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

Ulf Zastrau, Luke B. Fletcher, Eckhart Foerster +9

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 s…