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Journal Articles

Quadrupole effects in tetragonal crystals PrCu$$_2$$Si$$_2$$ and DyCu$$_2$$Si$$_2$$

Mitsumoto, Keisuke*; Goto, Saori*; Nemoto, Yuichi*; Akatsu, Mitsuhiro*; Goto, Terutaka*; Dung, N. D.*; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Sugiyama, Kiyohiro*; et al.

Journal of Physics; Condensed Matter, 25(29), p.296002_1 - 296002_8, 2013/07

 Times Cited Count:2 Percentile:10.36(Physics, Condensed Matter)

Journal Articles

Efficient production of a collimated MeV proton beam from a Polyimide target driven by an intense femtosecond laser pulse

Nishiuchi, Mamiko; Daido, Hiroyuki; Yogo, Akifumi; Orimo, Satoshi; Ogura, Koichi; Ma, J.-L.; Sagisaka, Akito; Mori, Michiaki; Pirozhkov, A. S.; Kiriyama, Hiromitsu; et al.

Physics of Plasmas, 15(5), p.053104_1 - 053104_10, 2008/05

 Times Cited Count:44 Percentile:83.88(Physics, Fluids & Plasmas)

High-flux energetic protons whose maximum energies are up to 4 MeV are generated by an intense femtosecond Titanium Sapphire laser pulse interacting with a 7.5, 12.5, and 25$$mu$$m thick Polyimide tape targets. The laser pulse energy is 1.7 J, duration is 34 fs, and intensity is 3$$times$$10$$^{19}$$Wcm$$^{-2}$$. The amplified spontaneous emission (ASE) has the intensity contrast ratio of 4$$times$$10$$^{-8}$$. The conversion efficiency from laser energy into proton kinetic energies of $$sim$$3% is achieved, which is comparable or even higher than those achieved in the previous works with nanometer-thick targets and the ultrahigh contrast laser pulses ($$sim$$10$$^{-10}$$).

Journal Articles

The Irradiation facilities for the radiation tolerance testing of semiconductor devices for space use in Japan

Saido, Masahiro; Fukuda, Mitsuhiro; Arakawa, Kazuo; Tajima, Satoshi; Sunaga, Hiromi; Yotsumoto, Keiichi; Kamiya, Tomihiro; Tanaka, Ryuichi; Hirao, Toshio; Nashiyama, Isamu; et al.

Proceedings of 1999 IEEE Nuclear and Space Radiation Effects Conference, p.117 - 122, 1999/00

no abstracts in English

Journal Articles

Measurement of collected charge induced by heavy ion microbeam in SOI devices

Hirao, Toshio; *; *; Nashiyama, Isamu; Matsuda, Sumio*; Nemoto, N.*; Onishi, K.*

SDM97-194, p.57 - 63, 1998/02

no abstracts in English

Journal Articles

SEU testing using cocktail ion beams

Nemoto, N.*; Shindo, Hiroyuki*; *; Kuboyama, Satoshi*; Oshima, Takeshi; Ito, Hisayoshi; Nashiyama, Isamu; Matsuda, Sumio*

Proceedings of 3rd International Workshop on Radiation Effects on Semiconductor Devices for Space Application, p.154 - 159, 1998/00

no abstracts in English

Journal Articles

Thermal annealing of interface traps and trapped charges induced by irradiation in oxides of 3C-SiC metal-oxide-semiconductor structures

Yoshikawa, Masahito; Nemoto, N.*; Ito, Hisayoshi; Okumura, Hajime*; *; Yoshida, Sadafumi*; Nashiyama, Isamu

Mater. Sci. Eng., B, 47(3), p.218 - 223, 1997/00

 Times Cited Count:1 Percentile:11.83(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Efficient production of MeV proton beam from a Polyimide target driven by an intense femto-second laser

Nishiuchi, Mamiko; Daido, Hiroyuki; Yogo, Akifumi; Orimo, Satoshi; Ogura, Koichi; Ma, J.-L.; Sagisaka, Akito; Mori, Michiaki; Pirozhkov, A. S.; Kiriyama, Hiromitsu; et al.

no journal, , 

The efficient proton beam whose maximum energy of up to 4 MeV was produced by the 50TW short pulse intensity Ti:Sap laser irradiated on the polyimide target [(C$$_{16}$$H$$_{6}$$O$$_{4}$$N$$_{2}$$)n] with the thicknesses of 7.5$$mu$$m, 12.5$$mu$$m, 25$$mu$$m, which is transparent to the 800 nm laser. The laser parameters are energy of 1.7J, pulse width of 35fs and the intensity of 3$$times$$10$$^{19}$$ Wcm$$^{-2}$$. The contrast of the ASE component is 4$$times$$10$$^{-8}$$. The conversion efficiency from laser energy into the proton kinetic energy is up to $$sim$$3%. This conversion efficiency is comparable or even higher than the results obtained with the same level laser ($$sim$$ J energy) interacts with the nano-meter level ultra thin target. In this paper we discuss on the comparison between our results and other experimental results obtained in other facilities.

Oral presentation

Applications of the high intensity short-pulse laser driven $$sim$$ MeV proton beam

Nishiuchi, Mamiko; Daito, Izuru; Ikegami, Masahiro; Mori, Michiaki; Orimo, Satoshi; Ogura, Koichi; Sagisaka, Akito; Yogo, Akifumi; Pirozhkov, A. S.; Ma, J.*; et al.

no journal, , 

A laser-driven proton beam with a maximum energy of a few MeV is stably obtained using an ultra-short and high-intensity Titanium Sapphire laser. As compared with the proton beam from the conventional accelerator, this proton beam exhibits peculiar characteristics, such as, more than 10$$^{13}$$ protons per bunch are produced within a short pulse duration of $$sim$$ps at a source, resulting in a very high peak current. It also exhibits a very low transverse emittance. The proton beam has a divergence angle of $$sim$$10 degrees and energy spread of $$sim$$100%. It accompanies electrons and X-rays, which is produced simultaneously. Making the best use of these peculiar characteristics, many possible applications of the laser-driven proton are proposed. In order to make practical laser-driven proton beam for the applications, we carry out series of experiments. We have successfully obtained simultaneous imaging of the target with proton and X-ray or proton and electron beams. In the course of practical use of the proton beam for specific applications, characteristics above should be optimized based on the variations of the applications. For example, in order to apply the laser-driven proton beam for the proton irradiation system, such as used in the medical or the industrial applications, we should obtain focused or parallel proton beam. One of our plans to alter the orbits of the laser-driven protons from the planer tape target is using permanent quadrupole magnets.

Oral presentation

Generation of high-energy protons and THz radiation with the thin-foil target

Sagisaka, Akito; Pirozhkov, A. S.; Daido, Hiroyuki; Ogura, Koichi; Orimo, Satoshi; Yogo, Akifumi; Daito, Izuru; Nishiuchi, Mamiko; Mori, Michiaki; Nashima, Shigeki*; et al.

no journal, , 

no abstracts in English

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