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論文

Temporal behavior of unresolved transition array emission in water window soft X-ray spectral region from multiply charged ions

Dinh, T.-H.*; 鈴木 悠平*; 荒居 剛己*; Li, B.*; Dunne, P.*; O'Sullivan, G.*; 藤岡 慎介*; 長谷川 登; 河内 哲哉; 錦野 将元; et al.

Applied Physics Letters, 107(12), p.121101_1 - 121101_5, 2015/09

 被引用回数:4 パーセンタイル:22.79(Physics, Applied)

We have characterized the spectral structure and the temporal history of the laser-produced high-Z multi-charged ion plasmas for the efficient water window soft X-ray sources. Strong unresolved transition array (UTA) emission was observed due to 4d-4f and 4f-5g transitions from Au, Pb, and Bi plasmas in the 280-700 eV photon energy region. The temporal behavior of the emission was essentially similar of that of the laser pulse with a slight delay between different transitions. These results provide feedback for accurate modeling of the atomic processes with the radiative hydrodynamic simulations.

論文

Density and X-ray emission profile relationships in highly ionized high-Z laser-produced plasmas

吉田 健祐*; 藤岡 慎介*; 東口 武史*; 鵜篭 照之*; 田中 のぞみ*; 川崎 将人*; 鈴木 悠平*; 鈴木 千尋*; 富田 健太郎*; 廣瀬 僚一*; et al.

Applied Physics Letters, 106(12), p.121109_1 - 121109_5, 2015/03

 被引用回数:6 パーセンタイル:32.7(Physics, Applied)

We present a benchmark measurement of the electron density profile in the region where the electron density is 10$$^{19}$$ cm$$^{-3}$$ and where the bulk of extreme ultraviolet (EUV) emission occurs from isotropically expanding spherical high-Z gadolinium plasmas. It was found that, due to opacity effects, the observed EUV emission is mostly produced from an underdense region. We have analyzed time-resolved emission spectra with the aid of atomic structure calculations, and find that while the multiple ion charge states around 18+ during the laser pulse irradiation.

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