Suppression of Hydrodynamic Instabilities by Controlling Vortices and Nonlocal Energy Transport

通过控制涡流和非局域能量传输抑制水动力不稳定性

• 批准号: 14208048
• 负责人: AZECHI Hiroshi
• 金额: $ 27.04万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14208048/
• 关键词: Rayleigh-Taylor instability; Nonlocal energy transport; Cocktail color irradiation; Double ablation; Laser fusion; 流体力学的不安定性; 二重アブレーション; カクテルカラー照射; 衝撃点火; 流体力学不安定性; 高空間分解X線イメージング; 渦

The concept of inertial fusion is that a spherical pellet made of fusion fuel is imploded by irradiating the surface with high power lasers, thereby assembling a high-density main fuel and a hot spark triggering thermonuclear ignition. Hydrodynamic instabilities such as the ablative Rayleigh-Taylor instability may potentially prevent the pellet from being compressed. Good understanding and suppression of the instability is, therefore, critically important for the success of inertial fusion.At the stage before starting this research project, we had found that the ablative Rayleigh-Taylor instability is significantly suppressed by nonlocal electron heat transport. The purpose of the present research is not just to accept this effect as God's breath, but to intentionally explore and establish various stabilization schemes.The schemes that we have proposed rely on nonlocal nature of thermal conduction, radiation, and convection. The present achievements are :1.The optimum laser wavelength … More is different for nonlocal transport and for high pressure generation necessary for implosions. We propose to enhance nonlocal effect by long wavelength laser light, whereas the high pressure is generated by short wavelength laser light. We named this scheme "Cocktail Color Irradiation" and proved its favorable effect (K. Otani, to be published in Phys. Plasmas).2.The x-ray drive of the target can also suppress the RT instability at the sacrifice of energy efficiency. We combine the suppression by x-ray radiation and the high efficient implosion by utilizing high-Z doped material as the fuel pellet itself. We named this scheme "double ablation" and proved its favorable effect (S.Fujioka, Phys.Rev.Lett. 04).3.Vortices suppress the instability by nonlocalizing the perturbation on the unstable surface. Only this subject is still under investigation.4.In addition to these activities, we have rigorously tested various theories of the RT instability by measuring all physical quantities appeared in the theoretical formula. As a result, we have found that long wavelength perturbations are suppressed by their nonlocality (H. Azechi, Phys.Rev.Lett. 07).Recalling 30 years activities, it is not too much to say that the understanding of the ablative Rayleigh-Taylor instability has almost reached to "the end of the game". Of course, scientific research is virtually; nonlocalization of perturbations themselves, for instance, will probably be a very interesting subject. But at the present progress of the good understanding, I believe that applying the suppression schemes on laser fusion itself is the more productive direction. Less

惯性聚变的概念是，用高功率激光照射由聚变燃料制成的球形小球的表面，使其内爆，从而组装成高密度的主燃料和热火花，触发热核点火。流体动力学不稳定性，如烧蚀瑞利-泰勒不稳定性，可能会潜在地阻止弹丸被压缩。因此，对不稳定性的理解和抑制对于惯性聚变的成功至关重要。在开始本研究项目之前的阶段，我们已经发现烧蚀瑞利-泰勒不稳定性被非局域电子热输运显著抑制。本研究的目的不仅仅是接受这种效应作为上帝的呼吸，而是有意识地探索和建立各种稳定方案。我们提出的方案依赖于热传导，辐射和对流的非局部性质。目前的研究成果是：1.最佳激光波长 ...更多信息 对于非局域输运和内爆所需的高压产生是不同的。我们建议用长波长激光增强非局域效应，而用短波长激光产生高压。我们将这种方案命名为“鸡尾酒色照射”，并证明了它的良好效果（K。2.靶的X射线驱动也可以在牺牲能量效率的情况下抑制RT不稳定性。我们结合了联合收割机的抑制x射线辐射和高效率的内爆，通过使用高Z掺杂材料作为燃料芯块本身。我们将该方案命名为“双烧蚀”，并证明了其良好的效果（S.Fujioka，Phys.Rev.Lett. 04).3.涡通过使不稳定面上的扰动非局部化来抑制不稳定性。4.除了这些活动外，我们还通过测量理论公式中出现的所有物理量，严格地检验了RT不稳定性的各种理论。结果，我们发现长波长扰动被它们的非定域性抑制了（H。Azechi，Phys.Rev.Lett. 07).回顾30年来的研究，可以说对烧蚀瑞利-泰勒不稳定性的认识已经接近“游戏的终点”。当然，科学研究实际上是;，例如，扰动本身的非定域化，可能会是一个非常有趣的课题。但在目前的良好理解的进展，我相信，将抑制方案应用于激光聚变本身是更富有成效的方向。少

项目成果

Towards realization of hyper-velocities for impact fusion ignition

实现超高速碰撞聚变点火

• 发表时间: 2005
• 期刊: Plasma Phys. Control. Fusion 47
• 作者: M.Murakami;H.Nagatomo;T.Sakaiya;H.Azechi;S.Fujioka;H.Shiraga;M.Nakai;K.Shigemori;H.Saito;S.Obenschain;M.Karasik;J.Gardner;J.Bates;D.Colombant;J.Weaver;Y.Aglitskiy
• 通讯作者: Y.Aglitskiy

Suppression of Rayleigh–Taylor instability due to radiative ablation in brominated plastic targets

• DOI: 10.1063/1.1705654
• 发表时间: 2004-04
• 期刊: Physics of Plasmas
• 影响因子: 2.2
• 作者: S. Fujioka;A. Sunahara;N. Ohnishi;Y. Tamari;K. Nishihara;H. Azechi;H. Shiraga;M. Nakai;K. Shigemori;T. Sakaiya;Motohiro Tanaka;K. Otani;Kazuki Okuno;T. Watari;Takeshi Yamada;M. Murakami;K. Nagai;T. Norimatsu;Y. Izawa;S. Nozaki;Yen-Wei Chen

Recent Progress of Experimental Study on Hydrodynamic Instabilities in Inertial Confinement Fusion Targets

惯性约束聚变靶体流体动力学不稳定性实验研究新进展

• 发表时间: 2005
• 期刊: J.Plasma Fusion Res 81 [special issue]
• 作者: Y.Hayashi;H.Tsumoto;M.Ikeda;R.Mizoguchi;Ken Fukuda.;土田勝義;K.Shigemori
• 通讯作者: K.Shigemori

Development of background reduced Fresnel phase zone plate

背景降低菲涅耳相位波带片的研制

• 发表时间: 2004
• 期刊: Rev. Sci. Instrum. 75
• 作者: Yohei Tamari;Hiroshi Azechi
• 通讯作者: Hiroshi Azechi

Towards Metallization of Carbon by Strong Shock Compression with Intense Laser

通过强激光强冲击压缩实现碳金属化

• 发表时间: 2006
• 期刊: Review of High Pressure Science Technology 16
• 作者: Sayanagi;K.;Nagao;T.;Watabe;I.;Ikurumi Yamaguchi;T.;Onishi;N.;Ichikita;T.;Takamura;N.;H.Takanaga;Kazuhiko Yamamoto;K.Shigemori
• 通讯作者: K.Shigemori