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  • 1
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    Can a Penning ionization discharge simulate the tokamak scrape-off plasma conditions? (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The tokamak scrape-off (the region between the vacuum vessel wall and the magnetically confined fusion plasma edge), represents a source/sink for the hot fusion plasma. The electron densities and temperatures are in the ranges 10 to the 11th - 10 to the 13th/cu cm and 1-40 eV, respectively (depending on the size, magnetic field intensity and configuration, plasma current, etc). In the work reported, the electron temperature and density have been estimated in a Penning ionization discharge by comparing its spectroscopic emission in the VUV with that predicted by a collisional radiative model. An attempt to directly compare this emission with that of the tokamak edge is briefly described.
    Keywords: PLASMA PHYSICS
    Type: Physica Scripta (ISSN 0031-8949); 41; 4, Ap
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  • 2
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    Photoionization of sodium atoms and electron scattering from ionized sodium (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The polarized-orbital method of Temkin (1957) is applied using polarized orbitals determined from Sternheimer's equation to compute the photoionization cross sections of Na atoms from threshold to about 60 eV. The approximations involved in the analysis are explained in detail; the explicit forms of the integrals and matrix expressions are given in appendices; and the results are presented in tables and graphs. Good agreement is found with the results of Chang and Kelly (1975), and the possibility that small amounts of molecular vapor in Na-photoionization experiments are responsible for the discrepancies between calculated and measured cross sections is considered.
    Keywords: PLASMA PHYSICS
    Type: Physical Review A - General Physics, 3rd Series (ISSN 0556-2791); 31; 759-771
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  • 3
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    Use of generalized population ratios to obtain Fe XV line intensities and linewidths at high electron densities (1980)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A generalized method for obtaining individual level population ratios is used to obtain relative intensities of extreme ultraviolet Fe XV emission lines in the range 284-500 A, which are density dependent for electron densities in the tokamak regime or higher. Four lines in particular are found to attain quite high intensities in the high-density limit. The same calculation provides inelastic contributions to linewidths. The method connects level populations and level widths through total probabilities t(ij), related to 'taboo' probabilities of Markov chain theory. The t(ij) are here evaluated for a real atomic system, being therefore of potential interest to random-walk theorists who have been limited to idealized systems characterized by simplified transition schemes.
    Keywords: PLASMA PHYSICS
    Type: Physical Review A - General Physics; vol. 22
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  • 4
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    Atomic data and level populations of highly ionized Ti for tokamak plasmas (1980)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The paper presents calculations of electron impact collision strengths and spontaneous radiative decay rates for titanium ions of the LiI through FI isoelectronic sequences for transitions between levels of the 2S(2)2p(k), 2s2p(k+1), and 2p(k+2) configurations. From these atomic data, excitation-rate coefficients are calculated along with level populations for these three configurations. The calculations of level populations include the effects of proton excitation, and are carried out at electron temperatures and densities typical of tokamak plasmas. Wavelengths of forbidden and intersystem lines are given, and a synthetic spectrum is presented for a typical temperature and density.
    Keywords: PLASMA PHYSICS
    Type: Journal of Applied Physics; 51; Mar. 198
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  • 5
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    Electron-impact excitation of Li II in the distorted-wave approximation (1980)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The 1(1)S yields 2(3)P electron-impact-excitation cross section for Li II is calculated in the distorted-wave approximation. Two forms of the distorted-wave method are examined; in the first form both the initial and final wave functions are distorted, while in the second form only the initial wave function is distorted. In both forms a partial-wave expansion of the scattered amplitude is made, and exchange is incorporated in a consistent manner. The effects of including more than one configuration in the target-state wave function are also examined. For incident energies greater than 90 eV, distorted-wave calculations agree moderately well with recent experimental and theoretical results.
    Keywords: PLASMA PHYSICS
    Type: Physical Review A - General Physics; vol. 22
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  • 6
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    Forbidden line emission from highly ionized atoms in tokamak plasmas (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Considerable interest in the observation of forbidden spectral lines from highly ionized atoms in tokamak plasmas is related to the significance of such observations for plasma diagnostic applications. Atomic data for the elements Ti Cr, Mn, Fe, Ni, and Kr have been published by Feldman et al. (1980) and Bhatia et al. (1980). The present investigation is concerned with collisional excitation rate coefficients and radiative decay rates, which are interpolated for ions of elements between calcium, and krypton and for levels of the 2s2 2pk, 2s 2p(k+1), and 2p(k+2) configurations, and for the O I, N I, C I, B I, and Be I isoelectronic sequences. The provided interpolated atomic data can be employed to calculate level populations and relative line intensities for ions of the considered sequences, taking into account levels of the stated configurations. Important plasma diagnostic information provided by the forbidden lines includes the ion temperature
    Keywords: PLASMA PHYSICS
    Type: Journal of Applied Physics; 53; Dec. 198
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  • 7
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    Spectroscopy and atomic physics of highly ionized Cr, Fe, and Ni for tokamak plasmas (1980)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The paper considers the spectroscopy and atomic physics for some highly ionized Cr, Fe, and Ni ions produced in tokamak plasmas. Forbidden and intersystem wavelengths for Cr and Ni ions are extrapolated and interpolated using the known wavelengths for Fe lines identified in solar-flare plasmas. Tables of transition probabilities for the B I, C I, N I, O I, and F I isoelectronic sequences are presented, and collision strengths and transition probabilities for Cr, Fe, and Ni ions of the Be I sequence are given. Similarities of tokamak and solar spectra are discussed, and it is shown how the atomic data presented may be used to determine ion abundances and electron densities in low-density plasmas.
    Keywords: PLASMA PHYSICS
    Type: Journal of Applied Physics; 51; Jan. 198
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  • 8
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    Quasi-projection-operator calculation of autoionization states of O5/+/ /O VI/ and Si11/+/ /Si XII/ (1980)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A practical approach to calculating diagnostic parameters includes both scattering and statelike (autoionization) elements. The paper presents inelastic quasi-projection-operator calculations of autoionization states of the three-electron ions of oxygen and silicon for states below the n = 3 manifod of the respective two-electron parent (O VI and Si XII). Wave functions containing up to 40 configurations are calculated. The O VI calculated results agree with experimental results within the experimental error (about + or - 2 eV) while for the Si XII case, it was necessary to include relativistic effects. Where formulas are available (states for which p + q = 2), the Si XII results are also in good agreement with experimental results for 2Se, 2Po, and 2De states. Since the calculated results for some of the higher states did not agree with identifications proposed by Trabert et al. (1979), alternative identifications are suggested.
    Keywords: PLASMA PHYSICS
    Type: Physical Review A - General Physics; vol
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  • 9
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    Density sensitive X-ray line ratios in the Be I, B I, and Ne I isoelectronic sequences (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The intensities of X-ray transitions in highly charged ions in the Be I, B I, and Ne I isoelectronic sequences have been calculated as functions of electron density. The intensities of the transitions from the 2s(n)2p(m)3p configuration, relative to the intensities from the 2s(n)2p(m)3s and 2s(n)p(m)3d configurations, are strong functions of electron density in high-density plasmas. The density sensitivity occurs at electron densities between 10 to the 16th/cu cm (for Si ions) and 10 to the 22nd/cu cm (for Kr ions). Opacity is unimportant for plasma dimensions that are characteristic of dense laser-produced plasmas. These X-ray line ratios represent a promising new density diagnostic for high-density plasmas.
    Keywords: PLASMA PHYSICS
    Type: Journal of Applied Physics (ISSN 0021-8979); 58; 3954-395
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  • 10
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    On the observability of forbidden lines (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The disappearance of forbidden lines for O III at intermediate plasma densities may be due to background wing emission of the stronger allowed lines, rather than to Stark broadening of the forbidden lines as suggested recently. The general conclusion is supported that the classical explanation of quenching is erroneous, at least for O III.
    Keywords: PLASMA PHYSICS
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 29; April 19
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