JOPSS - Search Results

Search Results: Records 1-20 displayed on this page of 40

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Journal Articles

Stabilization of a high-order harmonic generation seeded extreme ultraviolet free electron laser by time-synchronization control with electro-optic sampling

Tomizawa, Hiromitsu*; Sato, Takahiro*; Ogawa, Kanade*; Togawa, Kazuaki*; Tanaka, Takatsugu*; Hara, Toru*; Yabashi, Makina*; Tanaka, Hitoshi*; Ishikawa, Tetsuya*; Togashi, Tadashi*; et al.

High Power Laser Science and Engineering, 3, p.e14_1 - e14_10, 2015/04

https://doi.org/10.1017/hpl.2015.9

Times Cited Count：6 Percentile：34.26(Optics)

no abstracts in English

Journal Articles

Spin state of Co $^{3+}$ in LaCo $_{1-x}$ Rh $_{x}$ O $_{3}$ investigated by structural phenomena

Asai, Shinichiro*; Okazaki, Ryuji*; Terasaki, Ichiro*; Yasui, Yukio*; Kobayashi, Wataru*; Nakao, Akiko*; Kobayashi, Kensuke*; Kumai, Reiji*; Nakao, Hironori*; Murakami, Yoichi*; et al.

Journal of the Physical Society of Japan, 82(11), p.114606_1 - 114606_6, 2013/11

https://doi.org/10.7566/JPSJ.82.114606

Times Cited Count：6 Percentile：43.38(Physics, Multidisciplinary)

Neutron and synchrotron X-ray diffraction for LaCo $_{1-x}$ Rh $_{x}$ O $_{3}$ have been carried out in order to investigate the structural properties related with the spin state of Co $^{3+}$ ions. We have found that the values of the Co(Rh)-O bond lengths in the Co(Rh)O $_{6}$ octahedron of LaCo $_{0.8}$ Rh $_{0.2}$ O $_{3}$ are nearly identical at 10 K. The lattice volume for the Rh $^{3+}$ substituted samples decreases with the thermal expansion coefficient similar to that of LaCoO $_{3}$ from room temperature, and ceases to decrease around 70 K. These experimental results favor a mixed state consisting of the high-spin state and low-spin state Co $^{3+}$ ions, and suggest that the high-spin state Co $^{3+}$ ions are thermally excited in addition to those pinned by the substituted Rh $^{3+}$ ions.

Journal Articles

Full-coherent free electron laser seeded by 13th- and 15th-order harmonics of near-infrared femtosecond laser pulses

Sato, Takahiro*; Iwasaki, Atsushi*; Owada, Shigeki*; Yamanouchi, Kaoru*; Takahashi, Eiji*; Midorikawa, Katsumi*; Aoyama, Makoto; Yamakawa, Koichi; Togashi, Tadashi*; Fukami, Kenji*; et al.

Journal of Physics B; Atomic, Molecular and Optical Physics, 46(16), p.164006_1 - 164006_6, 2013/08

https://doi.org/10.1088/0953-4075/46/16/164006

Times Cited Count：3 Percentile：18.98(Optics)

By introducing 13th- (61.7 nm) and 15th-order harmonics (53.4 nm) of femtosecond laser pulses at 800 nm into an undulator of SCSS (SPring-8 Compact SASE Source) test accelerator at RIKEN, these harmonic pulses were amplified by a factor of more than 10 $^{2}$ with a high contrast ratio through the interaction between accelerated electron bunches and the harmonic pulses. From numerical simulations of the amplification processes of high-order harmonic pulses in the undulator, optimum conditions of the electron bunch duration interacting with the high-order harmonic pulses were investigated for generating full-coherent and intense pulses in the extreme ultraviolet wavelength region.

Journal Articles

Full-coherent HHG-seeded EUV-FEL locked by EOS timing feedback

Ogawa, Kanade*; Sato, Takahiro*; Matsubara, Shinichi*; Okayasu, Yuichi*; Togashi, Tadashi*; Watanabe, Takahiro*; Takahashi, Eiji*; Midorikawa, Katsumi*; Aoyama, Makoto; Yamakawa, Koichi; et al.

Proceedings of 10th Conference on Lasers and Electro-Optics Pacific Rim and 18th OptoElectronics and Communications Conference and Photonics in Switching 2013 (CLEO-PR & OECC/PS 2013) (USB Flash Drive), 2 Pages, 2013/06

https://doi.org/10.1109/CLEOPR.2013.6600178

no abstracts in English

Journal Articles

High intense full-coherent radiation of free electron laser seeded by high-order harmonics in extreme-ultraviolet region

Togashi, Tadashi*; Takahashi, Eiji*; Midorikawa, Katsumi*; Aoyama, Makoto; Yamakawa, Koichi; Sato, Takahiro*; Iwasaki, Atsushi*; Owada, Shigeki*; Yamanouchi, Kaoru*; Hara, Toru*; et al.

Proceedings of Ultrafast Optics IX (CD-ROM), 2 Pages, 2013/03

We have demonstrated free-electron laser radiation seeded by high-order harmonics in the extreme-ultraviolet region. Strong enhancement of the radiation intensity by a factor of 104 was observed with timing control of an electro-optical sampling technique.

Journal Articles

Extreme ultraviolet free electron laser seeded by high-order harmonic

Togashi, Tadashi*; Takahashi, Eiji*; Midorikawa, Katsumi*; Aoyama, Makoto; Yamakawa, Koichi; Sato, Takahiro*; Iwasaki, Atsushi*; Owada, Shigeki*; Yamanouchi, Kaoru*; Hara, Toru*; et al.

Proceedings of 11th International School and Symposium on Synchrotron Radiation in Natural Science (ISSRNS 2012), p.1 - 21, 2012/05

The 13th harmonic of a Ti:sapphire laser has been significantly amplified with the SCSS test accelerator. The temporal and spatial overlap of the electron beam and the high harmonic radiation were precisely tuned for achieving the seeded free electron laser operation. With numerical simulation the present HH-seeded FEL scheme could readily be applied to the wavelength region down to 10 nm.

Journal Articles

Two-dimensional charge fluctuation in -Na $_{0.33}$ V $_{2}$ O $_{5}$

Owada, Kenji; Yamauchi, Toru*; Fujii, Yasuhiko*; Ueda, Yutaka*

Physical Review B, 85(13), p.134102_1 - 134102_4, 2012/04

https://doi.org/10.1103/PhysRevB.85.134102

Times Cited Count：9 Percentile：38.24(Materials Science, Multidisciplinary)

We have investigated the critical phenomena of the metal-to-insulator (MI) transition of -Na $_{0.33}$ V $_{2}$ O $_{5}$ . The critical exponent of 0.226(3) and anisotropic diffuse scattering suggest that the MI transition of -Na $_{0.33}$ V $_{2}$ O $_{5}$ is two-dimensional in nature and that the dimension of the order parameter is not Ising. The non-Ising-like order parameter indicates that the MI transition is not a simple order-disorder type such as that of '-NaV $_{2}$ O $_{5}$ but charge-density-wave-like, where the valence at each V site is continuous and the arrangement is modulated. This closely corresponds to the situation predicted by neutron diffraction measurements and NMR measurements.

Journal Articles

Extreme ultraviolet free electron laser seeded by high-order harmonic

Togashi, Tadashi*; Takahashi, Eiji*; Midorikawa, Katsumi*; Aoyama, Makoto; Yamakawa, Koichi; Sato, Takahiro*; Iwasaki, Atsushi*; Okino, Tomoya*; Yamanouchi, Kaoru*; Hara, Toru*; et al.

Proceedings of 2011 Conference on Lasers and Electro-Optics (CLEO 2011) (CD-ROM), p.1527 - 1528, 2011/05

http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5950741

We succeeded in generating the seeded free electron laser (FEL) with wavelengths of 61 nm at the SCSS test accelerator. The 13th (61 nm) harmonics generated by focusing the high peak power Ti:Sapphire laser to the Xe gas cell was directed to the undulator. This is first realization of the seeded FEL in extreme ultraviolet region.

Journal Articles

Seeding of extreme ultraviolet free electron laser with high-order harmonic

Takahashi, Eiji*; Togashi, Tadashi*; Midorikawa, Katsumi*; Aoyama, Makoto; Yamakawa, Koichi; Sato, Takahiro*; Iwasaki, Atsushi*; Owada, Shigeki*; Yamanouchi, Kaoru*; Hara, Toru*; et al.

Proceedings of European Conference on Lasers and Electro-Optics and the 12th European Quantum Electronics Conference (CLEO/Europe-EQEC 2011) (CD-ROM), 1 Pages, 2011/05

http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5943030

Journal Articles

EUV-FEL seeded by high-order harmonic

Takahashi, Eiji*; Togashi, Tadashi*; Aoyama, Makoto; Yamakawa, Koichi; Sato, Takahiro*; Iwasaki, Atsushi*; Owada, Shigeki*; Yamanouchi, Kaoru*; Hara, Toru*; Matsubara, Shinichi*; et al.

Proceedings of International Quantum Electronics Conference and the Pacific Rim Conference on Lasers and Electro-Optics (IQEC/CLEO Pacific Rim 2011) (CD-ROM), p.199 - 200, 2011/05

http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6193595

Journal Articles

Extreme ultraviolet free electron laser seeded with high-order harmonic of Ti:sapphore laser

Togashi, Tadashi*; Takahashi, Eiji*; Midorikawa, Katsumi*; Aoyama, Makoto; Yamakawa, Koichi; Sato, Takahiro*; Iwasaki, Atsushi*; Owada, Shigeki*; Okino, Tomoya*; Yamanouchi, Kaoru*; et al.

Optics Express (Internet), 19(1), p.317 - 324, 2011/01

https://doi.org/10.1364/OE.19.000317

Times Cited Count：96 Percentile：96.43(Optics)

The 13th harmonic of a Ti:sapphire (Ti:S) laser in the plateau region was injected as a seeding source to a 250-MeV free-electron-laser (FEL) amplifier. When the amplification conditions were fulfilled, strong enhancement of the radiation intensity by a factor of 650 was observed. The random and uncontrollable spikes, which appeared in the spectra of the Self-Amplified Spontaneous Emission (SASE) based FEL radiation without the seeding source, were found to be suppressed drastically to form to a narrow-band, single peak profile at 61.2 nm. The properties of the seeded FEL radiation were well reproduced by numerical simulations. We discuss the future precept of the seeded FEL scheme to the shorter wavelength region.

Journal Articles

Steep gradient and pedestal of electron profiles in H-mode JFT-2M plasma

Yamauchi, Toshihiko; Hoshino, Katsumichi; Uesugi, Yoshihiko; ; Kawashima, Hisato; Kasai, Satoshi; Kawakami, Tomohide; Maeda, Hikosuke; Matoba, Toru; Matsuda, Toshiaki; et al.

Japanese Journal of Applied Physics, 27(5), p.L924 - L926, 1988/05

https://doi.org/10.1143/JJAP.27.L924

Times Cited Count：1 Percentile：9.67(Physics, Applied)

no abstracts in English

JAEA Reports

Multi-mode optical fibers for simultaneous 13-position measurements Thomson scattering apparatus in the JFT-2M tokamak

Yamauchi, Toshihiko; *; Nakazawa, Ichiro*; Matoba, Toru

JAERI-M 87-196, 19 Pages, 1987/11

JAERI-M-87-196.pdf:0.67MB

no abstracts in English

JAEA Reports

Magnetic fluctuations in L-mode and H-mode on the JFT-2M tokamak

Mori, Masahiro; Miura, Yukitoshi; Suzuki, Norio; Uesugi, Yoshihiko; Tamai, Hiroshi; Ogawa, Toshihide; Ogawa, Hiroaki; Otsuka, Hideo; Odajima, Kazuo; Kasai, Satoshi; et al.

JAERI-M 87-117, 13 Pages, 1987/08

JAERI-M-87-117.pdf:0.56MB

no abstracts in English

JAEA Reports

Observation of H-mode by electron cyclotron heating of JFT-2M tokamak preheated by a neutral beam

Hoshino, Katsumichi; Yamamoto, Takumi; Suzuki, Norio; Kawashima, Hisato; Kasai, Satoshi; Kawakami, Tomohide; Maeda, Hikosuke; Matoba, Toru; Matsuda, Toshiaki; Matsumoto, Hiroshi; et al.

JAERI-M 87-096, 10 Pages, 1987/07

JAERI-M-87-096.pdf:0.39MB

no abstracts in English

Journal Articles

Measurement of peripheral electron temperature by electron cyclotron emission during the H-mode transition in JFT-2M tokamak

; ; ; ; ; ; ; ; ; ; et al.

Journal of the Physical Society of Japan, 56(5), p.1750 - 1764, 1987/05

https://doi.org/10.1143/JPSJ.56.1750

Times Cited Count：24 Percentile：78.32(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Behaviour of the peripheral electron temperature at the H-transition observed on the JFF-2M tokamaku

Hoshino, Katsumichi; Odajima, Kazuo; Yamamoto, Takumi; Suzuki, Norio; Kawashima, Hisato; Yamauchi, Toshihiko; Uesugi, Yoshihiko; Kasai, Satoshi; Kawakami, Tomohide; Maeda, Hikosuke; et al.

Physics Letters A, 124(4-5), p.299 - 302, 1987/00

https://doi.org/10.1016/0375-9601(87)90642-6

Times Cited Count：7 Percentile：54.6(Physics, Multidisciplinary)

no abstracts in English

JAEA Reports