TY  - JOUR
AU  - Ball, Orianna
AU  - Prescher, Clemens
AU  - Appel, Karen
AU  - Baehtz, Carsten
AU  - Baron, M. A.
AU  - Briggs, R.
AU  - Cerantola, V.
AU  - Chantel, J.
AU  - Chariton, S.
AU  - Coleman, A. L.
AU  - Cynn, H.
AU  - Damker, H.
AU  - Dattelbaum, D.
AU  - Dresselhaus-Marais, L. E.
AU  - Eggert, J. H.
AU  - Ehm, L.
AU  - Evans, W. J.
AU  - Fiquet, G.
AU  - Frost, M.
AU  - Glazyrin, K.
AU  - Goncharov, A. F.
AU  - Husband, R. J.
AU  - Hwang, H.
AU  - Jaisle, N.
AU  - Jenei, Zs.
AU  - Kim, J.-Y.
AU  - Lee, Y.
AU  - Liermann, H. P.
AU  - Mainberger, J.
AU  - Makita, M.
AU  - Marquardt, H.
AU  - McBride, E. E.
AU  - McHardy, J. D.
AU  - McMahon, M. I.
AU  - Merkel, S.
AU  - Morard, G.
AU  - O’Bannon, E. F.
AU  - Otzen, C.
AU  - Pace, E. J.
AU  - Pelka, A.
AU  - Pépin, C. M.
AU  - Pigott, J. S.
AU  - Plückthun, C.
AU  - Prakapenka, V. B.
AU  - Redmer, R.
AU  - Speziale, S.
AU  - Spiekermann, G.
AU  - Strohm, C.
AU  - Sturtevant, B. T.
AU  - Talkovski, P.
AU  - Wollenweber, Lennart
AU  - Zastrau, U.
AU  - Mcwilliams, Ryan Stewart
AU  - Konôpková, Z.
TI  - Dynamic optical spectroscopy and pyrometry of static targets under optical and x-ray laser heating at the European XFEL
JO  - Journal of applied physics
VL  - 134
IS  - 5
SN  - 0021-8979
CY  - Melville, NY
PB  - American Inst. of Physics
M1  - PUBDB-2023-05389
SP  - 055901
PY  - 2023
AB  - Experiments accessing extreme conditions at x-ray free electron lasers (XFELs) involve rapidly evolving conditions of temperature. Here,we report time-resolved, direct measurements of temperature using spectral streaked optical pyrometry of x-ray and optical laser-heatedstates at the High Energy Density instrument of the European XFEL. This collection of typical experiments, coupled with numericalmodels, outlines the reliability, precision, and meaning of time dependent temperature measurements using optical emission at XFELsources. Dynamic temperatures above 1500 K are measured continuously from spectrally- and temporally-resolved thermal emission at 450–850 nm, with time resolution down to 10–100 ns for 1–200 μs streak camera windows, using single shot and integrated modes.Targets include zero-pressure foils free-standing in air and in vacuo, and high-pressure samples compressed in diamond anvil cell multi-layer targets. Radiation sources used are 20-fs hard x-ray laser pulses at 17.8 keV, in single pulses or 2.26 MHz pulse trains of up to 30pulses, and 250-ns infrared laser single pulses. A range of further possibilities for optical measurements of visible light in x-ray laserexperiments using streak optical spectroscopy are also explored, including for the study of x-ray induced optical fluorescence, whichoften appears as background in thermal radiation measurements. We establish several scenarios where combined emissions from multiplesources are observed and discuss their interpretation. Challenges posed by using x-ray lasers as non-invasive probes of the sample stateare addressed.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001042073600001
DO  - DOI:10.1063/5.0142196
UR  - https://bib-pubdb1.desy.de/record/593315
ER  -