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Numata, Naoto*; Asakawa, Tomoyuki*; Sakai, Hiroshi*; Umemori, Kensei*; Furuya, Takaaki*; Shinoe, Kenji*; Enami, Kazuhiro*; Egi, Masato*; Sakanaka, Shogo*; Michizono, Shinichiro*; et al.
Proceedings of 12th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.566 - 570, 2015/09
no abstracts in English
Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.
Kotaki, Hideyuki; Daito, Izuru; Kando, Masaki; Hayashi, Yukio; Kawase, Keigo; Kameshima, Takashi*; Fukuda, Yuji; Homma, Takayuki; Ma, J.*; Chen, L. M.*; et al.
Physical Review Letters, 103(19), p.194803_1 - 194803_4, 2009/11
Times Cited Count：58 Percentile：88.26(Physics, Multidisciplinary)Kotaki, Hideyuki; Kando, Masaki; Daito, Izuru; Homma, Takayuki; Kameshima, Takashi; Kawase, Keigo; Chen, L.-M.*; Fukuda, Yuji; Kiriyama, Hiromitsu; Kondo, Shuji; et al.
AIP Conference Proceedings 1153, p.176 - 181, 2009/07
Kiriyama, Hiromitsu; Mori, Michiaki; Nakai, Yoshiki; Shimomura, Takuya*; Tanoue, Manabu*; Akutsu, Atsushi; Okada, Hajime; Motomura, Tomohiro*; Kondo, Shuji; Kanazawa, Shuhei; et al.
JAEA-Conf 2008-007, p.13 - 16, 2008/08
One of the main bottlenecks for the applications of ultrashort and ultrahigh-peak power lasers in high-field physics is a temporal contrast of the pulses. In ultrahigh-peak power lasers, a nanosecond background of the amplified spontaneous emission (ASE) is generated at the same time as the femtosecond pulse. This background is mostly generated in the preamplifier (regenerative, multipass amplifier). Even though the contrast level is usually in the range from 10
to 10
, this level is not sufficiently low at relativistic intensities greater than 10
W/cm
to avoid unwanted pre-plasmas generation. We demonstrated a high-contrast, high-peak power laser with optical parametric chirped-pulse amplification (OPCPA). With the use of OPCPA, contrast is enhanced to better than 7
10
in a few picoseconds before the main pulse, which corresponds to an improvement of three to four orders in magnitude compared with conventional systems.
Fukuda, Yuji; Akahane, Yutaka; Aoyama, Makoto; Hayashi, Yukio; Homma, Takayuki; Inoue, Norihiro*; Kando, Masaki; Kanazawa, Shuhei; Kiriyama, Hiromitsu; Kondo, Shuji; et al.
Physics Letters A, 363(2-3), p.130 - 135, 2007/02
Collimated relativistic electrons up to 58 MeV with an electron charge of 2.1 nC were generated by the interaction of intense laser pulses with the Ar cluster target at the laser intensity of 3.510
W/cm. The resulting spectrum does not fit a Maxwellian distribution, but is well described by a two-temperature Maxwellian, which indicates two mechanisms of the electron acceleration. Two dimensional particle-in-cell simulations demonstrate an important role of clusters. The higher energy electrons are injected when they are expelled from the clusters by the laser pulse field. They then gain their energy during the direct acceleration by the laser pulse, whose phase velocity in the underdense plasma is larger than speed of light in vacuum. The lower energy electrons, which are injected during the plasma wave breaking, are accelerated by the wakefield.
Hayashi, Yukio; Fukumi, Atsushi*; Matsukado, Koji*; Mori, Michiaki; Kotaki, Hideyuki; Kando, Masaki; Chen, L.-M.; Daito, Izuru; Kondo, Shuji; Kanazawa, Shuhei; et al.
Radiation Protection Dosimetry, 121(2), p.99 - 107, 2006/12
Times Cited Count：16 Percentile：70.56(Environmental Sciences)The authors obtain a new equation to estimate the forward component of a photon dose which is generated through the interaction between a target and a short pulse high power laser. As the equation is quite simple, it is useful for calculating the photon dose. The equation shows that the photon dose is proportional to the electron temperature for the range of its temperature 
3 MeV, and proportional to square of the electron temperature for the range of its temperature 
3 MeV. The dose estimated with this method is roughly consistent with the result of Monte Carlo simulation. On someassumptions and corrections, it can reproduce experimental results obtained and the dose result calculated at other laboratories.
Yamazaki, Atsushi; Kotaki, Hideyuki; Daito, Izuru; Kando, Masaki; Bulanov, S. V.; Esirkepov, T. Z.; Kondo, Shuji; Kanazawa, Shuhei; Homma, Takayuki*; Nakajima, Kazuhisa; et al.
Physics of Plasmas, 12(9), p.093101_1 - 093101_5, 2005/09
Times Cited Count：70 Percentile：88.77(Physics, Fluids & Plasmas)no abstracts in English
Soyama, Hitoshi*; Futakawa, Masatoshi; Homma, Kana*
Journal of Nuclear Materials, 343(1-3), p.116 - 122, 2005/08
Times Cited Count：10 Percentile：56.74(Materials Science, Multidisciplinary)In order to estimate life time of the mercury target vessel of spallation neutron source which will be subjected to cavitation impacts, prediction methods of pitting damage induced by the cavitation impact were proposed. It is very important to estimate incubation time, in which plastic deformation occurs without mass loss, because the thickness of vessel is very thin. In the present paper, two estimation methods were proposed. One of them is estimatiion from erosion test of severely damaged specimen by plotting the mass loss as a function of exposure time to cavitation on the logarithmic scales. Another method is the observation method of plastic deformation pits on damaged surface at very early period in incubation stage.
Kando, Masaki; Masuda, Shinichi; Zhidkov, A.*; Yamazaki, Atsushi; Kotaki, Hideyuki; Kondo, Shuji; Homma, Takayuki*; Kanazawa, Shuhei; Nakajima, Kazuhisa; Hayashi, Yukio; et al.
Physical Review E, 71(1), p.015403_1 - 015403_4, 2005/01
Times Cited Count：33 Percentile：77.37(Physics, Fluids & Plasmas)no abstracts in English
Kotaki, Hideyuki; Masuda, Shinichi; Kando, Masaki; Kondo, Shuji; Kanazawa, Shuhei; Homma, Takayuki; Nakajima, Kazuhisa
Quantum Aspects of Beam Physics 2003, p.119 - 124, 2004/10
Times Cited Count：0 Percentile：0.4(Astronomy & Astrophysics)no abstracts in English
Kando, Masaki; Kotaki, Hideyuki; Kondo, Shuji; Kanazawa, Shuhei; Masuda, Shinichi; Homma, Takayuki; Nakajima, Kazuhisa
Proceedings of 28th Linear Accelerator Meeting in Japan, p.135 - 137, 2003/08
no abstracts in English
Kando, Masaki; Kotaki, Hideyuki; Kondo, Shuji; Kanazawa, Shuhei; Masuda, Shinichi; Homma, Takayuki; Nakajima, Kazuhisa
Proceedings of 27th Linear Accelerator Meeting in Japan, p.148 - 150, 2002/08
no abstracts in English
Kotaki, Hideyuki; Masuda, Shinichi*; Kando, Masaki; Kondo, Shuji; Kanazawa, Shuhei; Homma, Takayuki; Nakajima, Kazuhisa
no journal, ,
no abstracts in English
Kotaki, Hideyuki; Masuda, Shinichi*; Kando, Masaki; Koga, J. K.; Kondo, Shuji; Kanazawa, Shuhei; Homma, Takayuki; Nakajima, Kazuhisa
no journal, ,
no abstracts in English
Fukuda, Yuji; Akahane, Yutaka; Hayashi, Yukio; Homma, Takayuki; Inoue, Norihiro*; Kando, Masaki; Kanazawa, Shuhei; Kiriyama, Hiromitsu; Kondo, Shuji; Kotaki, Hideyuki; et al.
no journal, ,
no abstracts in English
Fukuda, Yuji; Akahane, Yutaka; Aoyama, Makoto; Hayashi, Yukio; Homma, Takayuki; Kando, Masaki; Kanazawa, Shuhei; Kiriyama, Hiromitsu; Kondo, Shuji; Kotaki, Hideyuki; et al.
no journal, ,
no abstracts in English
Kotaki, Hideyuki; Masuda, Shinichi*; Kando, Masaki; Daito, Izuru; Hayashi, Yukio; Koga, J. K.; Kondo, Shuji; Kanazawa, Shuhei; Homma, Takayuki; Nakajima, Kazuhisa; et al.
no journal, ,
no abstracts in English
Kotaki, Hideyuki; Daito, Izuru; Kando, Masaki; Fukuda, Yuji; Hayashi, Yukio; Chen, L.-M.; Homma, Takayuki; Bolton, P.*; Ma, J.-L.; Mori, Michiaki; et al.
no journal, ,
no abstracts in English
Kotaki, Hideyuki; Kando, Masaki; Daito, Izuru; Homma, Takayuki; Kameshima, Takashi; Kawase, Keigo; Chen, L.-M.; Fukuda, Yuji; Kiriyama, Hiromitsu; Kondo, Shuji; et al.
no journal, ,
no abstracts in English
