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Title: Measurements of laser generated soft X-ray emission from irradiated gold foils

Abstract

We measured soft x-ray emission from laser irradiated gold foils at the Omega-60 laser system using the Dante photodiode array. The foils were heated with 2 kJ, 6ns laser pulses and foil thicknesses were varied between 0.5, 1.0, and 2.0 μm. Initial Dante analysis indicates peak emission temperatures of roughly 100 eV and 80 eV for the 0.5 μm and 1.0 μm thick foils, respectively, with little measurable emission from the 2.0 μm foils.

Authors:
 [1];  [2];  [2];  [2];  [1];  [1]; ORCiD logo [1];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Soreq Nuclear Research Center, Yavne (Israel)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1341782
Grant/Contract Number:
NA0002719; NA0002956; NA0001944
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: 21. Topical Conference on High Temperature Plasma Diagnostics, Madison, WI (United States), June 5-9, 2016; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; soft x-rays; gold; Dante

Citation Formats

Davis, J. S., Frank, Y., Raicher, E., Fraenkel, M., Keiter, P. A., Klein, S. R., Drake, R. P., and Shvarts, D. Measurements of laser generated soft X-ray emission from irradiated gold foils. United States: N. p., 2016. Web. doi:10.1063/1.4960816.
Davis, J. S., Frank, Y., Raicher, E., Fraenkel, M., Keiter, P. A., Klein, S. R., Drake, R. P., & Shvarts, D. Measurements of laser generated soft X-ray emission from irradiated gold foils. United States. doi:10.1063/1.4960816.
Davis, J. S., Frank, Y., Raicher, E., Fraenkel, M., Keiter, P. A., Klein, S. R., Drake, R. P., and Shvarts, D. 2016. "Measurements of laser generated soft X-ray emission from irradiated gold foils". United States. doi:10.1063/1.4960816. https://www.osti.gov/servlets/purl/1341782.
@article{osti_1341782,
title = {Measurements of laser generated soft X-ray emission from irradiated gold foils},
author = {Davis, J. S. and Frank, Y. and Raicher, E. and Fraenkel, M. and Keiter, P. A. and Klein, S. R. and Drake, R. P. and Shvarts, D.},
abstractNote = {We measured soft x-ray emission from laser irradiated gold foils at the Omega-60 laser system using the Dante photodiode array. The foils were heated with 2 kJ, 6ns laser pulses and foil thicknesses were varied between 0.5, 1.0, and 2.0 μm. Initial Dante analysis indicates peak emission temperatures of roughly 100 eV and 80 eV for the 0.5 μm and 1.0 μm thick foils, respectively, with little measurable emission from the 2.0 μm foils.},
doi = {10.1063/1.4960816},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = 2016,
month = 8
}

Journal Article:
Free Publicly Available Full Text
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Citation Metrics:
Cited by: 2works
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  • Soft x-ray emission from laser irradiated gold foils was measured at the Omega-60 laser system using the Dante photodiode array. The foils were heated with 2 kJ, 6 ns laser pulses and foil thicknesses were varied between 0.5, 1.0, and 2.0 μm. Initial Dante analysis indicates peak emission temperatures of roughly 100 eV and 80 eV for the 0.5 μm and 1.0 μm thick foils, respectively, with little measurable emission from the 2.0 μm foils.
  • A two-mirror normal-incidence microscope with multilayer coatings was used to image the soft-x-ray emissions from planar foils irradiated by OMEGA laser beams. The bandpass of the multilayer coatings was centered at a wavelength of 48.3 {Angstrom} (257-eV energy) and was 0.5 {Angstrom} wide. Five overlapping OMEGA beams, without beam smoothing, were typically incident on the gold foils. The total energy was 1500 J, and the focused intensity was 6{times}10{sup 13} Wcm{sup {minus}2}. The 5.8{times} magnified images were recorded by a gated framing camera at various times during the 3-ns laser pulse. A pinhole camera imaged the x-ray emission in themore » energy range of {gt}2 keV. On a spatial scale of 10 {mu}m, it was found that the soft-x-ray images at 257 eV were quite uniform and featureless. In contrast, the hard-x-ray images in the energy range of {gt}2 kev were highly nonuniform with numerous features of size 150 {mu}m. {copyright} 1998 Optical Society of America« less
  • Gold M-band x rays with energies above the sulfur K edge of 2.472 keV create sulfur K/sub ..cap alpha../ fluorescence with a quantum efficiency of 8.1%. The sulfur fluorescer was a 600 x 1500-..mu..m rectangle about 1100 ..mu..m from the gold plate. It was 25 ..mu..m of C/sub 6/H/sub 4/S plastic shielded by 50 ..mu..m of beryllium. The absolute brightnesses of both the M-band spectrum and of the fluorescence line were measured by separate spectrographs. The spectrograph measuring the fluorescence did not have a direct line of sight to the hot gold. These measurements were made with 3512-A laser lightmore » irradiating the gold plate for 1 ns over a number of intensities between 2 x 10/sup 14/ and 10/sup 15/ W/cm/sup 2/.« less
  • We present modeling, measurements and analysis that extend our understanding of laser-plasma coupling and x-ray conversion processes to shorter laser wavelengths at kilojoule energies. We have studied the x-ray emission from gold-disk targets irradiated at 0.26-..mu..m wavelength, using 0.5--1.5-kJ, 1-ns full width at half maximum Gaussian pulses at intensities of 1 x 10/sup 14/--2 x 10/sup 15/ W/cm/sup 2/. We interpret measurements of the absolute broadband x-ray spectrum, the time history of sub-keV x-ray emission flux, and the broadband hard-x-ray spectrum. We find negligible hot-electron levels (<10/sup -3/E/sub inc/). We infer increased conversion of incident light to soft x raysmore » (72% +- 15% at 1 x 10/sup 14/ and 38% +- 12% at 2 x 10/sup 15/), compared with longer wavelengths, as predicted. We find good overall agreement between the modeling and the data, but identify some areas that need to be better understood, including certain aspects of the x-ray emission spectrum and the decay rate of the emission pulse.« less
  • A new target configuration is proposed to generate efficient multi-keV x-ray source using multiple thin foils as x-ray emitters. The target was constructed with several layers of thin foils, which were placed with a specific, optimized spacing. The thin foils are burned though one by one by a nanosecond-long laser pulse, which produced a very large, hot, underdense plasma. One-dimensional radiation hydrodynamic simulations show that the emission region and the multi-keV x-ray flux generated by multi-layer thin foil target are similar to that of the low-density gas or foam target, which is currently a bright multi-keV x-ray source generated bymore » laser heating. Detailed analysis of a range of foil thicknesses showed that a layer-thickness of 0.1 μm is thin enough to generate an efficient multi-keV x-ray source. Additionally, this type of target can be easily manufactured, compared with the complex techniques for fabrication of low-density foam targets. Our preliminary experimental results also verified that the size of multi-keV x-ray emission region could be enhanced significantly by using a multi-layer Ti thin foil target.« less