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Imazono, Takashi; Koike, Masato; Kawachi, Tetsuya; Hasegawa, Noboru; Koeda, Masaru*; Nagano, Tetsuya*; Sasai, Hiroyuki*; Oue, Yuki*; Yonezawa, Zeno*; Kuramoto, Satoshi*; et al.
no journal, ,
A soft X-ray flat-field spectrograph in combination with electron microscopes is one of the powerful tools for not only the structural and elemental analyses, but also the valence band analysis of materials. It is expected to be able to detect soft X-ray emissions of 50-4000 eV emitted from various materials, but difficult to cover the whole energy range using a single diffraction grating by restriction of optical imaging property and surface material. To overcome this problem, a flat-field spectrograph compatible with four varied-line-spacing gratings optimized for the respective energy range of 50-200 eV, 155-350 eV, 300-2200 eV, and 2000-4000 eV has been designed. It results in that the spectrograph can be easily selected without complicated optical alignment by just changing the desired grating of the four. In addition, a multilayer mirror to enhance uniformly a reflectivity in 2-4 keV at a constant angle of incidence was invented and applied to a wideband multilayer grating.
Koike, Masato; Imazono, Takashi; Koeda, Masaru*; Nagano, Tetsuya*; Sasai, Hiroyuki*; Oue, Yuki*; Yonezawa, Zeno*; Kuramoto, Satoshi*; Terauchi, Masami*; Takahashi, Hideyuki*; et al.
no journal, ,
When the grazing incidence angle is 3.0
, the total reflection condition is satisfied but the reflectivity is 74% due to the large extinction coefficient of 8.4
10
. Carbon has a large critical angle of carbon of and small extinction coefficient of 7.610
. We take these advantages to the coating of diffraction gratings. We assume the base laminar-type grating as follows: nickel layer of 30 nm thickness; groove density of 1200/ mm; duty ratio of 0.3; groove depth of 16 nm. Also it is assumed that the additions of conventional amorphous carbon having a density of 2.2 g/cm
and diamond-like carbon(ta-C) having 3.1 g/cm. Optimized thickness of a-C and ta-C is 12 and 24 nm, respectively. The increase of 33% 183.3 eV (a-C) and 80% (ta-C) is obtained compared with the base grating, respectively, resulting in high sensitivity measurement of ultra-trace boron K emission.
Sato, Tatsuhiko; Niita, Koji*; Matsuda, Norihiro; Hashimoto, Shintaro; Iwamoto, Yosuke; Furuta, Takuya; Iwase, Hiroshi*; Noda, Shusaku; Ogawa, Tatsuhiko; Nakashima, Hiroshi; et al.
no journal, ,
General features of the Particle and Heavy Ion Transport Code System, PHITS, will be described at the meeting.
Tsubouchi, Masaaki; Ochi, Yoshihiro; Tanaka, Momoko; Yoshida, Fumiko; Nagashima, Keisuke
no journal, ,
We are developing intense THz light source to realize control of molecular axis orientation in space. From the theoretical studies by Hebling and co-workers, it has been known that the desirable excitation NIR pulse for the THz light generation process in the Mg-sLiNbO
crystal should have the pulse width of 400 fs - 1 ps, and the tilted pulse front by 63 degree. To generate such NIR light, the Yb:YAG based amplifier system is one of the good candidates. By using this system, we are trying to generate the intense THz light with the high repetition rate (1 kHz).
B
O
6 scintillatorKoshimizu, Masanori*; Fujimoto, Yutaka*; Yanagida, Takayuki*; Iwamatsu, Kazuhiro; Kimura, Atsushi; Kurashima, Satoshi; Taguchi, Mitsumasa; Asai, Keisuke*
no journal, ,
no abstracts in English
Nagaya, Yasunobu
no journal, ,
no abstracts in English
Oba, Hironori; Saeki, Morihisa; Wakaida, Ikuo
no journal, ,
no abstracts in English
Ogawa, Shuichi*; Yamada, Takatoshi*; Ishizuka, Shinji*; Yoshigoe, Akitaka; Hasegawa, Masataka*; Teraoka, Yuden; Takakuwa, Yuji*
no journal, ,
no abstracts in English
Saruya, Ryota*; Kato, Hijiri*; Kubota, Atsushi*; Miura, Kenta*; Kada, Wataru*; Sato, Takahiro; Koka, Masashi; Ishii, Yasuyuki; Kamiya, Tomihiro; Nishikawa, Hiroyuki*; et al.
no journal, ,
no abstracts in English
Kambayashi, Yuya*; Kada, Wataru*; Saruya, Ryota*; Kubota, Atsushi*; Sato, Takahiro; Koka, Masashi; Ishii, Yasuyuki; Kamiya, Tomihiro; Miura, Kenta*; Hanaizumi, Osamu*
no journal, ,
no abstracts in English
Otomo, Manabu; Yamauchi, Yasushi*; Entani, Shiro; Matsumoto, Yoshihiro; Naramoto, Hiroshi*; Sakai, Seiji
no journal, ,
Hexagonal boron nitride (h-BN) is a promising barrier material for graphene spintronics. In this study, the electronic structure of the hydrogenated h-BN was studied by means of spin-polarized metastable de-excitation spectroscopy (SPMDS). The spin polarization of the hydrogenated h-BN was selectively detected due to extreme surface sensitivity of the method. The atomic displacement of boron and nitrogen was also confirmed by X-ray standing wave technique.
Tanaka, Ryohei*; Hideshima, Iori*; Minoura, Yuya*; Yoshigoe, Akitaka; Teraoka, Yuden; Hosoi, Takuji*; Shimura, Takayoshi*; Watanabe, Heiji*
no journal, ,
no abstracts in English
Entani, Shiro; Honda, Mitsunori; Matsumoto, Yoshihiro; Otomo, Manabu; Naramoto, Hiroshi*; Sakai, Seiji
no journal, ,
no abstracts in English
Tang, J.*; Nishimoto, Kiwamu*; Ogawa, Shuichi*; Yoshigoe, Akitaka; Ishizuka, Shinji*; Watanabe, Daiki*; Teraoka, Yuden; Takakuwa, Yuji*
no journal, ,
Kanasaki, Masato; Jinno, Satoshi; Sakaki, Hironao; Nishiuchi, Mamiko; Faenov, A. Ya.*; Pikuz, T.; Kondo, Kiminori; Oda, Keiji*; Yamauchi, Tomoya*; Matsui, Ryutaro*; et al.
no journal, ,
In laser-driven ion acceleration using cluster-gas targets, generated ions can be assigned to two components. One is a low energy component produced by Coulomb explosions of clusters. The other is a high energy component produced by a magnetic vortex acceleration mechanism. In the past studies, high energy ions were mainly measured by stacked CR-39 detectors to obtain the energy spectrum. In the present study, to reveal the acceleration mechanism, a spatial distribution of MeV ions was measured by CR-39 detectors which were encircled equidistant from the laser focus spot. The etch pit distribution on the CR-39 suggests that the acceleration mechanism cannot be explained only by Coulomb explosion mechanism, but by other complicated mechanisms.
Yamamoto, Takashi*; Muller, C.*; McGuinness, L.*; Teraji, Tokuyuki*; Naydenov, B.*; Onoda, Shinobu; Oshima, Takeshi; Koizumi, Satoshi*; Wrachtrup, J.*; Jelezko, F.*; et al.
no journal, ,
no abstracts in English
Sagisaka, Akito; Nishiuchi, Mamiko; Pirozhkov, A. S.; Ogura, Koichi; Sakaki, Hironao; Maeda, Shota; Pikuz, T.; Faenov, A. Y.*; Fukuda, Yuji; Kanasaki, Masato; et al.
no journal, ,
High-intensity laser and thin-foil interactions produce high-energy particles, hard X-ray, high-order harmonics, and terahertz radiation. A proton beam driven by a high-intensity laser has received attention as a compact ion source for medical and other applications. We have performed several high intensity laser-matter interaction experiments using a thin-foil target irradiated by Ti:sapphire laser (J-KAREN) at JAEA. The pulse duration was typically 
40 fs (FWHM). The high-order harmonics (2nd4th) were observed with the spectrometer in the reflected direction. The maximum proton energy of 40 MeV energy were observed at the peak laser intensity of 110
W/cm
.
Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Pikuz, T.; Faenov, A. Ya.*; Ogura, Koichi; Hayashi, Yukio; Kotaki, Hideyuki; Ragozin, E. N.*; Neely, D.*; et al.
no journal, ,
Sasaki, Akira; Sunahara, Atsushi*; Nishihara, Katsunobu*
no journal, ,
no abstracts in English