E. Mínguez

Recent results in the analysis of heavy-ion-beam-driven ICF targets☆

Abstract As a continuation of previous work on the analysis and optimization of ICF beam and target configurations, the influence of the energy deposition profi

Development of an analytical potential to include excited configurations

Excited configurations are very important in dense plasma physics. In this work we propose a new analytical potential for excited configurations obtained from another one for ground configuration. With this potential several atomic magnitudes have been calculated for ions in excited configurations analyzing what kind of excited configurations introduce more influences in those magnitudes. Using this potential, atomic data generated are satisfactorily compared with those obtained using other analytical potential using sophisticated self-consistent codes, and with others available in the bibliography.

Scaling law of radiative opacities for ICF elements

Abstract This work is focused on the determination of Rosseland and Planck mean analytical formulas for several single elements used in ICF targets. A scaling law of these mean opacities is given as a function of the plasma parameters: electron temperature and plasma density. These opacities have been tested with numerical results from other codes and with available experimental results.

Opacities and line transfer in high density plasma

In this work, we first presents a review of the work that research teams have developed in collaboration in order to determine the optical properties of plasmas during the recent years, and showing the achievements reached. The second part of this paper is devoted to one of these improvements, which is to include reabsorption of the radiation in the calculationsofdenseopticallythickplasmasinnon-LTEconditions.Twomodelsrecentlydevelopedforthispurposeare presented.Thequantitativestudywasfocusedonaluminumplasmas,whichwasobtainedrecentlyatLULIexperiments.

Low Z opacities at high densities

Abstract We present an experimental study devoted to measuring the opacity of bound–bound transitions in ultra-dense, hot, low Z plasmas, which are at the extreme limit for conditions of both emission spectroscopy and absorption spectroscopy. In this work, we develop an absorption spectroscopy experiment specially adapted to high-density diagnostics, using newly designed structured targets and an ultra-high resolution spectrograph. An aluminum plasma is chosen as the first candidate and the opacity of the He-like 1s 2 –1s2p (He β ) and 1s 2 –1s3p (He γ ) transitions are measured.

Calculation of the ionization state for LTE plasmas using a new relativistic-screened hydrogenic model based on analytical potentials

In this work, the Saha equation is solved using atomic data provided by means of a new relativistic-screened hydrogenic model based on analytical potentials to calculate the ionization state and ion abundance for LTE iron plasmas. The plasma effects on the atomic structure are taken into account by including the classical continuum lowering correction of Stewart and Pyatt. For high density, the Saha equation is modified to consider the degeneration of free electrons using the Fermi-Dirac statistics instead of the Maxwellian distribution commonly used. The results are compared with more sophisticated self-consistent codes.

Improving the dicenter model for hot dense plasmas: molecular stark effect

Abstract In previous work of the dicenter model, used to take into account the ionic correlation effects in hot dense plasmas, only considered a single perturbing ion (i.e., the nearest neighbor ion) thus limiting its range of applicability. The improvement proposed in the present work includes the effect of all perturbing ions through a quasistatic external microfield acting on a “quasi-molecule”. This enlarges the domain of validity of the dicenter model. For low densities this new alternative model gives line widths in agreement with standard “monocenter” profiles without artificially reducing the electron screening inside the dicenter emitting cell. This reduced screening, which had been employed to treat the repulsive interactions between the quasi-molecule and the other perturbing ions, is removed in the present work.

Modelling of spectral properties and population kinetics studies of inertial fusion and laboratory-astrophysical plasmas

Fundamental research and modelling in plasma atomic physics continue to be essential for providing basic understanding of many different topics relevant to high-energy-density plasmas. The Atomic Physics Group at the Institute of Nuclear Fusion has accumulated experience over the years in developing a collection of computational models and tools for determining the atomic energy structure, ionization balance and radiative properties of, mainly, inertial fusion and laser-produced plasmas in a variety of conditions. In this work, we discuss some of the latest advances and results of our research, with emphasis on inertial fusion and laboratory-astrophysical applications.

Detailed-level-accounting approach calculation of radiative properties of aluminium plasmas in a wide range of density and temperature

In this work it is accomplished a study of radiative properties of aluminium plasmas. It is analyzed the calculation of spectrally resolved and mean opacities both under NLTE and LTE approaches. Furthermore, the effect of the re-absorption of the radiation in these magnitudes is also examined. The calculations were performed into the detailed-level- accounting approach including configuration interaction among the levels belonging to the same non-relativistic configuration.

A comparison of two atomic models for the radiative properties of dense hot low Z plasmas

Abstract In this work, two different atomic models (ANALOP based on parametric potentials and IDEFIX based on the dicenter model) are used to calculate the opacities for bound–bound transitions in hot dense, low Z plasmas, and the results are compared to each other. In addition, the ANALOP code has been used to compute free–bound cross sections for hydrogen-like ions.