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  • 1990-1994  (3)
  • 1980-1984  (1)
  • 1
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using different optical diagnostic methods, namely interferometric holography and shadowgraphy, and utilizing a piezoelectric transducer for precise velocity determination, the laws of reflection and transmission of laser-driven shock waves through an obstacle in water are studied. Experimental results on the velocity of transmitted and reflected shock waves from different materials are reported.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1572-9591
    Keywords: Spherical pinch ; inertial confinement fusion ; shock wave compression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In the spherical pinch scheme, the hot D-T plasma produced in the center of the high pressure spherical vessel is confined by means of imploding shock waves launched from the periphery of the vessel for a time sufficiently long to achieve break-even conditions for plasma fusion. Theoretical studies on spherical pinch made so far have been limited up to the conditions of substantial expansion of the central plasma and the well-defined time delay between the creation of central plasma and the launching of the peripheral shock which led to the conclusion that, in realistic situations of SP experiments, negative time delays should be adopted, i.e., the launching of the imploding shock wave should precede the formation of the central plasma. However, the interaction of converging shock wave with the central plasma causing an additional heating and compression of the central plasma favoring plasma fusion conditions was not taken into account. Starting from the hydrodynamic equations of the system, the proposed simulation code deals with the propagation of converging shock waves and its interaction with the expanding central plasma. Considering the above-mentioned interaction in a self-consistent manner, the temporal evolution of temperature of central plasma is studied. Some results of the numerical simulation on the dynamics of shock wave propagation are also compared with the predictions of “point strong explosing theory.”
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-9591
    Keywords: Spherical pinch ; inertial confinement fusion ; shock wave propagation ; radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract In the spherical pinch scheme, the temperature of central D-T plasma must reach the value,T=2.58 kev and the density of central D-T plasma is also not very high. The radiation energy and pressure cannot be neglected. Taking into account the influence of the radiation, the present study reveals the new scaling laws under the conditions of high temperature radiation hydrodynamics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 1 (1982), S. 655-665 
    ISSN: 0392-6737
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono stati studiati gli effetti prodotti da un'onda convergente che si propaga attraverso un plasma. I dati sperimentali forniscono delle prime indicazioni sull'interazione di un'onda d'urto debole convergente con un plasma piuttosto inomogeneo, di densità intermedia (≃1018 cm−3), alla temperature di qualche eV. È stato riscontrato che la maggior parte dell'energia dell'onda convergente è spesa per la ionizzazione degli strati esterni e piú freddi del plasma. Nell'idrogeno l'energia residua dell'onda d'urto produce un rallentamento nel raffreddamento naturale del plasma, mentre nell'elio la piú bassa temperature iniziale e le piú alte energie di ionizzazione impediscono il manifestarsi di apprezzabili effetti di temperatura.
    Abstract: Резюме Исследуются эффекты, возникающие при прохождении сходящейся ударной волны через плазму. Эксперименталъные данные обнаруживают взаимодействие слабой сходящейся ударной волны с достаточно неоднородной плазмой с плотностъю (∼1018 см−3) при температуре в несколъко эВ. Обнаружено, что болъщая частъ энергии сходящейся ударной волны затрачивается на ионизацию холодных внешинх слоев плазмы. В водороде оставщаяся энергия ударной волны затрачивается на замедление в процессе естественного адиабатического охлаждения плазмы, тогда как в гелии более низкая температура и более высокие энергии ионизации препятствуют заметному температурному эффекту.
    Notes: Summary We tested the effects produced by a converging shock wave propagating through a plasma. Experimental data gave the first indications on the interaction of a weak converging front with a fairly inhomogeneous, intermediate-density (∼1018 cm−3) plasma at a temperature of few eV. It is found that most of the energy of the converging shock wave is devoted to the ionization of the cold external layers of the plasma. In hydrogen the residual shock energy produced a stop in natural adiabatic cooling, while in helium the lower temperature and the higher ionization energies avoided any appreciable temperature effect.
    Type of Medium: Electronic Resource
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