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Journal Articles

Construction of a magnetic bottle spectrometer and its application to pulse duration measurement of X-ray laser using a pump-probe method

Namba, Shinichi*; Hasegawa, Noboru; Kishimoto, Maki; Nishikino, Masaharu; Ishino, Masahiko; Kawachi, Tetsuya

AIP Advances (Internet), 5(11), p.117101_1 - 117101_10, 2015/11

 Times Cited Count:3 Percentile:13.97(Nanoscience & Nanotechnology)

To characterize the temporal evolution of ultrashort X-ray pulses emitted by laser plasmas using a pump-probe method, a magnetic bottle time-of-flight electron spectrometer is constructed. The design is determined by numerical calculations of a mirror magnetic field and of the electron trajectory in a flight tube. The performance of the spectrometer is characterized by measuring the electron spectra of xenon atoms irradiated with a laser-driven plasma X-ray pulse. In addition, as a preliminary experiment, two-color above-threshold ionization (ATI) is conducted, in which xenon atoms are simultaneously irradiated with an X-ray laser pump and an IR laser probe. The correlation in the intensity of the Auger sideband spectra and in the time delay of the two laser pulses yields an X-ray pulse width of 5.7 ps, in good agreement with the value obtained using an X-ray streak camera.

Journal Articles

Enhancement of double auger decay probability in xenon clusters irradiated with a soft-X-ray laser pulse

Namba, Shinichi*; Hasegawa, Noboru; Nishikino, Masaharu; Kawachi, Tetsuya; Kishimoto, Maki; Sukegawa, Kota; Tanaka, Momoko; Ochi, Yoshihiro; Takiyama, Ken*; Nagashima, Keisuke

Physical Review Letters, 99(4), p.043004_1 - 043004_4, 2007/07

 Times Cited Count:32 Percentile:78.04(Physics, Multidisciplinary)

The interaction of large Xe clusters with a soft X-ray laser pulse having a wavelength of 13.9 nm and an intensity of up to 2$$times$$10$$^{10}$$W/cm$$^{2}$$ was investigated using a time-of-flight ion mass spectrometer. It was found that Xe$$^{3+}$$ ions (which result from double Auger decay of 4d vacancies) became the dominant final ionic product with increasing cluster size and X-ray intensity. This is in contrast to the results of synchrotron radiation experiments involving free Xe atoms, in which Xe$$^{2+}$$ is the dominant resultant ion species. Possible mechanisms responsible for the enhancement of the double Auger transition probability in X-ray laser and cluster interaction are discussed.

Journal Articles

Development of a pumping laser system for X-ray laser research

Kawachi, Tetsuya; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Nagashima, Keisuke; Sukegawa, Kota*; Lu, P.; Takahashi, Kenjiro; Namba, Shinichi; Koike, Masato; et al.

Applied Optics, 42(12), p.2198 - 2205, 2003/04

 Times Cited Count:27 Percentile:72.31(Optics)

no abstracts in English

Journal Articles

Gain saturation of nickel-like silver and tin X-ray lasers by use of a tabletop pumping laser system

Kawachi, Tetsuya; Kado, Masataka; Tanaka, Momoko; Sasaki, Akira; Hasegawa, Noboru; Kilpio, A.*; Namba, Shinichi; Nagashima, Keisuke; Lu, P.; Takahashi, Kenjiro; et al.

Physical Review A, 66(3), p.033815_1 - 033815_7, 2002/09

 Times Cited Count:85 Percentile:93.06(Optics)

A silver and tin slab targets were irradiated by a line-focused CPA glass laser light. In this experiment, the laser pulses consisted of two pulses with 4 ps duration, separated by 1.2 ns. Strong amplification in the nickel-like silver and tin x-ray lasers at the wavelengths of 13.9nm and 12.0nm was demonstrated with a pumping energy of 12 J and 14 J, respectively, and gain-saturation behaviors could be seen. A hydro-dynamics simulation coupled with a collisional-radiative model was performed under the present experimental condition, and the calculated result was compared with the experimental results.

Journal Articles

Development of X-ray laser by transient collisional excitation

Nagashima, Keisuke; Kawachi, Tetsuya; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Sukegawa, Kota*; Namba, Shinichi; Tang, H.; Daido, Hiroyuki; Kato, Yoshiaki

Purazuma, Kaku Yugo Gakkai-Shi, 78(3), p.248 - 255, 2002/03

no abstracts in English

Journal Articles

Demonstration of a transient high gain soft X-ray laser for neon-like Argon

Lu, P.; Kawachi, Tetsuya; Suzuki, M.*; Sukegawa, Kota*; Namba, Shinichi; Tanaka, Momoko; Hasegawa, Noboru; Nagashima, Keisuke; Daido, Hiroyuki; Arisawa, Takashi; et al.

Japanese Journal of Applied Physics, Part 2, 41(2A), p.L133 - L135, 2002/02

 Times Cited Count:9 Percentile:38.09(Physics, Applied)

no abstracts in English

Journal Articles

X-ray laser research at Advanced Photon Research Center of JAERI, Kansai

Kado, Masataka; Kawachi, Tetsuya; Tanaka, Momoko; Hasegawa, Noboru; Takahashi, Kenjiro; Namba, Shinichi; Sukegawa, Kota*; Sasaki, Akira; Lu, P.; Tang, H.; et al.

Soft X-Ray Lasers and Applications IV (Proceedings of SPIE Vol.4505), p.54 - 61, 2001/12

no abstracts in English

Journal Articles

Production of highly-charged ions by nitrogen gas target irradiated with ultrashort high-intensity pulse laser

Namba, Shinichi; Kawachi, Tetsuya; Hasegawa, Noboru; Nagashima, Keisuke; Sukegawa, Kota*; Kado, Masataka; Tanaka, Momoko; Daido, Hiroyuki; Kato, Yoshiaki

International Journal of Applied Electromagnetics and Mechanics, 11(1), p.1 - 7, 2000/12

no abstracts in English

Journal Articles

Energy distribution around 175MeV Ar ion path in argon at the density of water

Taguchi, Mitsumasa; Namba, Hideki; Aoki, Yasushi*; Furukawa, Katsutoshi; Ono, Shinichi*

Radiation Physics and Chemistry, 55(5-6), p.511 - 514, 1999/00

 Times Cited Count:4 Percentile:34.88(Chemistry, Physical)

no abstracts in English

Journal Articles

Predicted radiolysis yield in a Fricke solution irradiated with various heavy ions

Ono, Shinichi*; Furukawa, Katsutoshi; Taguchi, Mitsumasa; Namba, Hideki; Watanabe, Hiroshi

Radiation Physics and Chemistry, 55(5-6), p.503 - 506, 1999/00

 Times Cited Count:7 Percentile:49.75(Chemistry, Physical)

no abstracts in English

Journal Articles

Radial dose distribution around a heavy ion's path

Furukawa, Katsutoshi; Ono, Shinichi*; Namba, Hideki; ; Watanabe, Ritsuko*

Radiation Physics and Chemistry, 49(6), p.641 - 644, 1997/00

 Times Cited Count:9 Percentile:59.8(Chemistry, Physical)

no abstracts in English

Journal Articles

Heavy ion beam microdosimetry

Namba, Hideki; Aoki, Yasushi; Furukawa, Katsutoshi; Ono, Shinichi; Komaki, Yoshihide

Dai-4-Kai Tandemu Kasokuki Oyobi Sono Shuhen Gijutsu No Kenkyukai Hokokushu, p.131 - 134, 1991/07

no abstracts in English

Oral presentation

Inner-shell ionization in Xe cluster irradiated with X-ray laser pulse

Namba, Shinichi*; Hasegawa, Noboru; Nishikino, Masaharu; Kawachi, Tetsuya; Kishimoto, Maki; Tanaka, Momoko; Nagashima, Keisuke

no journal, , 

no abstracts in English

Oral presentation

Inner-shell ionization in Xe clusters irradiated with X-ray laser pulse

Namba, Shinichi*; Hasegawa, Noboru; Nishikino, Masaharu; Kawachi, Tetsuya; Kishimoto, Maki; Tanaka, Momoko; Ochi, Yoshihiro; Nagashima, Keisuke; Takiyama, Ken*

no journal, , 

Oral presentation

Recent progress in X-ray laser research in JAEA

Kawachi, Tetsuya; Kishimoto, Maki; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Ochi, Yoshihiro; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Kunieda, Yuichi; et al.

no journal, , 

Recent progress in X-ray laser research in Japan Atomic Energy Agency is reviewed. Using the nickel-like silver soft X-ray laser at the wavelength of 13.9 nm, the application experiments have been conducted in the research fields such as material science, high-density plasma diagnostics, XRL ablation, XRL imaging using single-shot holography and atomic physics. The repetition rate of the XRL beam has been improved from each 10-20 minutes to 0.1 Hz by using new driver laser system with Nd: glass zigzag slab amplifier, and we are now constructing new beam line for the pump-probe measurement of the surface phase-transition by the method of X-ray laser interferometer. In the research activity on the extension of the wavelength region of the X-ray lasers, firstly, the demonstration of novel coherent X-ray generation by "flying mirror" technique is reported. The second is theoretical investigation of the resonance photo-pumping scheme toward water-window region.

Oral presentation

Development and applications of plasma X-ray lasers

Nishikino, Masaharu; Ochi, Yoshihiro; Hasegawa, Noboru; Kawachi, Tetsuya; Ishino, Masahiko; Imazono, Takashi; Tanaka, Momoko; Sato, Katsutoshi; Yamamoto, Minoru; Oba, Toshiyuki; et al.

no journal, , 

Recent Progress in the development of laser-driven plasma soft X-ray laser (XRL) and the applications are presented. In the source development, TOPAZ laser using Nd:glass zigzag slab amplifiers with 10 J, 0.1 Hz repetition-rate routinely provides the fully spatial coherent X-ray laser at 13.9 nm for the applications. The bright, coherent, and picoseconds X-ray pulse can be used in a variety of applications such as X-ray speckle measurement and interferometer for probing materials, diffraction imaging, nano-scale fabrication, radiation biology, and so on. In order to extend the use of XRLs, now we are constructing new XRL beam lines for the optical pump and XRL probe experiment.

Oral presentation

Development and applications of plasma X-ray lasers in JAEA

Nishikino, Masaharu; Hasegawa, Noboru; Ochi, Yoshihiro; Kawachi, Tetsuya; Ishino, Masahiko; Imazono, Takashi; Tanaka, Momoko; Sasaki, Akira; Sato, Katsutoshi; Yamamoto, Minoru; et al.

no journal, , 

no abstracts in English

Oral presentation

Source development of novel coherent X-ray and the applications in JAEA

Kawachi, Tetsuya; Sasaki, Akira; Nishikino, Masaharu; Ishino, Masahiko; Hasegawa, Noboru; Imazono, Takashi; Ochi, Yoshihiro; Tanaka, Momoko; Faenov, A. Ya.*; Pikuz, T.; et al.

no journal, , 

This paper reviews recent progress in the X-ray laser research in JAEA. In the source development, the polarization of the 13.9 nm laser has been investigated experimentally. The result indicates that the output beam is strongly polarized in the direction perpendicular to the target surface. In the alternative schemes toward the shorter wavelength region, intense higher-order harmonics with more than 300 eV has been observed from relativistic plasma generated with the laser intensity higher than 1E19 W/cm$$^{2}$$. Furthermore, theoretical investigations of resonantly photo-pumping scheme using intense K-alpha line and generation of $$gamma$$-ray flash induced by radiation damping effect are also studied. In the application study, the surface dynamics of metal plate irradiated by an optical pulse observed by X-ray laser interferometer, surface deformation induced by a single-shot XRL exposure in which nano-scale conical structures are formed, will be reported.

Oral presentation

Estimation of on-site radionuclides inventories of Fukushima Daiichi NPS based on their off-site distribution, 1; Overview and preliminary research

Iijima, Kazuki; Dohi, Terumi; Niizato, Tadafumi; Fujiwara, Kenso; Koma, Yoshikazu; Suzuki, Shinichi; Oda, Yoshihiro; Omura, Yoshihito*; Sasaki, Takayuki*; Namba, Kenji*

no journal, , 

For the purpose of estimation of radionuclides inventory in the various radioactive solid wastes, such as soils, trees, generated from decommissioning of Fukushima Daiichi Nuclear Power Station (FDNPS), the methodology of estimation of on-site radionuclides inventories is being developed based on the dependency on distance and direction from the FDNPS of their off-site distribution.

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