Heating efficiency evaluation with mimicking plasma conditions of integrated fast-ignition experiment
Heating efficiency evaluation with mimicking plasma conditions of integrated fast-ignition experiment
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DOI：
10.1103/physreve.91.063102
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发表时间：
2015-06-05
影响因子：
2.4
通讯作者：
Azechi, Hiroshi
中科院分区：
文献类型：
--
作者：
Fujioka, Shinsuke;Johzaki, Tomoyuki;Azechi, Hiroshi
对激光驱动惯性约束聚变快点火方案中加热激光与燃料芯的能量耦合效率进行了一系列实验研究。虽然效率是由各种复杂的物理决定的，从强烈的激光等离子体相互作用到高能量密度等离子体的性质和相对论电子束（REB）的传输，在这里我们通过将效率分解为三个可测量的参数来简化物理：（i）从激光到REB的能量转换比，（ii）REB与聚变燃料堆芯之间的碰撞概率，以及（iii）从REB沉积在燃料堆芯中的能量的分数。这三个参数的测量与新开发的实验平台，旨在模仿一个现实的综合快速点火实验的等离子体条件。实验结果表明，为了有效地加热燃料堆芯，必须抑制REB的高能尾部。
A series of experiments were carried out to evaluate the energy-coupling efficiency from heating laser to a fuel core in the fast-ignition scheme of laser-driven inertial confinement fusion. Although the efficiency is determined by a wide variety of complex physics, from intense laser plasma interactions to the properties of high-energy density plasmas and the transport of relativistic electron beams (REB), here we simplify the physics by breaking down the efficiency into three measurable parameters: (i) energy conversion ratio from laser to REB, (ii) probability of collision between the REB and the fusion fuel core, and (iii) fraction of energy deposited in the fuel core from the REB. These three parameters were measured with the newly developed experimental platform designed for mimicking the plasma conditions of a realistic integrated fast-ignition experiment. The experimental results indicate that the high-energy tail of REB must be suppressed to heat the fuel core efficiently.