Bent crystal spectrometer for both frequency and wavenumber resolved x-ray scattering at a seeded free-electron laser

We present a cylindrically curved GaAs x-ray spectrometer with energy resolution \(\Delta E/E = 1.1\cdot 10^{-4}\) and wave-number resolution of \(\Delta k/k = 3\cdot 10^{-3}\), allowing plasmon scattering at the resolution limits of the Linac Coherent Light Source (LCLS) x-ray free-electron laser....

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Bibliographic Details
Published in:arXiv.org 2014-07
Main Authors: Zastrau, Ulf, Fletcher, Luke B, Foerster, Eckhart, Galtier, Eric Ch, Gamboa, Eliseo, Glenzer, Siegfried H, Heimann, Philipp, Marschner, Heike, Nagler, Bob, Schropp, Andreas, Wehrhan, Ortrud, Lee, Hae Ja
Format: Article
Language:English
Subjects:
Blurring
Coherent light
Coherent scattering
Energy resolution
Free electron lasers
Rangefinding
Wavelengths
X ray spectrometers
X-ray scattering
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Summary:We present a cylindrically curved GaAs x-ray spectrometer with energy resolution \(\Delta E/E = 1.1\cdot 10^{-4}\) and wave-number resolution of \(\Delta k/k = 3\cdot 10^{-3}\), allowing plasmon scattering at the resolution limits of the Linac Coherent Light Source (LCLS) x-ray free-electron laser. It spans scattering wavenumbers of 3.6 to \(5.2/\)\AA\ in 100 separate bins, with only 0.34\% wavenumber blurring. The dispersion of 0.418~eV/\(13.5\,\mu\)m agrees with predictions within 1.3\%. The reflection homogeneity over the entire wavenumber range was measured and used to normalize the amplitude of scattering spectra. The proposed spectrometer is superior to a mosaic HAPG spectrometer when the energy resolution needs to be comparable to the LCLS seeded bandwidth of 1~eV and a significant range of wavenumbers must be covered in one exposure.
ISSN:2331-8422
DOI:10.48550/arxiv.1407.7489