university of bergen, norwaykfe.fjfi.cvut.cz/kfe/cz/aktuality/pps01/docs/kocbach.pdfsnezhinsk,...
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![Page 1: University of Bergen, Norwaykfe.fjfi.cvut.cz/kfe/cz/aktuality/pps01/docs/kocbach.pdfSnezhinsk, Chelyabinsk region, Russia Laser and Particle Beams 18 (2000), 275–289. Hydrodynamics](https://reader033.vdocuments.us/reader033/viewer/2022051903/5ff4671c36c8810b05377f3a/html5/thumbnails/1.jpg)
Modelling of emission line shapesin high parameter aluminium plasma
L. KocbachUniversity of Bergen, Norway
P.A. Loboda, V.V. PopovaAll-Russian Tech. Institute, Snezhinsk, Russia
J. Limpouch Czech Technical University, Prague
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Outline
Motivation
Line shapes
Theoretical basis of the present work
The database
Parametrizing the database
Conclusion
![Page 3: University of Bergen, Norwaykfe.fjfi.cvut.cz/kfe/cz/aktuality/pps01/docs/kocbach.pdfSnezhinsk, Chelyabinsk region, Russia Laser and Particle Beams 18 (2000), 275–289. Hydrodynamics](https://reader033.vdocuments.us/reader033/viewer/2022051903/5ff4671c36c8810b05377f3a/html5/thumbnails/3.jpg)
Motivation
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Spectrum of soft X-rays from Al-plasma
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Soft X-ray emission enhanced by a prepulse
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Spectrum of x-ray in keV-range from Al-plasma
6
4
2
0
Inte
nsity
[arb
.]
0.840.820.800.78Wavelength [nm]
1.60 1.55 1.50Photon energy [keV]
Im = 2.3×1016 W/cm2 Kα (Al0+– Al4+)
Al5+
Al6+
Heα (Al11+)
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Line shapes
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Line shapes, broadening
Line Broadening: Lorentz, Doppler, Voigt profiles
Stark broadening
electron broadening
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Stark broadening
due to the fields of neighbouring ions
Ion microfields
Distribution of microfields (static)Holtsmark 1919
Microfields determine states of the emiter
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n=2 in hydrogen-like ion (atom)
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n=3 in hydrogen-like ion (atom)
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Holtsmark function used to evaluate the distribution of electric field strength due to ions.β is scaled electric field strength.
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Stark brodened n=2 to n=1 in hydrogenic ion(model, from Holtsmarks distribution) Lyα
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Stark brodened n=3 to n=1 in hydrogenic ion(model, from Holtsmarks distribution) Lyβ
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Broadening due to electron impact
Which means also due to the presence of unbound electrons
Classical motion (semiclassical model)Quantal: Baranger’s formulation
(coherent broadening - single emitor)
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The perturbing system:
Continuum electrons present in the neighboourhood
Their density of states
Their distribution over these states
This makes the multiparticlemanifold of perturbing states
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Generalized formulations
several approaches exist
(fully quantal, semiclassical)
Density matrix formulation
(can incorporate both coherentand incoherent broadening)
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Theoretical basisof the present work
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Line shape modeling of multielectron ions in plasmas
P.A. LOBODA, I.A. LITVINENKO, G.V. BAYDIN, V.V. POPOVA, and S.V. KOLTCHUGIN
Russian Federal Nuclear CenterAll Russian Institute of Technical Physics Snezhinsk, Chelyabinsk region, Russia
Laser and Particle Beams 18 (2000), 275–289.
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Hydrodynamics codes
Ne, Te, Zav, Ti, Ni (Z)
As function of position
Postprocessing:Needs spectra as function of
Ne, Te, Zav, Ti, Ni (Z)
Gives spectra integrated over space region or/and time
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The database
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The data has been produced by the Snezhinsk code inthe framework of a project of
Bergen Computational Physics Laboratory
April 2001
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The ranges of the aluminium line databaseLyα , Lyβ …… Lyζ Heα , Heβ …… Heζ Satellites
Ne1.000 1020 cm-3
3.162 1020 cm-3
1.000 1021 cm-3
3.162 1021 cm-3
1.000 1022 cm-3
3.162 1022 cm-3
1.000 1023 cm-3
Zav={ 10,12 } Ti = { 0.2 Te ,Te }
Te0.050 keV0.100 keV0.200 keV0.400 keV0.600 keV0.900 keV1.200 keV1.600 keV2.000 keV
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>>>> >> >> gview >> >> figure 7 plots
Ly-a Z=10 N_e=1.000e+020cm^{-3} T_e=0.050keV T_i=0.050keV Ly-a Z=10 N_e=1.000e+020cm^{-3} T_e=2.000keV T_i=2.000keV
figure 6 plotsLy-a Z=10 N_e=1.000e+020cm^{-3} T_e=2.000keV T_i=2.000keV
>>>>
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He-a Z=10 N_e=1.000e+020cm^{-3} T_e=0.050keV T_i=0.050keV He-a Z=10 N_e=1.000e+020cm^{-3} T_e=2.000keV T_i=2.000keV
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He-a Z=10 N_e=1.000e+023cm^{-3} T_e=0.050keV T_i=0.050keV He-a Z=10 N_e=1.000e+020cm^{-3} T_e=0.050keV T_i=0.050keV He-a Z=10 N_e=1.000e+023cm^{-3} T_e=2.000keV T_i=2.000keV
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Ly-a Z=10 N_e=1.000e+020cm^{-3} T_e=0.050keV T_i=0.010keV Ly-a Z=10 N_e=1.000e+023cm^{-3} T_e=2.000keV T_i=0.400keV Ly-a Z=10 N_e=1.000e+023cm^{-3} T_e=2.000keV T_i=2.000keV
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Ly-a Z=10 N_e=1.000e+020cm^{-3} T_e=0.050keV T_i=0.010keV Ly-a Z=10 N_e=1.000e+023cm^{-3} T_e=2.000keV T_i=0.400keV Ly-a Z=10 N_e=1.000e+023cm^{-3} T_e=2.000keV T_i=2.000keV
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Parametrizing the database
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Attempt to fit Heα by a Lorentzian (automatic fitter)
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Attempt to fit Heα by a Gaussian (automatic fitter)
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Attempt to fit Heα by a combined Lorentzian + Gaussian (automatic)
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Conclusions
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The database is useful as a source of data files for simulations
The work with automatic parametrization is promissing
The parametrization will greatly simplify the applications of the line data.