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Study of physics and practical applications of laser-driven in-tube accelerator

激光驱动管内加速器物理及实际应用研究

基本信息

批准号：
13852014
负责人：
SASOH Akihiro
金额：
$ 79.54万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (S)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2005
项目状态：
已结题

项目摘要

Basic and application studies were conducted on the laser-driven, in-tube accelerator which had been developed by the head investigator. The operation principle was experimentally validated in 4-m-high vertical launch experiment. The impulse generation mechanisms were experimentally and numerically studied by highlighting the interactions among shock waves, expansion waves and laser-generated plasma and accompanying fluid-dynamics instabilities. A scaling law of its propulsion performance was established. The impulse enhancement using laser ablation was experimentally demonstrated. Those are useful for practical applications. In this device, the momentum coupling coefficient, which is defined as the ratio of an impulse to a laser energy, can be tripled owing to a confinement effect and with appropriate setting of the working gas species and its fill pressure. The momentum coupling coefficient scales with the reciprocal of the speed of sound, which was experimentally validated using thr … More ee kinds of monoatomic gases, argon, krypton and xenon. The secondary effect of their ionization potential on the impulse was also obtained. The impulse performance is uniquely characterized using a dimensionless momentum coupling coefficient, the dimensional momentum coupling coefficient multiplied by the speed of sound, and a dimensionless parameter, the ratio of the fill pressure multiplied by an effective projectile volume to the laser energy. From the experimental and numerical analysis, it is concluded that the impulse performance can be optimized from the effective expansion volume of the laser plasma. In the laser-ablative performance experiment, polyacetal exhibited the best performance ; its impulse is sensitive to the ambient pressure. At an appropriate laser fluence, the impulse becomes highest at ambient pressures below 100 Pa. This favorable performance can be useful not only for improving the propulsive performance of the device but also for other various space applications including space debris deorbiting. Less

对首席研究员开发的激光驱动的管内加速器进行了基础和应用研究。在4 m高度垂直发射实验中验证了其工作原理。脉冲产生机制进行了实验和数值研究，突出冲击波，膨胀波和激光产生的等离子体和伴随的流体动力学不稳定性之间的相互作用。建立了其推进性能的定标律。实验证明了激光烧蚀增强脉冲的方法。这些对于实际应用是有用的。在该装置中，动量耦合系数（其被定义为脉冲与激光能量的比率）可以由于限制效应以及工作气体种类及其填充压力的适当设置而增加两倍。动量耦合系数与声速的倒数成比例，这一点用THR实验验证 ...更多信息 ee种单原子气体，氩，氪和氙。得到了它们的电离势对冲量的二次效应。使用无量纲动量耦合系数（量纲动量耦合系数乘以声速）和无量纲参数（填充压力乘以有效射弹体积与激光能量的比率）来唯一地表征脉冲性能。通过实验和数值分析，得出了可以从激光等离子体的有效膨胀体积来优化脉冲性能的结论。在激光烧蚀性能实验中，聚甲醛表现出最好的性能，其冲量对环境压力敏感。在适当的激光能量密度下，脉冲在低于100 Pa的环境压力下变得最高。这种良好的性能不仅可用于提高装置的推进性能，而且可用于其他各种空间应用，包括空间碎片离轨。少