2006 Fiscal Year Final Research Report Summary
Investigation of the basic processes for the development of the target required for the local heating of plasma.
| Project/Area Number |
17540476
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Plasma science
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
KAWACHI Tetsuya Japan Atomic Energy Agency, Senior Researcher, 量子ビーム応用研究部門, 研究副主幹 (40343941)
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| Co-Investigator(Kenkyū-buntansha) |
UTSUMI Takayuki Yamaguchi Tokyo university of Science, Faculty of Engineering, Professor, 工学部, 教授 (50360433)
SASAKI Akira Japan Atomic Energy Agency, Senior Researcher, 量子ビーム応用研究部門, 研究副主幹 (10215709)
HASEGAWA Noboru Japan Atomic Energy Agency, Researcher, 量子ビーム応用研究部門, 研究職 (50360409)
NISHIKINO Masaharu Japan Atomic Energy Agency, Researcher, 量子ビーム応用研究部門, 研究職 (70370450)
OCHI Yoshihiro Japan Atomic Energy Agency, Researcher, 量子ビーム応用研究部門, 研究職 (20370372)
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| Project Period (FY) |
2005 – 2006
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| Keywords | plasma physics / laser physics / x-ray laser / interferometer / hydro dynamics simulation |
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| Research Abstract |
The aim of this research project is development of target dedicated to the efficient heating of laser-produced plasma such as x-ray laser medium plasma. Consider that a flat target is irradiated by double pulses of laser light. The spatial profile of the electron density of the pre-formed plasma refracts the main heating laser pulse in the outward direction due to the density gradient ; therefore substantial amount of heating energy is not deposited in the localized small area but outer region, which leads to the ineffective heating of the plasma.
In order to overcome this difficulty, we propose the use of wedge-shape target, in which the electron density profile of the pre-formed plasma guides the main heating laser pulse to the inward of the wedge, therefore the heating energy is expected to be deposited in the localized small area. In 2005, the shape of the wedge target was designed by use of hydrodynamics simulation, and the target was irradiated by the CPA Ti : Sapphire laser in JAEA. The interferometer and backlighter using the probe beam was applied to the diagnostics of the pre-formed plasma, and we obtained the information of temporal evolution of the spatial profile of the electron density together with the optimum timing of the main heating pulse. In 2006, we have conducted the experiment using CPA Nd : glass laser in JAEA : under the optimum condition, the spatial profile of the continuum x-ray signal emitted from the wedge-shape target was measured : the result indicated that the total amount of signal of x-ray with the energy range of 0.8-1.5KeV is increased by virtually one-order of magnitude by employing the wedge-shape target compared with that of flat target.
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