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Title: Investigation of high X-ray conversion efficiency Kr filled gas sources at the National Ignition Facility

Abstract

In this work, we report on the performance of high x-ray fluence Kr K-shell sources that are being developed for high energy density experiments. These targets are 4.1 mm in diameter 4.4 mm tall hollow epoxy tubes having a 40 μm thick wall holding 1.5 atm of Kr gas. For these shots, the National Ignition Facility laser delivered a nominally constant total energy of ≈750 kJ of 351 nm (3ω) light at the three power levels [e.g., ≈120 (low), ≈145 (medium), and ≈210 TW (high)]. The Kr K-shell (Ephoton = 8–20 keV) x-ray radiant intensity and radiant energy (kJ/sr) of these sources were found to increase as a function of laser power but began to plateau at the highest laser power. The Kr K-shell radiant energy increased from ≈1 kJ/sr at ≈120 TW to ≈2 kJ/sr at ≈210 TW. Radiation hydrodynamics simulations predict radiant energies to be always higher than these measurements. The increase in K-shell emission is attributed to its strong dependence on the electron temperature. Electron temperature distributions were inferred from measured Heα and Lyα line emission through the use of a genetic algorithm and Scram modeling. The inferred temperatures from the experiment are 20% to 30% highermore » than those predicted from modeling.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Defense Threat Reduction Agency (DTRA)
OSTI Identifier:
1810634
Alternate Identifier(s):
OSTI ID: 1525564
Report Number(s):
LLNL-JRNL-769421
Journal ID: ISSN 1070-664X; 959705; TRN: US2213061
Grant/Contract Number:  
AC52-07NA27344; 10027-1420; 10027-6167
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 6; 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

May, M. J., Kemp, G. E., Colvin, J. D., Liedahl, D. A., Poole, P. L., Thorn, D. B., Widmann, K., Benjamin, R., Barrios, M. A., and Blue, B. E. Investigation of high X-ray conversion efficiency Kr filled gas sources at the National Ignition Facility. United States: N. p., 2019. Web. doi:10.1063/1.5097960.
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May, M. J., Kemp, G. E., Colvin, J. D., Liedahl, D. A., Poole, P. L., Thorn, D. B., Widmann, K., Benjamin, R., Barrios, M. A., & Blue, B. E. Investigation of high X-ray conversion efficiency Kr filled gas sources at the National Ignition Facility. United States. https://doi.org/10.1063/1.5097960
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May, M. J., Kemp, G. E., Colvin, J. D., Liedahl, D. A., Poole, P. L., Thorn, D. B., Widmann, K., Benjamin, R., Barrios, M. A., and Blue, B. E. Fri . "Investigation of high X-ray conversion efficiency Kr filled gas sources at the National Ignition Facility". United States. https://doi.org/10.1063/1.5097960. https://www.osti.gov/servlets/purl/1810634.
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@article{osti_1810634,
title = {Investigation of high X-ray conversion efficiency Kr filled gas sources at the National Ignition Facility},
author = {May, M. J. and Kemp, G. E. and Colvin, J. D. and Liedahl, D. A. and Poole, P. L. and Thorn, D. B. and Widmann, K. and Benjamin, R. and Barrios, M. A. and Blue, B. E.},
abstractNote = {In this work, we report on the performance of high x-ray fluence Kr K-shell sources that are being developed for high energy density experiments. These targets are 4.1 mm in diameter 4.4 mm tall hollow epoxy tubes having a 40 μm thick wall holding 1.5 atm of Kr gas. For these shots, the National Ignition Facility laser delivered a nominally constant total energy of ≈750 kJ of 351 nm (3ω) light at the three power levels [e.g., ≈120 (low), ≈145 (medium), and ≈210 TW (high)]. The Kr K-shell (Ephoton = 8–20 keV) x-ray radiant intensity and radiant energy (kJ/sr) of these sources were found to increase as a function of laser power but began to plateau at the highest laser power. The Kr K-shell radiant energy increased from ≈1 kJ/sr at ≈120 TW to ≈2 kJ/sr at ≈210 TW. Radiation hydrodynamics simulations predict radiant energies to be always higher than these measurements. The increase in K-shell emission is attributed to its strong dependence on the electron temperature. Electron temperature distributions were inferred from measured Heα and Lyα line emission through the use of a genetic algorithm and Scram modeling. The inferred temperatures from the experiment are 20% to 30% higher than those predicted from modeling.},
doi = {10.1063/1.5097960},
journal = {Physics of Plasmas},
number = 6,
volume = 26,
place = {United States},
year = {Fri May 24 00:00:00 EDT 2019},
month = {Fri May 24 00:00:00 EDT 2019}
}
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https://doi.org/10.1063/1.5097960
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