Nguyen, Duc-Long (1973). Chauffage laser d'un plasma confiné. Mémoire. Québec, Université du Québec, Institut national de la recherche scientifique, Maitrise en sciences de l'énergie, 45 p.
Ce document n'est pas hébergé sur EspaceINRS.Résumé
The heating of a one-dimensional inertially confined plasma by intense laser radiation is considered theoretically. The method of average description is used to describe the interaction. The model is described in chapter II where a technique of linearization of the non-linear differential equation governing the expansion is proposed. The initial and the asymptomatic behavior of the expansion are discussed in chapter III and IV respectively.
For a laser pulse duration tL, provided the power is assumed constant, the heating can be characterized by a dimensionless parameter γL. In addition to its strong dependence on tL, γL is rather very sensitive to the initial thickness, and to a lesser extent, to the initial density and the flux of the incident laser radiation. In general, the heating is more efficient for the lower value of γL. For o < γL < 0.5, the heating can be assumed instant without introducing an appreciable error; in this case the hydrodynamic expansion during the absorption phase can be neglected and the absorbed laser energy appears as thermal energy of the plasma. However, for higher values of γLm the effect of hydrodynamic expansion is important and should be included in order to compute de plasma temperature. Furthermore, the degree of inertial confinement which, up to now, has been considered by others as an arbitrary parameter can be explicitly defined in terms of the experimental parameter involved.
The asymptotic solution which is valid for large time is used to investigate the influence of the laser rise-time on plasma heating. It is found that for a certain range, the laser energy requirement is quite sensitive to the rise-time. By properly choosing the laser pulse rise- time, the energy requirement can be decreased as much as 25%. The maximum radiation flux density is however not very sensitive and increases only slightly. It seems that fast rising laser pulses ae superior as far as flux is concerned but are inferior to slow-rising pulses from the point of view of energy requirement.
| Type de document: | Thèse Mémoire |
|---|---|
| Directeur de mémoire/thèse: | Parbhakar, Kanwal J. |
| Mots-clés libres: | - |
| Centre: | Centre Énergie Matériaux Télécommunications |
| Date de dépôt: | 01 mai 2026 17:25 |
| Dernière modification: | 01 mai 2026 17:25 |
| URI: | https://espace.inrs.ca/id/eprint/17150 |
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