Journal Article

PUBDB-2020-02737

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Time-Resolved XUV Opacity Measurements of Warm Dense Aluminum

Vinko, S. (Corresponding author)Extern* ; Vozda, V.Extern* ; Andreasson, J.Extern* ; Bajt, S.CFEL*DESY* ; Bielecki, J.XFEL.EU* ; Burian, T.Extern* ; Chalupsky, J.Extern* ; Ciricosta, O.Extern* ; Desjarlais, M. P. ; Fleckenstein, H.CFEL*DESY* ; Hajdu, J.Extern* ; Hajkova, V.Extern* ; Hollebon, P.Extern* ; Juha, L.Extern* ; Kasim, M. F. ; McBride, E. E. ; Muehlig, K.Extern* ; Preston, T. R.XFEL.EU* ; Rackstraw, D. S. ; Roling, S.Extern* ; Toleikis, S.DESY* ; Wark, J.Extern* ; Zacharias, H.Extern*

2020
APS College Park, Md.

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Please use a persistent id in citations: doi:10.1103/PhysRevLett.124.225002  doi:10.3204/PUBDB-2020-02737

Abstract: The free-free opacity in plasmas is fundamental to our understanding of energy transport in stellar interiors and for inertial confinement fusion research. However, theoretical predictions in the challenging dense plasma regime are conflicting and there is a dearth of accurate experimental data to allow for direct model validation. Here we present time-resolved transmission measurements in solid-density Al heated by an XUV free-electron laser. We use a novel functional optimization approach to extract the temperature-dependent absorption coefficient directly from an oversampled pool of single-shot measurements, and find a pronounced enhancement of the opacity as the plasma is heated to temperatures of order of the Fermi energy. Plasma heating and opacity enhancement are observed on ultrafast timescales, within the duration of the femtosecond XUV pulse. We attribute further rises in the opacity on ps timescales to melt and the formation of warm dense matter.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. FLASH Wissenschaftlicher Nutzerbetrieb (FS-FLASH-O)
3. FS-Arbeitsgruppe (FS-ML)
4. CFEL-Coherent X-Ray Imaging (FS-CFEL-1)

Research Program(s):

1. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)
2. 6G2 - FLASH (POF3-622) (POF3-622)
3. StUpPD_149_14 - Selective C-C bond cleavage in alkoxides, applicable in lignin valorization (ZUK2-SU-StUpPD_149_14) (ZUK2-SU-StUpPD_149_14)
4. CALIPSO - Coordinated Access to Lightsources to Promote Standards and Optimization (312284) (312284)

Experiment(s):

1. FLASH Beamline BL2 (FLASH)

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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