Dielectronic Satellites and Auger Electron Heating: Irradiation of Solids by Intense XUV-Free Electron Laser Radiation

Petitdemange, F.; Rosmej, F. B.

doi:10.1007/978-3-642-38167-6_6

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…Therefore, LTE-populations can only be achieved for electron densities above solid density and non-LTE level populations have to be considered for almost all parameters of practical interest. However, it has been shown recently [22] with detailed collisionalradiative population kinetics involving all LSJ-split autoionizing levels that excited states coupling effects drive the autoionizing states K 2 L 7 M 2 to Boltzmann populations for densities larger than only n e = 10 21 cm −3 .T h i s indicates that the LTE assumption is also justified for the M2-states for the parameters considered in this paper. Therefore all PPP-calculations have been carried out invoking LTE-populations although the code in principle can treat also non-LTE level populations.…”

Section: Interference Effects In Line Broadening Theorymentioning

confidence: 70%

Interference effects and Stark broadening in XUV intrashell transitions in aluminum under conditions of intense XUV free-electron-laser irradiation

et al. 2013

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Quantum mechanical interference effects in the line broadening of intra-shell transitions are investigated for dense plasma conditions. Simulations that involved LSJ-split level structure and intermediate coupling discovered unexpected strong line narrowing for intra-shell transitions L-L while M-L transitions remained practically unaffected by interference effects. This behaviour allows a robust study of line narrowing in dense plasmas. Simulations are carried out for XUV transitions of aluminum that have recently been observed in experiments with the FLASH Free Electron Laser irradiating solid aluminum samples with intensities greater than 10 16 W/cm 2 . We explore the advantageous case of Al that allows first, simultaneous observation of M-L transitions and L-L intra-shell transitions with high resolution grating spectrometers and, second, has a convenient threshold to study interference effects at densities much below solid. Finally we present simulations at near solid density where the line emission transforms into a quasi-continuum.

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Section: Interference Effects In Line Broadening Theorymentioning

confidence: 70%

Interference effects and Stark broadening in XUV intrashell transitions in aluminum under conditions of intense XUV free-electron-laser irradiation

et al. 2013

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“…These elements can either occur as intrinsic impurities or their small amounts (the so-called 'tracer elements') may be intentionally injected into the investigated matter. This makes plasma spectroscopy a very interdisciplinary science, as confirmed by previously published excellent reviews [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 89%

Exotic x-ray emission from dense plasmas

Rosmej

Dachicourt

Deschaud

et al. 2015

J. Phys. B: At. Mol. Opt. Phys.

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Exotic x-ray emission from dense matter is identified as the complex high intensity satellite emission from autoionizing states of highly charged ions. Among a vast amount of possible transitions, double K-hole hollow ion (HI) x-ray emission K0LX → K1LX−1 + hνhollow is of exceptional interest due to its advanced diagnostic potential for matter under extreme conditions where opacity and radiation fields play important roles. Transient ab initio simulations identify intense short pulse radiation fields (e.g., those emitted by x-ray free electron lasers) as possible driving mechanisms of HI x-ray emission via two distinct channels: first, successive photoionization of K-shell electrons, second, photoionization followed by resonant photoexciation among various ionic charge states that are simultaneously present in high density matter. We demonstrated that charge exchange of intermixing inhomogenous plasmas as well as collisions driven by suprathermal electrons are possible mechanisms to populate HIs to observable levels in dense plasmas, particularly in high current Z-pinch plasmas and high intensity field-ionized laser produced plasmas. Although the HI x-ray transitions were repeatedly identified in many other cases of dense optical laser produced plasmas on the basis of atomic structure calculations, their origin is far from being understood and remains one of the last holy grails of high intensity laser–matter interaction.

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“…4b) 3 is the most intense. The simulations show [14,15] that the spectral distribution of Fig. 4a is almost close to the Boltzmann limit whereas a spectral distribution like in Fig.…”

Section: Resultsmentioning

confidence: 78%

“…Atomic data, cross sections and rate coefficients have been calculated with the FAC-code [16]. More details are described elsewhere [14]. As mentioned above, the simulations show that the spectral distribution (in particular the high emission of the 3 satellite group) can only be reasonably described invoking hot electrons with a fraction of some percent: f hot = 3%.…”

Section: Epj Web Of Conferencesmentioning

confidence: 98%

“…In dense plasmas, population can also be redistributed via electron collisions among different autoionizing states thereby allowing to detect density effects on the spectral distribution [14,15]. Figure 2 shows the time integrated pinhole image: hot spot emission at the crossing point, emission from the heated wires and an emission along the z-direction.The z-direction corresponds to the propagation direction of the hot electrons that provoke emission when colliding with atoms and ions.…”

Section: Effect Of Hot Electrons On Level Excitation In Plasmamentioning

confidence: 99%

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Spaced resolved analysis of suprathermal electrons in dense plasma

Moinard

Petitdemange

Larour

et al. 2013

EPJ Web of Conferences

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Abstract. The investigation of the hot electron fraction is a crucial topic for high energy density laser driven plasmas: first, energy losses and radiative properties depend strongly on the hot electron fraction and, second, in ICF hohlraums suprathermal electrons preheat the D-T-capsule and seriously reduce the fusion performance. In the present work we present our first experimental and theoretical studies to analyze single shot space resolved hot electron fractions inside dense plasmas via optically thin X-ray line transitions from autoionizing states. The benchmark experiment has been carried out at an X-pinch in order to create a dense, localized plasma with a well defined symmetry axis of hot electron propagation. Simultaneous high spatial and spectral resolution in the X-ray spectral range has been obtained with a spherically bent quartz Bragg crystal. The high performance of the X-ray diagnostics allowed to identify space resolved hot electron fractions via the X-ray spectral distribution of multiple excited states.

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Dielectronic Satellites and Auger Electron Heating: Irradiation of Solids by Intense XUV-Free Electron Laser Radiation

Cited by 10 publications

References 15 publications

Interference effects and Stark broadening in XUV intrashell transitions in aluminum under conditions of intense XUV free-electron-laser irradiation

Interference effects and Stark broadening in XUV intrashell transitions in aluminum under conditions of intense XUV free-electron-laser irradiation

Exotic x-ray emission from dense plasmas

Spaced resolved analysis of suprathermal electrons in dense plasma

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