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Title: Soft X-ray emission from laser-irradiated gold foils

Abstract

Here, this paper reports measurements of soft-x-ray emission from gold foils irradiated by 6 ns laser pulses, and analysis and simulations of the observations. These foils can be used as x-ray sources to drive a wide range of experiments. A multichannel, photodiode array measured the time-resolved, soft-x-ray emission. A soft-x-ray framing camera imaged the emission in selected energy bands. Foil thicknesses were from 0.5 to 1.5 μm. The imaging data show that the region emitting soft x-rays grows throughout the laser drive, on both the front and rear surfaces. Analysis of the emitted radiation flux from the rear surface, taking the time-dependent spot size into account, showed that the peak effective temperature of 0.5-μm-thick foils is near 88 eV, while that of 0.75-μm-thick foils is near 78 eV. A Monte Carlo method was used to evaluate the component of the uncertainty in the effective temperature introduced by variations in signal voltages and by uncertainty in the size of the emitting spot. This was found to be near ±2 eV in most cases. Simple theoretical considerations explain the main features of the observations. The Florence code, working with atomic physics from sophisticated models, proved able to reproduce the main features ofmore » the observed spectra with 1D simulations in which the laser energy flux was adjusted on the basis of the observed lateral spreading of energy.« less

Authors:
 [1]; ORCiD logo [1];  [2];  [2];  [1];  [1];  [2];  [3];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Soreq Research Center, Yavne (Israel)
  3. Nuclear Research Center Negev, Beer-Sheva (Israel); Ben-Gurion Univ., Beer-Sheva (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:
1461199
Grant/Contract Number:  
NA0003527
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 7; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Davis, J. S., Drake, R. P., Fraenkel, M., Frank, Y., Keiter, P. A., Klein, S. R., Raicher, E., Shvarts, D., and Trantham, M. R. Soft X-ray emission from laser-irradiated gold foils. United States: N. p., 2018. Web. doi:10.1063/1.5036934.
Davis, J. S., Drake, R. P., Fraenkel, M., Frank, Y., Keiter, P. A., Klein, S. R., Raicher, E., Shvarts, D., & Trantham, M. R. Soft X-ray emission from laser-irradiated gold foils. United States. doi:10.1063/1.5036934.
Davis, J. S., Drake, R. P., Fraenkel, M., Frank, Y., Keiter, P. A., Klein, S. R., Raicher, E., Shvarts, D., and Trantham, M. R. Fri . "Soft X-ray emission from laser-irradiated gold foils". United States. doi:10.1063/1.5036934. https://www.osti.gov/servlets/purl/1461199.
@article{osti_1461199,
title = {Soft X-ray emission from laser-irradiated gold foils},
author = {Davis, J. S. and Drake, R. P. and Fraenkel, M. and Frank, Y. and Keiter, P. A. and Klein, S. R. and Raicher, E. and Shvarts, D. and Trantham, M. R.},
abstractNote = {Here, this paper reports measurements of soft-x-ray emission from gold foils irradiated by 6 ns laser pulses, and analysis and simulations of the observations. These foils can be used as x-ray sources to drive a wide range of experiments. A multichannel, photodiode array measured the time-resolved, soft-x-ray emission. A soft-x-ray framing camera imaged the emission in selected energy bands. Foil thicknesses were from 0.5 to 1.5 μm. The imaging data show that the region emitting soft x-rays grows throughout the laser drive, on both the front and rear surfaces. Analysis of the emitted radiation flux from the rear surface, taking the time-dependent spot size into account, showed that the peak effective temperature of 0.5-μm-thick foils is near 88 eV, while that of 0.75-μm-thick foils is near 78 eV. A Monte Carlo method was used to evaluate the component of the uncertainty in the effective temperature introduced by variations in signal voltages and by uncertainty in the size of the emitting spot. This was found to be near ±2 eV in most cases. Simple theoretical considerations explain the main features of the observations. The Florence code, working with atomic physics from sophisticated models, proved able to reproduce the main features of the observed spectra with 1D simulations in which the laser energy flux was adjusted on the basis of the observed lateral spreading of energy.},
doi = {10.1063/1.5036934},
journal = {Physics of Plasmas},
number = 7,
volume = 25,
place = {United States},
year = {2018},
month = {7}
}

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    Efficient absorption of laser light by nano-porous materials with well-controlled structure
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