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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

 Times Cited Count:6 Percentile:34.58(Optics)

no abstracts in English

Journal Articles

Compact XFEL and AMO sciences; SACLA and SCSS

Yabashi, Makina*; Tanaka, Hitoshi*; Tanaka, Takashi*; Tomizawa, Hiromitsu*; Togashi, Tadashi*; Nagasono, Mitsuru*; Ishikawa, Tetsuya*; Harries, J.; Hikosaka, Yasumasa*; Hishikawa, Akiyoshi*; et al.

Journal of Physics B; Atomic, Molecular and Optical Physics, 46(16), p.164001_1 - 164001_19, 2013/08

 Times Cited Count:71 Percentile:95.24(Optics)

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

 Times Cited Count:3 Percentile:19.12(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

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

Performance upgrade in the JAEA actinide science beamline BL23SU at SPring-8 with a new twin-helical undulator

Saito, Yuji; Fukuda, Yoshihiro; Takeda, Yukiharu; Yamagami, Hiroshi; Takahashi, Sunao*; Asano, Yoshihiro*; Hara, Toru*; Shirasawa, Katsutoshi*; Takeuchi, Masao*; Tanaka, Takashi*; et al.

Journal of Synchrotron Radiation, 19(3), p.388 - 393, 2012/05

 Times Cited Count:95 Percentile:97.05(Instruments & Instrumentation)

The soft X-ray beamline BL23SU at SPring-8 has undergone an upgrade with a twin-helical undulator of in-vacuum type to enhance the experimental capabilities of the end stations. The new light source with a fast helicity-switching operation allows not only the data throughput but also the sensitivity in X-ray magnetic circular dichroism (XMCD) to be improved. The operational performance and potential are described by presenting XMCD results of paramagnetic $$beta$$-US$$_{2}$$ measured with a 10 T superconducting magnet.

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

Demagnetization of undulator magnets irradiated high energy electrons

Bizen, Teruhiko*; Tanaka, Takashi*; Asano, Yoshihiro; Kim, D. E.*; Bak, J. S.*; Lee, H. S.*; Kitamura, Hideo*

Nuclear Instruments and Methods in Physics Research A, 467-468(Part1), p.185 - 189, 2001/07

 Times Cited Count:40 Percentile:92.11(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Single-, double- and triple-electron capture cross sections for multicharged slow carbon ions in H$$_{2}$$,CH$$_{4}$$,C$$_{2}$$H$$_{6}$$,C$$_{3}$$H$$_{8}$$ and CO$$_{2}$$ molecules

Ito, Akio*; Imanishi, Nobutsugu*; *; Hamamoto, Nariaki*; *; Tanaka, Takashi*; *; Saito, Manabu*; Haruyama, Yoichi*; Shirai, Toshizo

Journal of the Physical Society of Japan, 64(9), p.3255 - 3264, 1995/09

 Times Cited Count:20 Percentile:70.75(Physics, Multidisciplinary)

no abstracts in English

JAEA Reports

Charge-changing collision cross sections of low-energy carbon ions with carbon containing molecules

Hamamoto, Nariaki*; Tanaka, Takashi*; Ito, Akio*; Imanishi, Nobutsugu*; Saito, Manabu*; Haruyama, Yoichi*; Shirai, Toshizo

JAERI-M 93-202, 45 Pages, 1993/10

JAERI-M-93-202.pdf:1.09MB

no abstracts in English

Oral presentation

Temporal overlapping for an HH seeded EUV-FEL operation by using EO-based timing-drift controlling system

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

no journal, , 

no abstracts in English

Oral presentation

Stable operation of HHG-seeded EUV-FEL at the SCSS test accelerator

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

no journal, , 

no abstracts in English

11 (Records 1-11 displayed on this page)
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