X-ray spectroscopic studies of a solid-density germanium plasma created by a free electron laser

0544064 - FZÚ 2022 RIV CH eng J - Journal Article
Perez-Callejo, G. - Vinko, S.M. - Ren, S. - Royle, R. - Humphries, O. - Preston, T.R. - Hammel, B.A. - Chung, H.-K. - Burian, Tomáš - Vozda, Vojtěch - Lin, M.-F. - van Driel, T.B. - Wark, J. S.
X-ray spectroscopic studies of a solid-density germanium plasma created by a free electron laser.
Applied Sciences-Basel. Roč. 10, č. 22 (2020), č. článku 8153. E-ISSN 2076-3417
R&D Projects: GA ČR(CZ) GA20-08452S; GA MŠMT LTT17015; GA MŠMT EF16_027/0008215
EU Projects: European Commission(XE) 654148 - LASERLAB-EUROPE
Grant - others:MOBILITY FZU(XE) CZ.02.2.69/0.0/0.0/16_027/0008215
Institutional support: RVO:68378271
Keywords : X-ray spectroscopy * germanium * solid density * LCLS
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 2.679, year: 2020
Method of publishing: Open access

The generation of solid-density plasmas in a controlled manner using an X-ray free electron laser (XFEL) has opened up the possibility of diagnosing the atomic properties of hot, strongly coupled systems in novel ways. Here, we extend the studies to the mid-Z(=32) element Germanium, where the XFEL creates copious L-shell holes, and the plasma conditions are interrogated by recording of the associated L-shell X-ray emission spectra. We present here a study of the effects of the FEL photon energy on the temperatures and electron densities created, and their uniformity in the FEL beam propagation direction. We show that good uniformity can be achieved by tuning the photon energy of the XFEL such that it does not overlap significantly with L-shell to M-shell bound-bound transitions, and lies below the L-edges of the ions formed during the heating process. Reasonable agreement between experiment and simulations is found for the emitted X-ray spectra.
Permanent Link: http://hdl.handle.net/11104/0321120