Showing papers by "Tadashi Sekiguchi published in 1977"
TL;DR: In this article, the steady state energy distribution function of alpha (α)-particles is derived in an analytical form by directly solving the Fokker-Planck (FP) equation in an approximate manner under the assumption that the functional dependence of the α-particle confinement time τα(E) on its energy is given by ταE ∝ E-l (l is a constant).
Abstract: The steady-state energy distribution function of alpha (α)-particles is derived in an analytical form by directly solving the Fokker-Planck (FP) equation in an approximate manner under the assumption that the functional dependence of the α-particle confinement time τα(E) on its energy is given by τα(E) ∝ E-l (l is a constant). In addition, a new retardation theory is proposed on the basis of the FP equation under the same assumption. Finally, this proposed retardation theory is applied to dynamic problems of an α-particle-heated DT-reactor through the introduction of what is called a "dynamic response (matrix) function", the result of which enables us to discuss quantitatively problems such as thermal instability and control without numerical analysis of the FP equation.
10 citations
TL;DR: In this paper, a simplified theoretical model for laser-produced spherical plasma during the laser heating period is proposed mainly from the application viewpoints, where attention is paid to the time variation of the cut-off density surface, the plasma temperature and the transparency time for laser light, and these quantities are obtained in analytical forms for given parameters.
Abstract: A simplified theoretical model for laser-produced spherical plasma during the laser heating period is proposed mainly from the application viewpoints. Attentions are paid to the time variation of the cut-off density surface, the plasma temperature and the transparency time for laser light, and these quantities are obtained in analytical forms for given parameters. The analytical results are compared with those obtained from numerical analyses based upon a spherically symmetric, one-dimensional Lagrangian hydrodynamic code (one-fluid, two-temperature). These two are found to be in good agreement, irrespective of the rather crude assumptions made in the analytical treatments. Thus, our simple theoretical model appears to serve to explain the approximate gross properties of laser-produced plasma during the laser heating phase.
1 citations