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Journal Articles

Characterization of preformed plasmas using a multi-dimensional hydrodynamic simulation code in the study of high-intensity laser-plasma interactions

Sagisaka, Akito; Utsumi, Takayuki*; Daido, Hiroyuki; Ogura, Koichi; Orimo, Satoshi; Takai, Mamiko; Hayashi, Yukio; Mori, Michiaki; Yogo, Akifumi; Kado, Masataka; et al.

Journal of Plasma Physics, 72(6), p.1281 - 1284, 2006/12

 Times Cited Count:0 Percentile:0.01(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Characterization of preformed plasmas using a hydrodynamic simulation code in the study of high-intensity laser-plasma interactions

Sagisaka, Akito; Utsumi, Takayuki*; Daido, Hiroyuki; Ogura, Koichi; Orimo, Satoshi; Hayashi, Yukio; Takai, Mamiko; Mori, Michiaki; Yogo, Akifumi; Kado, Masataka; et al.

Reza Enerugigaku Kenkyu Senta Heisei-17-Nendo Kyodo Kenkyu Seika Hokokusho (Heisei-17-Nen 4-Gatsu $$sim$$ Heisei-18-Nen 3-Gatsu), p.61 - 62, 2006/07

no abstracts in English

Journal Articles

Solutions of the 1D coupled nonlinear schr$"o$dinger equations by the CIP-BS method

Utsumi, Takayuki*; Aoki, Takayuki*; Koga, J. K.; Yamagiwa, Mitsuru

Communications in Computational Physics, 1(2), p.261 - 275, 2006/04

no abstracts in English

Journal Articles

Solutions of partial differential equations with the CIP-BS method

Utsumi, Takayuki*; Kimura, Hideo

JSME International Journal, Series B, 47(4), p.761 - 767, 2004/11

In this paper, we show that a new numerical method, the Constrained Interpolation Profile - Basis Set (CIP-BS) method, can solve partial differential equations (PDEs) with high accuracy and can be a universal solver by presenting examples for the solutions of typical parabolic, hyperbolic, and elliptic equations. Here, we present the numerical errors caused by this method, and illustrate that the solutions by the CIP-BS$$^{2}$$ method, in which fifth order polynomials are used to constrain the values and first and second order spatial derivatives, are highly refined compared to those by the CIP-BS$$^{1}$$ method, in which third order polynomials are used to constrain the values and first order spatial derivatives. The fact that this method can unambiguously solve PDEs with an one-to-one correspondence to analytical requirements is also shown for PDEs including singular functions like the Dirac delta function with Dirichet or Neumann boundary conditions. This method is straightforwardly applicable to PDEs describing complex physical and engineering problems.

Journal Articles

Solutions of hyperbolic equations with the CIP-BS method

Utsumi, Takayuki*; Yabe, Takashi*; Aoki, Takayuki*; Koga, J. K.; Yamagiwa, Mitsuru

JSME International Journal, Series B, 47(4), p.768 - 776, 2004/11

no abstracts in English

Journal Articles

Numerical simulation of melting and evaporation of a cold foil target irradiated by a pre-pulse

Utsumi, Takayuki*; Matsukado, Koji*; Daido, Hiroyuki; Esirkepov, T. Z.; Bulanov, S. V.*

Applied Physics A, 79(4-6), p.1185 - 1187, 2004/09

 Times Cited Count:10 Percentile:40.18(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Characterization of preformed plasmas with an interferometer for ultra-short high-intensity laser-plasma interactions

Sagisaka, Akito; Daido, Hiroyuki; Ogura, Koichi; Orimo, Satoshi; Hayashi, Yukio; Nishiuchi, Mamiko; Mori, Michiaki; Matsukado, Koji*; Fukumi, Atsushi*; Li, Z.*; et al.

Applied Physics B, 78(7-8), p.919 - 922, 2004/05

 Times Cited Count:25 Percentile:70.3(Optics)

no abstracts in English

Journal Articles

High-precision measurement of the wavelength of a nickel-like silver X-ray laser

Hasegawa, Noboru; Kawachi, Tetsuya; Utsumi, Takayuki*; Sasaki, Akira; Tanaka, Momoko; Kado, Masataka; Sukegawa, Kota*; Lu, P.; Kishimoto, Maki; Tai, R.; et al.

Japanese Journal of Applied Physics, Part 1, 43(5A), p.2519 - 2522, 2004/05

 Times Cited Count:12 Percentile:45.12(Physics, Applied)

We conducted high-precision measurements of the wavelength of the nickel-like silver X-ray laser in order to compare it with a theoretical wavelength. The reasons for using this laser are as follows: First, this laser line is in the wavelength region of Mo/Si multi-layer mirrors; therefore, this laser line is important for applications. Second, the strongamplification of this laser line has been obtained in our previous work, and the higher order line in the spectra obtained by our spectrometer can be used. Third, since silver is arelatively low-z material (z = 47), this wavelength is a ideal benchmark of atomic structural codes such as the Multiconfiguration Dirac-Fock (MCDF) code. The wavelength of the nickel-like silver X-ray laser was determined to be 13.887 nm. The comparison with MCDF codes shows that the present experimental result can work as a good benchmark of the accuracy of the codes.

Journal Articles

A Note on the basis set approach in the constrained interpolation profile method

Utsumi, Takayuki*; Yabe, Takashi*; Koga, J. K.; Aoki, Takayuki*; Sekine, Masatoshi*; Ogata, Yoichi*; Matsunaga, Eiichi*

Journal of Computational Physics, 196(1), p.1 - 7, 2004/05

 Times Cited Count:3 Percentile:20.59(Computer Science, Interdisciplinary Applications)

no abstracts in English

Journal Articles

Many-electron dynamics of a Xe atom in strong and superstrong laser fields

Yamakawa, Koichi; Akahane, Yutaka; Fukuda, Yuji; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Utsumi, Takayuki*

Physical Review Letters, 92(12), p.123001_1 - 123001_4, 2004/03

 Times Cited Count:66 Percentile:87.98(Physics, Multidisciplinary)

We report on detailed investigations of ionization dynamics of a Xe atom exposed to intense 800-nm pulses of 20-fs duration in the extensive intensity range from 10$$^{13}$$ to 10$$^{18}$$ W/cm$$^{2}$$. Ion yields of Xe$$^{+}$$ to Xe$$^{20+}$$ were observed as a function of laser intensity and compared with the results from a single active electron based Ammosov-Delone-Krainov model. Unexpected ionization probabilities for lower charge states and also no interplay between the inner- and outer-shells by screening are inferred. Suppression of nonsequential ionization towards higher intensity and few optical cycle regimes is also proved.

Journal Articles

Accurate basis set by the CIP method for the solutions of the schr$"o$dinger equation

Utsumi, Takayuki*; Yabe, Takashi*; Koga, J. K.; Aoki, Takayuki*; Sekine, Masatoshi*

Computer Physics Communications, 157(2), p.121 - 138, 2004/02

 Times Cited Count:13 Percentile:51.51(Computer Science, Interdisciplinary Applications)

no abstracts in English

JAEA Reports

Ionization dynamics of a xenon atom in super-strong laser fields

Yamakawa, Koichi; Akahane, Yutaka; Fukuda, Yuji; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Utsumi, Takayuki*

JAERI-Research 2003-030, 14 Pages, 2003/12

JAERI-Research-2003-030.pdf:0.75MB

We report on detailed investigations of ionization dynamics of a xenon atom exposed to intense 800-nm pulses of 20-fs duration in the extensiveintensity range from 10$$^{13}$$ to 10$$^{18}$$W/cm$$^{2}$$.Ion yields of Xe$$^{+}$$ to Xe$$^{20+}$$ were observed as a function of laser intensity and compared with the results from a single active electron(SAE) based Ammosov-Delone-Krainov(ADK) model.Unexpected ionization probabilities for lower charge states and also no interplay between the inner-and outer-shells by screening are inferred.Suppression of nonsequential ionization towards higher intensity and few optical cycle regimesis also proved.

Journal Articles

Energetic protons from a few-micron metallic foil evaporated by an intense laser pulse

Matsukado, Koji*; Esirkepov, T. Z.; Kinoshita, Kenichi*; Daido, Hiroyuki; Utsumi, Takayuki*; Li, Z.*; Fukumi, Atsushi*; Hayashi, Yukio; Orimo, Satoshi; Nishiuchi, Mamiko; et al.

Physical Review Letters, 91(21), p.215001_1 - 215001_4, 2003/11

 Times Cited Count:136 Percentile:95.28(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Improvement of accuracy and stability in numerically solving hyperbolic equations by IDO (Interpolated Differential Operator) scheme with Runge-Kutta time integration

Yoshida, Hiroshi*; Aoki, Takayuki*; Utsumi, Takayuki*

Denshi Joho Tsushin Gakkai Rombunshi, A, 86(3), p.223 - 231, 2003/03

no abstracts in English

Journal Articles

Parallel implementation of the solver for the one-dimensional Vlasov-Poisson equation based on the DA-CIP method

Utsumi, Takayuki*; Koga, J. K.; Kunugi, Tomoaki*

Parallel Computational Fluid Dynamics; New Frontiers and Multi-Disciplinary Applications, p.539 - 546, 2003/00

no abstracts in English

Journal Articles

Accurate numerical method for the solutions of the Schr$"o$dinger equation and the radial integrals based on the CIP method

Utsumi, Takayuki*; Koga, J. K.

Computer Physics Communications, 148(3), p.267 - 280, 2002/11

 Times Cited Count:6 Percentile:31.99(Computer Science, Interdisciplinary Applications)

no abstracts in English

Journal Articles

New numerical method for the solutions of the MCDF equations based on the CIP method

Utsumi, Takayuki*; Koga, J. K.

Computer Physics Communications, 148(3), p.281 - 290, 2002/11

 Times Cited Count:1 Percentile:7.15(Computer Science, Interdisciplinary Applications)

no abstracts in English

Journal Articles

The Gain distribution of the transient collisional excited X-ray lasers

Sasaki, Akira; Utsumi, Takayuki*; Moribayashi, Kengo; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Kawachi, Tetsuya; Daido, Hiroyuki

Journal of Quantitative Spectroscopy & Radiative Transfer, 71(2-6), p.665 - 674, 2001/10

 Times Cited Count:9 Percentile:46.33(Optics)

no abstracts in English

Journal Articles

Analyses of the short pulse laser pumped transient collisional excited X-ray lasers

Sasaki, Akira; Utsumi, Takayuki*; Moribayashi, Kengo; Zhidkov, A. G.; Kado, Masataka; Tanaka, Momoko; Hasegawa, Noboru; Kawachi, Tetsuya

Journal de Physique, IV, 11(Pr2), p.Pr2_75 - Pr2_78, 2001/07

no abstracts in English

Journal Articles

Prepulse effects on the interaction of intense femtosecond laser pulses with high-Z solids

Zhidkov, A. G.; Sasaki, Akira; Utsumi, Takayuki*; Fukumoto, Ichiro; Tajima, Toshiki; Saito, Fumikazu*; Hironaka, Yoichiro*; Nakamura, Kazutaka*; Kondo, Kenichi*; Yoshida, Masataka*

Physical Review E, 62(5), p.7232 - 7240, 2000/11

 Times Cited Count:51 Percentile:86(Physics, Fluids & Plasmas)

no abstracts in English

49 (Records 1-20 displayed on this page)