用于激光聚变的定向纳米天线
Directed Nano-antennas for Laser Fusion
AI总结：
提出利用纳米天线实现辐射主导的靶体积同时点火，避免机械不稳定性和膨胀问题，通过正交于激光方向的质子加速实现点火。
摘要：
为什么使用纳米天线进行聚变？用三句话概括：目前的激光诱导聚变方案使用极端机械冲击压缩来获得一个热点，然后点火。然而聚变燃烧的传播速度仍慢于膨胀速度，并且机械不稳定性也可能发展。在辐射主导的系统中使用纳米天线，可以在整个靶体积内实现同时点火，并且没有时间留给机械不稳定性。点火是通过沿纳米天线方向（与激光照射方向正交）加速的质子实现的。 目前的激光聚变方法基于极端且缓慢的机械压缩，在燃料靶丸表面使用烧蚀层以增加压缩并阻止激光电磁能量穿透进入靶内。这源于一个错误的假设[1]，即爆轰法向4-矢量的时间分量应为零，这一假设排除了快速甚至同时的、辐射主导的爆轰的可能性（这在夸克胶子等离子体的燃烧（或强子化）中是众所周知的）。
英文摘要：
Why do we use nano-antennas for fusion? In three sentences: The present laser induced fusion plans use extreme mechanical shock compression to get one hotspot and then ignition. Still fusion burning spreads slower than expansion, and mechanical instabilities may also develop. With nano-antennas in radiation dominated systems, simultaneous ignition can be achieved in the whole target volume and there is no time left for mechanical instabilities. Ignition is achieved with protons accelerated in the direction of the nanoantennas that are orthogonal to the direction of laser irradiation. Present laser fusion methods are based on extreme and slow mechanical compression with an ablator surface on the fuel target pellet to increase compression and eliminate penetration of laser electromagnetic energy into the target. This arises from a mistaken assumption, [1] that the detonation normal 4-vector should have vanishing time-like component, and this assumption eliminates the possibility to rapid or even simultaneous, radiation dominated detonations, (which are well known in the burning (or hadronization) of Quark Gluon Plasma).
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