Demonstration of a 13-keV Kr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>-shell x-ray source at the National Ignition Facility

Fournier, K. B.; May, Mark; Colvin, J. D.; Barrios, M. A.; Patterson, J. R.; Regan, S. P.

doi:10.1103/physreve.88.033104

Cited by 26 publications

(6 citation statements)

References 26 publications

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“…The shaded areas indicate a fixed 615% uncertainty about the experimental value 26 and simulated profiles are shown as solid lines. In good agreement with the Dante data, 13 the spatially integrated simulated 0-20 keV XRCE is տ53% and the Kr K-shell (8-20 keV) XRCE is 3.5%. Shown in Fig.…”

Section: B Benchmarking With Kr Datasupporting

confidence: 81%

“…Following the previously described prescriptions of Back et al 10 and Fournier et al 13 for estimating K and L-shell x-ray emission, we would expect the emitted boundbound x-ray power to scale like Eq. (2):…”

Section: A Laser Energy Deposition and Line Radiation Efficiencymentioning

confidence: 96%

“…As there are still many modeling uncertainties and unknowns in this high-energy-density (HED) physics regime-including, but not limited to, electron thermal transport models and the level of completeness required for accurate atomic-kinetics calculations-we first benchmarked the HYDRA model against the relatively simple K-shell emission from Kr data taken on the NIF (shot N120805-001-999). 13 A. Kr target and laser geometry Shown in Fig. 1 is a typical schematic of the targets of interest: thin-walled (40 lm thick), 4 mm long, 4.1 mm inner-diameter, epoxy (C 40 H 51 N 2 O 7 , q ¼ 1.185 g/cm 3 ) pipes designed to contain the pressurized gas and yet transmit x rays with energies >3 keV.…”

Section: Simulationsmentioning

confidence: 99%

“…With the $10 keV electron temperatures achievable on the National Ignition Facility, increasingly efficient տ10 keV x-ray sources are now within reach. 13 For this study, we focus on optimizing 3-5 keV x-ray emission for which we chose the photon-energy-matched Ar K-shell and Ag L-shell. The dependence of XRCE on atomic number into fixed energy bands has been studied for decades [14][15][16] but (to our knowledge) not at such high x-ray energies or electron temperatures made accessible by NIF.…”

Section: Introductionmentioning

confidence: 99%

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Simulation study of 3–5 keV x-ray conversion efficiency from Ar K-shell vs. Ag L-shell targets on the National Ignition Facility laser

et al. 2015

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Tailored, high-flux, multi-keV x-ray sources are desirable for studying x-ray interactions with matter for various civilian, space and military applications. For this study, we focus on designing an efficient laser-driven non-local thermodynamic equilibrium 3-5 keV x-ray source from photonenergy-matched Ar K-shell and Ag L-shell targets at sub-critical densities ($n c /10) to ensure supersonic, volumetric laser heating with minimal losses to kinetic energy, thermal x rays and laser-plasma instabilities. Using HYDRA, a multi-dimensional, arbitrary Lagrangian-Eulerian, radiation-hydrodynamics code, we performed a parameter study by varying initial target density and laser parameters for each material using conditions readily achievable on the National Ignition Facility (NIF) laser. We employ a model, benchmarked against Kr data collected on the NIF, that uses flux-limited Lee-More thermal conductivity and multi-group implicit Monte-Carlo photonics with non-local thermodynamic equilibrium, detailed super-configuration accounting opacities from CRETIN, an atomic-kinetics code. While the highest power laser configurations produced the largest x-ray yields, we report that the peak simulated laser to 3-5 keV x-ray conversion efficiencies of 17.7% and 36.4% for Ar and Ag, respectively, occurred at lower powers between $100-150 TW. For identical initial target densities and laser illumination, the Ag L-shell is observed to have տ10Â higher emissivity per ion per deposited laser energy than the Ar K-shell. Although such low-density Ag targets have not yet been demonstrated, simulations of targets fabricated using atomic layer deposition of Ag on silica aerogels ($20% by atomic fraction) suggest similar performance to atomically pure metal foams and that either fabrication technique may be worth pursuing for an efficient 3-5 keV x-ray source on NIF. V C 2015 AIP Publishing LLC.

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Section: B Benchmarking With Kr Datasupporting

confidence: 81%

Section: A Laser Energy Deposition and Line Radiation Efficiencymentioning

confidence: 96%

Section: Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation study of 3–5 keV x-ray conversion efficiency from Ar K-shell vs. Ag L-shell targets on the National Ignition Facility laser

et al. 2015

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“…3 More recently, a 13 keV Kr K-a x-ray source from gas pipes has been produced with a 3% conversion efficiency. 4 However, the current x-ray sources produced using the NIF are isotropic (meaning that most of the photons are not intercepted by the target plasma) and not easily tunable. To produce backlighters with both higher photon yield and energy and short pulse duration, the laser facilities listed above are also equipped with picosecond, petawatt-class systems such as the Advanced Radiographic Capability at LLNL, OMEGA-EP at LLE, the Petawatt Aquitaine Laser (PETAL) at CEA (France), the Orion Laser at AWE (U.K.), and the LFEX laser at the University of Osaka (Japan).…”

Section: Introductionmentioning

confidence: 99%

Betatron x-ray radiation from laser-plasma accelerators driven by femtosecond and picosecond laser systems

et al. 2018

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J. et al (2018) Betatron x-ray radiation from laser-plasma accelerators driven by femtosecond and picosecond laser systems Physics of Plasmas, 25(5) http://dx.A comparative experimental study of betatron x-ray radiation from laser wakefield acceleration in the blowout and self-modulated regimes is presented. Our experiments use picosecond duration laser pulses up to 150 J (self-modulated regime) and 60 fs duration laser pulses up to 10 J (blowout regime), for plasmas with electronic densities on the order of 10 19 cm À3 . In the self-modulated regime, where betatron radiation has been very little studied compared to the blowout regime, electrons accelerated in the wake of the laser pulse are subject to both the longitudinal plasma and transverse laser electrical fields. As a result, their motion within the wake is relatively complex; consequently, the experimental and theoretical properties of the x-ray source based on self-modulation differ from the blowout regime of laser wakefield acceleration. In our experimental configuration, electrons accelerated up to about 250 MeV and betatron x-ray spectra with critical energies of about 10-20 keV and photon fluxes between 10 8 and 10 10 photons/eV Sr are reported. Our experiments open the prospect of using betatron x-ray radiation for applications, and the source is competitive with current x-ray backlighting methods on multi-kilojoule laser systems. Published by AIP Publishing. https://doi.

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Band tunable X‐ray flat crystal spectrometer for laser‐produced plasma spectroscopy measurements

Wang

Guo

et al. 2021

X-Ray Spectrometry

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An updated design of a band‐tunable flat crystal spectrometer is presented. The new configuration contributes to a broad spectral coverage with greater resolving power, a strong rejection of hard X‐ray backgrounds, and decreased sensitivity to source broadening for an extended source. To verify the performance of the spectrometer, spectral lines were measured using a potassium acid phthalate crystal for highly ionized species of aluminum or silicon, and the results were compared by measuring H‐ and He‐like Al and Si lines by rotating the crystal to selected Bragg angles, at the Shenguang II laser facility. The observed energy‐coverage range is consistent with the theoretical predictions, as well as with the measured spectral resolution of ~300.

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Demonstration of a 13-keV KrK-shell x-ray source at the National Ignition Facility

Cited by 26 publications

References 26 publications

Simulation study of 3–5 keV x-ray conversion efficiency from Ar K-shell vs. Ag L-shell targets on the National Ignition Facility laser

Simulation study of 3–5 keV x-ray conversion efficiency from Ar K-shell vs. Ag L-shell targets on the National Ignition Facility laser

Betatron x-ray radiation from laser-plasma accelerators driven by femtosecond and picosecond laser systems

Band tunable X‐ray flat crystal spectrometer for laser‐produced plasma spectroscopy measurements

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