Abstract
An X-ray prism for the extraction of a specific harmonic of undulator radiation is proposed. By using the prism in a grazing incidence geometry, the beam axes of fundamental and harmonics of undulator radiation are separated with large angles over 10 µrad, which enables the selection of a specific harmonic with the help of apertures, while keeping a high photon flux. The concept of the harmonic separation was experimentally confirmed using X-ray beams from the X-ray free-electron laser SACLA.
Highlights
Continuous evolution of synchrotron radiation (SR) X-ray sources has strongly driven innovative sciences
The nextgeneration SR X-ray sources based on a multi-bend achromat lattice (Hettel, 2014; Einfeld et al, 2014), sometimes called diffraction-limited storage rings, are currently emerging (Biasci et al, 2014; Eriksson et al, 2014; Yabashi & Tanaka, 2017)
Compared with the present third-generation SR sources, the new SR sources produce X-ray beams from electron beams with much smaller emittances closer to a natural emittance of X-ray light, which significantly enhances the brilliance of undulator radiation
Summary
Continuous evolution of synchrotron radiation (SR) X-ray sources has strongly driven innovative sciences. If the angular separation is larger than the beam divergence, we can extract a specific harmonic radiation by setting an exit aperture.
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