Completing the Viability Demonstration of Direct-Drive IFE Target Engagement and Assessing Scalability to a Full-Scale Power Plant
Completing the Viability Demonstration of Direct-Drive IFE Target Engagement and Assessing Scalability to a Full-Scale Power Plant
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DOI：
10.1109/tps.2009.2037423
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发表时间：
2010-03-01
影响因子：
1.5
通讯作者：
Petzoldt, Ronald W.
中科院分区：
文献类型：
--
作者：
Carlson, Lane C.;Tillack, Mark S.;Petzoldt, Ronald W.
直接驱动惯性聚变能量靶成功内爆的一个重大挑战是多束激光以20微米量级的精度重复对准运动目标。增加难度的是，目标将以100m/S的速度通过可能干扰其轨迹的暗室环境。在高平均功率激光计划中，我们开发了一种能够满足惯性聚变发电厂目标的目标跟踪和交战系统。该系统由单独的轴向和横向目标探测技术和最终校正技术组成，该技术使用短脉冲激光在燃烧室中心前1-2ms询问目标的位置。然后，转向镜被引导到燃烧室中心与目标接合。在过去的几年里，我们构建并改进了一个以更低的速度和路径长度运行的综合桌面演示。2007年8月，使用模拟驱动波束对空中运动目标的初始交战速度为150微米均方根。从那时起，我们对导致整体接洽错误的所有误差源进行了全面的分析。通过专注于那些影响最大的个别部件误差并提高它们的精度，我们大幅减少了总体啮合误差。2008年8月，我们利用这种方法在空气中实现了42亩均方根，2009年3月，我们在真空中实现了34亩均方根。我们认为实现我们的目标所必需的最后要素是，必须在典型真空环境中接触轻型目标，并了解示范尺度误差到全面误差的可伸缩性。在这篇文章中，我们介绍了在识别和减少误差方面的最新改进，以及由此产生的交战数据，证明了直接驱动目标交战的可行性论证接近完成到20微米。
A significant challenge for the successful implosion of direct-drive inertial fusion energy targets is the repeated alignment of multiple laser beams on moving targets with accuracy on the order of 20 mu m. Adding to the difficulty, targets will be traveling up to 100 m/s through a chamber environment that may disturb their trajectories. In the High Average Power Laser program, we have developed a target tracking and engagement system that is capable of meeting the goals for an inertial fusion power plant. The system consists of separate axial and transverse target detection techniques and a final correction technique using a short-pulse laser to interrogate the target's position 1-2 ms before a chamber center. Steering mirrors are then directed to engage the target at the chamber center. Over the past few years, we have constructed and improved upon an integrated tabletop demonstration operating at reduced speeds and path lengths. In August 2007, initial engagement of moving targets in air using a simulated driver beam was 150-mu m rms. Since then, we have taken an encompassing look at all error sources that contribute to the overall engagement error. By focusing on those individual component errors that have the most influence and improving their accuracy, we have substantially reduced the overall engagement error. In August 2008, we had achieved an engagement of 42-mu m rms in air by using this approach, and in March 2009, 34-mu m rms in vacuum. The final elements, which we believe are necessary to meet our goal, necessitate engaging lightweight targets in a prototypic vacuum environment with an understanding of the scalability of demonstration-scale errors to full-scale errors. In this paper, we present the latest improvements from the identification and reduction of errors and the resulting engagement data demonstrating near completion of the viability demonstration of direct-drive target engagement to 20 mu m.