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Journal Articles

Construction of a collisional radiative model of complex multiple charged ions for mid- to high-Z elements

Sasaki, Akira

High Energy Density Physics, 9(2), p.325 - 335, 2013/06

 Times Cited Count:11 Percentile:50.8(Physics, Fluids & Plasmas)

A method of constructing a compact and complete collisional radiative model of multiple charged ions of mid- to high-Z elements is proposed, for studying radiative properties of the plasmas. The proposed tungsten model, which is based on atomic data calculated by the HULLAC code, incorporates a computer algorithm to identify well-populated atomic states and dielectronic recombination channels that have a significant effect on the ionization balance. The model is validated by investigating the convergence of the mean charge and radiative power loss with respect to the size of the model, and by comparing results with other calculations presented at the nLTE kinetics workshop.

Journal Articles

Atomic physics of relativistic high contrast laser-produced plasmas in experiments on Leopard laser facility at UNR

Safronova, A. S.*; Kantsyrev, V. L.*; Faenov, A. Y.; Safronova, U. I.*; Wiewior, P.*; Renard-Le Galloudec, N.*; Esaulov, A. A.*; Weller, M. E.*; Stafford, A.*; Wilcox, P.*; et al.

High Energy Density Physics, 8(2), p.190 - 195, 2012/06

 Times Cited Count:8 Percentile:38.12(Physics, Fluids & Plasmas)

Journal Articles

Observation and modeling of high resolution spectral features of the inner-shell X-ray emission produced by 10$$^{-10}$$ contrast femtosecond-pulse laser irradiation of argon clusters

Colgan, J.*; Abdallah, J. Jr.*; Faenov, A. Ya.*; Pikuz, T. A.*; Skobelev, I. Yu.*; Fukuda, Yuji; Hayashi, Yukio; Pirozhkov, A. S.; Kawase, Keigo*; Shimomura, Takuya; et al.

High Energy Density Physics, 7(2), p.77 - 83, 2011/06

 Times Cited Count:21 Percentile:70.43(Physics, Fluids & Plasmas)

A study is made of the ultra-short laser pulse irradiation of Ar cluster targets. Experiments have been performed with large cluster sizes and using very high laser contrasts, which have allowed clear and unambiguous observation of exotic inner-shell transitions in near-neutral Ar ions. The interaction of the main laser pulse with the unperturbed target is a necessary requirement for observing these lines. Our measurements are supported by kinetics calculations in which a very detailed atomic model is used. The calculations predict all of the spectral features found experimentally, and support the notion that the X-ray emission arises from many ion stages of the Ar plasma, from near-neutral through He-like ions, and from a range of plasma temperatures and densities.

Journal Articles

Atomic modeling of the plasma EUV sources

Sasaki, Akira; Sunahara, Atsushi*; Furukawa, Hiroyuki*; Nishihara, Katsunobu*; Nishikawa, Takeshi*; Koike, Fumihiro*; Tanuma, Hajime*

High Energy Density Physics, 5(3), p.147 - 151, 2009/09

 Times Cited Count:9 Percentile:36.96(Physics, Fluids & Plasmas)

We study the radiative properties of the EUV source to address conditions to achieve an output power and efficiency required for its application to the next generation microlithography. An atomic model is developed based on the atomic data calculated by Hullac code, which is validated through detailed comparisons with experimental emission and a absorption spectra. The atomic model is improved with respect to the wavelength of the strong emission lines, and the number of satellite channels taken into account. As a result, the radiation hydrodynamics model is shown to successfully reproduce the experiments. We show Sn plasma is more efficient than Xe plasma because of the atomic number dependence of the emission wavelength, and the use of CO$$_{2}$$ lasers as a pumping source has an advantage to reduce satellite contribution and to have narrower emission spectrum to obtain higher conversion efficiency.

Journal Articles

Atomic modeling of the plasma EUV sources

Sasaki, Akira; Sunahara, Atsushi*; Nishihara, Katsunobu*; Nishikawa, Takeshi*; Fujima, Kazumi*; Kagawa, Takashi*; Koike, Fumihiro*; Tanuma, Hajime*

High Energy Density Physics, 3(1-2), p.250 - 255, 2007/05

 Times Cited Count:14 Percentile:48.36(Physics, Fluids & Plasmas)

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