Efficient production of a collimated MeV proton beam from a Polyimide target driven by an intense femtosecond laser pulse

Nishiuchi, Mamiko; Daido, Hiroyuki; Yogo, Akifumi; Orimo, Satoshi; Ogura, Koichi; Ma, J.-L.; Sagisaka, Akito; Mori, Michiaki; Pirozhkov, A. S.; Kiriyama, Hiromitsu; et al.

Physics of Plasmas, 15(5), p.053104_1 - 053104_10, 2008/05

https://doi.org/10.1063/1.2928161

High-flux energetic protons whose maximum energies are up to 4 MeV are generated by an intense femtosecond Titanium Sapphire laser pulse interacting with a 7.5, 12.5, and 25m thick Polyimide tape targets. The laser pulse energy is 1.7 J, duration is 34 fs, and intensity is 310Wcm. The amplified spontaneous emission (ASE) has the intensity contrast ratio of 410. The conversion efficiency from laser energy into proton kinetic energies of 3% is achieved, which is comparable or even higher than those achieved in the previous works with nanometer-thick targets and the ultrahigh contrast laser pulses (10).

The Evaluation of the uncertainty of the solute transport with the inversion analysis of in-situ tracer tests

Hata, Akihito*; Ijiri, Yuji*; Oishi, Masaya*; Sugihara, Yutaka*

JNC TJ8440 2003-001, 99 Pages, 2003/01

JNC-TJ8440-2003-001.pdf:2.49MB

None

Study on evaluation of uncertainty due to geological environment

Ijiri, Yuji*; Hattori, Hiromichi*; Suzuki, Shunichi*; Oishi, Masaya*; Kubota, Shigeru*; Adachi, Tetsuya*; Yamamoto, Takuya*

JNC TJ8400 2001-010, 143 Pages, 2001/03

JNC-TJ8400-2001-010.pdf:17.19MB

The evaluation of uncertainty of geological environment is a key issue in assessing a performance of a deep geological disposal system for high-level nuclear waste. The geological environment uncertainty is arose from data obtained from surveys and model used for a performance assessment.The objectives of this study is to develop a rational planning methodology of site characterization using the Horonobe site as a model case, and to establish a modeling methodology using the Tono site as a model case. At the Horonobe site, first, a conceptual model is constructed based on the information at every stage of site characterization procedure. A sensitivity analysis is performed using various conceptual models and data. If conceptual models uncertainty have a great impact on the result of performance assessment analysis, surveys that detect the most appropriate conceptual model are conducted in the next stage of site characterization. If data uncertainty have a great impact on the result of performance assessment analysis, surveys that decrease the data uncertainty are conducted. Thus, a rational site characterization methodology in which the most sensitive items are preferentially detected in the next stage of site characterization is developed. This concept of a rational site characterization methodology is described in this report. In addition, preliminary conceptual model is developed based on geological information around Horonobe site, and data uncertainty for the sensitivity analysis which will be conducted in next year is investigated. At the Tono site, literature on model uncertainty is surveyed, and data obtained at the Tono site is reviewed from modeling point of view.

None

Ijiri, Yuji*; Suzuki, Shunichi*; Oishi, Masaya*; Sugihara, Yutaka*; Shimo, Michito*; *; *

JNC TJ7400 2001-007, 612 Pages, 2001/03

JNC-TJ7400-2001-007.pdf:118.17MB

no abstracts in English

Activation cross section measurements at neutron energy from 13.3 to 14.9MeV using the FNS facility

Konno, Chikara; Ikeda, Yujiro; *; Kawade, Kiyoshi*; Yamamoto, Hiroshi*; Maekawa, Hiroshi

JAERI 1329, 105 Pages, 1993/10

JAERI-1329.pdf:3.54MB

no abstracts in English

Neutronics experiment and analysis on a tungsten slab assembly bombarded with D-T neutrons

Ikeda, Yujiro; *; Konno, Chikara; Nakamura, Tomoo

Fusion Engineering and Design, 18, p.309 - 315, 1991/00

https://doi.org/10.1016/0920-3796(91)90144-F

no abstracts in English

Fusion neutron shielding benchmark problems

*; Sasamoto, Nobuo; Mori, Seiji*; *; Kawai, Masayoshi*; *; Sakurai, Kiyoshi; Shin, Kazuo*; Sekimoto, Hiroshi*; Oyama, Yukio; et al.

JAERI-M 87-203, 230 Pages, 1987/12

JAERI-M-87-203.pdf:4.46MB

no abstracts in English

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 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 410Wcm. 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.