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1. An approach for the measurement of the bulk temperature of single crystal diamond using an X-ray free electron laser

Author

Descamps, A., Ofori-Okai, B. K., Appel, K., Cerantola, V., Comley, A., Eggert, J. H., Fletcher, L. B., Gericke, D. O., Göde, S., Humphries, O., Karnbach, O., Lazicki, A., Loetzsch, R., McGonegle, D., Palmer, C. A. J., Plueckthun, C., Preston, T. R., Redmer, R., Senesky, D. G., Strohm, C., Uschmann, I., White, T. G., Wollenweber, L., Monaco, G., Wark, J. S., Hastings, J. B., Zastrau, U., Gregori, G., Glenzer, S. H., and McBride, E. E.

Published
2020
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2. Molecular dynamics simulations of inelastic x-ray scattering from shocked copper.

Author

Karnbach, O., Heighway, P. G., McGonegle, D., Rudd, R. E., Gregori, G., and Wark, J. S.

Subjects
*X-ray scattering, *INELASTIC scattering, *QUASI-elastic scattering, *MOLECULAR dynamics, *DOPPLER effect, *FREE electron lasers, *BRILLOUIN zones, *YIELD strength (Engineering)
Abstract

By taking the spatial and temporal Fourier transforms of the coordinates of the atoms in molecular dynamics simulations conducted using an embedded-atom-method potential, we calculate the inelastic scattering of x rays from copper single crystals shocked along [001] to pressures of up to 70 GPa. Above the Hugoniot elastic limit, we find that the copious stacking faults generated at the shock front introduce strong quasi-elastic scattering (QES) that competes with the inelastic scattering signal, which remains discernible within the first Brillouin zone; for specific directions in reciprocal space outside the first zone, the QES dominates the inelastic signal overwhelmingly. The synthetic scattering spectra we generate from our Fourier transforms suggest that energy resolutions of order 10 meV would be required to distinguish inelastic from quasi-elastic scattering within the first Brillouin zone of shock-loaded copper. We further note that high-resolution inelastic scattering also affords the possibility of directly measuring particle velocities via the Doppler shift. These simulations are of relevance to future planned inelastic scattering experiments at x-ray Free Electron Laser facilities. [ABSTRACT FROM AUTHOR]

Published
2021
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3. An approach for the measurement of the bulk temperature of single crystal diamond using an X-ray Free Electron Laser

Author

Descamps, Adrien, primary, Ofori-Okai, B., additional, Appel, K., additional, Cerantola, V., additional, Comley, A., additional, Eggert, J., additional, Fletcher, L., additional, Gericke, D., additional, Goede, S., additional, Humphries, O., additional, Karnbach, O., additional, Lazicki, A., additional, Loetzsch, R., additional, McGonegle, D., additional, Palmer, C., additional, Plueckthun, C., additional, Preston, T., additional, Redmer, R., additional, Senesky, D., additional, Strohm, C., additional, Uschmann, I., additional, White, T., additional, Wollenweber, L., additional, Monaco, G., additional, Wark, J., additional, Hastings, J., additional, Zastrau, U., additional, Gregori, G., additional, Glenzer, S., additional, and McBride, Emma, additional

Published
2020
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4. X-ray Thomson scattering as dynamic temperature and microstructure diagnostic

Author

Karnbach, O, Norreys, P, McMahon, M, Wark, J, and Gregori, G

Subjects
Physics, X-ray diffraction imaging, Molecular dynamics, Fusion
Abstract

Whilst the field of High Energy Density physics spans a history of more than a century, it lacks a reliable dynamic temperature diagnostic. This work presents computational and experimental work on developing such technique based on the principle of detailed balance. In molecular dynamics simulations, monocrystalline copper is shocked along [001] to pressures ranging between ambient and 70 GPa, and its synthetic elastic and inelastic diffraction signal is computed via the spatial and temporal Fourier transforms of the atomic coordinates. In the plastic regime beyond the Hugoniot elastic limit, the crystals slip faults and stacking faults arise, which cause certain Bragg spots to link up in reciprocal space. The compression facilitates the detection of the inelastic phonon modes through pressure hardening by increasing their spacing in energy space, yet the quasi-elastic signal linked to the stacking faults can dominate the spectra outside of the first Brillouin zone. Whilst these temperature measurements highly benefit from increased resolution, it is proposed that the shock compression setups can also determine a Doppler-induced energy shift on the order of meV, which could be used as a direct particle velocity diagnostic. As part of a collaboration in the European XFEL experiment p2191, the ambient and resistively elevated temperatures of monocrystalline diamond are determined. In order to expand this technique into the field of dynamic compression, more results of experiment p2191 and work of p2656 presented here recorded spectra for polycrystalline copper, cobalt, and nickel samples. Whilst no temperature could be determined, the photon levels for a seeded XFEL sufficed to generate high-resolution spectra of inelastic scattering that exhibit varying asymmetry, indicating the presence of microstructure-related quasi-elastic scattering. Whilst predictions about the inelastic signal strength through a photometrics code could be verified, diffraction data remained inconclusive due to poor grain statistics in the polycrystalline targets.

Published
2022

5. Erratum: High-resolution inelastic x-ray scattering at the high energy density scientific instrument at the European X-Ray Free-Electron Laser (Review of Scientific Instruments (2021) 92 (013101) DOI: 10.1063/5.0022886)

Author

Wollenweber L., Wollenweber, L, Preston, T, Descamps, A, Cerantola, V, Comley, A, Eggert, J, Fletcher, L, Geloni, G, Gericke, D, Glenzer, S, Göde, S, Hastings, J, Humphries, O, Jenei, A, Karnbach, O, Konopkova, Z, Loetzsch, R, Marx-Glowna, B, Mcbride, E, Mcgonegle, D, Monaco, G, Ofori-Okai, B, Palmer, C, Plückthun, C, Redmer, R, Strohm, C, Thorpe, I, Tschentscher, T, Uschmann, I, Wark, J, White, T, Appel, K, Gregori, G, Zastrau, U, Wollenweber L., Preston T. R., Descamps A., Cerantola V., Comley A., Eggert J. H., Fletcher L. B., Geloni G., Gericke D. O., Glenzer S. H., Göde S., Hastings J., Humphries O. S., Jenei A., Karnbach O., Konopkova Z., Loetzsch R., Marx-Glowna B., Mcbride E. E., Mcgonegle D., Monaco G., Ofori-Okai B. K., Palmer C. A. J., Plückthun C., Redmer R., Strohm C., Thorpe I., Tschentscher T., Uschmann I., Wark J. S., White T. G., Appel K., Gregori G., Zastrau U., Wollenweber L., Wollenweber, L, Preston, T, Descamps, A, Cerantola, V, Comley, A, Eggert, J, Fletcher, L, Geloni, G, Gericke, D, Glenzer, S, Göde, S, Hastings, J, Humphries, O, Jenei, A, Karnbach, O, Konopkova, Z, Loetzsch, R, Marx-Glowna, B, Mcbride, E, Mcgonegle, D, Monaco, G, Ofori-Okai, B, Palmer, C, Plückthun, C, Redmer, R, Strohm, C, Thorpe, I, Tschentscher, T, Uschmann, I, Wark, J, White, T, Appel, K, Gregori, G, Zastrau, U, Wollenweber L., Preston T. R., Descamps A., Cerantola V., Comley A., Eggert J. H., Fletcher L. B., Geloni G., Gericke D. O., Glenzer S. H., Göde S., Hastings J., Humphries O. S., Jenei A., Karnbach O., Konopkova Z., Loetzsch R., Marx-Glowna B., Mcbride E. E., Mcgonegle D., Monaco G., Ofori-Okai B. K., Palmer C. A. J., Plückthun C., Redmer R., Strohm C., Thorpe I., Tschentscher T., Uschmann I., Wark J. S., White T. G., Appel K., Gregori G., and Zastrau U.

Published
2021

6. High-resolution inelastic x-ray scattering at the high energy density scientific instrument at the European X-Ray Free-Electron Laser

Author

Wollenweber, L, Preston, T, Descamps, A, Cerantola, V, Comley, A, Eggert, J, Fletcher, L, Geloni, G, Gericke, D, Glenzer, S, G??de, S, Hastings, J, Humphries, O, Jenei, A, Karnbach, O, Konopkova, Z, Loetzsch, R, Marx-Glowna, B, Mcbride, E, Mcgonegle, D, Monaco, G, Ofori-Okai, B, Palmer, C, Pl??ckthun, C, Redmer, R, Strohm, C, Thorpe, I, Tschentscher, T, Uschmann, I, Wark, J, White, T, Appel, K, Gregori, G, Zastrau, U, L. Wollenweber, T. R. Preston, A. Descamps, V. Cerantola, A. Comley, J. H. Eggert, L. B. Fletcher, G. Geloni, D. O. Gericke, S. H. Glenzer, S. G??de, J. Hastings, O. S. Humphries, A. Jenei, O. Karnbach, Z. Konopkova, R. Loetzsch, B. Marx-Glowna, E. E. McBride, D. McGonegle, G. Monaco, B. K. Ofori-Okai, C. A. J. Palmer, C. Pl??ckthun, R. Redmer, C. Strohm, I. Thorpe, T. Tschentscher, I. Uschmann, J. S. Wark, T. G. White, K. Appel, G. Gregori, U. Zastrau, Wollenweber, L, Preston, T, Descamps, A, Cerantola, V, Comley, A, Eggert, J, Fletcher, L, Geloni, G, Gericke, D, Glenzer, S, G??de, S, Hastings, J, Humphries, O, Jenei, A, Karnbach, O, Konopkova, Z, Loetzsch, R, Marx-Glowna, B, Mcbride, E, Mcgonegle, D, Monaco, G, Ofori-Okai, B, Palmer, C, Pl??ckthun, C, Redmer, R, Strohm, C, Thorpe, I, Tschentscher, T, Uschmann, I, Wark, J, White, T, Appel, K, Gregori, G, Zastrau, U, L. Wollenweber, T. R. Preston, A. Descamps, V. Cerantola, A. Comley, J. H. Eggert, L. B. Fletcher, G. Geloni, D. O. Gericke, S. H. Glenzer, S. G??de, J. Hastings, O. S. Humphries, A. Jenei, O. Karnbach, Z. Konopkova, R. Loetzsch, B. Marx-Glowna, E. E. McBride, D. McGonegle, G. Monaco, B. K. Ofori-Okai, C. A. J. Palmer, C. Pl??ckthun, R. Redmer, C. Strohm, I. Thorpe, T. Tschentscher, I. Uschmann, J. S. Wark, T. G. White, K. Appel, G. Gregori, and U. Zastrau

Abstract

We introduce a setup to measure high-resolution inelastic x-ray scattering at the High Energy Density scientific instrument at the European X-Ray Free-Electron Laser (XFEL). The setup uses the Si (533) reflection in a channel-cut monochromator and three spherical diced analyzer crystals in near-backscattering geometry to reach a high spectral resolution. An energy resolution of 44 meV is demonstrated for the experimental setup, close to the theoretically achievable minimum resolution. The analyzer crystals and detector are mounted on a curved-rail system, allowing quick and reliable changes in scattering angle without breaking vacuum. The entire setup is designed for operation at 10 Hz, the same repetition rate as the high-power lasers available at the instrument and the fundamental repetition rate of the European XFEL. Among other measurements, it is envisioned that this setup will allow studies of the dynamics of highly transient laser generated states of matter.

Published
2021

7. Publisher’s Note: “High-resolution inelastic x-ray scattering at the high energy density scientific instrument at the European X-Ray Free-Electron Laser” [Rev. Sci. Instrum. 92, 013101 (2021)]

Author

Wollenweber, L., primary, Preston, T. R., additional, Descamps, A., additional, Cerantola, V., additional, Comley, A., additional, Eggert, J. H., additional, Fletcher, L. B., additional, Geloni, G., additional, Gericke, D. O., additional, Glenzer, S. H., additional, Göde, S., additional, Hastings, J., additional, Humphries, O. S., additional, Jenei, A., additional, Karnbach, O., additional, Konopkova, Z., additional, Loetzsch, R., additional, Marx-Glowna, B., additional, McBride, E. E., additional, McGonegle, D., additional, Monaco, G., additional, Ofori-Okai, B. K., additional, Palmer, C. A. J., additional, Plückthun, C., additional, Redmer, R., additional, Strohm, C., additional, Thorpe, I., additional, Tschentscher, T., additional, Uschmann, I., additional, Wark, J. S., additional, White, T. G., additional, Appel, K., additional, Gregori, G., additional, and Zastrau, U., additional

Published
2021
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8. An approach for the measurement of the bulk temperature of single crystal diamond using an X-ray free electron laser

Author

Descamps, A, Ofori-Okai, B, Appel, K, Cerantola, V, Comley, A, Eggert, J, Fletcher, L, Gericke, D, Göde, S, Humphries, O, Karnbach, O, Lazicki, A, Loetzsch, R, Mcgonegle, D, Palmer, C, Plueckthun, C, Preston, T, Redmer, R, Senesky, D, Strohm, C, Uschmann, I, White, T, Wollenweber, L, Monaco, G, Wark, J, Hastings, J, Zastrau, U, Gregori, G, Glenzer, S, Mcbride, E, Ofori-Okai, BK, Eggert, JH, Fletcher, LB, Gericke, DO, McGonegle, D, Palmer, CAJ, Preston, TR, Senesky, DG, White, T G, Wark, JS, Hastings, JB, Glenzer, SH, McBride, EE, Descamps, A, Ofori-Okai, B, Appel, K, Cerantola, V, Comley, A, Eggert, J, Fletcher, L, Gericke, D, Göde, S, Humphries, O, Karnbach, O, Lazicki, A, Loetzsch, R, Mcgonegle, D, Palmer, C, Plueckthun, C, Preston, T, Redmer, R, Senesky, D, Strohm, C, Uschmann, I, White, T, Wollenweber, L, Monaco, G, Wark, J, Hastings, J, Zastrau, U, Gregori, G, Glenzer, S, Mcbride, E, Ofori-Okai, BK, Eggert, JH, Fletcher, LB, Gericke, DO, McGonegle, D, Palmer, CAJ, Preston, TR, Senesky, DG, White, T G, Wark, JS, Hastings, JB, Glenzer, SH, and McBride, EE

Abstract

We present a method to determine the bulk temperature of a single crystal diamond sample at an X-Ray free electron laser using inelastic X-ray scattering. The experiment was performed at the high energy density instrument at the European XFEL GmbH, Germany. The technique, based on inelastic X-ray scattering and the principle of detailed balance, was demonstrated to give accurate temperature measurements, within 8 % for both room temperature diamond and heated diamond to 500 K. Here, the temperature was increased in a controlled way using a resistive heater to test theoretical predictions of the scaling of the signal with temperature. The method was tested by validating the energy of the phonon modes with previous measurements made at room temperature using inelastic X-ray scattering and neutron scattering techniques. This technique could be used to determine the bulk temperature in transient systems with a temporal resolution of 50 fs and for which accurate measurements of thermodynamic properties are vital to build accurate equation of state and transport models.

Published
2020

9. High-resolution inelastic x-ray scattering at the high energy density scientific instrument at the European X-Ray Free-Electron Laser

Author

Wollenweber, L., primary, Preston, T. R., additional, Descamps, A., additional, Cerantola, V., additional, Comley, A., additional, Eggert, J. H., additional, Fletcher, L. B., additional, Geloni, G., additional, Gericke, D. O., additional, Glenzer, S. H., additional, Göde, S., additional, Hastings, J., additional, Humphries, O. S., additional, Jenei, A., additional, Karnbach, O., additional, Konopkova, Z., additional, Loetzsch, R., additional, Marx-Glowna, B., additional, McBride, E. E., additional, McGonegle, D., additional, Monaco, G., additional, Ofori-Okai, B. K., additional, Palmer, C. A. J., additional, Plückthun, C., additional, Redmer, R., additional, Strohm, C., additional, Thorpe, I., additional, Tschentscher, T., additional, Uschmann, I., additional, Wark, J. S., additional, White, T. G., additional, Appel, K., additional, Gregori, G., additional, and Zastrau, U., additional

Published
2021
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10. Design and performance characterisation of the HAPG von Hámos Spectrometer at the High Energy Density Instrument of the European XFEL

Author

Preston, T.R., primary, Göde, S., additional, Schwinkendorf, J.-P., additional, Appel, K., additional, Brambrink, E., additional, Cerantola, V., additional, Höppner, H., additional, Makita, M., additional, Pelka, A., additional, Prescher, C., additional, Sukharnikov, K., additional, Schmidt, A., additional, Thorpe, I., additional, Toncian, T., additional, Amouretti, A., additional, Chekrygina, D., additional, Falcone, R.W., additional, Falk, K., additional, Fletcher, L.B., additional, Galtier, E., additional, Harmand, M., additional, Hartley, N.J., additional, Hau-Riege, S.P., additional, Heimann, P., additional, Huang, L.G., additional, Humphries, O.S., additional, Karnbach, O., additional, Kraus, D., additional, Lee, H.J., additional, Nagler, B., additional, Ren, S., additional, Schuster, A.K., additional, Smid, M., additional, Voigt, K., additional, Zhang, M., additional, and Zastrau, U., additional

Published
2020
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12. High-resolution inelastic x-ray scattering at the high energy density scientific instrument at the European X-Ray Free-Electron Laser

Author

C. Plückthun, Sebastian Göde, Karen Appel, Benjamin K. Ofori-Okai, C. Strohm, Ulf Zastrau, Adrien Descamps, Andrew Comley, Gianluca Gregori, Ingo Uschmann, O. Karnbach, Charlotte Palmer, Lennart Wollenweber, Oliver Humphries, Ronald Redmer, David McGonegle, Justin Wark, Thomas G. White, Luke Fletcher, Jerome B. Hastings, A. Jenei, G. Geloni, Giulio Monaco, Berit Marx-Glowna, Zuzana Konôpková, Jon Eggert, R. Loetzsch, Thomas Tschentscher, Valerio Cerantola, S. H. Glenzer, Dirk O. Gericke, T. R. Preston, Emma McBride, I. Thorpe, Wollenweber, L, Preston, T, Descamps, A, Cerantola, V, Comley, A, Eggert, J, Fletcher, L, Geloni, G, Gericke, D, Glenzer, S, G??de, S, Hastings, J, Humphries, O, Jenei, A, Karnbach, O, Konopkova, Z, Loetzsch, R, Marx-Glowna, B, Mcbride, E, Mcgonegle, D, Monaco, G, Ofori-Okai, B, Palmer, C, Pl??ckthun, C, Redmer, R, Strohm, C, Thorpe, I, Tschentscher, T, Uschmann, I, Wark, J, White, T, Appel, K, Gregori, G, and Zastrau, U

Subjects
Spectrum analyzer, Materials science, Inelastic scattering, 01 natural sciences, monochromator, 010305 fluids & plasmas, law.invention, Optics, law, 0103 physical sciences, Spectral resolution, Instrumentation, Monochromator, 010302 applied physics, business.industry, Scattering, XFEL, Resolution (electron density), Free-electron laser, Laser, ddc:620, business, IXS
Abstract

Review of scientific instruments 92(1), 013101 (2021). doi:10.1063/5.0022886, We introduce a setup to measure high-resolution inelastic x-ray scattering at the High Energy Density scientific instrument at the European X-Ray Free-Electron Laser (XFEL). The setup uses the Si (533) reflection in a channel-cut monochromator and three spherical diced analyzer crystals in near-backscattering geometry to reach a high spectral resolution. An energy resolution of 44 meV is demonstrated for the experimental setup, close to the theoretically achievable minimum resolution. The analyzer crystals and detector are mounted on a curved-rail system, allowing quick and reliable changes in scattering angle without breaking vacuum. The entire setup is designed for operation at 10 Hz, the same repetition rate as the high-power lasers available at the instrument and the fundamental repetition rate of the European XFEL. Among other measurements, it is envisioned that this setup will allow studies of the dynamics of highly transient laser generated states of matter., Published by American Institute of Physics, [S.l.]

Published
2021

13. An approach for the measurement of the bulk temperature of single crystal diamond using an X-ray free electron laser

Author

Charlotte Palmer, Luke Fletcher, Giulio Monaco, Siegfried Glenzer, Thomas G. White, C. Plueckthun, Ingo Uschmann, David McGonegle, C. Strohm, Karen Appel, Gianluca Gregori, Sebastian Göde, Jerome B. Hastings, Benjamin K. Ofori-Okai, Ulf Zastrau, Justin Wark, Debbie G. Senesky, Adrien Descamps, O. Karnbach, Oliver Humphries, Jon Eggert, R. Loetzsch, Emma McBride, Amy Lazicki, Valerio Cerantola, Lennart Wollenweber, Dirk O. Gericke, T. R. Preston, Ronald Redmer, Andrew Comley, Descamps, A, Ofori-Okai, B, Appel, K, Cerantola, V, Comley, A, Eggert, J, Fletcher, L, Gericke, D, Göde, S, Humphries, O, Karnbach, O, Lazicki, A, Loetzsch, R, Mcgonegle, D, Palmer, C, Plueckthun, C, Preston, T, Redmer, R, Senesky, D, Strohm, C, Uschmann, I, White, T, Wollenweber, L, Monaco, G, Wark, J, Hastings, J, Zastrau, U, Gregori, G, Glenzer, S, and Mcbride, E

Subjects
0301 basic medicine, Equation of state, Materials science, Phonon, x-ray heating, Bulk temperature, lcsh:Medicine, Neutron scattering, engineering.material, Temperature measurement, Article, Techniques and instrumentation, 03 medical and health sciences, 0302 clinical medicine, diamond, Condensed-matter physics, lcsh:Science, General, Multidisciplinary, Scattering, XFEL, Physics, lcsh:R, Diamond, Detailed balance, 030104 developmental biology, engineering, lcsh:Q, Atomic physics, ddc:600, 030217 neurology & neurosurgery, IXS
Abstract

Scientific reports 10(1), 14564 (2020). doi:10.1038/s41598-020-71350-x, Published by Macmillan Publishers Limited, part of Springer Nature, [London]

Published
2020

14. Design and performance characterisation of the HAPG von Hámos Spectrometer at the High Energy Density Instrument of the European XFEL

Author

Bob Nagler, Katerina Falk, Dominik Kraus, I. Thorpe, Luke Fletcher, P.A. Heimann, M. Zhang, K. Sukharnikov, Michal Smid, T. R. Preston, A. Pelka, J. P. Schwinkendorf, Roger Falcone, O. Karnbach, A. Amouretti, S. Ren, Valerio Cerantola, Marion Harmand, N. J. Hartley, T. Toncian, L. G. Huang, A. Schmidt, Hauke Höppner, Clemens Prescher, Oliver Humphries, Sebastian Göde, D. Chekrygina, H. J. Lee, A. K. Schuster, Erik Brambrink, Eric Galtier, M. Makita, K. Voigt, Karen Appel, Ulf Zastrau, Stefan P. Hau-Riege, Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Preston, T, Goede, S, Schwinkendorf, J, Appel, K, Brambrink, E, Cerantola, V, Hoeppner, H, Makita, M, Pelka, A, Prescher, C, Sukharnikov, K, Schmidt, A, Thorpe, I, Toncian, T, Amouretti, A, Chekrygina, D, Falcone, R, Falk, K, Fletcher, L, Galtier, E, Harmand, M, Hartley, N, Hau-Riege, S, Heimann, P, Huang, L, Humphries, O, Karnbach, O, Kraus, D, Lee, H, Nagler, B, Ren, S, Schuster, A, Smid, M, Voigt, K, Zhang, M, and Zastrau, U

Subjects
X-ray detector, [PHYS]Physics [physics], Materials science, Spectrometer, business.industry, [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph], 01 natural sciences, 010305 fluids & plasmas, Optics, 0103 physical sciences, spectroscopy and imaging, Energy density, Plasma Diagnostics - interferometry, ddc:610, 010306 general physics, business, Instrumentation, Mathematical Physics, ComputingMilieux_MISCELLANEOUS
Abstract

Journal of Instrumentation 15(11), P11033 (2020). doi:10.1088/1748-0221/15/11/P11033, The von Hámos spectrometer setup at the HED instrument of the European XFEL is described in detail. The spectrometer is designed to be operated primarily between 5 and 15 keV to complement the operating photon energy range of the HED instrument. Four Highly Annealed Pyrolitic Graphite (HAPG) crystals are characterised with thicknesses of 40 μm or 100 μm and radius-of-curvature 50 mm or 80 mm, in conjunction with either an ePix100 or Jungfrau detector. The achieved resolution with the 50 mm crystals, operated between 6.5 and 9 keV, matches that reported previously: ~8 eV for a thickness of 40 μm, whereas, with an 80 mm crystal of thickness 40 μm, the resolution exceeds that expected. Namely, a resolution of 2 eV is demonstrated between 5–6 keV implying a resolving power of 2800. Therefore, we posit that flatter HAPG crystals, with their high reflectivity and improved resolving power, are a powerful tool for hard x-ray scattering and emission experiments allowing unprecedented measurements of collective scattering in a single shot., Published by Inst. of Physics, London

Published
2020
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15. Investigating mechanisms of state localization in highly ionized dense plasmas.

Author

Gawne T, Campbell T, Forte A, Hollebon P, Perez-Callejo G, Humphries OS, Karnbach O, Kasim MF, Preston TR, Lee HJ, Miscampbell A, van den Berg QY, Nagler B, Ren S, Royle RB, Wark JS, and Vinko SM

Abstract

We present experimental observations of K_{β} emission from highly charged Mg ions at solid density, driven by intense x rays from a free electron laser. The presence of K_{β} emission indicates the n=3 atomic shell is relocalized for high charge states, providing an upper constraint on the depression of the ionization potential. We explore the process of state relocalization in dense plasmas from first principles using finite-temperature density functional theory alongside a wave-function localization metric, and find excellent agreement with experimental results.

Published
2023
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16. Light phase detection with on-chip petahertz electronic networks.

Author

Yang Y, Turchetti M, Vasireddy P, Putnam WP, Karnbach O, Nardi A, Kärtner FX, Berggren KK, and Keathley PD

Abstract

Ultrafast, high-intensity light-matter interactions lead to optical-field-driven photocurrents with an attosecond-level temporal response. These photocurrents can be used to detect the carrier-envelope-phase (CEP) of short optical pulses, and enable optical-frequency, petahertz (PHz) electronics for high-speed information processing. Despite recent reports on optical-field-driven photocurrents in various nanoscale solid-state materials, little has been done in examining the large-scale electronic integration of these devices to improve their functionality and compactness. In this work, we demonstrate enhanced, on-chip CEP detection via optical-field-driven photocurrents in a monolithic array of electrically-connected plasmonic bow-tie nanoantennas that are contained within an area of hundreds of square microns. The technique is scalable and could potentially be used for shot-to-shot CEP tagging applications requiring orders-of-magnitude less pulse energy compared to alternative ionization-based techniques. Our results open avenues for compact time-domain, on-chip CEP detection, and inform the development of integrated circuits for PHz electronics as well as integrated platforms for attosecond and strong-field science.

Published
2020
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