to the fundamental harmonic. The radiation Stokes parameters are simulated from the experimentally measured magnetic field. Relying on computed radiation distributions, the effective magnetic field amplitude, the effective undulator period and deflection parameter are calculated. Simulations show that the intensity of the fundamental harmonic along the undulator axis is higher compared to the corresponding radiation intensity in the case of an ideal, purely sinusoidal magnetic field. The origin of this effect is analyzed. |
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