Refine your search:     
Report No.
 - 
Search Results: Records 1-12 displayed on this page of 12
  • 1

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 ...

Save select records

Journal Articles

Modeling of ultra-cold and crystalline ion beams

Okamoto, Hiromi*; Sugimoto, Hiroshi*; Yuri, Yosuke; Ikegami, Masahiro*; Wei, J.*

Proceedings of 10th International Computational Accelerator Physics Conference (ICAP 2009) (Internet), p.151 - 156, 2009/08

Journal Articles

Application of laser-accelerated protons to the demonstration of DNA double-strand breaks in human cancer cells

Yogo, Akifumi; Sato, Katsutoshi; Nishikino, Masaharu; Mori, Michiaki; Teshima, Teruki*; Numasaki, Hodaka*; Murakami, Masao*; Demizu, Yusuke*; Akagi, Takashi*; Nagayama, Shinichi*; et al.

Applied Physics Letters, 94(18), p.181502_1 - 181502_3, 2009/05

 Times Cited Count:95 Percentile:94.5(Physics, Applied)

Journal Articles

Focusing and spectral enhancement of a repetition-rated, laser-driven, divergent multi-MeV proton beam using permanent quadrupole magnets

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

Applied Physics Letters, 94(6), p.061107_1 - 061107_3, 2009/02

 Times Cited Count:54 Percentile:87.76(Physics, Applied)

A pair of conventional permanent magnet quadrupoles is used to focus a 2.4 MeV laser-driven proton beam at a 1 Hz repetition rate. The magnetic field strengths are 55 T/m and 60 T/m for the first and second quadrupoles respectively. The proton beam is focused to a spot size (full width at half maximum) of 2.7$$times$$8 mm$$^{2}$$ at a distance of 650 mm from the source. This result is in good agreement with a Monte Carlo particle trajectory simulation.

Journal Articles

Beam cooling experiment at ion storage ring, S-LSR

Shirai, Toshiyuki*; Tanabe, Mikio*; Soda, Hikaru*; Ikegami, Masahiro*; Fujimoto, Shinji*; Tongu, Hiromu*; Noda, Akira*; Noda, Koji*; Shibuya, Shinji*; Fujimoto, Tetsuya*; et al.

Proceedings of 9th Symposium on Accelerator and Related Technology for Application, p.19 - 22, 2007/06

Journal Articles

Crystalline beams in dispersion-free storage rings

Ikegami, Masahiro*; Okamoto, Hiromi*; Yuri, Yosuke

Physical Review Special Topics; Accelerators and Beams, 9(12), p.124201_1 - 124201_11, 2006/12

 Times Cited Count:5 Percentile:40.58(Physics, Nuclear)

Generating a multidimensional crystalline beam in a storage ring has been known to be difficult without a special cooling force, i.e., tapered cooling, because of the momentum dispersion induced by bending magnets. It is, however, possible to eliminate the dispersion all around the ring by adding an electric dipole field in each magnetic bending region. A storage ring with such unique deflectors should enable us to reach multidimensional crystalline states with an ordinary "untapered" cooling force. In order to verify this expectation, molecular dynamics simulations are performed to study beam crystallization in several dispersion-free storage rings including the S-LSR at Kyoto University. The present results show that various crystalline states can be established without relying on the tapered force.

Journal Articles

Energetic protons from a few-micron metallic foil evaporated by an intense laser pulse

Matsukado, Koji*; Esirkepov, T. Z.; Kinoshita, Kenichi*; Daido, Hiroyuki; Utsumi, Takayuki*; Li, Z.*; Fukumi, Atsushi*; Hayashi, Yukio; Orimo, Satoshi; Nishiuchi, Mamiko; et al.

Physical Review Letters, 91(21), p.215001_1 - 215001_4, 2003/11

 Times Cited Count:134 Percentile:95.57(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Present status of R&D for the superconducting proton linac at JAERI

Mizumoto, Motoharu; Kusano, Joichi; Hasegawa, Kazuo; Ouchi, Nobuo; Oguri, Hidetomo; Ichihara, Masahiro; Tomisawa, Tetsuo; Ito, Takashi; Chishiro, Etsuji*; Ikegami, Masanori*; et al.

KEK Proceedings 99-25, p.3 - 5, 2000/02

no abstracts in English

Journal Articles

Experimental and analytical study on thermal displacement characteristics of cooling system applied to floating support unit

Hanawa, Satoshi; Ishihara, Masahiro; Tachibana, Yukio; Koikegami, Hajime*

Proceedings of 8th International Conference on Nuclear Engineering (ICONE-8) (CD-ROM), p.9 - 0, 2000/00

no abstracts in English

Oral presentation

Cooling simulation of heavy ion beams

Ikegami, Masahiro*; Okamoto, Hiromi*; Yuri, Yosuke; Soda, Hikaru*; Tanabe, Mikio*; Noda, Akira*

no journal, , 

no abstracts in English

Oral presentation

Improvement of the JAEA J-KAREN laser and its applications to high field science, 4; Phase rotation technique of the intense and short pulse laser driven proton beam by synchronous RF field

Nishiuchi, Mamiko; Daido, Hiroyuki; Yogo, Akifumi; Mori, Michiaki; Kiriyama, Hiromitsu; Kanazawa, Shuhei; Sagisaka, Akito; Ogura, Koichi; Orimo, Satoshi; Kondo, Shuji; et al.

no journal, , 

By applying the RF filed to the high intensity short pulse laser-driven $$sim$$MeV proton beam, we have demonstrated the generation of the quasi-monoenegetic proton spectra and modification of the spatial distribution of proton beams. We used J-KAREN laser system at the JAEA. We focused it to Polyimide target. The intensity was 4$$times$$10$$^{18}$$Wcm$$^{-2}$$. We produced repetetively the proton beams with the maximum energy of 2.2 MeV. We guided this proton beam to the cabvity of the RF field. We observed significant energy peaks in the proton energy spectra. The resultant energy concentration was 11 % (FWHM) out of 100 %. At the same time, we could change the divergence of the beam with the RF field. According to the Monte-Carlo simulation, the spatially converging proton beam has energy spectra with the energy spread of 100 %, on the contrary the spatially diverging beam has mono-energetic energy spectra. This method is very useful because it can apply to repetitivelly produced proton beams to control the energy as well as spatial distributions.

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

Proton acceleration and laser-plasma interaction diagnostics with J-KAREN laser

Pirozhkov, A. S.; Mori, Michiaki; Yogo, Akifumi; Kiriyama, Hiromitsu; Ogura, Koichi; Sagisaka, Akito; Ma, J.*; Orimo, Satoshi; Nishiuchi, Mamiko; Sugiyama, Hironori*; et al.

no journal, , 

12 (Records 1-12 displayed on this page)
  • 1