The von Hámos spectrometer setup at the HED instrument of the European XFEL is described in detail. The spectrometer is designed to be operated primarily between 5 and 15 keV to complement the operating photon energy range of the HED instrument. Four Highly Annealed Pyrolitic Graphite (HAPG) crystals are characterised with thicknesses of 40 μm or 100 μm and radius-of-curvature 50 mm or 80 mm, in conjunction with either an ePix100 or Jungfrau detector. The achieved resolution with the 50 mm crystals, operated between 6.5 and 9 keV, matches that reported previously: ∼8 eV for a thickness of 40 μm, whereas, with an 80 mm crystal of thickness 40 μm, the resolution exceeds that expected. Namely, a resolution of 2 eV is demonstrated between 5-6 keV implying a resolving power of 2800. Therefore, we posit that flatter HAPG crystals, with their high reflectivity and improved resolving power, are a powerful tool for hard x-ray scattering and emission experiments allowing unprecedented measurements of collective scattering in a single shot.

Preston, T., Goede, S., Schwinkendorf, J., Appel, K., Brambrink, E., Cerantola, V., et al. (2020). Design and performance characterisation of the HAPG von H??mos Spectrometer at the High Energy Density Instrument of the European XFEL. JOURNAL OF INSTRUMENTATION, 15(11) [10.1088/1748-0221/15/11/p11033].

Design and performance characterisation of the HAPG von H??mos Spectrometer at the High Energy Density Instrument of the European XFEL

V. Cerantola;
2020

Abstract

The von Hámos spectrometer setup at the HED instrument of the European XFEL is described in detail. The spectrometer is designed to be operated primarily between 5 and 15 keV to complement the operating photon energy range of the HED instrument. Four Highly Annealed Pyrolitic Graphite (HAPG) crystals are characterised with thicknesses of 40 μm or 100 μm and radius-of-curvature 50 mm or 80 mm, in conjunction with either an ePix100 or Jungfrau detector. The achieved resolution with the 50 mm crystals, operated between 6.5 and 9 keV, matches that reported previously: ∼8 eV for a thickness of 40 μm, whereas, with an 80 mm crystal of thickness 40 μm, the resolution exceeds that expected. Namely, a resolution of 2 eV is demonstrated between 5-6 keV implying a resolving power of 2800. Therefore, we posit that flatter HAPG crystals, with their high reflectivity and improved resolving power, are a powerful tool for hard x-ray scattering and emission experiments allowing unprecedented measurements of collective scattering in a single shot.
Articolo in rivista - Articolo scientifico
Plasma Diagnostics - interferometry; spectroscopy and imaging; Spectrometers; X-ray detectors;
English
2020
15
11
P11033
none
Preston, T., Goede, S., Schwinkendorf, J., Appel, K., Brambrink, E., Cerantola, V., et al. (2020). Design and performance characterisation of the HAPG von H??mos Spectrometer at the High Energy Density Instrument of the European XFEL. JOURNAL OF INSTRUMENTATION, 15(11) [10.1088/1748-0221/15/11/p11033].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/397750
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