The first data from the Orion laser; measurements of the spectrum of hot, dense aluminium

Hoarty, D. J.; Allan, Peter; James, Steven; Brown, Colin; Hobbs, L. M. R.; Hill, M. P.; Harris, Julie A.; Morton, John; Brookes, M. G.; Shepherd, R.; Dunn, James P.; Chen, H.; Marley, E. V.; Beiersdörfer, P.; Chung, Hyun Kyung; Lee, R.W.; Brown, Gregory V.; Emig, J.

doi:10.1016/j.hedp.2013.06.005

Cited by 45 publications

(37 citation statements)

References 16 publications

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“…as an approximation which reproduces the Debye-Hückel limit (15) as well as the numerical solutions of Eq. (16) in the strong coupling regime of interest.…”

Section: A Model Calculation: Comparison To Other Approachesmentioning

confidence: 99%

Ionization-potential depression and dynamical structure factor in dense plasmas

Lin¹,

Röpke²,

Kraeft³

et al. 2017

Phys. Rev. E

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The properties of a bound electron system immersed in a plasma environment are strongly modified by the surrounding plasma. The modification of an essential quantity, the ionization energy, is described by the electronic and ionic self-energies including dynamical screening within the framework of the quantum statistical theory. Introducing the ionic dynamical structure factor as the indicator for the ionic microfield, we demonstrate that ionic correlations and fluctuations play a critical role in determining the ionization potential depression. This is in particular true for mixtures of different ions with large mass and charge asymmetry. The ionization potential depression is calculated for dense aluminum plasmas as well as for a CH plasma and compared to the experimental data and more phenomenological approaches used so far.

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“…as an approximation which reproduces the Debye-Hückel limit (15) as well as the numerical solutions of Eq. (16) in the strong coupling regime of interest.…”

Section: A Model Calculation: Comparison To Other Approachesmentioning

confidence: 99%

Ionization-potential depression and dynamical structure factor in dense plasmas

Lin¹,

Röpke²,

Kraeft³

et al. 2017

Phys. Rev. E

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“…A direct measurement of ionization potential depression is a difficult task because of its indistinguishability from the effect of spectral line merging due to Stark broadening [32]. Hoarty et al [33,34] have been able to overcome this difficulty and their measurements for Al plasma using Orion laser are in closer agreement with SP model of IPD than the EK model. This situation clearly warrants extensive and accurate ab initio study of atomic structures within dense plasma environment.…”

Section: Introductionmentioning

confidence: 99%

Nonrelativistic structure calculations of two-electron ions in a strongly coupled plasma environment

Bhattacharyya¹,

Saha

Mukherjee³

2015

Phys. Rev. A

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In this work, the controversy between the interpretations of recent measurements on dense aluminum plasma created with Linac coherent light sources (LCLS) X-ray free electron laser (FEL) and Orion laser has been addressed. In both kind of experiments, helium-like and hydrogen-like spectral lines are used for plasma diagnostics . However, there exist no precise theoretical calculations for He-like ions within dense plasma environment. The strong need for an accurate theoretical estimates for spectral properties of He-like ions in strongly coupled plasma environment leads us to perform ab initio calculations in the framework of Rayleigh-Ritz variation principle in Hylleraas coordinates where ion-sphere potential is used. An approach to resolve the long-drawn problem of numerical instability for evaluating two-electron integrals with extended basis inside a finite domain is presented here. The present values of electron densities corresponding to disappearance of different spectral lines obtained within the framework of ion-sphere potential show excellent agreement with Orion laser experiments in Al plasma and with recent theories. Moreover, this method is extended to predict the critical plasma densities at which the spectral lines of H-like and He-like carbon and argon ions disappear. Incidental degeneracy and level-crossing phenomena are being reported for the first time for two-electron ions embedded in strongly coupled plasma. Thermodynamic pressure experienced by the ions in their respective ground states inside the ion-spheres are also reported.

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“…The effect of pre-pulse on the density scale-length seen by the main short pulse has a dramatic effect on the heating possible at a given laser energy as described in refs [14,16]. Due to the requirement for a thin (2mm) type 1 KDP conversion crystal to prevent back-conversion, the diameter of the beam that can be converted using a single crystal is limited.…”

Section: Experiments On Dense Plasma Effects In Low Z Materialsmentioning

confidence: 99%

“…At high density the electrostatic field in the plasma, due to the close proximity of ions, affects the binding energy of outer electrons, lowering it significantly compared to that in an isolated ion. In the last few years results from X-ray free electron laser experiments at the Linac Coherent Light Source (LCLS) [11,12] have renewed interest in ionization potential depression along with results obtained over the same period from the Orion facility [13,14]. In the Orion experiments the ionization potential depression is diagnosed from the disappearance of aluminium line emission in He-like and H-like ions due to the upper levels becoming delocalized.…”

Section: Introductionmentioning

confidence: 99%

Measurements of plasma spectra from hot dense elements and mixtures at conditions relevant to the solar radiative zone

Hoarty¹,

Hill²,

Beiersdörfer³

et al. 2017

AIP Conference Proceedings

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Abstract. X-ray emission spectroscopy has been used to study hot dense plasmas produced using high power laser irradiation of dot samples buried in low Z foils of plastic or diamond. By combining a high contrast short pulse (picosecond timescale) laser beam operating in second harmonic with long pulse (nanosecond timescale) laser beams in third harmonic, and with pulse shaping of the long pulse beams, a range of plasma temperatures from 400eV up to 2.5keV and electron densities from 5e22 up to 1e24/cc have been accessed. Examples are given of measurements of dense plasma effects such as ionization potential depression and line-broadening from the K-shell emission spectra of a range of low Z elements and mixtures and compared to model prediction. Detailed spectra from measurements of the Lshell emission from mid-Z elements are also presented for an example spectrum of germanium. These data are at conditions found in stellar interiors and in particular in the radiative zone of the sun. The plasma conditions are inferred from comparison of the measured spectra to detailed modeling using atomic kinetics and spectral synthesis codes.

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The first data from the Orion laser; measurements of the spectrum of hot, dense aluminium

Cited by 45 publications

References 16 publications

Ionization-potential depression and dynamical structure factor in dense plasmas

Ionization-potential depression and dynamical structure factor in dense plasmas

Nonrelativistic structure calculations of two-electron ions in a strongly coupled plasma environment

Measurements of plasma spectra from hot dense elements and mixtures at conditions relevant to the solar radiative zone

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