Table of Contents
ISRN High Energy Physics
Volume 2012, Article ID 838394, 10 pages
http://dx.doi.org/10.5402/2012/838394
Research Article

The Effect of Energy Leakage Probability on Burn Propagation in an Optically Thick Fusion Plasma

1Physics Department, Mazandaran University, P.O. Box 47415-416, Babolsar, Iran
2Physics Department, Faculty of Sciences, Golestan University, Shahid Beheshti Street, P.O. Box 155, Gorgan, Iran

Received 3 October 2012; Accepted 4 November 2012

Academic Editors: S. Alexeyev, A. Belhaj, F.-H. Liu, and Z. H. Xiong

Copyright © 2012 M. Mahdavi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In an optically thick plasma, the mean free path of bremsstrahlung photons is smaller than the plasma radius, and radiation can be treated as a photon gas in thermal equilibrium. In these conditions, the black body radiation spectrum exceeds the number of hot photons, and reabsorption processes such as inverse bremsstrahlung radiation and inverse Compton scattering become important. It has been shown that a dense fusion plasma like the one being used in ICF method is initially optically thick. When the fuel pellet is burning, the temperature of its electrons rises (approximately greater than 90 KeV), and the pellet becomes rapidly optically thin. In this paper, we have shown that the energy leakage probability makes electron temperature remain low (approximately smaller than 55 KeV), and as a result the fuel pellet remains optically thick during burning.