New evaluation method is proposed using stochastic model for prediction of plasma fluctuation based on collisional- radiative model. Electron impact excitation of atoms is considered as a Wiener process, which is applied to analyze variation in excited-level populations in short time by Malliavin derivative. Relative entropy and fractional Brownian motion are introduced as indicators to evaluate how far a system is from its steady state, where both trend of entropy and contribution of radiative processes to the lifetime of excited states are taken into account. The high statistical weight of some excited states may act as a bottleneck in the energy relaxation throughout the system to a steady state.
各種検索
サポート
ヘルプ