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Your search keyword '"Vorberger, J."' showing total 13 results
Start Over Author "Vorberger, J." Journal physics of plasmas
13 results on '"Vorberger, J."'

1. High-pressure chemistry of hydrocarbons relevant to planetary interiors and inertial confinement fusion

Author

Kraus, D., Hartley, N. J, Frydrych, S., Schuster, A. K, Rohatsch, K., Rödel, M., Cowan, T. E, Brown, S., Cunningham, E., van Driel, T., Fletcher, L. B, Galtier, E., Gamboa, E. J, Laso Garcia, A., Gericke, D. O, Granados, E., Heimann, P. A, Lee, H. J, MacDonald, M. J, MacKinnon, A. J, McBride, E. E, Nam, I., Neumayer, P., Pak, A., Pelka, A., Prencipe, I., Ravasio, A., Redmer, R., Saunders, A. M, Schölmerich, M., Schörner, M., Sun, P., Turner, S. J, Zettl, A., Falcone, R. W, Glenzer, S. H, T. Döppner, T., and Vorberger, J.

Published
2018

2. Toward using collective x-ray Thomson scattering to study C–H demixing and hydrogen metallization in warm dense matter conditions

Author

Ranjan, D., primary, Ramakrishna, K., additional, Voigt, K., additional, Humphries, O. S., additional, Heuser, B., additional, Stevenson, M. G., additional, Lütgert, J., additional, He, Z., additional, Qu, C., additional, Schumacher, S., additional, May, P. T., additional, Amouretti, A., additional, Appel, K., additional, Brambrink, E., additional, Cerantola, V., additional, Chekrygina, D., additional, Fletcher, L. B., additional, Göde, S., additional, Harmand, M., additional, Hartley, N. J., additional, Hau-Riege, S. P., additional, Makita, M., additional, Pelka, A., additional, Schuster, A. K., additional, Šmíd, M., additional, Toncian, T., additional, Zhang, M., additional, Preston, T. R., additional, Zastrau, U., additional, Vorberger, J., additional, and Kraus, D., additional

Published
2023
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3. Demonstration of an x-ray Raman spectroscopy setup to study warm dense carbon at the high energy density instrument of European XFEL

Author

Voigt, K., primary, Zhang, M., additional, Ramakrishna, K., additional, Amouretti, A., additional, Appel, K., additional, Brambrink, E., additional, Cerantola, V., additional, Chekrygina, D., additional, Döppner, T., additional, Falcone, R. W., additional, Falk, K., additional, Fletcher, L. B., additional, Gericke, D. O., additional, Göde, S., additional, Harmand, M., additional, Hartley, N. J., additional, Hau-Riege, S. P., additional, Huang, L. G., additional, Humphries, O. S., additional, Lokamani, M., additional, Makita, M., additional, Pelka, A., additional, Prescher, C., additional, Schuster, A. K., additional, Šmíd, M., additional, Toncian, T., additional, Vorberger, J., additional, Zastrau, U., additional, Preston, T. R., additional, and Kraus, D., additional

Published
2021
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4. Ab initio simulation of warm dense matter

Author

Bonitz, M., primary, Dornheim, T., additional, Moldabekov, Zh. A., additional, Zhang, S., additional, Hamann, P., additional, Kählert, H., additional, Filinov, A., additional, Ramakrishna, K., additional, and Vorberger, J., additional

Published
2020
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5. Erratum: “Single-shot measurements of plasmons in compressed diamond with an x-ray laser” [Phys. Plasmas 22, 056319 (2015)]

Author

Gamboa, E. J., primary, Fletcher, L. B., additional, Lee, H. J., additional, Zastrau, U., additional, Galtier, E., additional, MacDonald, M. J., additional, Gauthier, M., additional, Vorberger, J., additional, Gericke, D. O., additional, Granados, E., additional, Hastings, J. B., additional, and Glenzer, S. H., additional

Published
2016
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7. The complex ion structure of warm dense carbon measured by spectrally resolved x-ray scatteringa)

Author

Kraus, D., primary, Vorberger, J., additional, Helfrich, J., additional, Gericke, D. O., additional, Bachmann, B., additional, Bagnoud, V., additional, Barbrel, B., additional, Blažević, A., additional, Carroll, D. C., additional, Cayzac, W., additional, Döppner, T., additional, Fletcher, L. B., additional, Frank, A., additional, Frydrych, S., additional, Gamboa, E. J., additional, Gauthier, M., additional, Göde, S., additional, Granados, E., additional, Gregori, G., additional, Hartley, N. J., additional, Kettle, B., additional, Lee, H. J., additional, Nagler, B., additional, Neumayer, P., additional, Notley, M. M., additional, Ortner, A., additional, Otten, A., additional, Ravasio, A., additional, Riley, D., additional, Roth, F., additional, Schaumann, G., additional, Schumacher, D., additional, Schumaker, W., additional, Siegenthaler, K., additional, Spindloe, C., additional, Wagner, F., additional, Wünsch, K., additional, Glenzer, S. H., additional, Roth, M., additional, and Falcone, R. W., additional

Published
2015
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8. Observations of strong ion-ion correlations in dense plasmas

Author

Ma, T., primary, Fletcher, L., additional, Pak, A., additional, Chapman, D. A., additional, Falcone, R. W., additional, Fortmann, C., additional, Galtier, E., additional, Gericke, D. O., additional, Gregori, G., additional, Hastings, J., additional, Landen, O. L., additional, Le Pape, S., additional, Lee, H. J., additional, Nagler, B., additional, Neumayer, P., additional, Turnbull, D., additional, Vorberger, J., additional, White, T. G., additional, Wünsch, K., additional, Zastrau, U., additional, Glenzer, S. H., additional, and Döppner, T., additional

Published
2014
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11. Simulating x-ray Thomson scattering signals from high-density, millimetre-scale plasmas at the National Ignition Facility.

Author

Chapman, D. A., Kraus, D., Kritcher, A. L., Bachmann, B., Collins, G. W., Falcone, R. W., Gaffney, J. A., Gericke, D. O., Glenzer, S. H., Guymer, T. M., Hawreliak, J. A., Landen, O. L., Le Pape, S., Ma, T., Neumayer, P., Nilsen, J., Pak, A., Redmer, R., Swift, D. C., and Vorberger, J.

Subjects
THOMSON scattering, X-rays, SIGNALS & signaling, HIGH-density plasmas, DATA analysis
Abstract

We have developed a model for analysing x-ray Thomson scattering data from high-density, millimetre- scale inhomogeneous plasmas created during ultra-high pressure implosions at the National Ignition Facility in a spherically convergent geometry. The density weighting of the scattered signal and attenuation of the incident and scattered x-rays throughout the target are included using radial profiles of the density, opacity, ionization state, and temperature provided by radiationhydrodynamics simulations. These simulations show that the scattered signal is strongly weighted toward the bulk of the shocked plasma and the Fermi degenerate material near the ablation front. We show that the scattered signal provides a good representation of the temperature of this highly nonuniform bulk plasma and can be determined to an accuracy of ca. 15% using typical data analysis techniques with simple 0D calculations. On the other hand, the mean ionization of the carbon in the bulk is underestimated. We suggest that this discrepancy is due to the convolution of scattering profiles from different regions of the target. Subsequently, we discuss modifications to the current platform to minimise the impact of inhomogeneities, as well as opacity, and also to enable probing of conditions more strongly weighted toward the compressed core. [ABSTRACT FROM AUTHOR]

Published
2014
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12. Toward using collective x-ray Thomson scattering to study C–H demixing and hydrogen metallization in warm dense matter conditions

Author

D. Ranjan, K. Ramakrishna, K. Voigt, O. S. Humphries, B. Heuser, M. G. Stevenson, J. Lütgert, Z. He, C. Qu, S. Schumacher, P. T. May, A. Amouretti, K. Appel, E. Brambrink, V. Cerantola, D. Chekrygina, L. B. Fletcher, S. Göde, M. Harmand, N. J. Hartley, S. P. Hau-Riege, M. Makita, A. Pelka, A. K. Schuster, M. Šmíd, T. Toncian, M. Zhang, T. R. Preston, U. Zastrau, J. Vorberger, D. Kraus, Ranjan, D, Ramakrishna, K, Voigt, K, Humphries, O, Heuser, B, Stevenson, M, Lütgert, J, He, Z, Qu, C, Schumacher, S, May, P, Amouretti, A, Appel, K, Brambrink, E, Cerantola, V, Chekrygina, D, Fletcher, L, Göde, S, Harmand, M, Hartley, N, Hau-Riege, S, Makita, M, Pelka, A, Schuster, A, Šmíd, M, Toncian, T, Zhang, M, Preston, T, Zastrau, U, Vorberger, J, and Kraus, D

Subjects
XFEL, Thomson scattering, carbon, hydrogen, planetary interior, Condensed Matter Physics
Abstract

The insulator–metal transition in liquid hydrogen is an important phenomenon to understand the interiors of gas giants, such as Jupiter and Saturn, as well as the physical and chemical behavior of materials at high pressures and temperatures. Here, the path toward an experimental approach is detailed based on spectrally resolved x-ray scattering, tailored to observe and characterize hydrogen metallization in dynamically compressed hydrocarbons in the regime of carbon–hydrogen phase separation. With the help of time-dependent density functional theory calculations and scattering spectra from undriven carbon samples collected at the European x-ray Free-Electron Laser Facility (EuXFEL), we demonstrate sufficient data quality for observing C–H demixing and investigating the presence of liquid metallic hydrogen in future experiments using the reprated drive laser systems at EuXFEL.

Published
2023

13. Demonstration of an x-ray Raman spectroscopy setup to study warm dense carbon at the high energy density instrument of European XFEL

Author

T. Toncian, M. Zhang, Clemens Prescher, Dirk O. Gericke, Sebastian Göde, M. Lokamani, D. Chekrygina, M. Makita, Roger Falcone, A. Pelka, Stefan P. Hau-Riege, K. Voigt, T. R. Preston, N. J. Hartley, Marion Harmand, Dominik Kraus, L. G. Huang, Oliver Humphries, Kushal Ramakrishna, Valerio Cerantola, A. K. Schuster, Tilo Döppner, Erik Brambrink, Karen Appel, Ulf Zastrau, Katerina Falk, Luke Fletcher, Michal Smid, A. Amouretti, Jan Vorberger, Voigt, K, Zhang, M, Ramakrishna, K, Amouretti, A, Appel, K, Brambrink, E, Cerantola, V, Chekrygina, D, Döppner, T, Falcone, R, Falk, K, Fletcher, L, Gericke, D, G??de, S, Harmand, M, Hartley, N, Hau-Riege, S, Huang, L, Humphries, O, Lokamani, M, Makita, M, Pelka, A, Prescher, C, Schuster, A, Šmíd, M, Toncian, T, Vorberger, J, Zastrau, U, Preston, T, Kraus, D, Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), and Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Brightness, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], engineering.material, 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, law.invention, symbols.namesake, law, XRS, warm dense carbon, 0103 physical sciences, ddc:530, Spectral resolution, 010306 general physics, [PHYS]Physics [physics], Physics, Spectrometer, XFEL, Diamond, inelastic scattering, Warm dense matter, Condensed Matter Physics, Laser, Computational physics, engineering, symbols, Raman spectroscopy, Annealed pyrolytic graphite
Abstract

International audience; We present a proof-of-principle study demonstrating x-ray Raman Spectroscopy (XRS) from carbon samples at ambient conditions in conjunction with other common diagnostics to study warm dense matter, performed at the high energy density scientific instrument of the European x-ray Free Electron Laser (European XFEL). We obtain sufficient spectral resolution to identify the local structure and chemical bonding of diamond and graphite samples, using highly annealed pyrolytic graphite spectrometers. Due to the high crystal reflectivity and XFEL brightness, we obtain signal strengths that will enable accurate XRS measurements in upcoming pump-probe experiments with a high repetition-rate, where the samples will be pumped with high-power lasers. Molecular dynamics simulations based on density functional theory together with XRS simulations demonstrate the potential of this technique and show predictions for high-energy-density conditions. Our setup allows simultaneous implementation of several different diagnostic methods to reduce ambiguities in the analysis of the experimental results, which, for warm dense matter, often relies on simplifying model assumptions. The promising capabilities demonstrated here provide unprecedented insights into chemical and structural dynamics in warm dense matter states of light elements, including conditions similar to the interiors of planets, low-mass stars, and other celestial bodies.

Published
2021

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