Effects of pre-formed plasma inside a guiding cone in fast ignition scheme
Effects of pre-formed plasma inside a guiding cone in fast ignition scheme
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DOI：
10.1088/1742-6596/244/2/022079
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发表时间：
2010-08
期刊：
影响因子：
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通讯作者：
A. Sunahara;H. Cai;T. Johzaki;H. Nagatomo;K. Mima
中科院分区：
文献类型：
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作者：
A. Sunahara;H. Cai;T. Johzaki;H. Nagatomo;K. Mima
模拟了在快点火实验中预脉冲辐照锥壁引起的等离子体膨胀。我们的辐射流体动力学模拟显示的时间演化的预先形成的等离子体内的圆锥。在预脉冲开始时，锥轴附近的膨胀等离子体内的碰撞产生等离子体射流。在预脉冲后期，在锥尖附近形成了高于1.06 μm激光临界密度的大密度架，随后临界密度面远离锥尖内表面。我们的模拟给出了在大坂大学LFEX激光器的典型预脉冲条件下，对于45度开角锥，临界密度表面的大约80μm的位移。这种临界密度的移动可以减少加热激光与内爆核之间的能量耦合。
We simulated the plasma expansion of the cone wall due to the pre-pulse irradiation in fast-ignition experiments. Our radiation hydrodynamic simulations show the temporal evolution of the pre-formed plasma inside the cone. At the onset of the pre-pulse, collision within the expanding plasma near the cone axis generate a plasma jet. At the later stage of the pre-pulse the large density shelf above the critical density of 1.06 μm wavelength laser is formed near the tip inside the cone, and subsequently this critical density surface moves away from the inner surface of the cone tip. Our simulation gives roughly 80μm shift of the critical density surface under the typical pre-pulse condition of LFEX laser at Osaka University for 45 deg open angle cone. This shift of the critical density can reduce the energy coupling between the heating laser and the imploded core.