Demonstration of a laser-driven, narrow spectral bandwidth x-ray source for collective x-ray scattering experiments
| Autor: | Laurent Divol, Michael MacDonald, Dominik Kraus, S. H. Glenzer, Otto Landen, Luke Fletcher, Heath LeFevre, Sallee Klein, Maximilian Schörner, Paul Neumayer, Tilo Döppner, Benjamin Bachmann, Roger Falcone, N. Whiting, Mandy Bethkenhagen, Ronald Redmer, Alison Saunders, M. D. Doyle |
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| Přispěvatelé: | Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Electron density Scattering Thomson scattering Bandwidth (signal processing) Inelastic scattering Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Computational physics [SDU]Sciences of the Universe [physics] 0103 physical sciences Emission spectrum Spectral resolution 010306 general physics Plasmon |
| Zdroj: | Physics of Plasmas 28(2021), 032708 Physics of Plasmas Physics of Plasmas, 2021, 28, ⟨10.1063/5.0030958⟩ |
| ISSN: | 1070-664X 1089-7674 |
| Popis: | International audience; X-ray Thomson scattering (XRTS) is a powerful diagnostic technique that involves an x-ray source interacting with a dense plasma sample, resulting in a spectrum of elastically and inelastically scattered x-rays. Depending on the plasma conditions, one can measure a range of parameters from the resulting spectrum, including plasma temperature, electron density, and ionization state. To achieve sensitivity to collective electron oscillations, XRTS measurements require limited momentum transfer where the spectral separation of elastic and inelastic scattering is small. Such measurements require an x-ray probe source with a narrow bandwidth in order to reduce the spectral overlap between scattering contributions, allowing for the different features to be more precisely deconvolved. In this investigation, we discuss the theory behind how the bandwidth for a common XRTS probe, Zn He-α emission at 9 keV, can be reduced using a Cu K-edge filter. Proof-of-principle experiments conducted at the OMEGA laser facility confirm that this is an effective method for attenuating the higher energy He-α peak in the Zn emission spectrum. Calibration measurements at the National Ignition Facility show a reduction in spectral bandwidth from 87 eV to 48 eV when using the Cu filter, which will be important to improve the spectral resolution of future XRTS measurements that will probe plasmon oscillations in strongly compressed plasmas of low-Z materials at densities of tens of g/cm3. |
| Databáze: | OpenAIRE |
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