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  • 1
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    3s-3p laser gain and X-ray line ratios for the carbon isoelectronic sequence (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Calculations have been conducted for the 46 levels belonging to six different configurations in the C I isoatomic sequence, for atomic numbers 18, 22, 26, 30, 34, and 36, with electron densities in the 10 to the 15th to 10 to the 22nd/cu cm range. The 2s2 2p 3p levels' large populations are due to the large electron collisional monopole excitation rates from the ground configuration, as well as to the small radiative decay rates to the ground configuration; this leads to population inversions for transitions of the 3s-3p type. Attention is given to the density-dependence of X-ray line ratios, which represent a promising diagnostic for electron density.
    Keywords: LASERS AND MASERS
    Type: Journal of Applied Physics (ISSN 0021-8979); 59; 3953-395
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  • 2
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    Laser gain on 3p-3d and 3s-3p transitions and X-ray line ratios for the nitrogen isoelectronic sequence (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Results are presented on calculations of the 72 levels belonging to the 2s(2)2p(3), 2s2p(4), 2p(5), 2s(2)2p(2)3s, 2s(2)2p(2)3p, and 2s(2)2p(2)3d configurations of the N I isoelectronic sequence for the ions Ar XII, Ti XVI, Fe XX, Zn XXIV, and Kr XXX, for electron densities up to 10 to the 24th/cu cm. It was found that large population inversions and gain occur between levels in the 2s(2)2p(2)3p configuration and levels in the 2s(2)2p(2)3d configuration that cannot decay to the ground configuration by an electric dipole transition. For increasing electron densities, the intensities of the X-ray transitions from the 2s(2)2p(2)3p configuration to the ground configuration decrease relative to the transitions from the 2s(2)2p(2)3s and 2s(2)2p(2)3d configurations to the ground configuration. The density dependence of these X-ray line ratios is presented.
    Keywords: LASERS AND MASERS
    Type: Journal of Applied Physics (ISSN 0021-8979); 66; 2248-225
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  • 3
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    Neonlike Ar and Cl 3p-3s emission from a theta-pinch plasma (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Time-resolved extreme-UV emission from sixteen 3p-3s transitions, some of the type in which lasing has been demonstrated in heavier elements, is measured for neonlike Ar(8+) and Cl(7+). These observations are made on a hydrogen theta-pinch plasma with a 5 pct admixture of argon or freon (for Cl). Fourteen 3d-3p spectral lines are also detected. The measured intensities are compared to theoretical predictions. There is no evidence of anomalously intense lines originating on 2p5 3p J = 2 upper levels compared to J = 0, as observed in gain experiments.
    Keywords: LASERS AND MASERS
    Type: Physical Review A - General Physics, 3rd Series (ISSN 0556-2791); 40; 4142-414
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  • 4
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    Short wavelength laser calculations for electron pumping in neon-like krypton (Kr XXVII) (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Calculations of electron impact collision strengths and spontaneous radiative decay rates are made for neon-like krypton (Kr XXVII) for the 2s2 2p6, 2s2 2p5 3s, 2s2 2p5 3p, and 2s2 2p5 3d configurations. From these atomic data, the level populations as a function of the electron density are calculated at two temperatures, 1 x 10 to the 7th K and 3 x 10 to the 7th K. An analysis of level populations reveals that a volume of krypton in which a significant number of the ions are in the Kr XXVII degree of ionization can produce a significant gain in transition between the 2s2 2p5 3s and 2s2 2p5 3p configurations. At an electron density of 1 x 10 to the 19th/cu cm the plasma length has to be of the order of 1 m; at a density of 1 x 10 to the 21st/cu cm the length is reduced to approximately 0.5 cm; and at an electron density of 1 x 10 to the 22nd/cu cm the length of the plasma is further reduced to approximately 1 mm.
    Keywords: LASERS AND MASERS
    Type: Journal of Applied Physics (ISSN 0021-8979); 54; May 1983
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  • 5
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    Scaling of collisionally pumped 3s-3p lasers in the neon isoelectronic sequence (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Atomic-number scaling in the 3p-3s population-inversion and plasma parameters of neonlike ions of Si, Ar, Ti, Fe, Ge, and Kr is investigated theoretically. The population levels are calculated; the Z-scaling relationships are defined; the results are presented in tables and graphs; and the implications for the laser gain are explored. Laser gain in excess of 1/cm are predicted for all ions except Si V, with a peak of 30/cm for Fe XVII at electron density 10 to the 21st/cu cm.
    Keywords: LASERS AND MASERS
    Type: Journal of Applied Physics (ISSN 0021-8979); 56; 2475-247
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  • 6
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    Development of a Method for Local Electron Temperature and Density Measurements in the Divertor of the JET Tokamak (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-27
    Description: Plasma volume recombination in the divertor, a process in which charged particles recombine to neutral atoms, contributes to plasma detachment and hence cooling at the divertor target region. Detachment has been observed at JET and other tokamaks and is known to occur at low electron temperatures (T(sub e)〈1 eV) and at high electron density (n(sub e)〉10(exp 20)/m(exp 3)). The ability to measure such low temperatures is therefore of interest for modelling the divertor. In present work we report development of a new spectroscopic technique for investigation of local electron density (n(sub e)) and temperature (T,) in the outer divertor at JET.
    Keywords: Plasma Physics
    Type: 31st EPS Conference on Plasma Physics; 28 Jun. 2 Jul. 2004; London; United Kingdom
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  • 7
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    Free-Free Transitions of e-H System Inside a Dense Plasma Irradiated by a Laser Field at Very Low Incident Electron Energies (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The free-free transition is studied for an electron-hydrogen in the ground state at low incident energies in the presence of an external homogenous, monochromatic, and linearly polarized laser-field inside a hot dense plasma.The effect of plasma screening is considered in the Debye-Huckel approximation. The calculations are performed in the soft photon limit, assuming that the plasma frequency is much higher than the laser frequency. The incident electron is considered to be dressed by the laser field in a nonperturbative manner by choosing the Volkov solutions in both the initial and final channels. The space part of the scattering wave function for the electron is solved numerically by taking into account the electron exchange. The laser-assisted differential and total cross sections are calculated for single-photon absorption /emission and no photon exchange in the soft photon limit, the laser intensity being much less than the atomic field intensity. The calculations have been carried out for various values of Debye parameter, ranging from 0.005 to 0.12. A strong suppression is noted in the laser-assisted cross sections as compared to the field-free situation. A significant difference is noted for the singlet and triplet cross sections. The suppression is much more in the triplet states.
    Keywords: Plasma Physics
    Type: GSC.JA.6762.2012 , to be published in Physical Review A
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  • 8
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    Hybrid Theory of Electron-Hydrogenic Systems Elastic Scattering (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Accurate electron-hydrogen and electron-hydrogenic cross sections are required to interpret fusion experiments, laboratory plasma physics and properties of the solar and astrophysical plasmas. We have developed a method in which the short-range and long-range correlations can be included at the same time in the scattering equations. The phase shifts have rigorous lower bounds and the scattering lengths have rigorous upper bounds. The phase shifts in the resonance region can be used to calculate very accurately the resonance parameters.
    Keywords: Plasma Physics
    Type: GSFC.JA.01074.2012
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  • 9
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    Free-Free Transitions of the e-H System Inside a Dense Plasma Irradiated by a Laser Field at Very Low Incident-Electron Energies (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The free-free transition is studied for an electron-hydrogen atom in ground state when a low-energy electron (external) is injected into hydrogenic plasma in the presence of an external homogenous, monochromatic, and linearly polarized laser field. The effect of plasma screening is considered in the Debye-Huckel approximation. The calculations are performed in the soft photon limit. The incident electron is considered to be dressed by the laser field in a nonperturbative manner by choosing the Volkov solutions in both the initial and final channels. The space part of the scattering wave function for the electron is solved numerically by taking into account the electron exchange. The laser-assisted differential and total cross sections are calculated for single-photon absorption or emission and no-photon exchange in the soft photon limit, the laser intensity being much less than the atomic field intensity. The calculations have been carried out for various values of Debye parameter, ranging from 0.005 to 0.12. A strong suppression is noted in the laser-assisted cross sections as compared to the field-free situation. A significant difference is noted for the singlet and triplet cross sections. The suppression is much more in the triplet states.
    Keywords: Plasma Physics
    Type: GSFC-E-DAA-TN6953 , Physical Review; 86; 5; 053421
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