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Journal Articles

High contrast femtosecond laser-driven intense hard X-ray source for imaging application

Chen, L. M.*; Wang, W. M.*; Kando, Masaki; Hudson, L. T.*; Liu, F.*; Lin, X. X.*; Ma, J. L.*; Li, Y. T.*; Bulanov, S. V.; Tajima, Toshiki*; et al.

Nuclear Instruments and Methods in Physics Research A, 619, p.128 - 132, 2010/07

 Times Cited Count:7 Percentile:48.91(Instruments & Instrumentation)

In this report we address the current situation of laser-driven hard X-ray sources for imaging applications, especially the saturation of X-ray conversion efficiency and the serious impact upon imaging quality. By employing high contrast laser pulses, the conversion efficiency to X-rays from solid foil targets is improved and the structure of the spectrum can be optimized with respect to imaging applications. In addition, bright Ar K-shell X-rays with very little continuum background have been generated by irradiating, with an ultra-high contrast laser, a target of Ar gas clusters created by a gas jet. These improvements show great potential for single-shot ultrafast X-ray imaging.

Journal Articles

Intense high-contrast femtosecond $$K$$-shell X-ray source from laser-driven Ar clusters

Chen, L. M.*; Liu, F.*; Wang, W. M.*; Kando, Masaki; Mao, J. Y.*; Zhang, L.*; Ma, J.*; Li, Y. T.*; Bulanov, S. V.; Tajima, Toshiki; et al.

Physical Review Letters, 104(21), p.215004_1 - 215004_4, 2010/05

 Times Cited Count:59 Percentile:9.83(Physics, Multidisciplinary)

Oral presentation

Model intercomparison study for atmospheric $$^{137}$$Cs from the Fukushima Daiichi Nuclear Power Plant Accident using identical input data

Sato, Yosuke*; Takigawa, Masayuki*; Sekiyama, Tsuyoshi*; Kajino, Mizuo*; Terada, Hiroaki; Nagai, Haruyasu; Kondo, Hiroaki*; Uchida, Junya*; Goto, Daisuke*; Qu$'e$lo, D.*; et al.

no journal, , 

An intercomparison of atmospheric dispersion model targeting on the physical process of $$^{137}$$Cs released from the Fukushima Daiichi Nuclear Power Plant was conducted. Twelve atmospheric models participated in this project. To exclude the uncertainties of the model result due to the emission inventory and meteorological data, all models used the same emission and meteorological data. Concentration of $$^{137}$$Cs from the national suspended particle matter monitoring network and the deposition density by the aircraft were used for the comparison between results of the model and observation. Our analyses elucidated the figure of merit in space (FMS) of the model ensemble mean was improved from a previous model intercomparson about the accumulated deposition. The model ensemble mean captured approximately 36% of the observed high concentration. The inter-model spread of the capture rate was from 8% to 38%. It was originated from the difference in deposition and diffusion processes among the models.

Oral presentation

Model intercomparison project for $$^{137}$$Cs from the Fukushima Daiichi Nuclear Power Station Accident using identical meteorological data and source term

Sato, Yosuke*; Takigawa, Masayuki*; Sekiyama, Tsuyoshi*; Kajino, Mizuo*; Terada, Hiroaki; Nagai, Haruyasu; Kondo, Hiroaki*; Uchida, Junya*; Goto, Daisuke*; Qu$'e$lo, D.*; et al.

no journal, , 

no abstracts in English

Oral presentation

Third model intercomparison project for $$^{137}$$Cs from the Fukushima Daiichi Nuclear Power Station Accident

Sato, Yosuke*; Sekiyama, Tsuyoshi*; Sheng, F.*; Kajino, Mizuo*; Qu$'e$lo, D.*; Qu$'e$rel, A.*; Kondo, Hiroaki*; Terada, Hiroaki; Kadowaki, Masanao; Takigawa, Masayuki*; et al.

no journal, , 

no abstracts in English

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