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

Vinko, S. M.; Ciricosta, O.; Preston, Thomas R.; Rackstraw, D. S.; Brown, Colin; Burian, T.; Chalupský, J.; Cho, B. I.; Chung, H.‐K.; Engelhorn, K.; Falcone, R. W.; Fiokovinini, R.; Hájková, V.; Heimann, Philip; Juha, L.; Lee, H. J.; Lee, R. W.; Messerschmidt, Marc; Nagler, Bob; Schlotter, W. F.; Turner, Joshua J.; Vyšín, L.; Zastrau, U.; Wark, J. S.

doi:10.1038/ncomms7397

Cited by 85 publications

(61 citation statements)

References 36 publications

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“…Degeneracy reductions of three-body recombination rates may also be significant in hard x-ray free electron laser measurements of ionization rates [10]. Free electron degeneracy should affect the evaluation of the ionization of metal rich 25 white dwarf stars [11].…”

Section: Introductionmentioning

confidence: 99%

“…A double peak in the pressure profile of 10 carbon shell material in the National Ignition Facility (NIF) point design due to carbon Li-like ions may have caused reduced neutron production [5]. ICF seeks to compress material at low temperatures (with pressures below 1.7 times Fermi degenerate [6]]) with high incident radiation flux (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…When degeneracy effects are important, the ionization rate of the plasmas will be significantly enhanced (for example, as seen in XFEL interaction 365 work [10]). …”

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confidence: 99%

“…if P is independent of energy E. Using the definition of the chemical potential (equation (4)), equation (10) reduces to…”

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confidence: 99%

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Free electron degeneracy effects on collisional excitation, ionization, de-excitation and three-body recombination

Tallents

2016

High Energy Density Physics

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Collisional-radiative models enable average ionization and ionization populations, plus the rates of absorption and emission of radiation to be calculated for plasmas not in thermal equilbrium. At high densities and low temperatures, electrons may have a high occupancy of the free electron quantum states and evaluations of rate coefficients need to take into account the free electron degeneracy. We demonstrate that electron degeneracy can reduce collisional rate coefficients by orders-of-magnitude from values calculated neglecting degeneracy. We show that assumptions regarding the collisional differential cross-section can alter collisional ionization and recombination rate coefficients by a further factor two under conditions relevant to inertial fusion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Free electron degeneracy effects on collisional excitation, ionization, de-excitation and three-body recombination

Tallents

2016

High Energy Density Physics

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“…In the next step, we have determined energies and rates from optimized orbitals. To compute transition parameters, we have employed the biorthogonal transformation [51] of the ASFs.…”

Section: Calculation Proceduresmentioning

confidence: 99%

Atomic Structure Calculations and Study of Plasma Parameters of Al-Like Ions

Goyal

Khatri

Singh

et al. 2016

Atoms

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Abstract:In the present paper, the spectroscopic properties and plasma characteristics of Al-like ions are investigated in an extensive and detailed manner by adopting the GRASP2K package based on fully relativistic Multi-Configuration Dirac-Hartree-Fock (MCDHF) wave-functions in the active space approximation. We have presented energy levels for Al-like ions for Valence-Valence (VV) and Core-Valence (CV) correlations under the scheme of active space. We have also provided radiative data for E1 transitions for Al-like ions and studied the variation of the transition wavelength and transition probability for electric dipole (E1) Extreme Ultraviolet (EUV) transitions with nuclear charge. Our calculated energy levels and transition wavelengths match well with available theoretical and experimental results. The discrepancies of the GRASP2K code results with CIV3 and RMPBT (Relativistic Many Body Perturbation Theory) results are also discussed. The variations of the line intensity ratio, electron density, plasma frequency and plasma skin depth with plasma temperature and nuclear charge are discussed graphically in detail for optically thin plasma in Local Thermodynamic Equilibrium (LTE). We believe that our obtained results may be beneficial for comparisons and in fusion and astrophysical plasma research.

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Pauli blocking in degenerate plasmas and the separable potential approach

Röpke

2019

Contributions to Plasma Physics

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The Mott effect describes the dissolution of bound states in a dense partially ionized plasma. It occurs when the ionization potential depression, owing to effects of correlation and degeneracy, compensates the binding energy of the bound state. At high densities and moderate temperatures, the Pauli blocking becomes important and influences significantly the degree of ionization in the region of degenerate plasmas. A quantum statistical approach is used where the total density is decomposed in an uncorrelated, “free” part and correlations, as a consequence of the cluster decomposition of the self‐energy. The contribution of correlations to the total density is given by bound states and continuum correlations. Exact solutions for a separable potential are compared to perturbation theory and numerical solutions of the in‐medium Schrödinger equation. The in‐medium scattering phase shifts are evaluated, and the role of continuum correlations is discussed. The Pauli blocking of bound states and the density of states are considered for warm dense matter conditions.

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

Cited by 85 publications

References 36 publications

Free electron degeneracy effects on collisional excitation, ionization, de-excitation and three-body recombination

Free electron degeneracy effects on collisional excitation, ionization, de-excitation and three-body recombination

Atomic Structure Calculations and Study of Plasma Parameters of Al-Like Ions

Pauli blocking in degenerate plasmas and the separable potential approach

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