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Interaction of relativistic intensity laser with a compressed plasma

相对论强度激光与压缩等离子体的相互作用

基本信息

批准号：
08680504
负责人：
TAKABE Hideaki
金额：
$ 0.64万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Drastic progress of laser technology have made it possible to produce a relativistic plasma. By use of this advance, the fast ignition scheme has been proposed in laser fusions. The purpose of this project is to study the laser plasma interactions in a compressed plasma and to clarify the physics of fast ignition.At first, we have studied the hole boring process to guide a ultra-short pulse to heat the edge of a compressed fuel. In one case, we have studied the relativistic interaction physics of laser and plasma by solving Vlasov-Maxwell equations with massive parallel computer. As the result, it is found that the self-focusing is not always expected, while the propagating laser beam breaks up due to the Weibel-type instability. This fact is also confirmed in the study with a particle code.Concerning the ignition and burn in the compressed core, we have clarified a scaling law of fusion gain of a given compressed core by use of 2-dimensional implosion code with alpha-particle transport code. Regardless whether ignition is triggered at the core center or edge, almost the same ignition condition has been obtained, It is also found that the target gain about 200 can be obtained in principle for the case of Mega Joule laser irradiation.Model experiments of astronomical phenomena can be designed with the intense laser lights. This topics is related to the present project and is briefly described in the report.

激光技术的巨大进步使得产生相对论性等离子体成为可能。利用这一进步，在激光聚变中提出了快速点火方案。该项目的目的是研究压缩等离子体中激光等离子体的相互作用，并阐明快速点火的物理原理。首先，我们研究了引导超短脉冲加热压缩燃料边缘的钻孔过程。在一个案例中，我们通过大型并行计算机求解Vlasov-Maxwell方程组研究了激光和等离子体的相对论相互作用物理。结果发现，自聚焦并不总是预期的，而传播的激光束由于韦贝尔型不稳定性而破裂。这一事实在粒子代码的研究中也得到了证实。关于压缩核心中的点火和燃烧，我们通过使用带有α粒子输运代码的二维内爆代码，阐明了给定压缩核心的聚变增益的标度规律。无论是在核心中心还是边缘触发点火，都获得了几乎相同的点火条件，还发现在兆焦耳激光照射的情况下，原则上可以获得200左右的目标增益。可以利用强激光设计天文现象的模型实验。该主题与当前项目相关，并在报告中进行了简要描述。