scholarly journals Optimization study of a photoionization experiment of a laser-produced He-like plasma by an X-ray source

1992 ◽  
Vol 10 (4) ◽  
pp. 793-799 ◽  
Author(s):  
C. A. Back ◽  
P. Renaudin ◽  
C. Chenais-Popovics ◽  
J. C. Gauthier
Keyword(s):  
Ground State ◽  
Optimal Temperature ◽  
Hydrodynamic Models ◽  
Optimum Time ◽  
X Ray ◽  
Band Emission ◽  
Optimization Study ◽  
Aluminum Plasma ◽  
Collisional Radiative Model ◽  
Radiative Model

A study of the effects of photoionization of a laser-produced plasma has been carried out by modeling the fluorescence of resonance lines due to cascades. The photoionization source is the X-ray M-band emission of a laser-produced high-Z plasma and it perturbs a ground state He-like aluminum plasma. Simulations have been performed to study the conditions necessary to maximize the fluorescence and guide future experiments. A collisional-radiative model is used to determine the optimal temperature and density of the pumped plasma, while hydrodynamic models are used to produce realistic plasma gradients and explore the optimum time delay of the photopumping.

scholarly journals Simulation of dense aluminum plasma under intense X-rays

2021 ◽  
pp. 1-15
Author(s):  
Dmitrii Andreevich Kim ◽  
Ilia Yurievich Vichev ◽  
Anna Dmitrievna Solomyannaya ◽  
Alexander Sergeevich Grushin
Keyword(s):  
Emission Spectrum ◽  
Free Electron ◽  
Free Electron Laser ◽  
Aluminum Film ◽  
X Rays ◽  
Main Attention ◽  
X Ray ◽  
Aluminum Plasma ◽  
Collisional Radiative Model ◽  
Radiative Model

The THERMOS code was used to calculate the properties of dense photoionized aluminum plasma. The case is based on an experiment carried out at the LCLS, where an aluminum film was irradiated with intense X-ray radiation with a photon energy of 1650 eV using a free-electron laser. The evolution of the aluminum plasma was considered, the populations of states and the emission spectrum were calculated. The main attention was paid to the study of the effects associated with nonstationarity and ionization potentials depression due to high density using collisional-radiative model.

Diagnostics of Gold Laser Plasmas

1988 ◽  
Vol 102 ◽  
pp. 357-360
Author(s):  
J.C. Gauthier ◽  
J.P. Geindre ◽  
P. Monier ◽  
C. Chenais-Popovics ◽  
N. Tragin ◽  
...  
Keyword(s):  
Experimental Results ◽  
Pure Gold ◽  
Electronic Temperature ◽  
X Ray ◽  
Laser Plasmas ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractIn order to achieve a nickel-like X ray laser scheme we need a tool to determine the parameters which characterise the high-Z plasma. The aim of this work is to study gold laser plasmas and to compare experimental results to a collisional-radiative model which describes nickel-like ions. The electronic temperature and density are measured by the emission of an aluminium tracer. They are compared to the predictions of the nickel-like model for pure gold. The results show that the density and temperature can be estimated in a pure gold plasma.

scholarly journals Theoretical Modeling of High-Resolution X-ray Spectra Emitted by Tungsten and Molybdenum Ions from Tokamak Plasmas

2020 ◽  
Vol 39 (5) ◽  
pp. 194-201
Author(s):  
Ł. Syrocki ◽  
K. Słabkowska ◽  
E. Węder ◽  
M. Polasik ◽  
J. Rzadkiewicz
Keyword(s):  
High Temperature ◽  
High Resolution ◽  
Detailed Analysis ◽  
Electron Density ◽  
Wavelength Range ◽  
Tokamak Plasmas ◽  
Temperature Plasma ◽  
X Ray ◽  
Collisional Radiative Model ◽  
Radiative Model

AbstractIn order to allow the advanced interpretation of the X-ray spectra registered by the high-resolution crystal KX1 spectrometer on the JET with an ITER-like wall, especially to determine how the relative emission contributions of tungsten and molybdenum ions change during a JET discharge, the X-ray spectra have been carefully modeled over a narrow wavelength range. The simulations have been done in the framework of Collisional–Radiative model implemented in Flexible Atomic Code for an electron density (ne = 2.5 × 1019 m−3), and electron temperatures between Te = 3.0 keV and Te = 4.5 keV, typical for JET. Moreover, performed detailed analysis in the framework of the proposed procedure can be useful in determining temperature of a high temperature plasma generated in tokamaks.

Temperature and impurity transport studies of heated tokamak plasmas by means of a collisional-radiative model of x-ray emission fromMo30+toMo39+

2000 ◽  
Vol 61 (5) ◽  
pp. 5701-5709 ◽  
Author(s):  
D. Pacella ◽  
K. B. Fournier ◽  
M. Zerbini ◽  
M. Finkenthal ◽  
M. Mattioli ◽  
...  
Keyword(s):  
Tokamak Plasmas ◽  
X Ray ◽  
Transport Studies ◽  
Impurity Transport ◽  
Collisional Radiative Model ◽  
Radiative Model

Non L.T.E. Properties of Quasistationary Oxygen Plasmas

1976 ◽  
Vol 31 (3-4) ◽  
pp. 362-368 ◽  
Author(s):  
M. Cacciatore ◽  
M. Capitelli
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Ground State ◽  
Radiative Recombination ◽  
Local Thermodynamic Equilibrium ◽  
Collisional Radiative Model ◽  
Radiative Model ◽  
Ionization Coefficients ◽  
Selection Of ◽  
The Continuum

The non L.T.E. (local thermodynamic equilibrium) properties of optically thin and thick quasistationary oxygen plasmas have been calculated for the temperature range k T = 0.5 - 1.5 eV and for the electron density interval 108 - 1016 cm-3 , by using the collisional-radiative model of Bates, Kingston and McWhirther. The results include1 the coefficients r0(i) and r1(i), which represent the contribution to the population density of the ith quantum level from the continuum and from the ground state, respectively2 the values of α and S, which are the collisional-radiative recombination and ionization coefficients, respectively. The accuracy of the present results is discussed in connection with the adopted plasma model and with the selection of the collisional cross sections for forbidden and allowed transitions. A discussion is also presented of the influence of the two low lying excited states of oxygen atoms (i.e. the states 2p41D, 2p41S) on the non L.T.E. properties of these plasmas. A satisfactory agreement is found with the calculations of Julienne et al. and with the experimental results of Jones.

scholarly journals Study of X-ray laser interaction plasmas

1992 ◽  
Vol 10 (4) ◽  
pp. 821-826 ◽  
Author(s):  
R. Kodama
Keyword(s):  
Laser Intensity ◽  
Laser Interaction ◽  
Atomic Processes ◽  
Model Population ◽  
X Ray ◽  
Collisional Radiative Model ◽  
Radiative Model

Atomic processes in X-ray laser interaction plasmas are investigated by using a collisional-radiative model. Population inversions on free-bound transitions can be produced by photoionization above a threshold of incident X-ray laser intensity and lead to stimulated free-bound emission (SFBE). Free-bound lasers pumped by intense X-ray lasers are proposed and their feasibility is investigated simply considering X-ray laser interaction plasmas.

scholarly journals PyAtomDB: Extending the AtomDB Atomic Database to Model New Plasma Processes and Uncertainties

Atoms ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 49
Author(s):  
Adam R. Foster ◽  
Keri Heuer
Keyword(s):  
Software Package ◽  
Extreme Ultraviolet ◽  
Emission Lines ◽  
Atomic Data ◽  
Model Calculations ◽  
X Ray ◽  
Hot Plasma ◽  
Collisional Radiative Model ◽  
Radiative Model ◽  
Spectrum Generation

The AtomDB project provides models of X-ray and extreme ultraviolet emitting astrophysical spectra for optically thin, hot plasma. We present the new software package, PyAtomDB, which now underpins the entire project, providing access to the underlying database, collisional radiative model calculations, and spectrum generation for a range of models. PyAtomDB is easily extensible, allowing users to build new tools and models for use in analysis packages such as XSPEC. We present two of these, the kappa and ACX models for non-Maxwellian and Charge-Exchange plasmas respectively. In addition, PyAtomDB allows for full open access to the apec code, which underlies all of the AtomDB spectra and has enabled the development of a module for estimating the sensitivity of emission lines and diagnostic line ratios to uncertainties in the underlying atomic data. We present these publicly available tools and results for several X-ray diagnostics of Fe L-shell ions and He-like ions as examples.

A quantitative study of the forbidden and intercombination transitions arising from the Li-like Al autoionizing levels

2015 ◽  
Vol 93 (11) ◽  
pp. 1413-1419 ◽  
Author(s):  
C. Iorga ◽  
V. Stancalie
Keyword(s):  
Full Width Half Maximum ◽  
Quantitative Description ◽  
Atomic Processes ◽  
Test Bed ◽  
Population Kinetics ◽  
Electron Transitions ◽  
Aluminum Plasma ◽  
Collisional Radiative Model ◽  
Radiative Model ◽  
The Individual

This work presents results from detailed quantitative description of the level population kinetics responsible for the relatively high line-intensity of the forbidden and intercombination transitions arising from autoionization states. The goal is to investigate the influence of different atomic processes on the emission spectrum of the laser-produced aluminum plasma obtained at the nhelix-laser test bed facility at GSI (PRA 63, 032716). In the experiment a Nd-glass YAG laser beam having 50 J pulse energy, 15 ns full width half maximum duration and 1.064 μm wavelength is focused on a massive Al target. To simulate the experimental reported spectrum, the population kinetics is investigated based on a collisional radiative model. The theoretical spectroscopic investigation reported here indicates the existence of anomalous high intensity X-ray intercombination and two-electron transitions arising from autoionizing states in Li-like Al ion. Detailed atomic structure calculation and kinetics modeling is performed to find out the individual states involved, and the population density distribution over them. Presented results are useful for femtosecond-laser produced plasma experiments and diagnostics.

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