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Sasaki, Akira; Nishihara, Katsunobu*; Sunahara, Atsushi*; Nishikawa, Takeshi*
Proceedings of SPIE, Vol.9776, p.97762C_1 - 97762C_6, 2016/03
Times Cited Count：1 Percentile：52.7(Optics)For the improvement of efficiency and output of the laser pumped plasma (LPP) extreme ultra-violet (EUV) light source, we present a hydrodynamics model of laser irradiated Sn targets. The model takes liquid/solid to gas transition and mixed phase condition of the flow into account for the calculation of the distribution of the particles produced by the pre-pulse laser irradiation and optimization of the EUV source. Firstly, we investigate the mechanisms of the fragmentation of the target and particle emission, including the effect of the equation of state of Sn, and secondly, an applicable model is proposed based on the analysis.
Sasaki, Akira; Nishimura, Hiroaki*; Onishi, Naofumi*
Purazuma, Kaku Yugo Gakkai-Shi, 91(2), p.166 - 167, 2015/02
no abstracts in English
Shimada, Yoshinori*; Nishimura, Hiroaki*; Nakai, Mitsuo*; Hashimoto, Kazuhisa*; Yamaura, Michiteru*; Tao, Y.*; Shigemori, Keisuke*; Okuno, Tomoharu*; Nishihara, Katsunobu*; Kawamura, Toru*; et al.
Applied Physics Letters, 86(5), p.051501_1 - 051501_3, 2005/01
Times Cited Count：113 Percentile：94.31(Physics, Applied)no abstracts in English
Nishiuchi, Mamiko; Daido, Hiroyuki; Takabe, Hideaki*; Matsukado, Koji*
Reza Kenkyu, 31(11), p.711 - 720, 2003/11
no abstracts in English
Sasaki, Akira
no journal, ,
In the study of extreme ultraviolet (EUV) light sources, high conversion efficiency is achieved using the double pulse technique; a small tin droplet target is irradiated by the prepulse laser to cause fragmentation of the target to form a cloud small particles or mist, which is heated by the main CO
laser pulse to produce the uniform plasma from which efficient EUV emission is obtained. The fragmentation may be caused due to shock heating driven by the prepulse laser irradiation, which also may bring the target to the warm dense state. In this paper, a new hydrodynamics simulation, which will be used to calculate the temporal and spatial development of tin particles, is proposed. The simulation is based on the two dimensional self-adapting Lagrangian grid. The theory of liquid and gas phase transition in thermodynamic equilibrium, allows one to determine the ratio between gas and liquid phase at given temperature and density.
Sasaki, Akira; Sunahara, Atsushi*; Nishihara, Katsunobu*
no journal, ,
no abstracts in English
Sasaki, Akira
no journal, ,
no abstracts in English
Sasaki, Akira; Sunahara, Atsushi*; Nishihara, Katsunobu*
no journal, ,
For the development of laser plasma pumped (LPP) extreme ultraviolet light (EUV) source, we develop a new hydrodynamics model, which is applicable to the fragmentation of liquid Sn by the pre-pulse laser irradiation. A 2-dimensional Lagrange simulation code with mesh reorganization algorithms as well as phase transition dynamics is developed and initial application to an analysis of the particle formation during the evaporation of a hot Sn droplet is presented.
