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1. Laser-Shock Compression and Hugoniot Measurements of Liquid Hydrogen to 55 GPa

Author

Sano, T., Ozaki, N., Sakaiya, T., Shigemori, K., Ikoma, M., Kimura, T., Miyanishi, K., Endo, T., Shiroshita, A., Takahashi, H., Jitsui, T., Hori, Y., Hironaka, Y., Iwamoto, A., Kadono, T., Nakai, M., Okuchi, T., Otani, K., Shimizu, K., Kondo, T., Kodama, R., and Mima, K.

Subjects
Condensed Matter - Materials Science, Astrophysics - Earth and Planetary Astrophysics
Abstract

The principal Hugoniot for liquid hydrogen was obtained up to 55 GPa under laser-driven shock loading. Pressure and density of compressed hydrogen were determined by impedance-matching to a quartz standard. The shock temperature was independently measured from the brightness of the shock front. Hugoniot data of hydrogen provide a good benchmark to modern theories of condensed matter. The initial number density of liquid hydrogen is lower than that for liquid deuterium, and this results in shock compressed hydrogen having a higher compression and higher temperature than deuterium at the same shock pressure., Comment: 8 pages, 7 figures, 2 tables, accepted for publication in Physical Review B

Published
2011
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3. Rayleigh Taylor and Laser Imprinting Diagnostics

Author

Azechi, H., Nakai, M., Shigemori, K., Izumi, N., Shiraga, H., Nishikino, M., Sakaiya, T., Fujioka, S., Tamari, Y., Miyanaga, N., Nishimura, H., Stott, Peter E., editor, Wootton, Alan, editor, Gorini, Giuseppe, editor, Sindoni, Elio, editor, and Batani, Dimitri, editor

Published
2002
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5. Flyer acceleration experiments using high-power laser

Author

Kadono T., Sakaiya T., Hironaka Y., Nagatomo H., Sano T., Watari T., Otani K., Fujiwara T., Mochiyama T., Fujioka S., Shigemori K., Yabuta H., Kondo T., Arakawa M., Nakamura A.M., Kurosawa K., Sugita S., Ohno S., and Matsui T.

Subjects
Physics, QC1-999
Abstract

Flyer acceleration technique using high-power lasers has several advantages such as the achieved velocities higher than 10 km/s and non-contamination to the products generated by impacts. In this study, we show that a high-power laser can achieve flyer velocities higher than 10 km/s up to 60 km/s using spherical projectiles with a diameter of 0.1 − 0.3mm. We discuss the projectile condition during the flight based on the results of numerical simulations.

Published
2013
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9. Impact ignition as a track to laser fusion

Author

Murakami, M., primary, Nagatomo, H., additional, Johzaki, T., additional, Sakaiya, T., additional, Velikovich, A., additional, Karasik, M., additional, Gus'kov, S., additional, and Zmitrenko, N., additional

Published
2014
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10. Acceleration to High Velocities and Heating by Impact Using Nike KrF Laser

Author

NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV, Karasik, Max, Weaver, J. L., Aglitskiy, Y., Watari, T., Arikawa, Y., Sakaiya, T., Oh, J., Velikovich, A. L., Zalesak, S. T., Bates, J. W., Obenschain, S. P., Schmitt, A. J., Murakami, M., Azechi, H., NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV, Karasik, Max, Weaver, J. L., Aglitskiy, Y., Watari, T., Arikawa, Y., Sakaiya, T., Oh, J., Velikovich, A. L., Zalesak, S. T., Bates, J. W., Obenschain, S. P., Schmitt, A. J., Murakami, M., and Azechi, H.

Abstract

Here we discuss experiments that explore the acceleration of near solid density planar targets to extremely high speeds using a krypton fluoride laser. These velocities exceed those needed for even the highest velocity designs contemplated for inertial fusion implosions. Collisions of the high velocity targets provide a means to obtain pressures above 1 Gbar, a regime of interest to high energy density physics. The temperatures and pressures are high enough at 1000 km/s to produce thermonuclear neutrons when employing targets containing deuterium. The velocities reported here are to our knowledge the highest achieved by laser acceleration of material, and approach those thought to be needed for impact ignition., Published in Physics of Plasmas, v17 p056317, 2010. Prepared in cooperation with SAIC, McLean, VA; Osaka University, Osaka, Japan; and RSI, Lanham, MD. The original document contains color images.

Published
2010

12. SILICATE DUST SIZE DISTRIBUTION FROM HYPERVELOCITY COLLISIONS: IMPLICATIONS FOR DUST PRODUCTION IN DEBRIS DISKS

Author

Takasawa, S., primary, Nakamura, A. M., additional, Kadono, T., additional, Arakawa, M., additional, Dohi, K., additional, Ohno, S., additional, Seto, Y., additional, Maeda, M., additional, Shigemori, K., additional, Hironaka, Y., additional, Sakaiya, T., additional, Fujioka, S., additional, Sano, T., additional, Otani, K., additional, Watari, T., additional, Sangen, K., additional, Setoh, M., additional, Machii, N., additional, and Takeuchi, T., additional

Published
2011
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13. Laser-shock compression and Hugoniot measurements of liquid hydrogen to 55 GPa

Author

Sano, T., primary, Ozaki, N., additional, Sakaiya, T., additional, Shigemori, K., additional, Ikoma, M., additional, Kimura, T., additional, Miyanishi, K., additional, Endo, T., additional, Shiroshita, A., additional, Takahashi, H., additional, Jitsui, T., additional, Hori, Y., additional, Hironaka, Y., additional, Iwamoto, A., additional, Kadono, T., additional, Nakai, M., additional, Okuchi, T., additional, Otani, K., additional, Shimizu, K., additional, Kondo, T., additional, Kodama, R., additional, and Mima, K., additional

Published
2011
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15. Hugoniot and temperature measurements of liquid hydrogen by laser-shock compression

Author

Sano, T, primary, Ozaki, N, additional, Sakaiya, T, additional, Shigemori, K, additional, Ikoma, M, additional, Kimura, T, additional, Miyanishi, K, additional, Endo, T, additional, Shiroshita, A, additional, Takahashi, H, additional, Jitsui, T, additional, Hori, Y, additional, Hironaka, Y, additional, Iwamoto, A, additional, Kadono, T, additional, Nakai, M, additional, Okuchi, T, additional, Otani, K, additional, Shimizu, K, additional, Kondo, T, additional, Kodama, R, additional, and Mima, K, additional

Published
2010
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16. Acceleration to high velocities and heating by impact using Nike KrF laser

Author

Karasik, Max, primary, Weaver, J. L., additional, Aglitskiy, Y., additional, Watari, T., additional, Arikawa, Y., additional, Sakaiya, T., additional, Oh, J., additional, Velikovich, A. L., additional, Zalesak, S. T., additional, Bates, J. W., additional, Obenschain, S. P., additional, Schmitt, A. J., additional, Murakami, M., additional, and Azechi, H., additional

Published
2010
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17. Impact experiments with a new technique for acceleration of projectiles to velocities higher than Earth's escape velocity of 11.2 km/s

Author

Kadono, T., primary, Sakaiya, T., additional, Hironaka, Y., additional, Otani, K., additional, Sano, T., additional, Fujiwara, T., additional, Mochiyama, T., additional, Kurosawa, K., additional, Sugita, S., additional, Sekine, Y., additional, Nishikanbara, W., additional, Matsui, T., additional, Ohno, S., additional, Shiroshita, A., additional, Miyanishi, K., additional, Ozaki, N., additional, Kodama, R., additional, Nakamura, A. M., additional, Arakawa, M., additional, Fujioka, S., additional, and Shigemori, K., additional

Published
2010
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18. Measurement of preheating due to radiation and nonlocal electron heat transport in laser-irradiated targets

Author

Otani, K., primary, Shigemori, K., additional, Kadono, T., additional, Hironaka, Y., additional, Nakai, M., additional, Shiraga, H., additional, Azechi, H., additional, Mima, K., additional, Ozaki, N., additional, Kimura, T., additional, Miyanishi, K., additional, Kodama, R., additional, Sakaiya, T., additional, and Sunahara, A., additional

Published
2010
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20. Experimental Evidence of Impact Ignition: 100-Fold Increase of Neutron Yield by Impactor Collision

Author

Azechi, H., primary, Sakaiya, T., additional, Watari, T., additional, Karasik, M., additional, Saito, H., additional, Ohtani, K., additional, Takeda, K., additional, Hosoda, H., additional, Shiraga, H., additional, Nakai, M., additional, Shigemori, K., additional, Fujioka, S., additional, Murakami, M., additional, Nagatomo, H., additional, Johzaki, T., additional, Gardner, J., additional, Colombant, D. G., additional, Bates, J. W., additional, Velikovich, A. L., additional, Aglitskiy, Y., additional, Weaver, J., additional, Obenschain, S., additional, Eliezer, S., additional, Kodama, R., additional, Norimatsu, T., additional, Fujita, H., additional, Mima, K., additional, and Kan, H., additional

Published
2009
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21. Shock Hugoniot and temperature data for polystyrene obtained with quartz standard

Author

Ozaki, N., primary, Sano, T., additional, Ikoma, M., additional, Shigemori, K., additional, Kimura, T., additional, Miyanishi, K., additional, Vinci, T., additional, Ree, F. H., additional, Azechi, H., additional, Endo, T., additional, Hironaka, Y., additional, Hori, Y., additional, Iwamoto, A., additional, Kadono, T., additional, Nagatomo, H., additional, Nakai, M., additional, Norimatsu, T., additional, Okuchi, T., additional, Otani, K., additional, Sakaiya, T., additional, Shimizu, K., additional, Shiroshita, A., additional, Sunahara, A., additional, Takahashi, H., additional, and Kodama, R., additional

Published
2009
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22. IMPACT EXPERIMENTS WITH PROJECTILES AT VELOCITIES HIGHER THAN 10 KM∕S

Author

Kadono, T., primary, Sakaiya, T., additional, Hironaka, Y., additional, Otani, K., additional, Sano, T., additional, Fujiwara, T., additional, Mochiyama, T., additional, Kurosawa, K., additional, Sugita, S., additional, Sekine, Y., additional, Matsui, T., additional, Ohno, S., additional, Shiroshita, A., additional, Miyanishi, K., additional, Ozaki, N., additional, Kodama, R., additional, Nakamura, A. M., additional, Arakawa, M., additional, Fujioka, S., additional, Shigemori, K., additional, Elert, Mark, additional, Furnish, Michael D., additional, Anderson, William W., additional, Proud, William G., additional, and Butler, William T., additional

Published
2009
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23. WIDE ANGLE X-RAY DIFFRACTION FOR SHOCKED PERICLASE

Author

Hironaka, Y., primary, Shigemori, K., additional, Kadono, T., additional, Fujioka, S., additional, Tanabe, M., additional, Shiroshita, A., additional, Ozaki, N., additional, Miyanishi, K., additional, Kondo, T., additional, Otani, K., additional, Sakaiya, T., additional, Shimizu, K., additional, Elert, Mark, additional, Furnish, Michael D., additional, Anderson, William W., additional, Proud, William G., additional, and Butler, William T., additional

Published
2009
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24. Experimental investigation to demonstrate Impact Fast Ignition scheme

Author

Watari T, Azechi H, Nakai M, Hironaka Y, Sakaiya T, Nakamura H, Shiraga H, Shigemori K, Hosoda H, Arikawa Y, Homma H, Norimatsu T, Murakami M, Jhozaki T, Tms group, God group, Karasik M, Gardner J, Bates J, Colombant D, Weber J, Aglitsky Y, and Obenschain S

Subjects
History, Yield (engineering), Materials science, business.industry, Nuclear engineering, Fusion power, Laser, Kinetic energy, Computer Science Applications, Education, law.invention, Ignition system, Deuterium, Physics::Plasma Physics, law, Physics::Chemical Physics, Atomic physics, business, Beam (structure), Thermal energy
Abstract

We have proposed a new ignition scheme of Fast Ignition, called "Impact Fast Ignition (IFI)", in which a compressed fuel is ignited by impact collision of a fragment of separately imploded fuel. We performed integrated experiments on impact ignition, in which a portion of a deuterated polystyrene (CD) shell was accelerated to about 600 km/s and was collided with precompressed CD fuel. The shell was imploded using 9 beams and the impactor was accelerated using 3 beams of the GEKKO XII laser system. The laser energy was 350 J per beam. The kinetic energy of the impactor was efficiently converted into thermal energy generating a temperature of about 1.8 keV., Observed maximum neutron yield was 2×106. This yield was 80 times as large as that without impactor. We will present the experimental details and results, demonstrating the high potential of impact ignition for fusion energy production.

Published
2010

26. Rayleigh–Taylor instability growth on low-density foam targets

Author

Watari, T., primary, Nakai, M., additional, Azechi, H., additional, Sakaiya, T., additional, Shiraga, H., additional, Shigemori, K., additional, Fujioka, S., additional, Otani, K., additional, Nagai, K., additional, Sunahara, A., additional, Nagatomo, H., additional, and Mima, K., additional

Published
2008
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30. Fabrication and characterization of planar cryogenic targets for GEKKO-XII

Author

Huang, T X, primary, Nakai, M, additional, Shigemori, K, additional, Shiraga, H, additional, Sakaiya, T, additional, Watari, T, additional, Ohtani, K, additional, Shiota, T, additional, Takeda, K, additional, Maegawa, O, additional, Azechi, H, additional, Nagata, M, additional, Norimatsu, T, additional, Nagai, K, additional, Mima, K, additional, Izawa, Y, additional, Mito, T, additional, and Iwamoto, K, additional

Published
2008
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34. Hugoniot measurement of diamond under laser shock compression up to 2TPa

Author

Nagao, H., primary, Nakamura, K. G., additional, Kondo, K., additional, Ozaki, N., additional, Takamatsu, K., additional, Ono, T., additional, Shiota, T., additional, Ichinose, D., additional, Tanaka, K. A., additional, Wakabayashi, K., additional, Okada, K., additional, Yoshida, M., additional, Nakai, M., additional, Nagai, K., additional, Shigemori, K., additional, Sakaiya, T., additional, and Otani, K., additional

Published
2006
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35. Towards realization of hyper-velocities for impact fast ignition

Author

Murakami, M, primary, Nagatomo, H, additional, Sakaiya, T, additional, Azechi, H, additional, Fujioka, S, additional, Shiraga, H, additional, Nakai, M, additional, Shigemori, K, additional, Saito, H, additional, Obenschain, S, additional, Karasik, M, additional, Gardner, J, additional, Bates, J, additional, Colombant, D, additional, Weaver, J, additional, and Aglitskiy, Y, additional

Published
2005
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36. TIME-RESOLVED SPECTROSCOPIC OBSERVATIONS OF SHOCK-INDUCED SILICATE IONIZATION.

Author

Kurosawa, K., Kadono, T., Sugita, S., Shigemori, K., Hironaka, Y., Sano, T., Sakaiya, T., Ozaki, N., Shiroshita, A., Ohno, S., Cho, Y., Hamura, T., Fujioka, S., Tachibana, S., Vinci, T., Kodama, R., and Matsui, T.

Subjects
SCIENTIFIC observation, SHOCK waves, HIGH power lasers, THICKNESS measurement, IMPACT (Mechanics), HEAT transfer
Abstract

We conducted time-resolved spectroscopic observations of shock-heated quartz and forsterite using a high-power laser. The results revealed that ionization occur easily under shock-induced warm dense conditions. We compare the obtained temperatures on the Hugoniot with a few theories. The comparison suggests that the contribution of shock-induced ionization to the isochoric specific heat during shock compression is ~1 kb/atom for quartz and forsterite. Shock-induced ionization and subsequent electron recombination leads to a larger amount of vapor and may lead to dynamical and chemical evolution of silicate vapor clouds different from our current understandings. [ABSTRACT FROM AUTHOR]

Published
2012
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37. DIRECT MEASUREMENT OF CHEMICAL COMPOSITION OF SOx IN IMPACT VAPOR USING A LASER GUN.

Author

Ohno, S., Kadono, T., Kurosawa, K., Hamura, T., Sakaiya, T., Sugita, S., Shigemori, K., Hironaka, Y., Sano, T., Watari, T., Otani, K., and Matsui, T.

Subjects
HIGH power lasers, IMPACT (Mechanics), ENERGY transfer, THICKNESS measurement, EQUATIONS of state, HYPERVELOCITY, VAPORIZATION
Abstract

The final chemical composition of vapor clouds created by the impacts higher than 10 km/s is important to investigate the evolution of the planetary surface environment and life. However, no previous experimental study has observed directly it because of experimental difficulties. In this study, we conducted hypervelocity impact experiments using a laser gun and measured the chemical compositions of the impact-generated sulfuric oxides directly. The result clearly shows that the sulfur oxides released by hypervelocity impacts are dominated by SO3, not SO2. [ABSTRACT FROM AUTHOR]

Published
2012
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38. FLYER ACCELERATION BY HIGH-POWER LASER AND IMPACT EXPERIMENTS AT VELOCITIES HIGHER THAN 10 KM/S.

Author

Kadono, T., Shigemori, K., Sakaiya, T., Hironaka, Y., Sano, T., Watari, T., Otani, K., Fujiwara, T., Mochiyama, T., Nagatomo, H., Fujioka, S., Nakamura, A. M., Arakawa, M., Sugita, S., Kurosawa, K., Ohno, S., and Matsui, T.

Subjects
ACCELERATION (Mechanics), ENERGY transfer, IMPACT (Mechanics), THICKNESS measurement, EQUATIONS of state, KINETIC energy
Abstract

Flyer acceleration technique using high-power lasers has several advantages such as the achieved velocities higher than 10 km/s and non-contamination to the products generated by impacts. In this study, we show that a high-power laser can achieve impact velocities higher than 10 km/s up to 60 km/s using sheet flyers with a diameter of ~ 0.5 mm and a thickness of ~ 30 - 50 μm and spherical projectiles with a diameter of 0.1 - 0.3 mm. We discuss the difference between sheet and spherical flyers in the energy transfer efficiency from laser energy to flyer kinetic energy. [ABSTRACT FROM AUTHOR]

Published
2012
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39. WIDE ANGLE X-RAY DIFFRACTION FOR SHOCKED PERICLASE.

Author

Hironaka, Y., Shigemori, K., Kadono, T., Fujioka, S., Tanabe, M., Shiroshita, A., Ozaki, N., Miyanishi, K., Kondo, T., Otani, K., Sakaiya, T., and Shimizu, K.

Subjects
X-ray diffraction, OPTICAL diffraction, OPTICS, LASERS, LIGHT
Abstract

We performed wide angle x-ray diffraction for Laser shocked MgO single crystal. Wide angle x-ray diffraction technique was applied to measure the transient atomic motion near the Hugoniot elastic limit to determine the three dimensional atomic motion under shock loading. The perfect atomic uni-axial motion was observed at the compression of 4.6%. This results was equivalent to the cubic-tetragonal distortion within 5 ns. [ABSTRACT FROM AUTHOR]

Published
2009
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40. Measurements of Sound Velocity of Laser-Irradiated Iron Foils Relevant to Earth Core Condition.

Author

Shigemori, K., Ichinose, D., Irifune, T., Otani, K., Shiota, T., Sakaiya, T., and Azechi, H.

Subjects
SPEED of sound, IRON, METAL foils, MECHANICAL shock, PRESSURE, LASER beams
Abstract

We have developed a novel method to measure sound velocity of laser-irradiated iron foils by side-on x-ray radiograph technique. Iron foils were irradiated with two-stepped laser pulse to reach the earth’s core condition. We obtained not only the sound velocity but also temperature, pressure, shock velocity, compressibility, and particle velocity of the laser-irradiated iron. The experimental results are in good agreements with previous experimental results and with one-dimensional simulation results. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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42. Hydrodynamic Instability Experiments on the HIPER Laser.

Author

Shigemori, K., Azechi, H., Fujioka, S., Kanai, Y., Miyanaga, N., Murakami, M., Muranaka, T., Nagatomo, H., Nakai, M., Nishikino, M., Nishihara, K., Nishimura, H., Sakaiya, T., Shiraga, H., Sunahara, A., Takabe, H., Takayama, T., Tamari, Y., and Tanaka, M.

Subjects
LASERS, HYDRODYNAMICS, MAGNETOHYDRODYNAMIC instabilities, LASER ablation
Abstract

We present recent results on the hydrodynamic instability experiments on the HIPER (High Intensity Plasma Experimental Research) laser facility at Institute of Laser Engineering, Osaka University. We measured the Rayleigh-Taylor growth rate on the HIPER laser. Also measured were all parameters that determine the RT growth rate. We focused on the measurements of the ablation density of laser-irradiated targets, which had not been experimentally measured. The experimental results were compared with calculations with one dimensional simulation coupled with and without Fokker-Planck equation for electron heat transport. [ABSTRACT FROM AUTHOR]

Published
2003

43. Neutron generation from impact fast ignition.

Author

Watari, T, Sakaiya, T, Azechi, H, Nakai, M, Shiraga, H, Shigemori, K, Hosoda, H, Saito, H, Arikawa, Y, Sakawa, Y, Fujioka, S, Hironaka, Y, Murakami, M, Karasik, M, Gardner, J, Bates, J, Colombant, D, Weber, J, Obenschain, S, and Aglitsky, Y

Published
2008
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46. IMPACT EXPERIMENTS WITH PROJECTILES AT VELOCITIES HIGHER THAN 10 KM/S.

Author

Kadono, T., Sakaiya, T., Hironaka, Y., Otani, K., Sano, T., Fujiwara, T., Mochiyama, T., Kurosawa, K., Sugita, S., Sekine, Y., Matsui, T., Ohno, S., Shiroshita, A., Miyanishi, K., Ozaki, N., Kodama, R., Nakamura, A. M., Arakawa, M., Fujioka, S., and Shigemori, K.

Subjects
*METEORITES, *IMPACT craters, *PLANETS, *PROJECTILES, *SPEED
Abstract

Impact velocity of meteorites on planetary and satellite surfaces at the final stage of planetary accretion becomes more than 10 km/s. The impacts with velocities higher than 10 km/s generate very large craters and a large amount of silicate vapor, melt, and fast ejecta, and would make great effects on the planetary surface environments. However, the details of the effects by such impacts on the environments have not been understood well yet. The reasons are probably that macroscopic (>∼0.1 mm) projectiles are not easily accelerated to more than 10 km/s in laboratories. This makes it difficult to investigate experimentally the impact phenomenon with impact velocities higher than 10 km/s. In this paper, we demonstrate that higher impact velocities than 10 km/s can be achieved using projectiles with a diameter of 0.1–0.3 mm: we accelerate glass and aluminum projectiles using a high-power laser, GEKKO XII—HIPER. The projectiles are collided into LiF targets. We observe some lines of Li gas using a time-resolved spectrometer after an estimated impact time, which indicates that the impact vaporization with higher velocities than 10 km/s occurs. [ABSTRACT FROM AUTHOR]

Published
2009
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49. Progress of impact fast ignition

Author

Murakami, M., Nagatomo, H., Sakaiya, T., Shinsuke Fujioka, Saito, H., Shiraga, H., Nakai, M., Shigemori, K., Azechi, H., Karasik, M., Gardner, J., Bates, J., Colombant, D., Weaver, J., Schmitt, A., Velikovich, A., Aglitskiy, Y., Sethian, J., and Obenshain, S.

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