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Anomalous Stabilization of Hydrodynamic Instability Due to Nonlocal Energy Transport

Research Project

Project/Area Number 11480109
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field プラズマ理工学
Research InstitutionOsaka University

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)

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)
高部 英明  大阪大学, レーザー核融合研究センター, 教授 (20150352)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥14,800,000 (Direct Cost: ¥14,800,000)
Fiscal Year 2001: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2000: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1999: ¥5,800,000 (Direct Cost: ¥5,800,000)
KeywordsRayleigh-Taylor instability / Nonlocal energy transport / High spatial resolution x-ray imaging / Laser fusion / Superwoman / 流体力学的不安定性 / X線モアレ干渉
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".

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] T.Sakaiya, H.Azechi, M.Nakai et al.: "Ablative Rayleigh-Taylor lnstability at Short Wavelengths Observed with Moire Interlerometry"Physical Review Letters. Vol.88. 145003-1-145003-4 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Nishikino, H.Shiraga, N.Miyanaga et al.: "Imprint Reduction in a Plasma Layer Preformed with X-Ray Irradiation"Physics of Plasmas. Vol.9,No.4. 1381-1391 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Nakai, H.Azechi, N.Miyanaga, K.Shigemori et al.: "Single Spatial Mode Experiments on Initial Laser Imprint on Direct-Driven Planar Targets"Physics of Plasmas. (掲載受理). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Shigemori, H.Azechi, M.Nakai et al.: "Perturbation Transfer from Front to Rear Surface of Laser-Irradiated Targets"Physical Review E. (掲載受理). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] I.Golovkin, R.Mancini, S.Louis, Y.Ochi, K.Fujita, H.Nishimura, N.Miyanaga, H.Azechi: "Spectroscopic Determination of Dynamic Plasma Gradients in Implosion Cores"Physical Review Letters. Vol.88,No.4. 045002-1-045002-4 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Heya, H.Shiraga et al.: "Implosion experiments of gas-filled plastic-shell-targets with 1=1 drive nonuniformity at the Gekko-XII glass laser"Laser and Particle Beams. Vol.19. 267-284 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Nishikino, H.Shiraga, et al.: "Density Profile of the Ablating Plasma Produced by Soft X-Ray Irradiation"Review of Scientific Instruments. vol.72,No.1. 653-656 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Heya, S.Fujioka, H.Shiraga, M.Miyanaga: "Development of Wide-Field, Multi-Imaging X-Ray Streak Camera Technique with Increased Image-Sampling Arrays"Review of Scientific Instruments. Vol.72,No.1. 755-758 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Sakaiya, H. Azechi, M. Matsuoka, N. Izumi, M. Nakai, K. Shigemori, H. Shiraga, A. Sunahara, H. Takabe, T. Yamanaka: "Ablative Rayleigh-Taylor Instability at Short Wavelengths Observed with Moir Interferometry"Physical Review Letters. 88. 145003-1-4 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [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)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Nakai, H. Azechi, N. Miyanaga, K. Shigemori et al.: "Single Spatial Mode Experiments on Initial Laser Imprint on Direct-Driven Planar Targets"Physics of Plasmas. (in press) 2002.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Shigemori, H. Azechi, M. Nakai et al.: "Perturbation Transfer form Front to Rear Surface of Laser-Irradiated Targets"Physical Review E. (in press) 2002.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Shigemori, M. Nakai, H. Azechi, K. Nishihara, R. Ishizaki, T. Nagaya, H. Nagatomo, and K. Mima: "Feed-out of Rear Surface Perturbation due to Rarefaction Wave in Laser-Irradiated Targets"Physical Review Letters. 84, No.23. 5331 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [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)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] I. Golovkin, R. Mancini, S. Louis, Y. Ochi, K. Fujita, H. Nishimura, N. Miyanaga, H. Azechi: "Spectroscope Determination of Dynamic Plasma Gradients in Implosion Cores"Physical Review Letters. 88. 045002-1-4 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Nishikino, H. Shiraga, M. Matsumoto, S. Fujioka, K. Shigemori, M. Nakai, H. Azechi, N. Miyanaga, and T. Yamanaka: "Density Profile of the Ablating Plasma Produced by Soft X-Ray Irradiation"Review of Scientific Instruments. 72. 653-656 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Heya, S. Fujioka, H. Shiraga, N. Miyanaga, and T. Yamanaka: "Development of Wide-Field, Multi-Imaging X-Ray Streak Camera Technique with Increased Image-Sampling Arrays"Review of Scientific Instruments. 72. 755-758 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Sakaiya, H.Azechi, M.Nakai et al.: "Feed-out of Rear Surface Perturbation due to Rarefaction Waves in Laser-Irradiated Targets"Physical Review Letters. (掲載受理). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Nakai, H.Azechi, K.Shigemori et al.: "Experiments on Radiative Collapse in Laser-Produced Plasmas Relevant to Astrophysical Jets"Physics of Plasmas. (掲載受理). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Nishikino, H.Shiraga, N.Miyanaga et al.: "Imprint Reduction in a Plasma Layer Preformed with X-Ray Irradiation"Physics of Plasmas. (掲載受理). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Nakai, H.Azechi, N.Miyanaga, K.Shigemori et al.: "Single Spatial Mode Experiments on Initial Laser Imprint on Direct-Driven Planar Targets"Physics of Plasmas. (掲載受理). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Shigemori, H.Azechi, M.Nakai et al.: "Perturbation Transfer from Front to Rear Surface of Laser-Irradiated Targets"Physical Review E. (掲載受理). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] I.Golovkin, R.Mancini, S.Louis, Y.Ochi, K.Fujita, H.Nishimura, N.Miyanaga, H.Azechi: "Spectroscopic Determination of Dynamic Plasma Gradients in Implosion Cores"Physical Review Letters. Vol.88, No.4. 045002-1-045002-4 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Nishikino, H.Shiraga, et al.: "Density Profile of the Ablating Plasma Produced by Soft X-Ray Irradiation"Review of Scientific Instruments. Vol.72, No.1. 653-656 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Heya, S.Fujioka, H.Shiraga, M.Miyanaga: "Development of Wide-Field, Multi-Imaging X-Ray Streak Camera Technique with Increased Image-Sampling Arrays"Review of Scientific Instruments. Vol.72, No.1. 755-758 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] K.Shigemori et al.: "Feed-out of Rear Surface Perturbation due to Rarefaction Waves in Laser-Irradiated Targets"Physical Review Letters. Vol.84,No.23. 5331-5334 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Shigemori et al.: "Experiments on Radiative Collapse in Laser-Produced Plasmas Relevant to Astrophysical Jets"Physical Review E. Vol.62,No.6.. 8838-8841 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Azechi et al.: "Formation of Initial Perturbation of Rayleigh-Taylor Instability in Supernovae and Laser Irradiated Targets---Is There Any Similarity?"The Astrophysical Journal Supplement. Vol.217,No.2. (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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