Design and performance characterisation of the HAPG von Hámos spectrometer at the high energy density instrument of the european XFEL

0539405 - FZÚ 2021 RIV GB eng J - Journal Article
Preston, T.R. - Goede, S. - Schwinkendorf, J.P. - Appel, K. - Brambrink, E. - Cerantola, V. - Hoeppner, H. - Makita, M. - Pelka, A. - Prescher, C. - Sukharnikov, K. - Schmidt, A. - Thorpe, I. - Toncian, T. - Amouretti, A. - Chekrygina, D. - Falcone, R.W. - Falk, Kateřina - Fletcher, L.B. - Galtier, E. - Harmand, M. - Hartley, N.J. - Hau-Riege, S.P. - Heimann, P. - Huang, L.G. - Humphries, O.S. - Karnbach, O. - Kraus, D. - Lee, H. J. - Nagler, B. - Ren, S. - Schuster, A.K. - Šmíd, M. - Voigt, K. - Zhang, M. - Zastrau, U.
Design and performance characterisation of the HAPG von Hámos spectrometer at the high energy density instrument of the european XFEL.
Journal of Instrumentation. Roč. 15, č. 11 (2020), s. 1-15, č. článku P11033. ISSN 1748-0221. E-ISSN 1748-0221
Institutional support: RVO:68378271
Keywords : plasma diagnostics interferometry, spectroscopy and imaging * spectrometers * X-ray detectors
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 1.415, year: 2020
Method of publishing: Open access

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.

Permanent Link: http://hdl.handle.net/11104/0317117