Abstract
A transverse kick resulting from the coaxial rf coupler in an rf gun has been systematically studied in simulations and further characterized in experiments.
Highlights
The European X-ray Free-Electron Laser (EuXFEL) provides excellent opportunities in pursuing excellence in frontier science and advanced interdisciplinary applications of coherent x-ray radiation [1,2,3,4]
The photoelectron source in use at the EuXFEL is a photocathode rf gun developed at the photoinjector test facility at DESY in Zeuthen (PITZ) [5,6]
It is found that the kick depends on the start phase and the frequency detuning of the gun cavity
Summary
The European X-ray Free-Electron Laser (EuXFEL) provides excellent opportunities in pursuing excellence in frontier science and advanced interdisciplinary applications of coherent x-ray radiation [1,2,3,4]. The power coupler introduces an asymmetry to the cylindrical symmetry of the fundamental electromagnetic mode of the gun cavity [9,10]. This distorts the rf field distribution of the fundamental mode. The induced rf field asymmetries create a transverse kick onto the electron bunch [37,38]
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