AIP Advances
(Jun 2020)
Electron temperature and soft x-ray intensity scaling in laser heavy element plasma interaction
Hiromu Kawasaki,
Atsushi Sunahara,
Yuta Shimada,
Takeo Ejima,
Weihua Jiang,
Gerry O’Sullivan,
Masaharu Nishikino,
Shinichi Namba,
Takeshi Higashiguchi
Affiliations
Hiromu Kawasaki
Department of Electrical and Electronic Engineering, Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan
Atsushi Sunahara
Center for Materials Under Extreme Environment (CMUXE), School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Yuta Shimada
Department of Electrical and Electronic Engineering, Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan
Takeo Ejima
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan
Weihua Jiang
Department of Electrical Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
Gerry O’Sullivan
School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
Masaharu Nishikino
Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology (QST), Kizugawa, Kyoto 619-0215, Japan
Shinichi Namba
Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8527, Japan
Takeshi Higashiguchi
Department of Electrical and Electronic Engineering, Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan
DOI
https://doi.org/10.1063/5.0009946
Journal volume & issue
Vol. 10,
no. 6
Abstract
Read online
We achieved a relative optically thin state in laser-produced heavy element plasmas at determined electron temperatures, which has been predicted by power balance and collisional-radiative models. We also mapped the power-loss processes in sub-nanosecond and nanosecond laser-produced high-Z plasmas. The electron temperature evaluation was in good agreement with the power balance model and was supported by the spectral analysis. The output flux in the soft x-ray region was stronger at a higher critical density.
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