High-resolution radial Kα spectra obtained from a multi-keV electron distribution in solid-density titanium foils generated by relativistic laser–matter interaction

Zastrau, U.; Sengebusch, A.; Audebert, P.; Brambrink, E.; Fäustlin, R. R.; Kämpfer, T.; Kroupp, E.; Loetzsch, R.; Maron, Y.; Reinholz, H.; Röpke, G.; Stambulchik, E.; Uschmann, I.; Förster, E.

doi:10.1016/j.hedp.2011.01.003

Cited by 13 publications

(10 citation statements)

References 53 publications

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“…To obtain the radial distribution of the x-ray emission, the Abel deconvolution was applied to the spectra in Fig. 2(b) using the method described in the reference [23]. We assumed that the hot-electron distribution as well as the x-ray emission were radially symmetric on the target plan.…”

Section: Methodsmentioning

confidence: 99%

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Diagnosis of warm dense conditions in foil targets heated by intense femtosecond laser pulses using Kα imaging spectroscopy

et al. 2018

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Warm dense conditions in titanium foils irradiated with intense femtosecond laser pulses are diagnosed using an x-ray imaging spectroscopy technique. The line shapes of radially resolved titanium Kα spectra are measured with a toroidally bent GaAs crystal and an x-ray charge-coupled device. Measured spectra are compared with the K-shell emissions modeled using an atomic kinetics - spectroscopy simulation code. Kα line shapes are strongly affected by warm (5-40 eV) bulk electron temperatures and imply multiple temperature distributions in the targets. The spatial distribution of temperature is dependent on the target thickness, and a thin target shows an advantage to generate uniform warm dense conditions in a large area.

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Section: Methodsmentioning

confidence: 99%

“…Kα emission occurs within the lifetime of fast electrons, which is typically shorter than the hydrodynamic expansion time [21]. Precedent works showed Kα line measurements could serve as a thermometer for the bulk of WDM samples created by high energy lasers [20,[22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Diagnosis of warm dense conditions in foil targets heated by intense femtosecond laser pulses using Kα imaging spectroscopy

et al. 2018

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“…Here, the here-described spectrometer would allow for simultaneous measurements over a wide angular range, which is potentially both more efficient and reliable than recording one emission angle at a time. 29,30 Additionally, the high spectral resolution allows determination of the plasma temperature by fitting the altered Kα line shape with temperature-dependent line shape models. 31 …”

Section: Wider Ranging Applicationsmentioning

confidence: 99%

Bent crystal spectrometer for both frequency and wavenumber resolved x-ray scattering at a seeded free-electron laser

Zastrau

Fletcher

Förster

et al. 2014

Review of Scientific Instruments

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We present a cylindrically curved GaAs x-ray spectrometer with energy resolution ∆E/E = 1.1 • 10 −4 and wave-number resolution of ∆k/k = 3 • 10 −3 , allowing plasmon scattering at the resolution limits of the Linac Coherent Light Source (LCLS) x-ray free-electron laser. It spans scattering wavenumbers of 3.6 to 5.2/ Å in 100 separate bins, with only 0.34% wavenumber blurring. The dispersion of 0.418 eV/13.5 µm agrees with predictions within 1.3%. The reflection homogeneity over the entire wavenumber range was measured and used to normalize the amplitude of scattering spectra. The proposed spectrometer is superior to a mosaic HAPG spectrometer when the energy resolution needs to be comparable to the LCLS seeded bandwidth of 1 eV and a significant range of wavenumbers must be covered in one exposure.

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“…It is the purpose of this paper to investigate the energy content and heating of the laser-irradiated target by means of two different approaches, specifically addressing the recent Zastrau et al experimental data (Zastrau et al, 2010;2012a); see also Zastrau et al (2012b) for additional data. In the first approach, energy content is calculated from the detailed experimental transverse temperature profiles of thin foil titanium (Ti) targets irradiated by a femtosecond high-intensity laser as obtained by Zastrau et al The calculation makes use of specific heats calculated from the average atom model.…”

Section: Introductionmentioning

confidence: 99%

Energy content of target and electron flow in femtosecond laser target interactions

2015

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The heating of the titanium foil in a recent femtosecond laser plasma experiment is investigated theoretically in two different ways. In the first, the energy content and thus the heating efficiency of the central volume of the foil is derived by integrating the transverse temperature profiles obtained in this experiment, using specific heats based on the average atom model. In the second approach target heating by the fast electrons, both by direct energy deposition and by resistive heating is investigated. The latter approach makes use of a specially devised electron flow model which includes a simplified quantitative treatment of multi-refluxing as a crucial component. In all, the calculated results of electron beam heating are consistent with experiment within the limitations of the modeling. Finally, a prediction for the temporal dependence of the Kα pulse from the central volume of the foil based on our electron flow model is given.

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High-resolution radial Kα spectra obtained from a multi-keV electron distribution in solid-density titanium foils generated by relativistic laser–matter interaction

Cited by 13 publications

References 53 publications

Diagnosis of warm dense conditions in foil targets heated by intense femtosecond laser pulses using Kα imaging spectroscopy

Diagnosis of warm dense conditions in foil targets heated by intense femtosecond laser pulses using Kα imaging spectroscopy

Bent crystal spectrometer for both frequency and wavenumber resolved x-ray scattering at a seeded free-electron laser

Energy content of target and electron flow in femtosecond laser target interactions

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