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  • 1
    Electronic Resource
    Electronic Resource
    Observations of radial wild cables in tokamak plasmas (abstract) : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 506-506 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The results of processing the plasma images with the help of the method of multilevel dynamical contrasting (MDC)1 are presented. The images are taken in visible light, with space resolution ∼100 μm and time resolution ∼10 μs, in various tokamaks (TM-2, T-4, T-6, and T-10). The presence of rigid-body filamentary structures is found. They are similar to those structures formerly found in a Z-pinch, whose long life was proven2 in tracing their dynamics. The reliability of results is supported by the rich statistics and considerable similarity of the structures in various facilities and regimes, as well as by the insensitivity of observed structuring to a specific way of imaging (strick camera, fast photography, etc.). Sometimes the structuring may be seen without MDC processing (in such cases, the MDC allows fine resolution of structuring). The most typical structure is a straight cylindrical block varying in length from few centimeters up to a diameter of plasma column. The diameter of such a block varies, respectively, from a few millimeters to several centimeters. The most attention is paid to radially directed filaments which, together with toroidal and poloidal filaments, form a network. Detailed analysis of individual cylindrical blocks of several centimeters in diameter revealed them to be a coaxial tubular structure with an inner rod (which may be of tubular form as well) of a few millimeters diameter. The similarity of the above structures to coaxial cables may appear to not be occasional: according to the hypothesis3 the elementary coaxial block of diameter not exceeding few millimeters, is a "wild cable" in which the propagating high-frequency (HF) electromagnetic wave produces a vacuum channel around the hypothetical microsolid skeleton2 and thus protects the skeleton from the ambient high-temperature plasma. An analysis of measurements of HF electric fields, both inside and outside the plasma column in tokamak T-10, reveals their reasonable agreement with predictions based on the hypothesis.3 © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1323474
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  • 2
    Electronic Resource
    Electronic Resource
    Plasma networking in magnetically confined plasmas and diagnostics of nonlocal heat transport in tokamak filamentary plasmas (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1392-1396 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The method of multilevel dynamical contrasting is applied to analyzing available data from tokamak plasmas. The results illustrate a possibility of extending the concept of the plasma percolating networks in dense Z pinches (and other inertially confined plasmas) to the case of magnetically confined plasmas. This extension suggests a necessity to append the conventional picture of the nonfilamentary plasma (which is nearly a fluid described by conventional magnetohydrodynamics) with a "network" component which is formed by the strongest long-living filaments of electric current and penetrate the "fluid" component. Signs of networking are found in visible light and soft x-ray images, and magnetic probing data. A diagnostic algorithm is formulated for identifying the role of plasma networking in observed phenomena of nonlocal (non-diffusive) heat transport in a tokamak. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149577
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  • 3
    Electronic Resource
    Electronic Resource
    Self-similarity of plasma networking in a broad range of length scales: From laboratory to cosmic plasmas (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1387-1391 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A newly developed method of high-resolution processing, called a method of multilevel dynamical contrasting, is applied to analyze numerous data from laboratory electric discharges and observations of cosmic plasmas in a broad spectroscopic range from rf to soft x-ray images. A high degree of self-similarity of plasma structuring is found in a very broad range of length scales, from individual filaments in laboratory discharges to the structures in the universe, which resemble electric currents networking in laboratory plasmas. The results presented illustrate recently suggested [Kukushkin and Rantsev-Kartinov, Laser Part. Beams 16, 445 (1998)] generic features of networking in plasmas: (1) long-living (nonfluctuative) filamentation of electric current; (2) formation of a fractal structure made of single filament and complicated interaction of these "fractal" filaments; (3) formation of a percolating network that includes, in particular, formation of the "stockings" woven by the individual filaments. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149576
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  • 4
    Electronic Resource
    Electronic Resource
    Observations of a dynamical percolating network in dense Z-pinch plasmas (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1421-1424 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The method of multilevel dynamical contrasting [A. B. Kukushkin and V. A. Rantsev-Kartinov, Laser Part. Beams 16, 445 (1998)] is applied to analyzing earlier Z-pinch experiments. The results suggest Z-pinch plasmas to be a dynamical percolating network formed by the long-living filaments of electric current. The probable role of filamentation and networking of filaments is analyzed for the following phenomena: (1) formation of a "stocking" woven by the individual filaments, from the very beginning of discharge; (2) formation of an electric current precursor on axis, in advance of the convergence of the major current sheath; (3) fine structuring of the Z-pinch's main body and halo at stagnation stage; (4) development and saturation of the magnetically driven Rayleigh–Taylor instability in the filamentary current sheath; (5) disruption of the necks in the filamentary Z pinch; (6) fine structure of "hot spots." © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149579
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  • 5
    Electronic Resource
    Electronic Resource
    Observations of radial wild cables in z-pinch plasma (abstract) : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 507-507 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The results of processing the z-pinch plasma images with the help of the method of multilevel dynamical contrasting (MDC)1(a),1(b) are presented. This method was earlier used for: (i) analyzing the filaments (and their networks) in a gaseous z-pinch1(a),1(c) and (ii) characterization of long-living filaments2 of the lifetime comparable with the entire duration of discharge. The original images were taken in visible light, with space resolution ∼100 μm and time resolution ∼2–60 ns. The long-life structures are found, which are assembled from straight cylindrical blocks varying in length from a few millimeters to a few centimeters. Such blocks are of various orientation in space, and often they form a common frame. The most important phenomenon is the presence of radial (with respect to z-pinch axis) filaments directed from the periphery to the core, up to the z-pinch axis. An analysis of the fine structure of the above cylindrical blocks of few millimeter diameter reveals them to be a coaxial structure with the diameter of an inner rod (which may be of tubular form) approximately smaller by an order of magnitude. A comparison is made with similar structures recently observed in tokamak plasmas.3(a) The reliability of the above results is supported by the rich statistics and considerable similarity of the structuring in various regimes, and insensitivity to specific way of imaging. Sometimes the structuring may be seen without MDC processing (in such cases, the MDC allow fine resolution of structuring). The experimental results are analyzed from the viewpoint of the hypothesis3 about "wild cables" in plasmas of high-current electric discharges. The correlation is found between the measured values of the high-frequency electric fields in z-pinch plasma and the values of the Miller force needed to sustain vacuum channels in the plasma which are the essential elements of the wild cable © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1323475
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  • 6
    Electronic Resource
    Electronic Resource
    Efficiency of conversion of heat flux into hard x rays (1997)
    Springer
    JETP letters 65 (1997), S. 522-527 
    Details
    ISSN: 1090-6487
    Keywords: 52.25.Nr ; 52.55.Ez
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The efficiency of conversion of the heat flux into hard x radiation (HXR) is analyzed, via time-dependent two-temperature one-dimensional non-LTE-radiation-hydrodynamic numerical modeling, for a heat-to-radiation flux converter linked to the edge of a low-atomic-number hot Z-pinch. The domain of parameters in this scheme is found where about the same HXR yield can be achieved at values of input energy which are an order of magnitude lower than in the conventional scheme of a radially imploding plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567392
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  • 7
    Electronic Resource
    Electronic Resource
    Multiphoton static and polarization bremsstrahlung in collisions of charged particles with multiply-charged ions in a strong laser field (1997)
    Springer
    Journal of experimental and theoretical physics 84 (1997), S. 229-240 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A universal analytic description of multiphoton bremsstrahlung, including the static and polarization bremsstrahlung channels, in the collision of charged particles with multiply-charged ions is obtained on the basis of a specified quantum/classical current for arbitrary “quantum/classical” motion of the incident particle. For the description of stimulated polarization bremsstrahlung, the method of equivalent Fermi photons and the Kramers electrodynamics method [V. I. Kogan, A. B. Kukushkin, and V. S. Lisitsa, Phys. Rep. 213, 1 (1992)] are generalized to multiphoton processes. The resulting description of stimulated polarization bremsstrahlung is valid over a broad range about resonance, where its contribution is the most significant. The regions of polarization predominance over the static channel are indicated, and examples of interaction between the static and polarization channels are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558110
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  • 8
    Electronic Resource
    Electronic Resource
    Qualitative models of the enhanced-rate propagation of a magnetic field in a plasma due to the Hall effect (2000)
    Springer
    Plasma physics reports 26 (2000), S. 428-438 
    Details
    ISSN: 1562-6938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two qualitative electron magnetohydrodynamic models are developed of an enhanced-rate (in comparison with ordinary diffusion) propagation of a magnetic field in a plasma due to the Hall effect. The first model is based on a simple hydrodynamic approach, which in particular makes it possible to reproduce some familiar results. The second model provides an exact analytic description of the main global parameters of the enhanced-rate propagation of a magnetic field in an isothermal inhomogeneous plasma: the front velocity of the magnetic field and the effective front width.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.952875
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