Uncertainties in radiation flow experiments

Fryer, Christopher L.; Dodd, E. S.; Even, Wesley; Fontes, C. J.; Greeff, C. W.; Hungerford, Aimee L.; Kline, J. L.; Mussack, Katie; Tregillis, I. L.; Workman, J.; Benstead, J.; Guymer, T. M.; Moore, A. S.; Morton, John

doi:10.1016/j.hedp.2016.01.003

Cited by 27 publications

(32 citation statements)

References 17 publications

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“…As with many (if not all) laboratory experiments, uncertainties in the initial conditions can affect the interpretation of the experiment, limiting the ability of these ex-periments to constrain the physics studied in the experiment. The initial-condition uncertainties were studied in detail in the Pleiades experiment, focusing on the effect of these uncertainties on the position of the shock as a function of time [6]. The COAX temperature diagnostic provides an additional constraint to better understand radiation flow uncertainties.…”

Section: Uncertainties In the Initial Conditionsmentioning

confidence: 99%

“…In the Pleiades experiment, foam density measurements typically had 3-4% errors and different measurement techniques produced different results [6]. To study the dependence on density, we varied the density for our COAX experiment from 62 − 71 mg cm −3 .…”

Section: Target Uncertaintiesmentioning

confidence: 99%

“…COAX is the successor to Pleaides, an experiment designed as a first step in studying radiation flow, using a hohlraum drive to study supersonic diffusive flow down a single foam tube constrained by a high opacity wall [11,6]. This experiment had two sets of diagnostics: soft X-ray spectral emission of the shock front and a DANTE detection to measure the emergence of the heat front as it emerged from the foam.…”

Section: Introductionmentioning

confidence: 99%

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Designing radiation transport tests: Simulation-driven uncertainty-quantification of the COAX temperature diagnostic

Fryer¹,

Diaw²,

Fontes³

et al. 2020

High Energy Density Physics

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One of the difficulties in developing accurate numerical models of radiation flow in a coupled radiation-hydrodynamics setting is accurately modeling the transmission across a boundary layer. The COAX experiment is a platform design to test this transmission including standard radiograph and flux diagnostics as well as a temperature diagnostic measuring the population of excitation levels and ionization states of a dopant embedded within the target material. Using a broad range of simulations, we study the experimental errors in this temperature diagnostic. We conclude with proposed physics experiments that show features that are much stronger than the experimental errors and provide the means to study transport models.

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Section: Uncertainties In the Initial Conditionsmentioning

confidence: 99%

Section: Target Uncertaintiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Designing radiation transport tests: Simulation-driven uncertainty-quantification of the COAX temperature diagnostic

Fryer¹,

Diaw²,

Fontes³

et al. 2020

High Energy Density Physics

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“…On this basis, AWE has participated in many NIF campaigns. Examples include the ‘Pleiades' radiation transport experiments, which were used to characterize a reproducible 350 eV X-ray drive target [18,19]. These experiments (in collaboration with Los Alamos National Laboratory) also constrained several of the material properties required to model propagation of radiation through low-density foams and led to the development and qualification of new diagnostics on NIF.…”

Section: The National Ignition Facilitymentioning

confidence: 99%

Inertial confinement fusion: a defence context

Randewich

Lock

Garbett

et al. 2020

Phil. Trans. R. Soc. A.

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Almost 30 years since the last UK nuclear test, it remains necessary regularly to underwrite the safety and effectiveness of the National Nuclear Deterrent. To do so has been possible to date because of the development of continually improving science and engineering tools running on ever more powerful high-performance computing platforms, underpinned by cutting-edge experimental facilities. While some of these facilities, such as the Orion laser, are based in the UK, others are accessed by international collaboration. This is most notably with the USA via capabilities such as the National Ignition Facility, but also with France where a joint hydrodynamics facility is nearing completion following establishment of a Treaty in 2010. Despite the remarkable capability of the science and engineering tools, there is an increasing requirement for experiments as materials age and systems inevitably evolve further from what was specifically trialled at underground nuclear tests (UGTs). The data from UGTs will remain the best possible representation of the extreme conditions generated in a nuclear explosion, but it is essential to supplement these data by realizing new capabilities that will bring us closer to achieving laboratory simulations of these conditions. For high-energy-density physics, the most promising technique for generating temperatures and densities of interest is inertial confinement fusion (ICF). Continued research in ICF by the UK will support the certification of the deterrent for decades to come; hence the UK works closely with the international community to develop ICF science. UK Ministry of Defence © Crown Owned Copyright 2020/AWE. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 1)'.

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“…The second shot (N150521-002) used a Pleiades HED physics target. 9,10 The Pleiades platform consists of a vacuum gold half-hohlraum ("halfraum") attached to a gold cylinder containing a foam material under observation. 80 beams from the lower hemisphere of NIF deliver ≈360 kJ of laser energy to the halfraum over 2.5 ns, which in turn generates an xray drive which propagates into and through the foam in the cylinder.…”

Section: Diagnostic Performancementioning

confidence: 99%

A new streaked soft x-ray imager for the National Ignition Facility

Benstead

Moore

Ahmed

et al. 2016

Review of Scientific Instruments

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A new streaked soft x-ray imager has been designed for use on high energy-density (HED) physics experiments at the National Ignition Facility based at the Lawrence Livermore National Laboratory. This streaked imager uses a slit aperture, single shallow angle reflection from a nickel mirror, and soft x-ray filtering to, when coupled to one of the NIF's x-ray streak cameras, record a 4× magnification, one-dimensional image of an x-ray source with a spatial resolution of less than 90 μm. The energy band pass produced depends upon the filter material used; for the first qualification shots, vanadium and silver-on-titanium filters were used to gate on photon energy ranges of approximately 300-510 eV and 200-400 eV, respectively. A two-channel version of the snout is available for x-ray sources up to 1 mm and a single-channel is available for larger sources up to 3 mm. Both the one and two-channel variants have been qualified on quartz wire and HED physics target shots.

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Uncertainties in radiation flow experiments

Cited by 27 publications

References 17 publications

Designing radiation transport tests: Simulation-driven uncertainty-quantification of the COAX temperature diagnostic

Designing radiation transport tests: Simulation-driven uncertainty-quantification of the COAX temperature diagnostic

Inertial confinement fusion: a defence context

A new streaked soft x-ray imager for the National Ignition Facility

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