Resonant<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi><mml:mi>α</mml:mi></mml:math>Spectroscopy of Solid-Density Aluminum Plasmas

Cho, B. I.; Engelhorn, K.; Vinko, S. M.; Chung, H.‐K.; Ciricosta, O.; Rackstraw, D. S.; Falcone, R. W.; Brown, Colin; Burian, T.; Chalupský, J.; Graves, Catherine E.; Hájková, V.; Higginbotham, Andrew; Juha, L.; Krzywiński, J.; Lee, H. J.; Messersmidt, M.; Murphy, C. D.; Ping, Yuan; Rohringer, Nina; Scherz, Andreas; Schlotter, W. F.; Toleikis, S.; Turner, James J.; Vyšín, L.; Wang, T.; Wu, Benny; Zastrau, U.; Zhu, Dan; Lee, R. W.; Nagler, Bob; Wark, J. S.; Heimann, Philip

doi:10.1103/physrevlett.109.245003

Cited by 66 publications

(58 citation statements)

References 21 publications

(24 reference statements)

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“…This K-shell hole subsequently recombines within a few femtoseconds, mainly via Auger decay from the L-shell, so that the energy of the X-ray pulse is efficiently retained, and the system is rapidly heated to peak temperatures approaching 200 eV, at solid density, within the duration of the pulse. The experiment, and the properties of the plasma created, has been described in detail elsewhere [23][24][25] .…”

Section: Experimentmentioning

confidence: 99%

“…As the experimental results are collected over the duration of the X-ray pulse, which also heats and ionizes the sample, the analysis remains reliant on the accurate modelling of the evolution of the plasma system under the intense X-ray irradiation. Therefore, we simulate the experiment using the SCFLY collisional-radiative code 8,9 , which has proved capable of modelling the non-local thermodynamic equilibrium evolution of X-ray FEL-irradiated samples [23][24][25][26][27] .…”

Section: Experimentmentioning

confidence: 99%

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Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma

et al. 2015

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The rate at which atoms and ions within a plasma are further ionized by collisions with the free electrons is a fundamental parameter that dictates the dynamics of plasma systems at intermediate and high densities. While collision rates are well known experimentally in a few dilute systems, similar measurements for nonideal plasmas at densities approaching or exceeding those of solids remain elusive. Here we describe a spectroscopic method to study collision rates in solid-density aluminium plasmas created and diagnosed using the Linac Coherent light Source free-electron X-ray laser, tuned to specific interaction pathways around the absorption edges of ionic charge states. We estimate the rate of collisional ionization in solid-density aluminium plasmas at temperatures B30 eV to be several times higher than that predicted by standard semiempirical models.

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Section: Experimentmentioning

confidence: 99%

Section: Experimentmentioning

confidence: 99%

Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma

et al. 2015

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“…Recent experimental studies have created plasmas at densities up to and exceeding that of solid material, by intense optical lasers [1], extreme ultraviolet [2]/x-ray free electron lasers [3] and pinches. If plasmas of this type remain cold, collisional-radiative models must take into account free electron degeneracy.…”

Section: Introductionmentioning

confidence: 99%

Efficient calculation of atomic rate coefficients in dense plasmas

Aslanyan¹,

Tallents²

2017

AIP Conference Proceedings

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Abstract. Modelling electron statistics in a cold, dense plasma by the Fermi-Dirac distribution leads to complications in the calculations of atomic rate coefficients. The Pauli exclusion principle slows down the rate of collisions as electrons must find unoccupied quantum states and adds a further computational cost. Methods to calculate these coefficients by direct numerical integration with a high degree of parallelism are presented. This degree of optimization allows the effects of degeneracy to be incorporated into a time-dependent collisional-radiative model. Example results from such a model are presented.

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“…Such transitions will yield broadly flat emission intensities over an extended range of FEL wavelengths, observed experimentally at higher FEL photon energies. Data in figure taken from Cho et al (2012) and Vinko et al (2012).…”

Section: Generating Hot-dense Mattermentioning

confidence: 99%

X-ray free-electron laser studies of dense plasmas

Vinko

2015

J. Plasma Phys.

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The high peak brightness of X-ray free-electron lasers (FELs), coupled with X-ray optics enabling the focusing of pulses down to sub-micron spot sizes, provides an attractive route to generating high energy-density systems on femtosecond time scales, via the isochoric heating of solid samples. Once created, the fundamental properties of these plasmas can be studied with unprecedented accuracy and control, providing essential experimental data needed to test and benchmark commonly used theoretical models and assumptions in the study of matter in extreme conditions, as well as to develop new predictive capabilities. Current advances in isochoric heating and spectroscopic plasma studies on X-ray FELs are reviewed and future research directions and opportunities discussed.

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ResonantKαSpectroscopy of Solid-Density Aluminum Plasmas

Cited by 66 publications

References 21 publications

Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma

Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma

Efficient calculation of atomic rate coefficients in dense plasmas

X-ray free-electron laser studies of dense plasmas

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