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

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.

doi:10.1063/1.5097960

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

Journal Article · Fri May 24 00:00:00 EDT 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5097960· OSTI ID:1810634

^[1]; Kemp, G. E. ^[1];

^[1]; Liedahl, D. A. ^[1]; Poole, P. L. ^[1]; Thorn, D. B. ^[1];

^[1]; Benjamin, R. ^[1];

^[1]; Blue, B. E. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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 (E_photon = 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.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Defense Threat Reduction Agency (DTRA)

Grant/Contract Number:: AC52-07NA27344; 10027-1420; 10027-6167

OSTI ID:: 1810634

Alternate ID(s):: OSTI ID: 1525564

Report Number(s):: LLNL-JRNL-769421; 959705; TRN: US2213061

Journal Information:: Physics of Plasmas, Vol. 26, Issue 6; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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