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  • 1
    Electronic Resource
    Electronic Resource
    Study of the power exhaust and the role of impurities in the Torus Experiment for Technological Oriented Research (TEXTOR) (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 2272-2280 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Controlled application of radiating impurities in the boundary layer can help to solve the problem of power exhaust in a fusion reactor. Experiments in the Torus Experiment for Technological Oriented Research (TEXTOR) [J. Nucl. Mater. 145–147, 3 (1987)] are presented, which show that impurities with sufficiently high atomic number (≥10) are well suited for this purpose. Injection of neon, a gas recycled at the wall, enabled the establishment of a quasistationary radiating boundary layer, from which more than 90% of the input power was emitted. The required neon density was established by means of a feedback control for the neon influx, which was made possible by the toroidal pump limiter Advanced Limiter Technology (ALT-II) [J. Nucl. Mater. 162–164, 115 (1989)]. Alternatively, or in addition silicon was introduced as a condensing element—either by surface reactions from siliconized walls or by silane [SiH(D)4] injection—which revealed self-controlling mechanisms effective with changing plasma parameters. In neither case was a significant increase in central impurity concentration observed and good energy confinement time was maintained up to the highest plasma densities. Based on the information from various refined edge diagnostics, the underlying mechanisms for the buildup of a radiating plasma mantle and the interdependences of neon and silicon on other impurities are discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871488
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  • 2
    Electronic Resource
    Electronic Resource
    On threshold of radial detachment in tokamaks (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 2432-2438 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The threshold for radial plasma detachment in limiter tokamaks is theoretically investigated. It is shown by taking into account of realistic boundary conditions at the last closed magnetic surface that detachment can start at a radiation level significantly lower than the input power as it occurs in experiments. The origin of contradictions between previous approaches to the problem is clarified. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874082
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  • 3
    Electronic Resource
    Electronic Resource
    A possible nature of "breathing" plasmas (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4357-4359 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model for "breathing" plasmas observed in the large helical device [Y. Takeiri et al., Plasma Phys. Controlled Fusion 42, 147 (2000)] is proposed. It takes into account the synergism of radiation losses from both low-Z (carbon, oxygen) and high-Z (iron) impurities in the plasma power balance. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1311804
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  • 4
    Electronic Resource
    Electronic Resource
    Consideration of multifaceted asymmetric radiation from the edge (MARFE) as a dissipative structure (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1646-1653 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Multifaceted asymmetric radiation from the edge (MARFE) is considered as an example of dissipative structures which develop under critical conditions in different physical and technical systems. The model proposed results in a system of algebraic equation including a relation similar to Maxwell's Rule that determines such characteristic parameters as the plasma temperature in MARFE, its extent in poloidal and radial directions. Predictions of this approximate approach are compared with the results of one- and two-dimensional numerical simulations. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1468233
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  • 5
    Electronic Resource
    Electronic Resource
    On the importance of parallel heat conduction and magnetic geometry for multifaceted radiation from the edge (MARFE) (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 2866-2871 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An importance of parallel heat conduction in plasma for formation of multifaceted radiation from the edge (MARFE) is assessed analytically by taking into account the magnetic geometry of the tokamak. It is demonstrated for circular nonconcentric due to Shafranov shift magnetic surfaces that toroidally symmetric perturbations of a MARFE-like structure with a maximum at the high-field side have the largest growth rate. Both the threshold and characteristic poloidal width of these perturbations depend essentially on plasma parallel heat conduction and geometric characteristics. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1372178
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  • 6
    Electronic Resource
    Electronic Resource
    Recent progress toward high performance above the Greenwald density limit in impurity seeded discharges in limiter and divertor tokamaks : The 42nd annual meeting of the division of plasma physics of the American Physical Society and the 10th international congress on plasma physics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 2188-2198 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An overview is given of recent advances toward the realization of high density, high confinement plasmas with radiating mantles in limiter and divertor tokamaks worldwide. Radiatively improved mode discharges on the Torus Experiment for Technology Oriented Research 94 (TEXTOR-94) [Proceedings of the 16th IEEE Symposium on Fusion Engineering, 1995 (Institute for Electrical and Electronics Engineers, Piscataway, NJ, 1995), p. 470] have recently been obtained at trans-Greenwald densities (up to n¯/nGW=1.4) with high confinement mode free of edge localized modes (ELM-free H-mode) confinement quality. Experiments in DIII-D [J. Luxon et al., Proceedings of the 11th IAEA Conference on Plasma Physics and Controlled Nuclear Fusion Research (International Atomic Energy Association, Vienna, 1987), Vol. 1, p. 159] divertor plasmas with a low confinement mode edge have confirmed the dramatic changes in confinement observed with impurity seeding on TEXTOR-94. Recent experiment with impurity seeding on the Joint European Torus [Rebut et al., Fusion Eng. Des. 22, 7 (1993)], and the Japanese Atomic Energy Research Institute Tokamak 60 Upgrade [Horiike et al., Fusion Eng. Des. 16, 285 (1991); Hosogane et al., Proceedings of the 16th IAEA Conference on Plasma Physics and Controlled Nuclear Fusion Research Montreal, 1987 (International Atomic Energy Association, Vienna, 1987), Vol. 3, p. 555] have extended high confinement in ELMy H-mode plasmas to higher densities. Finally, recent progress in the physical understanding of radiating mantle plasmas is summarized. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1364513
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  • 7
    Electronic Resource
    Electronic Resource
    On transport, in particular of impurities, in a stochastic magnetic field (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 2808-2815 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transport coefficients in a stochastic magnetic field are computed by taking into account analytical relationships for the distribution of plasma parameters along divergent lines of force. In the case of impurities, in contrast to what was believed before, stochastization primarily influences their convection but not their diffusive motion. At the plasma periphery, this convection is mainly caused by friction with the flow of background particles sustained by recycling and is directed toward the plasma boundary. This leads to an enhancement of the impurity exhaust, which provides a plausible explanation for the plasma decontamination observed in tokamaks with peripheral stochastic layers. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873238
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  • 8
    Electronic Resource
    Electronic Resource
    The divisional scientific and technical information system for power and electrification (1970)
    Springer
    Power technology and engineering 4 (1970), S. 357-359 
    Details
    ISSN: 1570-1468
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02378344
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  • 9
    Electronic Resource
    Electronic Resource
    Analytical solution to the problem of heat interaction of fluid flow and solid filling (1996)
    Springer
    Heat and mass transfer 32 (1996), S. 45-48 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung  Auf analytischem Wege, unter Zugrundelegung des ODTPM-Modells, gefundene Ergebnisse für das Problem der thermischen Wechselwirkung zwischen einer Fluidströmung und darin enthaltenen Feststoffpartikeln werden mitgeteilt. Die Untersuchung bezieht sich auf das nichtstationäre Verhalten der volumengemittelten Feststofftemperatur – welche ein Maß für die Effektivität des Wärmeübergangs zwischen fluider und fester Phase ist – und das der Wärmeträgertemperatur am Austritt der Schicht. Diese, aus den analytisch gefundenen Beziehungen für verschiedene Kombinationen der Systemparameter errechneten Zeitabhängigkeiten stimmen gut mit den rein numerisch eruierten Ergebnissen nach [1] überein. Die mitgeteilte Lösung erweitert die Möglichkeit zur genaueren Untersuchung des Zweiphasensystems Fluid/Feststoff und kann ferner bei der Entwicklung von Methoden zur experimentellen Bestimmung von Systemparametern dienlich sein.
    Notes: Abstract  The results of analytical solution to the problem of thermal interaction of a fluid stream with a media of solid particles found on the basis of the ODTPM model [1] are presented. A non-stationary behaviour of the volume-averaged temperature of solid filling, being a measure of the efficiency from heat transfer between fluid and solid phases, and of the heat-carrier temperature at the exit of the layer is studied. Time dependences computed according to the obtained relationships are in good agreement with the results of numerical calculations [1] for different sets of the problem parameters. The found solution expands the possibilities to analyze the efficiency of the “fluid-solid phase” systems and can be a basis to develop methods of experimental evaluation of different parameters of the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050089
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  • 10
    Electronic Resource
    Electronic Resource
    A turbulent plasma blanket (1978)
    Springer
    Atomic energy 44 (1978), S. 384-387 
    Details
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01124415
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