Abstract:The production of thermonuclear energy by the adiabatic compression of a ß ≫ 1-dense plasma by a cylindrical heavy liner is investigated. Energy yields and compression ratios are optimized as functions of the initial conditions (plasma temperature and nτ-product, liner inertia). D-T α-self–heating is computed by dividing the α-population into a Maxwellian cold part and a flat hot part. High-energy amplification requires α-self-heating and stability of the liner-plasma interface well after the turn-around time.
“…This leads to a factor-4-larger energy investment required to produce break-even conditions. Reference [5] mentions the existence of experimental information from laserdriven implosions which indicates that the imploding shell is more stable than one would expect from the application of RT stability theory. In reviewing the subject of RT growth rates, Suydam [13] at Los Alamos has collated the results of inferred metallic viscosity from many experiments on shock waves in aluminium at high pressures.…”
Section: The Incompressible Linermentioning
confidence: 99%
“…Jablon and Rioux [5] considered an infinitely thin, incompressible liner. They also ignored radial heat trransport losses from the plasma.…”
Adiabatic plasma heating by the implosion of a compressible, cylindrical, end-plugged liner is studied by means of an approximate analytical model and by a computer code that employs sophisticated equation-of-state tables for the metal liner. The model contains cylindrical convergence effects and an approximate but realistic equation-of-state. Analytic expressions are derived for the pressure profile in the liner, for the internal energy of the liner, for the maximized fusion energy output of the enclosed D-T plasma, for the corresponding optimized initial conditions, and for the resulting peak pressure, final radius and thickness, and burn time. In this idealized model that ignores losses, energy transfer efficiencies (liner to plasma) of 70% are found, and a gain of 4 (ratio of fusion energy to liner energy) can occur with an initial liner energy of 300 MJ · m−1. Finally, losses from the plasma are briefly discussed.
“…This leads to a factor-4-larger energy investment required to produce break-even conditions. Reference [5] mentions the existence of experimental information from laserdriven implosions which indicates that the imploding shell is more stable than one would expect from the application of RT stability theory. In reviewing the subject of RT growth rates, Suydam [13] at Los Alamos has collated the results of inferred metallic viscosity from many experiments on shock waves in aluminium at high pressures.…”
Section: The Incompressible Linermentioning
confidence: 99%
“…Jablon and Rioux [5] considered an infinitely thin, incompressible liner. They also ignored radial heat trransport losses from the plasma.…”
Adiabatic plasma heating by the implosion of a compressible, cylindrical, end-plugged liner is studied by means of an approximate analytical model and by a computer code that employs sophisticated equation-of-state tables for the metal liner. The model contains cylindrical convergence effects and an approximate but realistic equation-of-state. Analytic expressions are derived for the pressure profile in the liner, for the internal energy of the liner, for the maximized fusion energy output of the enclosed D-T plasma, for the corresponding optimized initial conditions, and for the resulting peak pressure, final radius and thickness, and burn time. In this idealized model that ignores losses, energy transfer efficiencies (liner to plasma) of 70% are found, and a gain of 4 (ratio of fusion energy to liner energy) can occur with an initial liner energy of 300 MJ · m−1. Finally, losses from the plasma are briefly discussed.
“…Dans les plasmas créés par laser, le rayonnement est emprisonné et le confinement est inertiel [5]. Dans d'autres cas, on utilise l'énergie électrique pour mettre en mouvement implosif un cylindre et créer ainsi un plasma dense thermonucléaire [6]. La méthode du fil explosé [7] produit un plasma difficile à utiliser à cause des problèmes liés à la fusion et à la volatilisation du fil.…”
unclassified
“…exemple, Buneman[21 ] propose :6 N 1 M 1/3 illp où M et m sont les masses respectives des ions et des électrons et 03C9P la fréquence de plasma. Dupree[22] propose la formule 03C3 ~ 10 ffip/kÀD où k est un vecteur d'onde moyen et 03BBD la longueur de Debye.…”
unclassified
“…Cette dépendance diviserait la valeur calculée précédemment par 30 et nous obtiendrions 100 S2-1 cm-1 dans la gamme des valeurs que nous avons déterminées.Le mécanisme de la conduction fait donc intervenir des turbulences microscopiques. Mais il reste à mieux préciser les valeurs expérimentales,6, ne et T pour faire une étude quantitative de ces instabilités.…”
2014 Une méthode de production de plasma dense par explosion de filament gazeux ionisé est décrite. Les résultats des mesures électriques et spectrophotométriques montrent l'efficacité d'une injection rapide de l'énergie dans la colonne de plasma, pour deux expériences de caractéristiques temporelles très différentes.Abstract. 2014 A method for producing a dense plasma by explosion of a thin preionized gaseous filament is described. The electric and spectrophotometric results show the efficiency of a rapid injection of the energy in the plasma column in two experiments which have different durations. REVUE DE PHYSIQUE APPLIQUÉE TOME 12, OCTOBRE 1977, PAGE Classification Physics Abstracts 52.00 -52.50L 1. Introduction. -L'étude théorique des plasmas denses a considérablement progressé ces dernières années. Les diverses méthodes employées : simulation numérique des plasmas à une composante [1], étude du gaz coulombien à deux dimensions [2], thermodynamique statistique [3] permettent le calcul des fonctions thermodynamiques, des états d'ionisation et des coefficients de transport, des plasmas denses à forte corrélation pour lesquels l'énergie d'interaction coulombienne est du même ordre que l'énergie cinétique.Parallèlement, les expérimentateurs ont déployé une grande activité pour produire des plasmas denses et chauds dans la perspective d'applications telles que : générateurs M.H.D., propulsion spatiale, fusion thermonucléaire contrôlée, où l'on prévoit que l'état de plasma dense constituera le fluide de travail. Dans les machines du type Focus [4], le plasma est chauffé électriquement et comprimé magnétiquement dans une configuration non symétrique. Dans les plasmas créés par laser, le rayonnement est emprisonné et le confinement est inertiel [5]. Dans d'autres cas, on utilise l'énergie électrique pour mettre en mouvement implosif un cylindre et créer ainsi un plasma dense thermonucléaire [6]. La méthode du fil explosé [7] produit un plasma difficile à utiliser à cause des pro-
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