2001 Fiscal Year Final Research Report Summary
Anomalous Stabilization of Hydrodynamic Instability Due to Nonlocal Energy Transport
| Project/Area Number |
11480109
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
プラズマ理工学
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| Research Institution | Osaka University |
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Principal Investigator |
AZECHI Hiroshi Institute of Laser Engineering, Osaka University, Professor, レーザー核融合研究センター, 教授 (90135666)
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| Co-Investigator(Kenkyū-buntansha) |
SHIRAGA Hiroyuki Institute of Laser Engineering, Osaka University, Associate Professor, レーザー核融合研究センター, 助教授 (90183839)
MIYANAGA Noriaki Institute of Laser Engineering, Osaka University, Professor, レーザー核融合研究センター, 教授 (80135756)
NAKAI Mitsuo Institute of Laser Engineering, Osaka University, Research Associate, レーザー核融合研究センター, 助手 (70201663)
NISHIHARA Katsunobu Institute of Laser Engineering, Osaka University, Professor, レーザー核融合研究センター, 教授 (40107131)
NISHIMURA Hiroaki Institute of Laser Engineering, Osaka University, Professor, レーザー核融合研究センター, 助教授 (60135754)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Rayleigh-Taylor instability / Nonlocal energy transport / High spatial resolution x-ray imaging / Laser fusion / Superwoman |
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| Research Abstract |
Suppression of hydrodynamic instability is critically important for the development of, inertial fusion energy. Before starting this research project, we found that the observed growth rates of the Rayleigh-Taylor instability were smaller than the theoretical predictions, and attributed to the nonlocal electron energy transport.
Although the suppression of the growth rate itself is "good news" for laser fusion, it is unclear whether the same effect will be revealed in future reactor plasmas. The purpose of this research is to obtain good understanding to answer this question.
For this purpose, we have performed the following three experiments.
1. The suppression of growth rates is most pronounced in the short wavelength region. We have applied the innovated moire interferometry, and succeeded to observe the instability at short wavelengths. The growth rates have agreed well with the prediction that takes into account nonlocal electron transport.
2. Direct evidence of nonlocal energy transport is critical. We have developed x-ray penumbral imaging and Fresnel phase zone plate imaging, and succeeded to measure plasma density. The observed density profiles were in better agreement with the prediction of nonlocal transport.
3. Stability of targets for future reactors must be tested. We have developed a new laser system that combines all the existing laser beams so that a small portion of future target can be simulated, and measured the growth rates of Rayleigh-Taylor instability.
Our activity to measure all necessary quantities to test various Rayleigh-Taylor instability theories are bearing fruit. Although there are some unresolved phenomena, the understanding of the ablative Rayleigh-Taylor instability that have been a central issue in more than a quarter century is approaching to "the end of the game".
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[Publications] M. Nishikino, H. Shiraga, N. Miyanaga, N. Ohnishi, K. Shigemori, S. Fujioka, M. Nakai, H. Nishimura, H. Azechi, K. Mima, H. Takabe, S. Nakai, and T. Yamanaka: "Imprint Reduction in a Plasma Layer Preformed with X-Ray Irradiation Physics of Plasmas"Physics of Plasmas. 9. 1381 (2002)
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「研究成果報告書概要(欧文)」より
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[Publications] Manabu Heya, Hiroyuki Shiraga, Atsushi Sunahara, Mikio Nakasuji, Masaharu Nishikino, Hiroshi Honda, Kazuhisa Fujita, Nobuyuki Izumi, Noriaki Miyanaga, Hiroaki Nishimura, Hiroshi Azechi, Shuji Naruo, Hideaki Takabe, Tatsuhiko Yamanaka, and Kunioki Mima: "Implosion experiments of gas-filled plastic-shell-targets with ?=1 drive nonuniformity at the GEKKO-XII glass laser"Laser and Particle Beams. 19. 267-284 (2001)
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