2007 Fiscal Year Final Research Report Summary
Research on high energy density plasmas produced by peta watt laser
| Project/Area Number |
15GS0214
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| Research Category |
Grant-in-Aid for Creative Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Institution | Osaka University |
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Principal Investigator |
MIMA Kunioki Osaka University, Institute of Laser Engineering, Professor (30033921)
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| Co-Investigator(Kenkyū-buntansha) |
NAGATOMO Hideo Osaka University, Institute of Laser Engineering, Associate Professor (10283813)
KODAMA Ryosuke Osaka University, Graduate school of Engineering, Professor (80211902)
SAKAGAMI Hitoshi Osaka University, National Institute of Fusion Science, Department of Simulation Science, Professor (30254452)
NAKAO Yasuyuki Kyushu University, Graduate school of Engineering, Professor (00164129)
SAKABE Shuji Kyoto University, Institute for Chemical Research, Professor (50153903)
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| Project Period (FY) |
2003 – 2007
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| Keywords | Fast Ignition / Relativistic Laser Plasma / Laser Particle Acceleration / High Energy Electron / Particle Simulation / Fokker Planck Simulation / radiation hydrodynamics / OPCPA |
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| Research Abstract |
In 2003, we started this project to create a new field in the research of peta watt laser plasmas within five years. As for the experiments, since the new OPCPA front end was introduced to reduce the pre-pulse level from 10^<-4> to 10^<-8>, the improved GMII has been applied to the proton acceleration. By using a thin foil target, we achieved the acceleration of up to about 20MeV. We also irradiated solid planer targets to measure the relativistic electron spectrum of which slope temperature without pre-pulse is lower than that with pre-pulse. By this achievement, we can carry out well controlled experiments and analyze experimental data precisely with theory and simulation.
In the theory and simulation research, we combined a radiation hydrodynamic simulation with the hydro code PINOCO, a collective PIC simulation, and a Fokker Planck simulation to simulate the fast plasma heating for laser fusion and neutron source researches. As the target design for the fast ignition experiments wit
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h of FI3, we simulated the imploded plasma heating processes for the cone target experiment. In particular, the double cone target was introduced to improve the relativistic electron confinement in the cone and guiding them to he tip of the cone. The PIC simulation indicated that the strong magnetic fields in the vacuum gap are generated which confine relativistic electrons for a long time. As the results, the coupling efficiency is enhanced by 1.5 time. We also investigated the pre-plasma effects on the high energy electron transport. It is found that when the scale length of the pre-plasma exceeds a few μm, the electron slope temperature is too hig for the efficient plasma heating. In order to overcome this difficulty, we investigated the plasma production processes by the pre-pulse. According to the simulations, prepulse intensity is required to be lower than 10^<11>W/cm^2.
In conclusion, after 5 year project, the integrated simulation code was developed and validated. The simulation research contributed to the experiment design and analysis. In the experiment, the GMII short pulse ultra intense laser was improved and applied to the proton and electron beam acceleration experiments. The self-generated magnetic field s and the relativistic electron guiding have been clarified. Less
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Research Products
(55 results)
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[Journal Article] Simulation and design study of cryogenic cone shell target for fast ignition FIREX project2007
Author(s)
Nagatomo, H., Johzaki, T., Nakamura, T., Sakagami, H., Sunahara, A., Mima, K.
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Journal Title
Physics of Plasmas 14
Pages: 056303
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Polarization of Heα Radiation due to Anisotropy of Fast-Electron Transport in Ultraintense-Laser-Produced Plasmas2007
Author(s)
Kawamura, T., Kai, T., Koike, F., Nakazaki, S., Inubushi, Y., Nishimura H.
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Journal Title
PHYSICAL REVIEW LETTERS 99
Pages: 115003
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] On the behavior of ultraintense laser produced hot electrons in self-excited fields2007
Author(s)
Yabuuchi, T, Adumi, K, Habara, H, Kodama, R, Kondo, T, Tanaka, KA, Tampo, M, Mima, K, 他5名
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Journal Title
PHYSICS OF PLASMAS 14
Pages: 040706
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Simulation and design study of cryogenic cone shell target for fast ignition FIR EX project2007
Author(s)
Nagatomo, H., Johzaki, T., Nakamura, T., Sakagami, H., Sunahara, A., Mima, K.
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Journal Title
Physics of Plasmas 14
Pages: 056303
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Polarization of Hea Radiation due to Anisotropy of Fast-Electron Transport in Ultraintense-Laser-Produced Plasmas2007
Author(s)
Kawamura, T., Kai, T., Koike, E, Nakazaki, S., Inubushi, Y., Nishimura H.
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Journal Title
PHYSICAL REVIEW LETTERS 99
Pages: 115003
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] On the behavior of ultraintense laser produced hot electrons in self-excited fields2007
Author(s)
Yabuuchi, T, Adumi, K, Habara, H, Kodama, R, Kondo, T, Tanaka, KA, Tampo, M, Mima, K, et al
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Journal Title
PHYSICS OF PLASMAS 14
Pages: 040706
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Simulation studies for core heating properties in FIREX-I2007
Author(s)
Johzaki, T., Nagatomo, H., Nakamura, T., Sakagami, H., Sunahara, A., Mima, K., Y. Nakao, Y.
Organizer
The fifth International Conference on Inertial Fusion Sciences and Applications
Place of Presentation
神戸
Year and Date
2007-09-14
Description
「研究成果報告書概要(和文)」より
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[Presentation] Simulation studies for core heating properties in FIREX-I2007
Author(s)
Johzaki, T., Nagatomo, H., Nakamura, T., Sakagami, H., Sunahara, A., Mima, K., Y. Nakao, Y.
Organizer
The fifth International Conference on Inertial Fusion Sciences and Applications
Place of Presentation
Kobe.
Year and Date
2007-09-14
Description
「研究成果報告書概要(欧文)」より
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