Nernst effects study using dopant layer on magnetized target
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摘要: 双层磁化套筒靶在内层采用高原子序数（Z）材料，减少了因能斯特效应导致的磁通损失并降低点火要求，为磁化靶聚变提供了一种备选方案。然而，添加高Z材料也可能增加由于物质混合而产生的辐射损失。通过在金属套筒中使用带有塑料掺杂的锗作为高Z替代物，初步分析了磁场能斯特输运和物质混合对磁化套筒惯性聚变的影响。与单层套筒相比，双层套筒靶展示出温度和磁通的显著增加，从而使聚变产额提高了154%。将碳氢掺杂剂添加到最内层的锗中，模拟了物质混合对聚变产额的影响。研究结果表明，锗与CH混合，保持较低的混合比例，能够显著提高聚变产额。Abstract: The two-layer magnetized liner target offers an alternative approach to magnetized target fusion implosions by incorporating high atomic number (Z) materials in the innermost layer to mitigate magnetic flux losses caused by Nernst effects and reduce ignition requirements. However, the inclusion of high-Z materials may lead to increased radiation losses due to mixing. This preliminary research on magnetized liner inertial fusion (MagLIF) utilizes germanium (Ge) doped with CH as a high-Z substitute in the liner to isolate the effects of magnetic Nernst advection and mixing. Compared to one-layer targets, the two-layer configuration demonstrates significant increases in temperature and magnetic flux, resulting in a 154% improvement in fusion yield. Different concentrations of CH dopant are introduced into the inner layer of Ge, and the effects of CH concentrations on fusion yield are analyzed. The study shows that using low concentration CH-doped Ge as inner layer of liner can enhance fusion yield.
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Key words:
- two-layer liner /
- magnetized target fusion /
- Nernst effects /
- dopant /
- mixture
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图 2 双层磁化掺杂锗(5% CH)套筒靶中归一化的燃料离子温度、磁场以及密度沿半径的分布，实线考虑了能斯特对流，虚线未考虑
Figure 2. Normalized ion temperature, magnetic field and fuel density in the fuel of the two-layer magnetized Ge dopant (5% CH) liner target are plotted as functions of radius. The solid lines are results with the Nernst term included, while the dashed lines are without
图 3 内层中含有和不含95% Ge 掺杂层的内爆轨迹和驱动电流
Figure 3. Implosion diagram and driven current with and without the 95% Ge dopant in the inner layer
图 5 内层中含有和不含95% Ge掺杂层的磁通量
Figure 5. Magnetic flux in targets with and without 95% Ge inner layer
表 1 磁化双层套筒靶初始参数
Table 1. Initial parameters of magnetized two-layer liner target
fuel
radius/mmgermanium
thickness/mmberyllium
thickness/mmliner
length/mmpeak current
drive/MAaxial magnetic
field/Tpreheated
temperature/eVinitial preheat
time/ns2.7 0.002 0.538 10 30 15 250 75 
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