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Basic research of pellet injector for inertial fusion

惯性聚变颗粒喷射器基础研究

基本信息

批准号：
07458115
负责人：
YAMANAKA Tatsuhiko
金额：
$ 2.88万
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：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07458115/
关键词：
Injector Inertial fusion Pellet Coil gun Linear motor Sabot Laser Magnetic

项目摘要

Basic technology necessary to develop a fuel pellet injection system for a future laser fusion reactor was investigated. The project is dictated to develop precise velocity control technology and trace technology for the injected pellet.In the future laser fusion reactor, fuel pellets consisting 6-mm-diameter capsule filled with deuterium and tritium are injected into the center at repetition rate of few IIz. Since the implosion efficiency strongly depends upon the irradiation uniformity, the fuel pellet must be exactly located at the firing position when it is irradiated by laser beams. Current understanding for the centering accuracy is less than 50 micrometer. Since the injection velocity of the pellet is about 300 m/s, this specification requires the detection system with 10 micro rad in direction and 0.1 micro second in the timing.Since the required injection velocity of 300 m/s is already demonstrated somewhere, we concentrated in improving the repeatability. For the first stem, influence of deviation in the initial position on the final injection velocity was investigated. We found that a deviation of 100 micrometer from the optimized position result in velocity deference of 10^6. We can say that the accuracy of initial pellet loading is not so serious for injection system.For the trace technology, we proposed a detection system consisting of three flat laser beams and three photo detectors. We found that the system can detect the passage of s real size pellet with accuracy of 10 ns in the timing and 10 micrometer in the position. There results indicate futuer trace system can be constructed by using one set for x, and y axis each and 3 sets of x-y units for Z (injection) axis.

研究了未来激光聚变反应堆燃料芯块喷射系统的基本技术。该项目的主要任务是发展精确的速度控制技术和跟踪技术，在未来的激光聚变反应堆中，燃料芯块由直径为6 mm的充满氘和氚的胶囊组成，以几个IIz的重复频率注入中心。由于内爆效率很大程度上取决于辐照的均匀性，因此在激光辐照时，燃料芯块必须精确地定位在点火位置。目前对定心精度的理解是小于50微米。由于弹丸的注入速度约为300 m/s，因此本规范要求检测系统的方向为10 μ rad，时间为0.1 μ s。由于所需的300 m/s的注入速度已经在某处得到证明，因此我们集中精力提高重复性。对于第一杆，研究了初始位置偏差对最终注射速度的影响。我们发现，与优化位置的100微米的偏差导致10^6的速度差。可以说，弹丸初始装填精度对注入系统来说并不重要。对于跟踪技术，提出了一种由三束平激光和三个光电探测器组成的检测系统。实验结果表明，该系统能够检测到真实的尺寸弹丸的通过，时间精度为10 ns，位置精度为10 μ m。结果表明，用x、y轴各一套，z轴用3套x-y单元，可以构成未来的示踪系统。