Anomalous Stabilization of Hydrodynamic Instability Due to Nonlocal Energy Transport

非局域能量传输引起的水动力不稳定性的反常稳定

• 批准号: 11480109
• 负责人: AZECHI Hiroshi
• 金额: $ 9.47万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11480109/
• 关键词: Rayleigh-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

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".

抑制流体动力不稳定性对于惯性融合能的发展至关重要。在启动该研究项目之前，我们发现观察到的雷利 - 泰勒不稳定性的增长率小于理论预测，归因于非局部电子能量传输。尽管抑制增长率本身是激光融合的“好消息”，但尚不清楚未来反应器等离子体是否会揭示出相同的效果。这项研究的目的是获得良好的理解来回答这个问题。为此，我们进行了以下三个实验。1。在短波长区域，生长速率的抑制最为明显。我们应用了创新的Moire干涉法，并成功地观察了短波长的不稳定性。增长率与考虑到非本地电子传输的预测非常吻合。2。非局部能量运输的直接证据至关重要。我们已经开发了X射线半肿瘤成像和菲涅耳相区域板成像，并成功测量了血浆密度。观察到的密度谱与非局部转运的预测更好地吻合3。必须测试目标未来反应堆目标的稳定性。我们已经开发了一种新的激光系统，该系统结合了所有现有的激光束，以便可以模拟未来目标的一小部分，并测量了雷利 - 泰勒不稳定性的增长率。我们的活性测量所有必要的数量以测试各种雷利 - 泰勒 - 泰勒不稳定性理论都有水果。尽管存在一些未解决的现象，但对25年以上的河流雷利 - 泰勒不稳定的理解正接近“游戏的终结”。

项目成果

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)

M.Nishikino、H.Shiraga 等人：“软 X 射线照射产生的烧蚀等离子体的密度分布”科学仪器评论。

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)

M. Nishikino、H. Shiraga、M. Matsumoto、S. Fujioka、K. Shigemori、M. Nakai、H. Azechi、N. Miyanaga 和 T. Yamanaka：“软 X 射线产生的烧蚀等离子体的密度分布

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)

K.Shigemori 等人：“激光照射目标中稀疏波引起的后表面扰动的反馈”物理评论快报。

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)

M.Nakai、H.Azechi、K.Shigemori 等人：“与天体物理射流相关的激光产生的等离子体中的辐射塌陷实验”（已接受出版）。

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)

H.Azechi 等人：“超新星和激光照射目标中瑞利-泰勒不稳定性的初始扰动的形成——有什么相似之处吗？”《天体物理学杂志增刊》。